Utilization Of Iron Ore Tailings Research Articles

Development of High-Strength Ceramsite via Sintering of Iron Ore Tailings: Process Optimization and Properties

This study focuses on the utilization of iron ore tailings for synthesizing high-strength concrete aggregate as a sustainable alternative to conventional stone aggregates, which are often obtained through environmentally harmful quarrying practices. The research investigates the feasibility of producing high-strength ceramsite using iron ore tailings, fly ash, and bentonite as primary raw materials. Through a uniform design method, the study deeply explores the role of iron ore tailings. To understand the relationship between compressive strength and the components used, first- and second-order polynomial equations were developed and thoroughly analyzed using stepwise regression techniques. This approach enabled the optimization of material ratios, leading to the achievement of the desired results. Additionally, the study examines the impact of varying sintering temperatures on the compressive strength, density, and water absorption of the ceramsite. Under optimized conditions, the resulting ceramsite exhibited impressive properties, with an average compressive strength of 52.33MPa, an apparent density of 2,600kg/m³, and a water absorption rate of 0%. This research highlights the potential of iron ore tailings as a sustainable alternative in the construction industry, emphasizing the development of eco-friendly building materials while reducing environmental impacts.

Utilization of iron ore tailings with high volume in green concrete

Utilization of iron ore tailings with high volume in green concrete

Realizing of ZSM-5 microspheres with enhanced catalytic properties prepared from iron ore tailings via solid-phase conversion method.

The comprehensive utilization of iron ore tailings (IOTs) not only resolved environmental problems but also brought huge economic benefits. In this study, the synthetic route presented herein provides a novel method for the synthesis of ZSM-5 microspheres from IOTs. The effects of Si/Al molar ratios and the pH of the precursor solution on the formation of zeolite was evaluated by various analytical methods. The catalytic performance of the catalyst prepared by the solid-phase conversion method (denoted as MP-ZSM-5) was evaluated by methanol-to-propylene (MTP) reaction. Compared with the zeolite catalyst that synthesized via the conventional hydrothermal method (denoted as HM-ZSM-5), MP-ZSM-5 not only prolongs catalytic lifetime from 18.7 to 36.0h but also has higher selectivity for propylene by MP-ZSM-5 (43.7%) than that for HM-ZSM-5 (38.6%). In addition, Kissinger-Akahira-Sunose (KAS) model is applied to the TG result to study the template removal process kinetics. The average activation energy values required for the removal of CTAB and TPABr are 201.11 ± 13.42 and 326.88 ± 16.91kJ∙mol-1, respectively. Furthermore, this result is well coupled with the model-free kinetic algorithms to determine the conversion and isoconversion of the TPABr and CTAB decomposition in ZSM-5, which serves as important guidelines for the industrial production process.

Novel synthesis of nanoscale zero-valent iron from iron ore tailings and green tea for the removal of methylene blue

There are comparatively abundant Fe resources remained in iron ore tailings, which is urgent to be utilized comprehensively. In this work, nanoscale zero-valent iron (T-nZVI) was firstly synthesized with iron ore tailings and green tea as raw materials to realize the efficient removal of methylene blue (MB). The formation process of T-nZVI composite nanoparticles in complex system was investigated, as well as the effect of green tea extract dosage and pH value on its composition, particle size and reactivity. The characterization results indicated that the synthesized T-nZVI nanoparticles were amorphous spherical particles, which were composed of Fe0-Al2O3 core-shell structure capped with organic substance. The removal efficiency of MB by T-nZVI nanoparticles synthesized at optimal conditions could be up to 99.46%, which was better than the nZVI nanoparticles synthesized from chemical reagent. The decolorization mechanism might be related to adsorption, reductive degradation and complex precipitation between MB molecules and T-nZVI nanoparticles. This study proposes a feasible alternative utilization of iron ore tailings to prepare high value-added nanomaterials for wastewater treatment.

Utilization of Iron Ore Tailings for Brick Manufacture from Donimalai Mines of Karnataka, India

Mixing iron tailings with cement, sand and sodium silicate for manufacturing bricks was studied with the objective of converting the iron ore tailing waste into value-added products. Bricks were prepared using different compositions of iron tailings with proportions of Ordinary Portland Cement, sodium silicate and sand in cuboid mould (9″ X 5″X 3″). Bricks were air dried for 24 hours, placed in oven for 115 ± 10 °C for 24 hours. Mechanical properties such as compressive strength (CS), water absorption (WA), and efflorescence were measured. The maximum CS of 8.58 N/mm 2 was recorded for tailing and cement ratios of 8:2. However, for making it more economical the ratio of 9:1 was considered and this compares very well with the Indian standard (IS): 3495 (Part 1) (1992) of bricks. The results also indicated that the tailing percentage in the bricks affects their mechanical properties. The WA rates of the manufactured bricks are low compared to standard fired clay bricks, and the same varies with process parameters. The low capillary pore may deter the formation of efflorescence. The process, with standardized parameters, may be commercially adapted, and large quantities of iron ore tailings may be put to use in making bricks. Thus, the process technology observed in this paper can potentially convert the huge amount of environmentally hazardous waste into value added product. Iron ore tailing may materialize as a sustainable supplement to soil's clay, use of which in brick making is restricted. The finding also usher a new area of research.

