Coal Slurry Research Articles

Analysis of Different Types of Carbonaceous Reductants and Methods of Slag and Sludge Recovery at Converter Production

Recycling of metal-containing wastes with an iron content of more than 15%, such as slag and sludge from the gas cleaning of converter production, can be used to recover the metal. In order to study the reducing properties of coal sludge, coke breeze (coke), Shubarkol coal, a series of experimental melting of coal sludge briquettes with different contents of the listed carbon-containing materials was carried out. Sludge-coal briquettes were made from converter slag and sludge using hydrated lime as a binder. To determine the necessary parameters for the reduction of the iron-containing element, chemical and technical analyzes were carried out for ash content, moisture content and volatile matter. The choice of the optimal component composition of briquetted mixtures has established that the proportion of the reducing agent in the briquette should not exceed 20...25%, in order to avoid excess carbon, which binds into solid carbide compounds. The share of the reducing agent in the briquette was 15...18%. Chemical analysis of the resulting alloy and slag component pointed out the expediency of using Shubarkol coal as a carbonaceous reducing agent with high reactivity and electrical resistivity

Measurement method and experimental study on the intrusion resistance of coal slurry/wet pulverized coal

ABSTRACT Coal slurry is a semi-solid material formed by the water content of pulverized coal, which is a product of the coal production and transportation process and has viscous and wet characteristics, and is easy to cause blockage in the process of mechanized mining and transportation. To study the resistance law of the probe rod pressed into the quasi-static viscous particle medium at a uniform speed, coal dust and deionized water were mixed into different water content of coal slurry, and the resistance of the probe rod under pressure in different water content of coal slurry was measured. It is found that when the cohesion of coal slurry is small, the press-in process tends to be stable, and the intrusion resistance shows a linear-slowly increasing-suddenly increasing trend as the depth of pressure increases.

Citrate-enhanced leaching of arsenic from coal with simulated flue gas under UV irradiation

Simulated flue gas containing SO2 and O2 was passed into the coal slurry with added citrate in a 1 L stirred reactor to leach arsenic from coal. The effects of main factors on the leaching and oxidation of arsenic were investigated, and the enhanced reaction mechanism was analyzed. Results of experiments under dark and UV irradiation conditions showed that citrate and radicals generated under UV irradiation could effectively enhance the leaching of coal pyrite and arsenic. For 1 mM citrate- and UV-enhanced leaching process, the leaching ratio of coal arsenic at 150 min was 3.6 times higher than that of iron. The leaching ratios of both iron and arsenic increased with decreasing pH. Under UV irradiation most of As(III) leached in solution could be oxidized. Results of experiments with free radical quenchers demonstrated that HO• and SO4•- were the two main radicals oxidizing As(III) leached in solution. Based on FTIR and XPS characterization and leaching results, it was deduced that the added citrate could increase the total soluble iron concentration, inhibit both the re-adsorption of leached arsenic and the generation of passive Fe solid products, and enhance the formation of free radicals.

Coal Camp

Coal Camp Elizabeth Pope (bio) 1 In the crook of Slaughter Hollerleans a blue house in the branch where God grew a wife. She'd dangle along banksidedamp as a mermaid pooling the gloom of creek across her knuckles, coaled as a fishstrewn stagnant on embankment. Home was never a place she thought to leave. 2 She met her husband, blackened, splintered on Fireside—skunkdrunk with sun, wet parched neck, raw, crude, radiant as a cut. She witnessed this before—tarmac motes, oil rings rainbowed at coal tipple slurry. So much night without stars. Her waterface was a stomach chewing and churning, her lust—a pot rising to boil. His was the tarnished light, catching, raining the bottom scorch. 3 Their house was built upon what her husband brought back from War—a sound dark, quiet as the mine. A silence that ruined himas it sometimes does. She supposeda shade tree flowered inside him, [End Page 121] flowered until it gnarled, roots boreclaws into his sun, and he became the dark. 4 Her haunted husband was put to surveying the vein of the gorge. She thought it fitting for him to harvest buckets of remedy—coal as the lamp to quench his silence. He didn't pick at it like the rest of men mining for blackstar, shucking away, fingering gunpowder, searching for seedlingsdumped down there to grow. He didn't pick at it like a scab. He ran it, stuck dynamite in its side, and burst Julythe way kids poured vinegar and baking soda in a sealed jar and shook it, the way it shattered. He shook them when it shot dusty clouds on the ceilingthat never rained down. 5 She gathered the chicks born every April, homeless henspecking boot-mashed yolks. Put her ear to so close to clapboard it made her body drumlike closeline rattle. The house blackened, the creek, the stone, all the linen sheets turned ash. When her husband built this house, never did she fathom the sounds of shatter.Forests twisted arthritic into muddy scarecrow, into kites, into root stools. Into anything hands folded over. [End Page 122] 6 She recalls running downstream from that haunted sink.The bright blue morning floating down to baptize, steady as a stiltwalker. 7 Abandoned old house where everything once mattered.The dog-tired,sunk porchspokethe ancient omen: abandon all hope. Words she wore as a cotton dress unraveling thread. He wore the distant sun when evening swept over his water eyes,and his spirit was drunk enough to rise a shaky boat acrosshis stormface. 8 When her heirloom lilies bloom, she thinks of death and summerwild and bright like tigers, the names she labored,thirst—this ache to travel. [End Page 123] Elizabeth Pope elizabeth pope is a poet from an Appalachian coal-town in the mountains of Southeastern Kentucky. Her honors include an Emerging Artist Award from the Kentucky Arts Council, and her poetry appears in Euphony Journal, Rock River Review, The Fourth River, New Madrid, Appalachian Heritage, and elsewhere. Copyright © 2023 University of North Dakota

