Hydrophobicity Of Coal Research Articles

Effect of the interaction time of CO2–H2O on the alterations of coal pore morphologies and water migration during wetting

CO2 geosequestration requires coal property examination for long-term storage sustainability. This study explores pore morphologies and water kinetic during wetting under interactions. Results showed that the CO2–H2O interaction induced intricate modifications in the coal pore architecture over time, causing a decrease in surface roughness and an increase in hydrophobicity of coal after long-term (10 days) and short-term (5 days) treatment. By setting a water intake, capillary force drives the transformation of free water to capillary water and adsorbed water. The adsorption kinetics of coal to water follows the linear driving force (LDF) mass transfer rate law, provided a good agreement with experimental data, validating its applicability to the studied system within the long time limits. As the reaction duration increased, the rate constant increased while the equilibrium adsorption capacity decreased. The modified Wenzel model of hydrophilic surface is proposed to interpret the temporal alterations, showing that untreated coal has substantial contact points on the rough surface, resulting in a smaller apparent contact area than the real contact area, hindering water retention and displaying enhanced wettability. The rule applied hydrophilic surface of both natural wettability adjusted by supercritical carbon dioxide (ScCO2).

Performance Comparison of Waste Cooking Oil on Coal Slime Flotation with Sunflower Oil and Gas Oil

This study explores the potential use of waste cooking sunflower oil (WSO) as an eco-friendly collector for coal slime flotation. WSO and coal slime are both wastes and are hazardous to human health and the environment, if not disposed of properly. In this study, co-disposal of the two wastes was investigated; a gas oil (petroleum derived oil) and crude sunflower oil (CSO) were used for collector efficiency comparisons. This study also presents a green, low-cost and environmentally friendly alternative. Kinetic flotation tests were carried out to study the flotation selectivity, flammability and combustible recovery. Contact angle measurements were performed with 3 different oils (CSO, WSO and gas oil) by sessile drop technique to determine the hydrophobicity and surface properties of coal. Fourier-transform infrared (FTIR) spectroscopy was utilized to analyze the chemical composition of both waste oil and coal samples. 
 Keywords: Sunflower oil, waste cooking oil, gas oil, coal slime, flotation

Analyzing the flotation kinetics of long-flame coal slurry using water-soluble emulsified collector mixtures

This article investigates the variations in flotation responses of long-flame coal using emulsified collector mixtures, utilizing various flotation kinetic (FK) models for analysis. The fitting process was carried out using the Origin software. The Fourier transform infrared spectroscopy (FTIR) results indicated that as the number of adjacent H atoms increased, the absorption peak on the surface of long-flame coal, processed by various emulsified collector mixtures, gradually shifted towards short-wave numbers. Moreover, the X-ray photoelectron spectroscopy (XPS) results suggested that COC/COH groups on the coal surface could form hydrogen bonds with oxygen-containing functional groups (OCFGs) in the surfactant molecular structure. Furthermore, the hydrophobic groups of the benzene ring in 4-dodecyl phenol (4-DDP) could adsorb onto the coal surfaces through π-π bonds, enhancing the surface hydrophobicity of long-flame coal. Moreover, the flotation performance of long-flame coal was significantly improved using the emulsified mixture of kerosene and 4-DDP, achieving a peak recovery of 39.86 %. The second-order model with a rectangular distribution of floatability led to an excellent fitting to the flotation process of long-flame coal when employing the emulsified mixtures.

Preliminary Study on the Surface Modification of Lignite and Bioflotation by White-Rot Fungi Hypocrea lixii AH

The efficient utilization of lignite is a crucial area of research for the sustainable management of existing coal resources. One potential technique for cost-effective and environmentally friendly coal processing is the application of microbes or their derivatives to modify the surface of lignite for bioflotation. However, the precise process of surface modification between microbes and coal remains largely unknown. In this study, we focused on the use of a white-rot fungus called Hypocrea lixii AH and its various components, including spores, hyphae, extracellular polymer substances (EPSs), and culture solution, as biosurfactants for lignite modification. By employing techniques such as zeta potential analysis, induction time measurement, contact angle measurement, and Fourier infrared spectroscopy, we investigated the changes in the surface properties of raw and modified lignite. Furthermore, we conducted a preliminary bioflotation test using biosurfactants as collectors in order to explore the potential application of fungal modification in this context. Our results revealed that all biosurfactants were effective in improving the surface properties of lignite, with the EPS demonstrating the most prominent effect, followed by the culture solution, hyphae, and spores. The zeta potential and induction time of the modified lignite decreased, indicating enhanced hydrophilicity, while the contact angle exhibited a slight increase, suggesting a minor increase in hydrophobicity. Analysis of the Fourier infrared spectra indicated that EPS treatment resulted in the highest abundance of functional groups, including carboxyl, hydroxyl, and amidogen groups. Although fungal cells were found to improve the hydrophobicity of coal, they did not exhibit a significant effect on the flotation of lignite. Nonetheless, our findings suggest that fungal cells and their derivatives have the potential to remove or transform minerals present in lignite, particularly those containing sulfur. While they may not serve as effective bio-collectors in microflotation, their capability in mineral alteration makes them valuable candidates for lignite processing with a focus on mineral reduction.

