Utilization Of Iron Tailings Research Articles

Transforming Mining Waste to Wealth: A Novel Process for the Sustainable Recovery and Utilization of Iron Tailings through HCl Leaching and MOFs Absorption

Rapid economic development and increased demand for mineral products in China have led to extensive extraction of various ores, resulting in significant environmental challenges associated with the generation of industrial solid waste, particularly iron tailings. Despite being a major mining nation, China faces issues of wasteful practices, with substantial amounts of valuable elements lost during the processing of iron ore. This study addresses the urgent need for sustainable solutions by proposing an innovative approach for the recovery of valuable elements from iron tailings. The proposed process involves a sequential application of acid leaching, chemical precipitation, and Metal-Organic Frameworks (MOFs) ion adsorption. The pre-treated iron tailings were leached in HCl solution with pH 1.5 at 70 °C for 2 h, and the co-leaching efficiency of 98.1% V, 98.2% Mo, 99.3% Fe, and 98.7% Mg was obtained. Chemical precipitation is then employed to isolate Fe, Mg V, and Mo and promote the formation of targeted compounds, ensuring concentration and purity. The integration of MOF ion adsorption, known for its high surface area and tunable pore structures, provides an efficient platform for selectively capturing and recovering target ions. 97.7% V and 96.3% Mo were selectively extracted from Zirconium 1,4-carboxybenzene metal-organic framework (UiO-66) adsorption system with pH 5.0 at 30 °C for 6 h, and 91.7% V and 90.3% Mo were selectively extracted from 2-methylimidazole zinc salt metal-organic framework (ZIF-8) adsorption system with pH 5 at 30 °C for 6.0 h. This three-stage process offers an efficient method for the recovery of valuable elements from iron tailings.

Utilization of iron tailings as aggregates in paving asphalt mixture: A sustainable and eco-friendly solution for mining waste

Iron tailings are a type of solid waste yielded during the beneficiation process of iron mine. Its effective utilization has been of great concern in scientific community. The objective of this study is to systematically evaluate the feasibility of iron tailings as aggregates in paving asphalt mixture and investigate the methods of performance enhancement to improve its applicability in pavement engineering. To this end, a suite of tests and analyses was carried out on iron tailings and asphalt mixtures containing iron tailings. Results showed that the conventional physical properties of iron tailings can meet specification requirements. The weak adhesion of iron tailings to asphalt was due to acidic chemical compositions, but the adhesion gap between it and natural aggregates can be narrowed by utilizing high-viscosity asphalt. In terms of pavement performances, the asphalt mixtures with iron tailings coarse aggregates possessed a satisfactory high-temperature performance, but its low-temperature performance and moisture stability were poor relatively. By means of using limestone as fine aggregate or applying modified asphalt with superior properties, various key performances can reach the technical requirements for application in pavement. Moreover, the pavement performances of asphalt mix containing iron tailings can be further enhanced through adding hydrated lime or silane coupling agent and the comprehensive level surpassed conventional modified asphalt mixture that has been applied maturely in actual pavement project at present. Additionally, it is noteworthy that the recycling of iron tailings in asphalt pavement will also create huge benefits in the aspect of economy, environment and society.

Study on the Utilization of Iron Tailings in Ultra-High-Performance Concrete: Fresh Properties and Compressive Behaviors.

In this paper iron tailing sand (TS) are used as aggerate to develop ultra high-performance concrete (UHPC). The mix proportion of UHPC is designed and TS were added by 25%, 50%, 75% and 100% (wt.%, i.e., weight percentage) to replace natural river sand. Firstly, the influence of TS on the slurry behavior was carried out. The experimental result indicates that with the continuously increasing content of TS, the workability of slurry decreases, while the air content increases. Considering the workability, the optimal replacing dosage of TS should be less than 50%. Then, tests for the hardened specimens were taken. The compressive behavior and micro-porosity deteriorate with increasing content of TS, and the compressive strength had a positive linear relationship with the workability, which indicated that the decline the compressive behavior is mainly due to the loss of flowability. Finally, autogenous shrinkages of UHPC with different TS dosage were also tested. At the same time, the micro-structure of specimens was discussed, which was deteriorate with the increasing dosage of TS. Therefore, comprehensively considering the compressive behavior, micro-structure and shrinkage behavior, as much as 50% of the aggregate could be replaced by TS when developing UHPC.

