Online office system

更多>>

Author contribution system Expert system reviews Edit office system

Introduction

更多>>

《矿产保护与利用》是矿业综合类双月刊，1981年创刊，国内外公开发行，现由国土资源部矿产资源储量司指导，中国地质科学院郑州矿产综合利用研究所主办，主要报道国家矿产资源的开发、利用与保护方面的方针、政策和法律、法规……更多

Honors

更多>>

Page view

访问量:10188

QR code

更多>>


Current issues

  • Research and Progress of Comprehensive Utilization Technologies of China's Coal Gangue in the Context of Carbon Peaking and Carbon Neutrality

    HE Zhanwei;HE Shuai;WANG Guishuai;LI Shihao;CHEN Guangyu;GAO Mangmang;LI Huibiao;School of Materials and New Energy, Ningxia University;Pengyang Xinzhuo Energy Technology Development Co., Ltd;

    In the context of carbon peaking and carbon neutrality, China is continuously promoting the upgrading of industrial and energy structures, advocating for green, environmentally friendly, and low-carbon development. The massive accumulation of coal gangue in our country has led to serious waste of resources and may trigger a series of environmental issues. The effective treatment and resource utilization of coal gangue have become urgent tasks for the coal industry. This paper systematically reviews the research progress of coal gangue in the fields of metal extraction, material preparation, combustion utilization, and ecological restoration. Coal gangue can recover metal elements such as aluminum,iron, and the "three rare" elements, but the recovery process is prone to produce a large amount of waste acid and slag,posing potential environmental pollution risks. In addition, coal gangue can not only serve as traditional building materials such as concrete aggregate, brick, and cement raw materials but can also be used to prepare high-value-added new materials such as porous ceramics and zeolites. The application of co-combustion technology helps to improve the thermal energy utilization efficiency of coal gangue and reduce greenhouse gas emissions. As a soil conditioner, coal gangue shows promising prospects in ecological restoration, but attention should be paid to the risk of secondary pollution caused by heavy metal ions. Based on the current problems and challenges in the treatment of coal gangue, this review systematically explores the path of future high-quality development of coal gangue, and proposes the use of a variety of utilization methods combined with the strategy to achieve the resourceful utilization of coal gangue, which in turn promotes the coordinated development of the economy, environment and social benefits.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 964K]

  • Development Status and Prospects of Coal Based Solid Waste Filling Materials and Filling Mining Technology

    LIU Pengliang;CCTEG Coal Mining Research Institute;Coal Mining and Design Department, Tiandi Science and Technology Co., Ltd.;

    Coal based solid waste is one of the major industrial wastes, and its large-scale disposal and utilization are of great practical significance for the sustainable development of the coal industry and the protection of the ecological environment in mining areas. As a green mining method that combines underground disposal of coal based solid waste and "three down" coal pressure recovery, backfill mining has been rapidly developed and applied in the past 20 years, forming a technical system mainly consisting of solid and paste filling materials, and fully mechanized and continuous mining filling as the main processes. This paper summarizes the technical characteristics and classification of coal based solid waste filling and mining, represented by gangue and fly ash. The basic physical and chemical properties of solid wastes such as coal gangue, fly ash, slag, gasification slag, and desulfurization gypsum indicate that coal based solid waste has the feasibility of being used as filling materials. The compression characteristics of gangue solid and paste filling materials are summarized, and the characteristics of the two main filling and mining processes, continuous mining and charging and comprehensive mining filling, are analyzed. Prospects are made in expanding the range of coal based solid waste filling materials, improving the production capacity of filling and mining, and reducing filling costs, in order to provide ideas for the future development of coal based solid waste filling and mining.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1693K]

  • Synergistic Enhancement Effect of Coal Gangue, Fly Ash and Slag in Cementbased Materials

    WANG Haigang;DONG Zhiyu;LI Guilin;GUO Jiadong;XIA Haojie;KONG Shaoqi;China University of Mining and Technology;Jinneng Holdings Lu'an Chemical Group Co., Ltd.;Taiyuan University of Technology;

    Coal gangue, as a coal-based solid waste, has attracted widespread attention for its resource utilization. In this study, the activity of clayey coal gangue was enhanced through calcination activation and combined with fly ash and slag to study the synergistic enhancement effect of the three materials in cement-based materials. The working properties and mechanical properties of the composite cement mortar were evaluated by using the fluidity test and the compressive/flexural strength test. The activation mechanism of coal gangue, the hydration products and hydration kinetics of composite cement slurry were analyzed by X-ray diffraction(XRD) and heat of hydration. The results showed that with increasing calcination temperature, the activity of coal gangue first increased and then decreased, with the optimal calcination temperature between 700–800?℃. When fly ash, slag, and coal gangue(calcined at 700?℃) were combined in a ratio of 5∶2∶3, the fluidity of the cement mortar reached 237?mm, the 28 day compressive strength was 48.96?MPa, and the 28-day activity index reached 104.77%. Specifically, the spherical particles of fly ash mainly played a lubricating role,significantly improving the fluidity of the mortar; coal gangue provided a large amount of active SiO2, promoting hydration reactions and the formation of hydration products; slag, with high pozzolanic activity and fine particle size, provided more nucleation sites, enhancing the early strength of the mortar. All three materials all play the role of lubricants and nucleation sites to varying degrees, achieving synergistic improvements in fluidity enhancement, hydration reaction promotion,hydration product optimization, and complementary active components, thereby enhancing the performance of cement-based materials. This study provides a new approach and theoretical basis for the application of coal gangue in cement-based materials.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1568K]