Effect of side chain functional groups of ionic liquids on improving wettability of coal: Simulation and experimental discussion

It is wise to investigate the influence of ionic liquids (ILs) on reducing hydrophobicity and dust pollution of coal from the perspective of side chain groups. In this study, two ILs ([Emim][Cl] and [HOEmim][Cl]), were selected and applied to bituminous coal. The density functional theory results showed that [HOEmim][Cl] containing the –OH group had an energy gap of 5.2895 eV, which was lower than the 5.3873 eV of [Emim][Cl] containing only the -CH3 group. A higher chemical activity of [HOEmim][Cl] was demonstrated due to the presence of the –OH group. A molecular dynamics-based contact angle system was constructed to investigate the wetting properties of coal samples treated with different ILs at the molecular level. The simulation results indicated that, compared to untreated coal, [HOEmim][Cl] exhibited a greater ability than [Emim][Cl] to improve the wetting properties of coal. Contact angle experiments demonstrated that treatment with [Emim][Cl] and [HOEmim][Cl] resulted in a decrease in contact angle by 22.67° and 25.04°, respectively, compared to deionized water, providing validation for the accuracy of molecular simulations. Lastly, the structural changes of coal samples induced by different ILs were observed by FITR, which explained the differences in wetting effects.

Synergistically effective flotation enrichment of vitrinite by Na removal for high-Na high-inertinite low-rank Zhundong coal

The highly effectively removing Na and enriching vitrinite for high-Na high-inertinite low-rank Zhundong coal is of great significance for its efficient and clean utilization. The effect of Na removal by low concentration HCl and AcOH on vitrinite enrichment before and during the flotation process of Zhundong coal are investigated. The vitrinite content in raw coal is only 48.67%, it can be increased to 61.85% and the yield of clean coal is only 26.44% by flotation for raw coal. However, if Na is nearly fully removed by HCl and AcOH before flotation, the vitrinite content can reach as high as 70.22% and the yield of clean coal can be significantly increased to 39.77% for AcOH-treated coal. The comprehensive efficiency is significantly improved to 57.38% from 33.60% for raw coal. When directly adding low concentration AcOH and HCl during flotation process of raw coal, the flotation effects are nearly the same to those of the above Na-removed coals in advance. The results clearly indicate that the effective removal of organic Na on surface and in macropores of coal plays a decisive role in synergistically enriching vitrinite by flotation. Further studies on vitrinite-rich coal (VC) and inertinite-rich coal (IC) and their Na-removed samples show the improvement of flotation effect can be attributed to the effective adjustment of the surface properties of Zhundong coal accompanying the Na removal, which not only improves the hydrophobicity of coal, but also promotes the hydrogen bonding interactions between collector and coal, especially vitrinite.

Study on the mechanism of adsorption and hydrophobic modification of glycerol monooleate/kerosene mixed collector on low-rank coal surface

A new collector (GK) consisting of GMO (glycerol monooleate)/kerosene was developed to address the problem that low-rank coal is difficult to be recovered by flotation with conventional non-polar oil collector. The flotation test proved that GK collector has excellent flotation performance for low-rank coal (combustible recovery rate close to 90 % while the ash content of clean coal is about 6 %). The contact angle, infiltration time, wetting heat and XPS analysis demonstrated that GK collector can significantly improve the hydrophobicity of low-rank coal, resulting in a great improvement of flotation efficiency. Molecular dynamics simulation shows that the hydrophilic head of GMO molecules can adsorb with low-rank coal directly through hydrogen bonding or indirectly through water bridges. The presence of GMO molecules in GK collector can increase the overall interaction strength of collector oil droplet with low-rank coal surface by more than half. A schematic diagram of collector adsorption on the surface of low-rank coal is drawn, which gives a complete overview of the stacking and hydrogen bonding connection modes at the molecular level of low-rank coal, water, GMO and kerosene adsorbed at the interface. The adsorption mechanism of this mixed collector on the surface of low-rank coal was clarified.