Sources and succession of microorganisms in industrial coal flotation system

The water system in a coal preparation plant harbors a variety of microorganisms, which may pose a great effect on coal recovery, however, usually be neglected. In this study, high-throughput sequencing and the growth of indigenous microorganisms in coal slurry containing organic reagents were conducted to trace the sources and succession of the microorganisms in a running plant, and the reason for microbial community succession was deeply explained. The microbiological analysis results found that the microorganisms in the coal slurry are assigned to 34 phyla and 98 genera, all source from the coal seam. Proteobacteria, Acidobacteria, Actinobacteria, and Crenachaeota are the dominant microorganisms at the phylum level, and the abundance of Proteobacteria, Bacteroidetes, and Nitrospirae in the flotation feeding decrease, and the abundance of GAL15 increase compared to the raw coal and mine water samples. Environmental factors are important reasons for microbial community succession. Organic reagents such as collectors and frothers commonly used in coal flotation processes can change the growth environment of microorganisms. The strain QX4, isolated from raw coal and identified as Bacillus sp. can accelerate growth in coal slurry containing organic reagents. Compared with raw coal, the content of chemical oxygen demand (COD) and dissolved oxygen (DO) in the flotation feeding increase by 340 mg/l and 5 mg/l respectively, which inhibit the metabolism of Nitrospirae, Bacteroides, Proteobacteria, and Actinobacteria, while improving the metabolism of GAL15, and change the microbial community and promote the microbial succession in the coal flotation system. Therefore, indigenous microorganisms from coal seam can grow and succeed in the coal flotation system, which has a potential effect on coal flotation efficiency.

Grouting mechanism and experimental study of goaf considering filtration effect.

The filtration effect significantly affects the gangue slurry velocity and concentration, making it difficult to evaluate the gangue slurry diffusion range. Based on the Darcy seepage law, a seepage theoretical calculation model is established considering the filtration time and space effect. And the "water-cement ratio change matrix" in the seepage process of coal gangue slurry is deduced, revealing the basic mechanism of the porous media filtration effect, and the water-cement ratio gradually increases in the seepage process of gangue slurry. The visual test platform for slurry diffusion in goaf was independently developed for testing. The active heating optical fiber method (AHFO) was used to monitor the flow and diffusion of coal gangue slurry in the collapse zone of goaf, and the gravity gradient and water cement ratio of slurry in goaf were measured. The law of particle sedimentation in the gangue slurry flow process under the filtration effect was revealed, and engineering verification was carried out. The results show that the average slope of the gangue slurry in the gangue accumulation is 6.34%, and the overall flow law of the gangue slurry in the goaf is the first longitudinal expansion and then transverse diffusion. The water-cement ratio near the grouting mouth is smaller than the initial water-cement ratio, the near-end water-cement ratio is smaller, and the far-end water-cement ratio is larger. During on-site filling, the accumulated grouting volume of a single hole is 700 m3, and the gangue slurry diffusion distance is greater than 45m, indicating that the gangue slurry has good fluidity.