Utilization of iron tailings as fine aggregates in low-grade cement concrete pavement

Iron tailings are a kind of industry waste generated during the ironmaking. Huge quantities of iron tailings caused many environmental problems. There is a strong demand for reducing the reserves of iron tailings. The primary of the study presented in this paper aims to explore the potential of applying iron tailings to cement concrete pavement to replace fine aggregates. The iron tailings concrete (ITC) is prepared and tested by performance tests to evaluate its mechanical properties (compressive strength, flexural strength and flexural modulus) and durability (abrasion resistance, water absorption, shrinkage ability and frost resistance). The results show that all the indexes can meet the requirement of rural low-grade cement concrete. This study provides a feasible way to solve the problem of excess iron tailings and a new way to reuse waste materials.

Utilization of iron tailings as substitute in autoclaved aerated concrete: physico-mechanical and microstructure of hydration products

Based on the background that a large amount of iron tailings was stockpiled in China, the most appropriate preparation conditions of producing autoclaved aerated concrete (AAC) with iron tailing was studied. The slurry properties were tested to evaluate the effects of the raw material factors on gas forming character. The compressive and specific strengths were measured to assess the feasibility of producing B05, A2.5 AAC blocks. The analysis of morphology, mineral components and thermal property were carried out in order to determine the mineral composition of iron tailing AAC blocks. Leaching toxicity was determined to ensure the environmental safety of iron tailing AAC blocks. The results shows that under the following conditions, cement 8%, quicklime 21%–27%, 20 min ball milled siliceous 62%–68% (with 40%–60% substituted by iron tailings), gypsum 3%, ratio of water to raw material (W/R) 0.6, aluminum (Al) powder 0.14% and at 1.4 MPa steam pressure maintaining for 8 h, the bulk density can be between 490 and 525 kg/m3, compressive strength higher than 2.5 MPa and specific strength higher than 4700 N m/kg. The main minerals in the AAC were dough-like CSH gel, flake-like tobermorite and long-strip anhydrate besides quartz and other residual minerals from the iron tailings. The compressive strength is mainly attributed to the interconnected microstructure constituted of CSH gel and tobermorite. The thermal analysis also proved the existing of the main minerals.

Influences of Polypropylene Fiber on Properties of Foam Concrete with Iron Tailings

Iron tailings are mineral wastes obtained from industrial processing and magnetic separation of iron ore. Foam concrete with iron tailings can be made with iron tailings, cement, fly ash, silica fume, polypropylene fiber, superplasticizer, early strength agent, accelerating agent and foaming agent. The influences of polypropylene fiber on the crack resistance and frost resistance of foam concrete have been investigated in this study. Further, the microstructure of foam concrete was observed. This result demonstrates that polypropylene fiber has greatly increased the crack resistance and frost resistance of foam concrete. The pore structure of foam concrete is improved obviously by polypropylene fiber. Due to the uniformly distributed pores, high porosity and rather complete pore wall, the mechanical properties and thermal properties of foam concrete are excellent. The foam concrete with high-strength and excellent thermal insulation property develops a new route for the comprehensive utilization of iron tailings.

Cherish the Earth's Mineral Resources and Promote the Comprehensive Utilization of Iron Tailings

With the increasing amount of tailings, it has brought many serious problems like take up a lot of land, construction and maintenance tailings reservoirs must be consume a large amount of money. The stockpiled tailings is not only bring drawbacks, but also bring huge economic benefits for us. For example, recycling of useful components contained in the tailings, or use the tailings as a whole. This article introduction the tailings status, utilization and point out direction of future development of tailings utilization.

Utilization of Iron Tailings for High Strength Fired Brick

his paper studies the feasibility of preparation high strength fired bricks from iron tailings with addition of clay and coal gangue. The results indicated that the optimum conditions were found to be that the hematite tailings content were 35%–50%; the firing temperature was 1000 °C. Under these conditions, the mechanical strength, the water absorption and the bulk density of the fired bricks were 21.17–26.14 MPa, 14.55–15.47% and 1.648–1.629g/cm3, respectively, these were well conformed to standards MU20 of Chinese Fired Common Bricks Standard (GB/T5101-2003).The phase composition and microstructure of the fired specimen were characterized by XRD and SEM. The results showed that the major crystalline phases present in fired brick were quartz, albite, amphibole, hematite and muscovite, and glass phase encapsulated and cement the crystalline phases forming strong entirety which promoted the strength of bricks.

Analysis of the Mineral Components and Strengths of the Cementuous Materials Produced with Iron Tailings

This essay is the subject of national eleventh five support schemes(Number:2008BAB32B14). Applied with testing method, this essay makes a breakthrough in the high-value utilization of iron tailings. According to the tests datas, the cementuous materials acquired from the designed test proved to be qualified for pratical projects. According to the GB/175-2007, the cementuous material sample with 6% iron tailings has got the strenghth that is equal to 52.5# Portland cement; and the cementuous material sample with 10% iron tailings has got the strenghth that is equal to 42.5R Portland cement.