Changes in Surface Hydrophobicity of Coal Particles and the Formation of Coarse Particle–Bubble Clusters in the Process of High-Intensity Conditioning

The mechanism of high-intensity conditioning (HIC) has not been thoroughly revealed, and therefore this work investigates the effect of HIC on the surface hydrophobicity of coal with different particle sizes and the possible formation of particle–bubble clusters. The results show that different HIC conditions are required for coarse and fine particles. Coarse particles (+75 μm) require a higher turbulence intensity to increase collector dispersion, thereby increasing the adsorption of the collector. Fine particles (−75 μm) require a lower turbulence intensity to reduce the desorption of the collector. In this study, the optimum HIC conditions for coarse and fine particles are “2200 rpm + 1 min” and “1300 rpm + 1 min”, respectively. Interestingly, it seems that the adsorption capacity between fine particles and the collector is weaker than that for coarse particles. A non-enclosed HIC system produces up to 1.78 × 104/g bubbles in coarse particle–bubble clusters, and the mean bubble diameter is approximately 87 μm. The cluster achieves pre-mineralization and increases the apparent particle size, which is expected to improve flotation.

Enhancing Flotation Performance of Low-Rank Coal Using Environment-Friendly Vegetable Oil

Flotation is widely used for low-rank coal upgrading, although it is always inefficient due to its rough surface morphology and rich oxygen-containing functional groups. In this study, the environment-friendly vegetable oil 1030# was used to enhance the flotation performance of low-rank coal. The mechanism of 1030# enhancing the flotation of low-rank coal was revealed through surface property analysis of coal particles and bubble–particle adhesion tests. The flotation results showed that the flotation yield of low-rank coal increased with the increase in the collector dosage, and the flotation yield of 1030# as a collector is obviously higher than that of diesel. Scanning electron microscopy (SEM) and chromatography–mass spectrometry (GC-MS) were used to analyze the surface morphology of coal particles and components of the reagent. The SEM results showed that the surface of low-rank coal is loose and contains a large number of pores and cracks, which is not conducive to the spreading of chemicals on the coal surface and the mineralization of bubbles and particles. GC-MS results showed that 1030# mainly contained methyl oleate with more unsaturated double bonds than diesel. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to analyze the surface functional groups of the low-rank coal before and after reagent treatment. The results of FTIR and XPS showed that the coal surface of low-rank coal before reagent treatment contained a large number of oxygen-containing functional groups with poor surface hydrophobicity, while the surface of low-rank coal after reagent treatment had reduced oxygen-containing functional groups and increased hydrophobicity. The contact angle of the low-rank coal surface also showed the same variation trend as the FTIR and XPS results. The adhesion force between the bubble and coal surface in different collector solutions was measured. The maximum adhesion between the bubble and coal surface increased with the increase in the collector, and the maximum adhesion force with 1030# treatment was higher than that of diesel. This indicated that 1030# with a large number of polar components is more easily spread on the surface of low-rank coal, thus improving the hydrophobicity of low-rank coal.

A novel method for the desulfurization of medium–high sulfur coking coal

The presence of sulfur affects the clean utilization of coking coal. Inorganic sulfur in coal, which exists mainly in the form of pyrite, inherently pollutes clean coal during flotation, while organic sulfur, on the other hand, can only be effectively removed by chemical means. Here, the combined methods of flotation and oxidation were adopted for desulfurization, and the desulfurization mechanisms were analyzed via XPS (X-ray photoelectron spectrometer), SEM (Scanning electron microscopy), MD (Molecular Dynamics), etc. Results showed that the removal of inorganic sulfur was preferred compared to the removal of organic sulfur. The sulfur and ash contents in coal were reduced from 2.55% and 46.16% to 1.33% and 13.41%, respectively, via flotation-oxidation (FO) method. During the oxidation-flotation (OF) method, however, Fe2O3 was observed to form on the surface of pyrite, while the content of oxygen-containing functional groups, adsorption capacity of water molecules and hydrophilicity were observed to increase. MD simulation was in agreement with experimental results, in which the diffusion coefficient of water molecules on the surface of oxidized coal was found to be lower than that of raw coal. As such, the oxidation process reduced the hydrophobicity of coal, resulting in a lower recovery of the products obtained via OF as compared to FO method.