Efficient Surrogate-Assisted Parameter Analysis for Coal-Supercritical Water Fluidized Bed Reactor with Adaptive Sampling

Supercritical water fluidized beds (SCWFBs) are promising and efficient reactors for the gasification of coal in supercritical water. The understanding and investigation of multi-phase flows as well as the gasification process usually rely on time-consuming experiments or numerical simulations, which prohibit fast and full exploration of the single and coupled effects of the operation and geometric parameters. To this end, this paper builds an efficient surrogate-assisted parameter analysis framework for the SCWFB reactor. Particularly, (1) it establishes a steady numerical simulation model of the SCWFB reactor for the subsequent analysis; and (2) it employs a Gaussian process surrogate modeling via efficient adaptive sampling to serve as an approximation for predicting the carbon conversion efficiency (CE) of the reactor. Based on this parameter analysis framework, this paper investigates the effects of five independent parameters (the mass flow rate of supercritical water, mass flow rate of the coal slurry, temperature of supercritical water, temperature of the outer wall and reactor length) and their interactions on the reaction performance in terms of the carbon conversion efficiency (CE). We found that the CE increases as a function of the temperature of supercritical water, the temperature of the outer wall and the reactor length; while it decreases as a function of the mass flow rate of supercritical water and the mass flow rate of the coal slurry. Additionally, the global sensitivity analysis demonstratesthat the influence of the temperature of the outer wall exerts a stronger effect than all the other factors on the CE, and the coupled interaction among parameters has a slight effect on the CE. This research provides useful guidance for scaled-up designs and optimization of the SCWFB reactor.

The effect of inorganic salt modification of sludge on the performance of sludge-coal water slurry

Coal water slurry (CWS) is a coal-based liquid fuel with the characteristics of high efficiency and low pollution. Municipal sludge, as a substantial solid waste, is of increasing attention due to the severe environmental pollution and difficult disposal. In this study, sludge is modified by inorganic salt solution and then used to prepare salt-modified sludge coal water slurry (SSCWS). The results showed that the sludge modified by KCl and AlCl3 can reduce the viscosity of CWS. While low concentration of CaCl2 tends to slightly increase the viscosity of CWS and higher concentration of CaCl2 can reduce the viscosity. It was found that among the three salts used in the experiment, the higher the cation valence state is, the easier and more the dispersant molecules are adsorbed on the surface of coal or sludge particles to improve the dispersion of coal and sludge particles, which was the main reason for improving the slurryability of SSCWS.

Contaminants from a former Croatian coal sludge dictate the structure of microbiota in the estuarine (Raša Bay) sediment and soil.

Croatian superhigh-organic-sulfur Raša coal had been mined for nearly 400 years. The release of hazardous trace elements (HTEs) and toxic organic pollutants (TOPs) into the local environment by coal mining, preparation, and combustion activities has resulted in pollution. In this study, the diversity and composition of microbial communities in estuarine sediment and soil samples as well as community function responses to the pollutants were investigated. The results showed that PAH degradation does occur following 60 years of natural attenuation, the location is still heavily polluted by polycyclic aromatic hydrocarbons (PAHs) and HTEs. Microbial analyses have shown that high concentrations of PAHs have reduced the diversity and abundance of microbial communities. The pollution exerted an adverse, long-term impact on the microbial community structure and function in the brackish aquatic ecosystem. Microorganisms associated with the degradation of PAHs and sulfur-containing compounds have been enriched although the diversity and abundance of the microbial community have reduced. Fungi which are believed to be the main PAH degrader may play an important role initially, but the activity remains lower thereafter. It is the high concentrations of coal-derived PAHs, rather than HTEs, that have reduced the diversity and abundance of microbial communities and shaped the structure of the local microbiota. This study could provide a basis for the monitoring and restoration of ecosystems impacted by coal mining activities considering the expected decommission of a large number of coal plants on a global scale in the coming years due to growing global climate change concerns.

Research on key parameters of pipeline transportation of waste rock treatment in underground residual space