Seed-Assisted, OSDA-Free, Solvent-Free Synthesis of ZSM-5 Zeolite from Iron Ore Tailings

Comprehensive utilization of iron ore tailings (IOT) not only solves environmental problems but also creates huge economic benefits. Our approach is focused on reutilization of IOT by converting it to ZSM-5 zeolite. The solvent and organic structure-directing agents (OSDA) used in the hydrothermal synthesis of ZSM-5 zeolite are major obstacles to achieve the sustainable synthesis routes. Therefore, the development of environmentally friendly ZSM-5 zeolite synthesis method is strongly desired. Here, ZSM-5 zeolite is synthesized successfully from IOT via a seed-assisted, solvent-free method without using the organic template or solvent. In addition, the influences of Na2CO3·10H2O/SiO2 molar ratio, amount of seeds, and crystallization process of ZSM-5 are systematically investigated. The raw materials and as-synthesized products are characterized by XRD, XRF, SEM, 27Al MAS NMR, and BET analysis; and the ZSM-5 zeolite synthesized by seed-assisted, OSDA-free, solvent-free method has the same mesoporous and microporous structure as the seed crystal. The synthetic route proposed in this work provides a novel green alternative for the synthesis of ZSM-5 from IOT. Figure schematic illustration of the seed-assisted, OSDA-free, solvent-free synthesis of ZSM-5 .

Utilization of Iron Ore Tailings for the Production of Fly Ash — GGBS-Based Geopolymer Bricks

In India, million tons of manufacturing ravages such as ground-granulated blast furnace slag (GGBS), fly ash and mine tailings, are endangering. These ravages turn out to be injurious as they are landfilled close to the production sites and somewhere else. Since these manufacturing ravages include silica, alumina, calcium, etc., it is probable to formulate these as unprocessed resources to produce building substance which diminishes the carbon trace. In this circumstance, this analysis observes on utilizing iron ore tailings and slag sand as a substitution for clay or natural sand for the construction of steady geopolymer obstruct. Furthermore, in this analysis, geopolymer is utilized as a binder rather than cement. Expansion of geopolymer binder-oriented bricks with fly ash and GGBS has been implemented in this study. The analysis consists of automatic possessions of the geopolymer bricks. Sodium silicate ([Formula: see text]) and sodium hydroxide (NaOH) resolution have been employed as alkaline activators. The proportion of alkaline liquid to aluminosilicate solid quotient and fraction of binder encompass foremost control on the force of brick. The bricks were casted and cured at ambient warmth. The compressive strength was tested at 7, 14 and 28 days.

Utilization of Iron Ore Tailings in Manufacture of Stabilized Compressed Building Bricks

Utilization of Iron Ore Tailings in Manufacture of Stabilized Compressed Building Bricks

Effect of Tourmaline-Doped on the Far Infrared Emission of Iron Ore Tailings Ceramics.

Iron ore tailings as secondary resources have been of great importance to many countries in the world. Their compositions are similar to that of infrared emission ceramics, but there are few reports about it. In addition, tourmaline has high infrared emission properties due to its unique structure. With the purpose of expanding functional utilization of iron ore tailings, as well as reducing the production cost of far infrared ceramics, a new kind of far infrared emission ceramics was prepared by using iron ore tailings, calcium carbonate, silica, and natural tourmaline. The ceramics powders were characterized by Fourier transform infrared spectroscope, X-ray diffraction and scanning electron microscopy, respectively. The results show that after being sintered at 1065 °C, the percentage of pseudobrookite and lattice strain of samples increased with increasing the elbaite content. Furthermore, the added tourmaline was conducive to the densification sintering of ceramics. The appearance of Li-O vibration at 734.73 cm-1, as well as the strengthened Fe-O vibration at 987.68 cm-1 were attributed to the formation of Li0.375Fe1.23Ti1.4O5 solid solution, which led the average far infrared emissivity of ceramics increase from 0.861 to 0.906 within 8-14 µm.

Connotation of Iron Ore Tailings Comprehensive Utilization

This paper concludes what the comprehensive utilization of iron ore tailings is through analysis, and in order to develop and use the iron ore tailings, comprehensive utilization of iron ore tailings shall be the precondition of the iron ore tailing integrated utilization; comprehensive utilization means efficient, clean, and sustainable utilization; which can guiding the development and use of iron ore tailings.

Influencing Factors Analysis of Iron Ore Tailings Comprehensive Utilization

This paper finds out four kinds of main influencing factors of the comprehensive utilization of iron ore tailings from the historical and realistic perspectives: single view of development of economic growth, views of useless waste, insufficient science and technology, and inadequate management systems, which plays an important role in guiding the development and use of iron ore tailings.