Enhanced Flotation Separation of Low-Rank Coal with a Mixed Collector: Experimental and Molecular Dynamics Simulation Study.

The efficient flotation separation of low-rank coal is still a difficult problem. The development of a collector is the key to solve the problem. In this study, a kind of mixed collector scheme with a practical value is proposed. The effects of the single collector dodecane (D) and methyl oleate (MO) and mixed collector D–didodecyl dimethyl ammonium bromide (DDAB) and MO–DDAB on flotation separation of low-rank coal were investigated. The flotation test results show that when the molar ratios of the mixed collector D–DDAB and MO–DDAB are 9:1 and the flotation time is 4 min, the cumulative combustible recovery of low-rank coal flotation is 71.49 and 76.73%, respectively, and the cleaned coal ash is 15.26 and 13.03%, respectively. The mixed collector significantly improves the flotation effect of low-rank coal compared with the single collector. According to the analysis results of the contact angle, wetting heat, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, the hydrophobicity of the low-rank coal surface is enhanced under the action of the mixed collector, and the adsorption between the mixed collector and coal surface is stronger. In addition, molecular dynamics (MD) simulation results show that compared with D or MO, DDAB tends to adsorb on the surface of low-rank coal, and the diffusion coefficients of water molecules on the surface of coal increase. The mixed collector first repels water molecules through its double hydrophobic carbon chain to weaken the binding of the coal surface to water molecules and then uses D or MO to further repel water molecules, thus effectively enhancing the surface hydrophobicity of low-rank coal.

Experimental study on prevention of spontaneous combustion of coal by ionic surfactant solution injection in coal seam

The inhibitor liquid used in the fire-extinguishing technology for preventing spontaneous coal combustion is difficult to inject due to the hydrophobicity of coal. To improve the injection effect and enhance the inhibitory properties, a surfactant (SDS) is added to the inhibitor to prepare the inhibitor solution. The flow law of inhibitor solution in coal and the prevention and control mechanism of coal spontaneous combustion were studied by various experimental methods, the extents of inhibitory effects on spontaneous coal combustion are found to differ due to the variations in properties of these liquids. Among them, the SDS and NH4H2PO4 corrosion inhibitor solution configured according to 1:1, the surface tension is significantly lower than that of pure raw coal by 62%, and the heating rate is lower than that of pure raw coal by 39%. The research results show that under the same conditions, the wetting and inhibiting effect of the corrosion inhibitor solution containing SDS on the coal is significantly improved, which provides a theoretical basis for the improvement of the inhibitor's fire-fighting technology.

Qualitative surface characterization of Indian Permian coal using XPS and FTIR

ABSTRACT This paper reports on the surface properties associated with high-ash Indian Permian coal, which primarily depend on its geochemical compositions. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) techniques have been used to assess surface properties. The results confirm the presence of different elements, mineral phases, and organic functional groups in coal. The XPS survey confirms the presence of different elements on the surface of the coal. Some of them are C 1s (286.0 eV), O 1s (534.5 eV), N 1s (399.9 eV), S 2p (158.2 eV), such as SiO2 and Al2O3, which correspond to Si 2p (102.7 eV) and Al 2p (75.6 eV) with other clay minerals. XPS spectra of C 1s confirm the presence of aliphatic and aromatic carbon, which are hydrophobic compared to hydrophilic groups such as alcoholic, carboxylic, and phenolic. FTIR also validates the existence of hydrophobic functional groups as being higher than hydrophilic groups. Proximate and ultimate analysis results also confirm the presence of less moisture and a higher carbon percentage in the coal samples. Hence, the inherent hydrophobicity of the coal surface is excellent, and the surface hydrophobicity of coal can also be characterized using XPS and FTIR techniques. This information about the coal properties will be very beneficial for coal beneficiation and utilization.