As the key link of coal gangue slurry filling, slurry pipeline transportation is an important guarantee to realize the slurry mixing and safe transportation of gangue from solid powder. To realize the underground excavation gangue of the Huangling No. 2 coal mine without raising the ground, the slurry filling technology is proposed to transport the slurry made by gangue through the pipeline and fill it into the goaf. The phase composition and microstructure characteristics of underground excavation gangue in the Huangling No. 2 coal mine were analyzed by X-ray diffraction and an electron microscope scanning test, the slurry-forming properties of gangue powder with different particle sizes and gradations were studied, and the influence of gangue slurry concentration on its rheological properties was analyzed. The experimental results show that the gangue powder crushed using a cage crusher can be made into stable slurry when the particle grading size is the natural crushing gradation with the upper limit of particle size less than 3 mm. The viscosity of the slurry is positively correlated with the concentration. When the concentration is below 70%, the increase in viscosity is small, and when the concentration is above 70%, the increase in viscosity is significant. It is determined that the concentration of the Huangling No. 2 coal mine slurry is 70%. Based on the determination of slurry preparation parameters, the simulation analysis of slurry pipeline transportation was carried out, the influence of design velocity on the velocity distribution of the pipeline section and the variation law of slurry concentration was explored, and the design velocity of the project is determined to be 1.5 m/s. The engineering practice shows that the slurry preparation parameters are reasonable. The crushing and pulping of gangue under the ground and the safe transportation of a 6 km pipeline are realized, which provides a reference for similar engineering projects.

Concerns with Passive Anaerobic Bioreactors for Selenium Removal from Coal Slurry Liquid Wastes

Concerns with Passive Anaerobic Bioreactors for Selenium Removal from Coal Slurry Liquid Wastes

Reaction mechanism and mechanical properties of geopolymer based on kaolinitic coal tailings

Valorization of coal tailings as supplementary cementitious material is vital for green development, including their application as aluminosilicate in geopolymer materials. Coal tailings from southern Brazil were activated mechanically and thermally. This work analyzed the effect of calcium addition via Portland cement and flue gas desulfurization on the reaction mechanism of geopolymer using setting times and semi-adiabatic calorimetry. Additionally, un-calcined coal gangue was added to geopolymer cement to evaluate the effect of sulfur in the microstructure of geopolymer. The experimental results showed kaolinitic coal sludge was transformed into a metastable phase with higher reactivity, while X-ray pyrite reflection was observed for un-calcined coal gangue. The findings showed that calcium modified the reaction mechanism by accelerating the monomers' condensation and increasing the energy released, promoting the hardening of the geopolymer at 24 h. In addition, a solid matrix of geopolymer was developed compounded mainly by an amorphous inorganic polymer and C-A-S-H gel as a secondary phase. The thermodynamic simulation confirmed the addition of coal gangue reduced the pH of the pore solution and increased the content of SO42− and Fe2+. These results evidenced that partial oxidation of pyrite in an alkaline medium releases iron and sulfate ions and this process can lead to acidification of the pore solution resulting in internal degradation.

Prediction of the ash melting behavior and mineral phase transformation during the co-gasification of waste activated carbon and coal water slurry

Recycling waste activated carbon (WAC) through coal-water slurry (CWS) gasification to produce syngas resources with hydrogen as the main component is a new way to dispose of WAC. The ash fusion temperature, an essential parameter for selecting gasification raw materials, and the mineralogical composition determine the melting and crystallization behavior. In this paper, WAC and CWS were used as the raw materials for co-gasification. The melting properties and mineral phase transformation process of the coal-waste activated carbon-slurry (CWACS) gasification residue were predicted by thermodynamic equilibrium calculations and then experimentally verified. The results showed that the gasification residue yield of CWACS2 was significantly lower than that of CWACS1 due to the different ash contents of WAC in the feedstock. When the gasification temperature was increased to 1200 °C, the gasification residue of the sample melted and adhered to the walls of the porcelain boat. CWACS1 showed ash fusion temperature characteristics related to WAC1, while the ash fusion temperature characteristics of CWACS2 were nearly similar to those of CWS. The liquid phase generation rate of CWACS1 during the ash softening and deformation stages was much faster than that of CWS, while CWACS2 showed more changes in its liquid phase generation rate. Since various types of sodium-containing silicates dominated the minerals in the gasification residue of WAC2, the gasification residue of CWACS2 contained significantly more nepheline than CWS. Clinopyroxene was the main mineral in the gasification residue of CWACS1, and nepheline precipitated in the gasification residue of CWACS2. The mineralogical composition determined by XRD verified the simulation results of thermodynamic equilibrium.