Utilization of iron ore tailings as fine aggregate in ultra-high performance concrete

Iron ore tailings are a common type of hazardous solid waste in China and have caused serious environmental problems, and the high cost of producing ultra-high performance concrete (UHPC) provides the motivation to look for low-priced raw materials. In this paper, the possibility of using iron ore tailings to replace natural aggregate to prepare UHPC under two different curing regimes was investigated. It was found that 100% replacement of natural aggregate by the tailings significantly decreased the workability and compressive strength of the material. However, when the replacement level was no more than 40%, for 90days standard cured specimens, the mechanical behavior of the tailings mixes was comparable to that of the control mix, and for specimens that were steam cured for 2days, the compressive strengths of the tailings mixes decreased by less than 11% while the flexural strengths increased by up to 8% compared to the control mix. In addition, pore structure analysis revealed a coarsening of micro-pore structure with an increase of the tailings content and a good correlation between the porosities and compressive strengths of the UHPC matrices, and microstructure image showed a possibly poor interfacial transition zone around some tailings particles.

Preparation of Construction Bricks from Iron Ore Tailings

Based on the background that large amount of iron ore tailings are stockpiled in China, the utilization of iron ore tailings to prepare sintering brick was studied. The main objective of this paper was to investigate the influence of sintering temperature on sintering bricks from iron ore tailings, in the presence of clay, coal refuses and bentonite. Sintering bricks were prepared at different temperature with 40 wt% iron ore tailings. Drying was investigated as well as the loss on ignition, bulk density and compressive strength of the specimens. Their mechanical and microstructure properties were also investigated by radioactivity, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that compressive strengths of the specimens produced were higher than that required by the standards MU20 of GB5101-2003, up to 128.0Mpa at 1100°C corresponding to its higher bulk density completely.

Experimental Study on the Performances of Cement Stabilized Iron Ore Tailing Gravel in Highway Application

Iron ore tailings as a kind of waste products after ore dressing is one of the major industrial solid wastes. Iron ore tailings not only cover huge land and pollute environment, but also give rise to security risks. The comprehensive utilization of iron ore tailings need to be studied systematically. According to the method in Test Methods of Materials Stabilized with Inorganic Binders for Highway Engineering, the technical performances of cement stabilized iron ore tailing gravel in highway application were studied by systemic experiments in this paper. These include the strength, modulus, and frost resistance property, water stability. And the influencing factors of the mixture strength were analyzed, too. The results show that the mixture of cement stabilized iron ore tailing gravel has higher strength and modulus, good frost resistance property and water stability. The technical performances of cement stabilized iron tailing gravel conform to the current specification, so it can be used as sub-base course or base course material.

Innovative methodology for comprehensive utilization of iron ore tailings: Part 2: The residues after iron recovery from iron ore tailings to prepare cementitious material

In order to comprehensive utilization of iron ore tailings, this experimental research was to investigate the possibility of using the residues after iron recovery from iron ore tailings as raw materials for the preparation of cementitious material, abbreviated as TSC, including analyses of its mechanical properties, physical properties and hydration products. The TSC1 was prepared by blending 30% the residues, 34% blast-furnace slag, 30% clinker and 6% gypsum. Meanwhile, the raw iron ore tailings (before iron recovery) with the same proportion of TSC1 were selected to compare the cementitious activity of raw tailings and the residues after magnetizing roasting, denoted by TSC0. The hydration products of them were mostly ettringite, calcium hydroxide and C–S–H gel, characterized by XRD, IR and SEM. It was found that ettringite and C–S–H gel were principally responsible for the strength development of TSC mortars with curing time. The results showed that the kaolinite of the tailings was decomposed completely after magnetizing roasting, which promoted the cementitious property of TSC1. Moreover, the mechanical properties of TSC1 are well comparable with those of 42.5 ordinary Portland cement according to Chinese GB175-2007 standard.

Innovative methodology for comprehensive utilization of iron ore tailings: Part 1. The recovery of iron from iron ore tailings using magnetic separation after magnetizing roasting

Iron ore tailings have become one kind of the most hazardous solid waste. In order to recycle iron in the tailings, we present a technique using magnetizing roasting process followed by magnetic separation. After analysis of chemical composition and crystalline phase, according to experimental mechanism, the effects of different parameters on recovery efficiency of iron were carried out. The optimum reaction parameters were proposed as the following: ratio of coal: iron ore tailings as 1:100, roasting at 800 °C for 30 min, and milling 15 min of roasted samples. With these optimum parameters, the grade of magnetic concentrate was 61.3% Fe and recovery rate of 88.2%. With this method, a great amount of iron can be reused. In addition, the microstructure and phase transformation of the process of magnetizing roasting were studied.

Current situation and comprehensive utilization of iron ore tailing resources

The situations, characteristics, and status of iron ore tailing resources in China are presented. The approaches of comprehensive utilization of iron ore tailings have been analyzed. It has been proved that the comprehensive utilization of iron ore tailings is efficient, socially beneficial and improves environment situation. The scopes of comprehensive utilization of iron ore tailings are reported.