Improvement of wettability of coal seams in water injection via co-deposition of polydopamine and polyacrylamide

Water injection into coal seams is important for dust prevention in mines. However, owing to the hydrophobicity of coal itself, the wetting effect of water injection on coal seams has yet to be enhanced. Herein, based on the hydrophobicity of coal, hydrophilic modification of the coal surface has been proposed via co-deposition of polydopamine (PDA) and polyacrylamide (PAM). Using water contact angle (WCA) test, atomic force microscope (AFM) test, X-ray photoelectron spectroscopy (XPS) characterization, and 1H nuclear magnetic resonance spectroscopy (1H NMR) measurements, the feasibility of hydrophilicity modification of coal by PDA/PAM has been investigated. The results indicate that when DA concentration is 2 mg/mL, deposition time is 45 min, and DA/PAM feeding molar ratio is 1:1, the wettability of modified coal sample clearly improves. In the water content test and dust-production test using gravity drop hammer, the modified coal exhibits good wettability and low dust production. Also, UV-Vis absorption spectroscopy and WCA results suggest that PDA/PAM coating exhibits good stability. Therefore, the modification method can effectively enhance the wetting effect of injected water on coal seam, providing a novel approach for dust prevention.

The interactions of the biosurfactant surfactin in coal flotation

Surfactin, a biosurfactant, has the potential to replace synthetic surfactants in froth flotation. This research investigates the surface interactions between surfactin and coal which determine whether surfactin has collecting or depressant characteristics on coal using electrokinetic, FTIR, and micro-flotation experiments. At concentrations of 5 mg/L, surfactin removes species on the surface of coal, especially in the alkaline pH range. At surfactin concentration of 15 mg/L adsorption of surfactin onto coal surfaces are indicated and likely to be due to hydrophobic physisorption between aliphatic groups of surfactin and the hydrophobic carbonaceous surface functional groups of coal. Hydrophobicity of coal was observed to be enhanced at pH 3,6 and 10 except the intermediate pH of 8. Micro-flotation tests showed that hydrophobicity of coal was most significantly enhanced by surfactin presence at pH 3 and 15 mg/L from 42.9% to 74%, and least impacted when surfactin concentration was 5 mg/L at a pH of 10. The collecting or depressant characteristics of surfactin on coal as a function of pH and surfactin concentration have been demonstrated for the potential use of this novel biosurfactant as a Green Chemistry substitute for synthetic surfactants.

Surface Chemical Heterogeneity of Low Rank Coal Characterized by Micro-FTIR and Its Correlation with Hydrophobicity

Micro-Fourier transform infrared (micro-FTIR) spectroscopy was used to correlate the surface chemistry of low rank coal with hydrophobicity. Six square areas without mineral impurities on low rank coal surfaces were selected as testing areas. A specially-designed methodology was applied to conduct micro-FTIR measurements and contact angle tests on the same testing area. A series of semi-quantitative functional group ratios derived from micro-FTIR spectra were correlated with contact angles, and the determination coefficients of linear regression were calculated and compared in order to identify the structure of the functional group ratios. Finally, two semi-quantitative ratios composed of aliphatic carbon hydrogen, aromatic carbon hydrogen and two different types of carbonyl groups were proposed as indicators of low rank coal hydrophobicity. This work provided a rapid way to predict low rank coal hydrophobicity through its functional group composition and helped us understand the hydrophobicity heterogeneity of low rank coal from the perspective of its surface chemistry.

Wettability effect of ethoxylated nonyl phenol with different ethylene oxide chain length on Shendong long-flame coal surface

Low-rank coal is coal with a low degree of metamorphism, it has high moisture content and strong hydrophilicity. It is important for low rank coal to improve its hydrophobicity. In this paper, the wettability effects of ethoxylated nonylphenol (NPEO) with different ethylene oxide chain length on Shendong long-flame coal surface were explored. Contact angle experiments proved that long-flame coal adsorbing NPEO significantly enhances its surface hydrophobicity, and it is the most effective when the equilibrium concentration is close to its critical micelle concentration. Moreover, NPEO-8 is the best for improving the hydrophobicity of long-flame coal. Compared with long-flame coal without NPEO, the surface energy and adhesion work of coal are lower after adsorbing NPEO, in addition, NPEO-8 is the most effective of three NPEO with 8, 10 and 12 ethylene oxide. NPEO aggregate at the coal/water interface and the hydrophobic carbon chains intertwine to form a hemispherical aggregate structure, which reduce the interaction energy between water and coal. Therefore, the hydrophobicity of long-flame coal was improved after adsorbing NPEO, and NPEO-8 is the best, followed by NPEO-10, NPEO-12 is the last.