Insights into the interaction of polycarboxylate with coal and kaolinite and their application in flotation

Kaolinite-rich coal slurries suffer from a low yield and high ash content owing to the easy mudification of kaolinite in water during flotation. This study investigates the efficient recycling of a kaolinite-rich coal slurry using sodium polycarboxylate flotation pretreatment. The differences in the mechanism of action of sodium polycarboxylate on coal and kaolinite were investigated using high-sensitivity microelectromechanical balancer (DCAT), Fourier infrared spectroscopy (FTIR), and scanning electron microscope (SEM). The results show that sodium polycarboxylate reduces the adhesion of the coal slurry and increases the adhesion of kaolinite. Sodium polycarboxylate can cover the hydrophilic groups of –OH by binding to the hydroxyl groups on the coal surface at multiple points via the polyhydroxy structure on the molecular chain. Covering the hydrophobic potential of kaolinite increases the percentages of hydrophilic groups such as Si-O and OH in FTIR. The above findings help to elucidate the separation mechanism of sodium polycarboxylate on carbon ash and improve the flotation separation effect. The optimum dosage of sodium polycarboxylate is 4 kg/t, kerosene, and 2-octanol are 10 kg/t and 12 kg/t, respectively. The yield of clean coal is 70.43 %, ash content of clean coal is 12.62 %, which increases the yield of clean coal by 40.89 % and decreases the ash content of clean coal by 8.56 % compared to the optimum dosage of froth flotation.

Application of spiral separation technology in coal sludge processing

The purpose of the study is to analyze the current state of the problem concerning the concentration technology of wash house coal sludge, comparison of the results of sludge dump coal processing on various types of processing equipment as well as formulation of recommendations for spiral separation method application for coal sludge enrichment. The main research methods include generalization and analysis of scientific and technical information, study of the results of technological tests on spiral separation. The problem of sludge concentration is relevant due to the increase in the content of fine classes in mined coal and, consequently, in coal sludge. In real practice most of the sludge is fuel for energy. Having analyzed the experimental part of the research, the authors established the efficiency of coal and rock fraction separation using the technology of coal sludge spiral separation. The need for preliminary classification of the source material before spiral separation is determined. It is found out that spiral sludge separators have a number of technological advantages as compared to spiral mineral separators, due to a wider range of enriched material fineness. The analysis of the performed tests made it possible to establish the application prospects of the spiral separation technology in coal sludge processing. The recommendations are given on the use of spiral separators manufactured by the Research and Production Company Spirit, LLC for the enrichment of sludge products including tailings, dump sludge of the work site of the Wash House of the Branch Open Pit Cheremkhovugol of Vostsibugol Company, LLC.

Overview of coal sludge gravity concentration technologies

The purpose of the study is to collect data and analyze modern development trends of gravity concentration technologies and equipment for coal sludge enrichment. Conducted generalization and analysis of scientific and technical information allowed to state that some attempts have been made recently to enrich coal slimes using mainly gravity concentration methods. Each of these methods involves a number of processes based on general physical and physicochemical properties serving the criteria for material separation as well as on the differently applied additional separating forces and machinery and apparatus designs. The latter include heavy-media cyclones, spiral separators, hydrosizers, concentration tables and wash boxes. The author considers the operation principle of the listed gravity equipment, demonstrates the advantages and disadvantages of each of the apparatuses. The data given indicate that, modern gravity equipment used for coal sludge enrichment features satisfactory indicators of the average probable deviation. To identify the rational topology of concentration diagrams for a particular object, the most optimal type of gravity concentration equipment or its combination is selected depending on the characteristics of the material composition. The analysis of data has shown that the most promising, highly efficient, effective, environmentally friendly and resource-saving gravity concentration method is spiral separation.

Segmentation algorithm of coal slurry foam with double-point directional extension based on the improved FCM clustering algorithm

In flotation production, the visual surface information of the flotation foam reflects the flotation effects, which are closely related to the flotation conditions and directly reflect the degree of mineralization of the foam layer. In this study, it was proposed a novel and efficient segmentation algorithm to extract the edge information of slime bubbles, as the boundaries are typically blurred and difficult to segment, due to the slime bubbles sticking to each other in the slime flotation foam image. First, the improved clustering algorithm and image morphology operation were used to extract the edges of the foam spots. Second, the image morphological operations were used as a starting point to look around the foam edge points. The pseudo-edge points were then removed using a region and spatial removal algorithm. Finally, the foam edges were extracted using the double-point directed expansion algorithm. A new criterion was proposed for segmentation effect determination based on the particularity of the segmented object. The feasibility and effectiveness of the foam segmentation method were investigated by comparative experiments. The experimental results showed that the proposed algorithm could obtain the foam surface properties more accurately and provide effective guidance for flotation production.