  • Research Progress on the Preparation of High-Value Products with Iron Ore Tailings

    FU Pingfeng;DENG Wei;YU Zeen;ZHANG Siqi;NI Wen;School of Civil and Resources Engineering, University of Science and Technology Beijing;Key Laboratory of the Ministry of Education for Efficient Mining and Safety of Metal Mines;

    With the implementation of China's green development strategy, the resource utilization of iron ore tailings has become increasingly important. Nowadays, iron ore tailings are widely used to prepare construction materials such as building sand and mineral admixtures. Their resource potential is not fully developed, and the preparation of high-value products would become future research hotspots. This work reviews the research progress on the preparation of high-value novel materials from iron ore tailings, including novel construction materials such as glass-ceramics, foamed ceramics,composite ceramics, black vitrified bricks, thermal insulation composites, and microwave absorbing glass-ceramic tile,siliceous mesoporous materials, high purity quartz sand and agricultural soil amendment. Based on the mineral composition and characteristics of iron ore tailings, the challenges faced in the production of high-value novel materials are discussed.To promote the efficient utilization of iron ore tailings, it is recommended that suitable utilization modes should be explored based on the types of iron ore tailings. Large-scale utilization and high-value utilization should be considered simultaneously in the tailings resource process, to achieve both the high utilization rate of iron ore tailings and added-value of products. Thus, dual economic and environmental benefits can be obtained in resource utilization of iron ore tailings.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1116K]

  • Research Progress on the Utilization of Iron Tailings as Building Materials

    SHI Da;REN Xuemei;HAO Tingyu;ZHANG Run;Central Research Institute of Building and Construction MCC Co., Ltd;

    Iron tailings are the main solid waste produced in the process of iron ore development, and the utilization of iron tailings as building materials is one of the important directions for its large-scale consumption. Based on the physical and chemical characteristics of iron tailings, the research progress in the preparation of building materials from iron tailings at home and abroad is reviewed, including:(1) cement;(2) concrete, mainly as artificial coarse/fine aggregate, or as a cementing material after activation treatment;(3) brick materials, such as sintered brick, autoclaved brick, ceramic brick,permeable brick, and steam-free and burn-free brick;(4) wall materials, including concrete wall materials, new wall materials such as sound insulation materials and thermal insulation materials;(5) ceramic materials, such as porcelain tile,glass ceramics, and foamed ceramics;(6) road materials, including subgrade filling material, road base course, and subbase course. The major problems and future development trends of iron tailings in building materials applications are analyzed.Due to the characteristics of iron tailings, such as large particle size range, fine particle size in some parts, poor grading,poor activity, large performance fluctuation and large difference in properties of different iron tailings, there are some problems in the process of building materials utilization, such as small dosage, high treatment cost and poor product performance. According to the characteristics of iron tailings, an efficient and simple production process route is proposed.It is urgent to further reduce the production cost and improve the product value.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1081K]

  • Technology, Mechanism, and Application Progress for Ceramsite Prepared by Iron Tailings

    LI Xingzhen;LI Guofeng;LIU Liwei;LI Yanfeng;College of Mining Engineering, North China University of Science and Technology;

    The iron tailings is widely distributed in China and stockpiled in large volume, which results in serious problems including land occupation and environmental pollution. The iron tailings-based ceramsite, a kind of lightweight aggregate, is characterized by lightweight and high strength, low water absorption, and well frost-resistance, and can be used in building materials, horticulture, and water treatment. The types of ceramsite and the feasibility of using iron tailings as raw material for preparing ceramisite was discussed in this paper. Then, the preparation technologies for roasted ceramisite and unfired ceramisite were introduced and the products performance were compared. The reaction mechanisms for iron tailings-based ceramisite in roasting and no-firing processes were also analyzed. Furthermore, the formation principle of pore structure for iron tailings-based ceramisite and its research status were concluded. Finally, the problems that need to be solved in future and the development direction were put forward basing application status of iron tailings-based ceramisite. Overall, preparation of ceramsite using iron tailings has great significance to promote the recycling of iron tailings resources and environmental protection of mine.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 934K]

  • Flocculation Effect of Ferric Chloride on Ultra-fine Tailings

    NIU Fusheng;CHEN Yuying;ZHANG Jinxia;LIU Fei;North China University of Science and Technology;Hebei Province Mining Industry Develops with Safe Technology Priority Laboratory mining industry develops with safe technology priority laboratory;