A novel coal tar-based collector for effective flotation cleaning of low rank coal

Clean utilization of low-rank coal is an important problem in coal production and sustainable development. Flotation of low-rank coal is a major challenge for clean utilization of coal resources and environmental protection in the world. Common oily collectors were not effective for low-rank coal flotation, this paper proposed a novel collector named CTB collector, which is a mixture of diesel and extracted light components from coal tar using diesel as extractant. The Gas chromatography-mass spectrometry and Fourier transform infrared spectroscopy analyses revealed that the CTB collector contained more aromatic compounds and oxygen-bearing functional groups than the diesel. The non-polar sites on coal surface can bind with the aromatic compounds through Van der Waals force and π-π stacking interaction. The polar sites can interact with the oxygen-bearing functional groups through hydrogen bond. The adsorption of macromolecular aromatic compounds on non-polar sites can also cover the polar sites adjacently. The hydrophobicity and floatability of low-rank coal were improved through above adsorption. The flotation results showed that the combustible matter recovery of CTB collector was 21%∼34% higher than that of diesel and the CTB collector can save 1500 g/t dosage than diesel while the flotation performance was still better. The coal flotation efficiency index of the CTB collector was 130–240 higher than that of the diesel. The particle carried index was designed to evaluate the carrying ability of a single bubble to coal particles. The flocs were significantly formed during flotation using the CTB collector. These flocs enhanced the recovery of low-rank coal. The particle carried index of the CTB collector-treated coal particles and bubble was higher than that of diesel-treated coal particles and bubble. The induction time results showed that the CTB collector accelerated the adhesion between coal particles and bubble while slowing down the adhesion between gangue particles and bubble. This study can not only provide new strategies for the design of coal flotation reagents and the evaluation of the adhesion efficiency between particles and bubbles, but also be beneficial to the clean utilization of coal energy and environmental protection.

Interaction between STAC and coal/kaolinite in tailing dewatering: An experimental and molecular-simulation study

The presence of clay minerals in coal tailings leads to a significant deterioration during the dewatering process. In this study, a cationic surfactant, stearyl trimethyl ammonium chloride (STAC), was considered to enhance the dewatering efficiency of coal tailings. The effect of STAC on coal tailing dewatering was evaluated by the filtration test. Results indicate that STAC can reduce filter cake moisture by increasing the hydrophobicity of particles, decreasing the surface tension of the filtrate, as well as neutralizing the associated charge. Furthermore, to investigate the interactions between STAC and coal tailings, the morphology of adsorbed STAC, interfacial adsorption structure, and dynamic behavior of water molecules were determined by atomic force microscopy (AFM) and molecular dynamics (MD) simulations on an atomic scale. AFM results revealed that the morphologies of STAC adsorbed on coal and kaolinite surfaces differed, owing to distinct interaction mechanisms. The adsorption of STAC on the kaolinite 001 surface is more uniform than on the 001- face and is predominantly based on monolayer adsorption through electrostatic interactions and hydrogen bonding. The MD simulation results suggest that the adsorption of STAC significantly inhibits the attachment of water molecules on coal and kaolinite surfaces. The nitrogen atoms of STAC were adsorbed to the particle surface, such that its alkyl chains were oriented towards water, thereby weakening the interaction between the particles and water. The above findings indicate that the addition of STAC can improve the hydrophobicity of coal and kaolinite effectively and thus, enhance the dewatering performance of coal tailings.

Enhancement of coal flotation using impact flow conditioning pulp

Large amounts of intergrowth and harmful impurities are present in fine raw coal, and the direct use of these can lead to the serious air pollution and solid waste. On the other hand, these impurities cover the surface of raw coal, resulting in the low hydrophobicity and floatability, which make it difficult to float. In this paper, a new method using impact flow conditioning pulp to enhance coal flotation was proposed, and the impact velocity of the conditioning pulp was optimized, thereby enhancing the flotation and cleaner production of coal. The enhancement mechanism of the impact flow conditioning pulp was investigated via measurements of SEM-EDS, adsorption, contact angle, and induction time. The conditioning-flotation experiments were performed to reveal the effect of the impact flow conditioning pulp with different impact velocities on coal flotation. The SEM-EDS analysis confirmed that the impact flow conditioning pulp could remove the coating covering the coal surface and improve the separation performance of coal from gangue. Furthermore, the impact flow conditioning pulp could significantly enhance the adsorption performance, hydrophobicity, and floatability of coal. The flotation results illustrated that the preconditioning using impact flow conditioning pulp improved the flotation efficiency of the coal, and an optimum ultimate combustible recovery of 92.86% was obtained at an impact velocity of 4 m/s.