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Determination of critical state line(CSL)for silty-sandy iron ore tailings subjected to low-high confining pressures

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1684-1695页

作者： Nilo Cesar Consoli João Vítor de Azambuja Carvalho Alexia Cindy Wagner Hugo Carlos Scheuermann Filho Inácio Carvalho Pedro Pazzoto Cacciari João Paulo de Sousa Silva Civil Engineering Universidade Federal do Rio Grande do SulPorto AlegreRS90035-190Brazil Exploration and Mineral Projects-Mineral Development Centre VALE S.A.Santa LuziaMG33040-900Brazil Department of Civil Geological and Mining EngineeringPolytechnique MontrealQuebecH3C 3A7Canada

The disposal of filtered tailings in high dry stacks can induce particle breakage,changing the material's behaviour during the structure's lifetime.The grading changes influence material properties at the critical state,and this is not mature for intermediate artificial soils(tailings)in a broad range of confining pressures.In this paper,it aims to describe the behaviour of iron ore tailings in a spectrum of confining pressures broader than the reported in previous studies.A series of consolidated drained(CD)triaxial tests was carried out with confining pressures ranging from 0.075 MPa to 120 MPa.These results show that the amount of breakage plays an essential role in the response of iron ore tailings.The existence of curved critical state line(CSL)in both specific volume(ν)-logarithm of mean effective stress(p′)and deviatoric stress(q)-mean effective stress(p′)planes,and different responses in the deviatoric stress-axial strain-volumetric strain curves were verified.An inverse S-shaped equation was proposed to represent the silty-sandy tailings'behaviour up to high pressures onν-lnp′plane.The proposed equation provides a basis for enhancing constitutive models and considers the evolution of the grading up to severe loading conditions.The adjustment considered three regions with different responses associated with particle breakage at different pressure levels.

关键词： tailings iron ore tailings dry stacking Silty-sandy material Critical state soil mechanics High confining pressures Particle breakage

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iron ore tailings used for the preparation of cementitious material by compound thermal activation

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 355-358页

作者： Zhong-lai Yi Heng-hu Sun Xiu-quan Wei Chao Li Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Resources China University of Mining ＆ Technology （Beijing） Beijing 100083 China

In the background of little reuse and large stockpile for iron ore tailings, iron ore tailing from Chinese Tonghua were used as raw material to prepare cementitious materials. Cementitious properties of the iron ore tailings activated by compound thermal activation were studied. Testing methods, such as XRD, TG-DTA, and IR were used for researching the phase and structure variety of the iron ore railings in the process of compound thermal activation. The results reveal that a new cementitious material that contains 30wt% of the iron ore tailings can be obtained by compounded thermal activation, whose mortar strength can come up to the standard of 42.5 cement of China.

关键词： iron ore tailings comprehensive utilization cementitious materials thermal activation

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Hydrometallurgical Processing of Brazilian iron ore tailings for the Synthesis of Pigments

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Geomaterials 2022年第2期12卷 30-36页

作者： Vitor Otacílio de Almeida Ivo André Homrich Schneider Department of Mining Engineering Federal University of Rio Grande do Sul Porto Alegre Brazil

The aim of this study was to investigate the synthesis of iron oxide pigments from IOT. The sample of IOT was obtained through mining activity of the Quadrilátero Ferrífero in the state of Minas Gerais, Brazil. The procedure was carried out by hot acid leaching with hydrochloric acid (HCl) which allowed the recovery of about 95% of the iron in a liquor. The iron-based pigments—red (IBP_R), black (IBP_B), and yellow (IBP_Y)—were synthetised from the liquor by selective precipitation, crystallisation, and thermal procedures. The pigments were characterised by particle size distribution, mineral and chemical compositions, as well as colourimetric properties. The process of synthesis was successful and the procedure was shown to maximise the utilisation of mineral resources and minimise the environmental, social, and economic impacts associated with IOT disposal.

关键词： iron ore tailings Pigments iron Oxide Waste Management Hydrometallurgy

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Pavement Performance Research Progress and Evaluation of Asphalt Mixture Incorporating iron ore tailings

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World Journal of Engineering and Technology 2022年第3期10卷 487-501页

作者： Yuefeng Zhu Jiawei Zhang Jie Yang Gang Wang Xiangzhen Zhao School of Traffic and Transportation Shijiazhuang Tiedao University Shijiazhuang China China Railway Shanghai Design Institute Group Co. Ltd. Nanjing Design Institute Nanjing China

In order to solve the problems caused by the storage of iron ore tailings (IOTs), many researchers conducted a series of experimental studies on the reuse of IOTs. The results of many studies showed that it was feasible to use IOTs for road engineering. This paper summarized the composition, gradation and particle characteristics of IOTs from chemical and physical aspects, and proved the feasibility of IOTs replacing traditional aggregate for asphalt concrete. Then, the research on the road performance of asphalt concrete incorporating IOTs were summarized and reviewed, including the evaluation of high-temperature stability, low-temperature crack resistance, fatigue resistance and water stability. The water stability and the improvement of adhesion between asphalt and IOTs aggregate were discussed in detail. Finally, the performance of IOTs as asphalt concrete aggregate and the existing defects were evaluated, and future research directions were proposed.

关键词： iron ore tailings Concrete Asphalt Mixture Adhesivity

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Different Effects of Wet and Dry Grinding on the Activation of iron ore tailings

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Journal of Renewable Materials 2021年第12期9卷 2261-2276页

作者： Yingchun Yang Liqing Chen Yuguang Mao College of Engineering Anhui Agricultural UniversityHefei230036China College of Civil Engineering Hunan UniversityChangsha410082China

Improving the activity of iron ore tailings(IOTs)to utilize them as a mineral admixture in cement-based minerals is still challenging.In this paper,the wet grinding technology was employed to stimulate the activity of IOTs,and the traditional dry grinding method was used as a reference.The effect of wet grinding on the activation of IOTs was evaluated through ion leaching from an alkaline solution and the reactivity index.Additionally,a detailed comparison between Dry-grinding iron ore tailings(DIOTs)and Wet-grinding iron ore tailings(WIOTs)was made.This comparison was based on particle characteristics,crystal structures,chemical structure,and surface properties.The results showed that the particle size of IOTs reduced rapidly during wet grinding.In addition,WIOTs had a higher activity index compared to DIOTs.The storage of lattice distortions in the quartz crystal structure was also more significant during the wet grinding process than during the dry grinding process.Moreover,both prolonged dry and wet grinding could destabilize the Si-O bond and decrease the surface binding energy.

关键词： Wet grinding iron ore tailings particle characteristics mineral admixture

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