Slagging Characteristics of a Steam Boiler Furnace with Flare Combustion of Solid Fuel When Switching to Composite Slurry Fuel

Two interconnected mathematical models have been developed to describe slagging of a steam boiler furnace at the macro and micro levels. The macro-level model is implemented in Ansys Fluent. Using the fuel characteristics and temperature in the furnace, this model can predict the characteristics of ash formation on heat exchanger tubes when the melting temperature of the mineral part of solid fossil fuel is exceeded. The obtained values of slagging rates are used as initial data in the software implementation of the original Matlab microlevel model. Under conditions of dynamic change in the thickness of the slag layer, this model can evaluate the heat transfer characteristics in the hot gas/slag layer/tube wall/water coolant system. The results showed that switching a coal-fired boiler from a solid fossil fuel to a fuel slurry will improve stability and uninterrupted boiler operation due to a lower slagging rate. The combustion of coal water slurries with petrochemicals compared with coal–water fuel is characterized by higher maximum temperatures in the furnace (13–38% higher) and a lower average growth rate of slag deposits (5% lower), which reduces losses during heat transfer from flue gases to water coolant by 2%.

Describing the adsorption of PAM on coal/kaolinite surface in aquatic by combining experiments and MD simulation

Hydration is an important factor influencing the adsorption of reagent molecules at the mineral interface. Understanding the micro-scale characteristics of hydration and the molecular adsorption at the interface is fundamental to improving the effectiveness of solid–liquid separation. In this paper, the flocculation processes of coal sludge in water and in kaolinite solutions were investigated, and the surface properties of the settling materials were analysed using Scanning Electron Microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that as the concentration of polyacrylamide (PAM) increased, the flocculation effect showed a trend of first increasing and then decreasing. The kaolinite particles covered the coal surface, reducing the exposed area of the coal and the amount of PAM molecules adsorbed. Under the same conditions, the settling time of particles in kaolinite solutions is 60% longer than that in water. Further, molecular dynamics (MD) simulation was used to study the distribution of water molecules on the surface of coal and kaolinite, and the micro-scale configurations of PAM at the coal-water and kaolinite-water interfaces were analysed. The results showed that the coal surface was weakly hydrated, and PAM molecules can replace some of the water molecules near the coal surface. Kaolinite surface was strongly hydrated and the maximum density of the hydration layer is close to that of the kaolinite. PAM cannot cross the hydration layer with three layers of water molecules at the aluminium-oxygen octahedra (001) surface of kaolinite. However, there was only one layer of water molecules between PAM and silicon-oxygen tetrahedra (00–1) surface. When the kaolinite covered the coal surface, it was difficult for the PAM to replace the water at the surface, the 00–1 surface was the key dissociation surface to promote flocculation. This study illustrated microscopic insights into the effect of mineral hydration on the adsorption of flocculant molecules and may enrich the theory of mineral flocculation and sedimentation.

Study on Dispersion and Mixing Mechanism of Coal Slime Particles in Jet Mixing Flow Field

The jet flow field is characterized by the dispersion and mixing of multiphase flow, which is widely used in the field of coal slime flotation. In this paper, the behavior of coal slime surface modification, the behavior of material suspension and the effect of different jet fluids on coal slurry blending were studied. Based on the action mechanism of the jet flow field, a jet device suitable for coal slime graded mixing was proposed, and the mixing effect of the jet device was tested. The results show that the jet flow field has strong effects on material dissociation and dispersion, and the mixing effect of a single jet is equivalent to that of the laser particle size analyzer’s own agitation device after stirring for 2.5 min at 500 r/min speed. The SEM test of material surface morphology and the changes of Al and Si elements measured by EDS show that the jet flow field can effectively remove the fine mud wrapped on the surface of coal particles. The precondition of material suspension is to have the just-suspended capacity. The critical jet velocity of coal slime suspension is in the range of 6 m/s~9 m/s. The mixing ability of the jet stream has certain limitations. The increase or decrease of the jet height will cause the decrease of the suspension percentage of sampling points in the tank. The gas jet mode can promote the reagent acting on the surface of the bubble liquid film to form oil bubbles, which is more suitable for hydrophobic mineral flotation. The optimal speed of the gas jet is 0.86 m/s, and the shortest cycle period is 1.0 T (T is one material cycle period). The flotation perfection index of 0.5–0.25 mm and less than 0.075 mm coal slime increased by 2.67% and 26.78%, respectively, indicating that the overall idea of the jet mixing device proposed based on the experimental conclusion is feasible.