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Search Results (12)
  • Open Access

    ARTICLE

    Ash Detection of Coal Slime Flotation Tailings Based on Chromatographic Filter Paper Sampling and Multi-Scale Residual Network

    Wenbo Zhu1, Neng Liu1, Zhengjun Zhu2,*, Haibing Li1, Weijie Fu1, Zhongbo Zhang1, Xinghao Zhang1

    Intelligent Automation & Soft Computing, Vol.38, No.3, pp. 259-273, 2023, DOI:10.32604/iasc.2023.041860

    Abstract The detection of ash content in coal slime flotation tailings using deep learning can be hindered by various factors such as foam, impurities, and changing lighting conditions that disrupt the collection of tailings images. To address this challenge, we present a method for ash content detection in coal slime flotation tailings. This method utilizes chromatographic filter paper sampling and a multi-scale residual network, which we refer to as MRCN. Initially, tailings are sampled using chromatographic filter paper to obtain static tailings images, effectively isolating interference factors at the flotation site. Subsequently, the MRCN, consisting of a multi-scale residual network, is… More >

  • Open Access

    ARTICLE

    Development of Wet Shotcrete with Solid Waste as Aggregate: Strength Optimization and Mix Proportion Design

    Yafei Hu1,2, Keqing Li1,2, Bo Zhang1,2, Bin Han1,2,*

    Journal of Renewable Materials, Vol.11, No.9, pp. 3463-3484, 2023, DOI:10.32604/jrm.2023.027532

    Abstract The super-fine particle size of tailings is its drawback as a recycled resource, which is reflected in the low strength of the new construction and industrial materials formed when it is mixed with cement and other cementitious materials. Therefore, it is crucial to study the effect of tailings particle size and cementitious material on the strength of tailings wet shotcrete (TWSC) and to investigate the optimal mix proportion. In this paper, a multivariate nonlinear response model was constructed by conducting central composite experiments to investigate the effect of different factors on the strength of TWSC. The strength prediction and mix… More >

  • Open Access

    ARTICLE

    Fly Ash and Slag as Partial Replacement of Cement for the Synthesis of Low Carbon Cementitious Materials

    Yafei Hu1,2, Keqing Li1,2, Lujing Zheng3, Bin Han1,2,*

    Journal of Renewable Materials, Vol.11, No.5, pp. 2491-2511, 2023, DOI:10.32604/jrm.2023.025129

    Abstract Tailings known as solid waste are generated by the mining industry. The development of tailings as wet shotcrete aggregates has significant economic and environmental benefits. The fine particle size of the tailings results in a large consumption of traditional cement as a cementitious material and insignificant improvement in strength. Therefore, a composite cementitious system of cement and solid waste resources (fly ash and slag powder) is explored for this study. In this paper, the response surface methodology (RSM) is used to optimize the experimental design and a multivariate nonlinear response model with cement, fly ash and slag powder contents as… More >

  • Open Access

    ARTICLE

    Effect of Natural Zeolite on Pore Structure of Cemented Uranium Tailings Backfill

    Fulin Wang*, Xinyang Geng, Zhengping Yuan, Shijiao Yang*

    Journal of Renewable Materials, Vol.11, No.3, pp. 1469-1484, 2023, DOI:10.32604/jrm.2022.024994

    Abstract The use of some environmental functional minerals as backfill-modified materials may improve the leaching resistance of cemented uranium tailings backfill created from alkali-activated slag (CUTB), but these materials may participate in the hydration reaction of the cementitious materials, which could have a certain impact on the pore structure of the CUTB, thus affecting its mechanical properties and leaching resistance. In this paper, natural zeolite is selected as the backfill-modified material, and it is added to alkali-activated slag paste (AASP) and CUTB in cementitious material proportions of 4%, 8%, 12%, and 16% to prepare AASP mixtures and CUTB mixtures containing environmental… More >

  • Open Access

    ARTICLE

    Study on Strength Reduction Law and Meso-Crack Evolution of Lower Layered Cemented Tailings Backfill

    Huazhe Jiao1,2,3, Wenxiang Zhang1,2,3,*, Yunfei Wang1,2,3,*, Xinming Chen1,2,3, Liuhua Yang1,2,3, Yangyang Rong1,2,3

    Journal of Renewable Materials, Vol.11, No.3, pp. 1513-1529, 2023, DOI:10.32604/jrm.2023.026008

    Abstract The green disposal of tailings solid waste is a problem to be solved in mine production. Cemented tailings filling stoping method can realize the dual goals of solid waste resource utilization and mined-out area reduction. However, the volume of the mined-out area of the open-pit method is larger than the filling capacity, resulting in the complex stratification of the underground backfill, and the strength of the backfill cannot meet the requirements. In this paper, according to the delamination situation, the specimens of horizontal and inclination angle layered cemented tailings backfill (LCTB) is made for a uniaxial compression test, and the… More >

  • Open Access

    ARTICLE

    Utilization of Low-Alkalinity Cementitious Materials in Cemented Paste Backfill of Gold Mine Tailings

    Jiamao Li1,2,*, Chuimin Zhang1, Lin Li1, Chuangang Fan1,*, Zhaofang He3, Yuandi Qian3

    Journal of Renewable Materials, Vol.10, No.12, pp. 3439-3458, 2022, DOI:10.32604/jrm.2022.021214

    Abstract The purpose of this paper was to explore the possibility of using low-alkalinity cementitious materials as binders, in which ground blast furnace slag and fly ash acted as a partial replacement of ordinary Portland cement, and CaSO4, Na2SO4, and CaO were used as a sulfate activator and alkali-activated additives, to solidify gold mine tailings for preparation of a green, inexpensive cemented paste backfill (CPB). For this target, the effects of cement/ tailings ratio, superplasticizer dosage, solid content, tailings fineness on the mechanical properties of the CPB were investigated. Additionally, the hydration mechanism of the CPB was analyzed based on X-ray… More >

  • Open Access

    REVIEW

    Phytoremediation of Rare Tailings-Contaminated Soil

    Min Huang, Zhirong Liu*, Xiang Li

    Journal of Renewable Materials, Vol.10, No.12, pp. 3351-3372, 2022, DOI:10.32604/jrm.2022.022393

    Abstract In order to achieve the goal of circular economy and sustainable development of ecological environment, it is important to separate and recover associated elements from rare mineral resources. Compared with traditional physical and chemical remediation methods of contaminated soil, phytoremediation is regarded as the most promising green in-situ restoration technology. The purpose of this review is to effectively alleviate the environmental problems caused by rare tailings contaminated soil through phytoremediation and realize the recovery of uranium-thorium, rare earth elements (REEs) and tantalum-niobium. This review took rare tailings with uranium-thorium, REEs, tantalum-niobium in China as the research object, then the background,… More >

  • Open Access

    ARTICLE

    Fabrication of Baking-Free Bricks Using Gold Tailings and Cemented Materials with Low Alkalinity

    Jiamao Li1,2,*, Tao Si1, Lin Li1, Chuangang Fan1,*, Zhaofang He3, Yuandi Qian3

    Journal of Renewable Materials, Vol.10, No.11, pp. 3041-3058, 2022, DOI:10.32604/jrm.2022.020054

    Abstract The purpose of this paper was using gold mine tailings and cemented materials with low alkalinity to fabricate baking-free bricks. The obtained baking-free brick samples were evaluated by unconfined compressive strength (UCS), water absorption percentage, freezing-thawing cycle, and drying-wetting cycle. The microstructures of the baking-free brick samples were analyzed using X-ray diffraction (XRD) and scanning electron microscope (SEM) techniques. The baking-free brick specimens cured for 28 days with the addition of 10% mixing water consumption and 1:6 cement/tailing ratio tended to obtain favorable comprehensive properties such as a high compressive strength of 15.15 MPa, a low water absorption percentage of… More > Graphic Abstract

    Fabrication of Baking-Free Bricks Using Gold Tailings and Cemented Materials with Low Alkalinity

  • Open Access

    ARTICLE

    Preparation of Micro-Iron Ore Tailings by Wet-Grinding and Its Application in Sulphoaluminate Cement

    Yingchun Yang1,*, Liqing Chen1, Xingdong Sun1, Yuguang Mao2

    Journal of Renewable Materials, Vol.10, No.4, pp. 1007-1023, 2022, DOI:10.32604/jrm.2022.017372

    Abstract Herein, micro iron ore tailings (micro-IOTs) were prepared by wet-grinding and applied to improve sulphoaluminate cement (SAC) performance. The physicochemical properties of micro-IOTs were investigated by particle size analysis, XRD, and XPS. The hydrates trait and the hydration mechanism of micro-IOTs-SAC composite were studied by XRD, TGA, MIP, and SEM. The results demonstrated that micro-IOTs with an average grain diameter of 517 nm could be obtained by wet-grinding. The setting time of SAC gradually decreased with increasing micro-IOTs content. By adding 2% micro-IOTs, the compressive strengths of SAC pastes were enhanced about 22% and 10% at 4 h and 28… More >

  • Open Access

    ARTICLE

    Different Effects of Wet and Dry Grinding on the Activation of Iron Ore Tailings

    Yingchun Yang1,*, Liqing Chen1, Yuguang Mao2

    Journal of Renewable Materials, Vol.9, No.12, pp. 2261-2276, 2021, DOI:10.32604/jrm.2021.015793

    Abstract 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… More > Graphic Abstract

    Different Effects of Wet and Dry Grinding on the Activation of Iron Ore Tailings

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