    With the advancement of mineral processing technology, the diameter of tailings is getting smaller and smaller,even reaching the ultra-fine level. In order to realize the high concentration filling of ultrafine tailings in the concentrator,the flocculation settling and thickening of ultrafine tailings is the critical technology. Therefore, the flocculation of certain ultrafine iron tailings was studied with ferric chloride produced from iron and steel hydrochloric acid pickling waste liquor as a flocculant. The effects of ferric chloride dosage, stirring speed, and stirring time on the flocculation of ultra-fine iron tailings were investigated using an industrial CCD camera and image processing software(Image-Pro Plus). The experimental results show that when the amount of FeCl3 was 2 700 g/t, the speed of the magnetic stirrer was 800 r/min, the stirring time was 80 s, the particle size of the floc was 39.79 μm, and the fractal dimension was 1.92. Based on the Box-Behnken principle, response surface methodology was used to establish the multiple regression equation of the interaction among the amount of flocculant FeCl3, stirring speed, and stirring time on the flocculation of ultra-fine tailings,and ANOVA was used to analyse the experimental results. The results showed that the optimum conditions were 2 763.74g/t of ferric chloride, 832.76 r/min of stirring speed, 95.89 s of stirring time, and 40.28 μm of floc particle size, and 1.92 of fractal dimension predicted by the model, which were consistent with the experimental results. The effect law of superfine tailings is obtained by studying flocculation conditions, which provides theoretical support for the practice of highefficiency flocculation of superfine tailings. This study also realize the comprehensive utilization of waste acid, which is conducive to energy saving and emission reduction and reduces the cost of industrial production.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1027K]

  • Experimental Study on Refined Flocculation and Settlement Parameters of Ultrafine Unclassified tailings from Yinshan Mine

    DING Jiaduo;LI Hongpeng;SONG Zian;CHEN Qiusong;Yinshan Mining Co., Ltd Jiangxi Copper Group;School of Resources and Safety Engineering, Central South University;

    The tailings from the Yinshan Mine contain approximately 51% ultrafine particles of less than 19 μm,presenting significant challenges to the thickening and dewatering processes. In particular, the effectiveness of deep cone thickeners is particularly affected by seasonal variations and the quality and concentration of the tailings feed. In order to improve the settlement performance of the deep cone thickener at the Yinshan Mine. Comprehensive experiments were conducted, including physical and chemical property tests, laboratory-scale flocculation settlement experiments, and semi-industrial experimental focusing on the flocculation of ultrafine unclassified tailings. The results showed that DR1030proved to be the optimal flocculant. At a tailings slurry concentration of 10%, the consumption of DR1030 was30.0 g/t in summer and 33.0 g/t in other seasons; at a 15% slurry concentration, the consumption was 35.0 g/t in summer and 38.0 g/t in other seasons. Under semi-industrial experimental conditions, the actual consumption of DR1030 was34.0 g/t, which was 4.4 g/t less than that of the existing flocculants. Furthermore, the underflow concentration with DR1030exhibited more stable and higher mass concentration, which was improved by 2.6%. Slump flow measurement demonstrated that DR1030 had no significant effect on the fluidity of the slurry. This study provides critical process parameters that can improve cemented paste backfill quality at the Yinshan Mine, as well as valuable insights for similar mining operations.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1295K]

  • Comprehensive Recovery of Cu and Mo from Molybdenum Cleaner Tailings by Selective Flocculation Flotation

    PENG Weijun;LYU Shuai;LUO Weizhe;QI Mengyao;ZHANG Longyu;CHEN Xianggen;CHAO Yande;WANG Wei;Zhongyuan Critical Metals Laboratory (Zhengzhou University), Zhengzhou University;The Key Lab of Critical Metals Minerals Supernormal Enrichment and Extraction, Ministry of Education;School of Chemical Engineering, Zhengzhou University;Luanchuan Longyu Molybdenum Industry Co., Ltd;School of Chemical Engineering and Technology, China University of Mining and technology;

    The granularity of a molybdenum cleaner tailings from Henan Province was fine, with-23 μm grade accounting for 65%. The Cu and Mo grades of the tailings were 0.20% and 0.08%, respectively, which had a certain recovery value. PADD flocculant was synthesized by introducing hydrophobic monomer-dodecyl gluconide on acrylamide, which had a good hydrophobicity. In the work, PADD was used as flocculant to recovery fine Cu-Mo sulfide ore from the molybdenum cleaner tailings via selective flocculation flotation. Under the conditions of pulp pH 4.2, the dosages of sodium hempetaphosphate, PADD, cupric sulfate, kerosene, ethylthiamine and 2# oil were 500 g/t, 150 g/t, 100g/t, 170 g/t, 151 g/t and 60 g/t, respectively, the closed circuit of once roughing flotation, once scavenging flotation, twice cleaning flotation, and the middles I, II and III were combined return to the roughing flotation were performed. The obtained final mixed concentrate had the Cu grade of 12.054%, Cu recovery of 89.98%, Mo grade of 3.214%, and Mo recovery of 64.20%, which efficiently comprehensive recovered the valuable Cu and Mo from the molybdenum cleaner tailings. Based on the strong hydrophobicity, PADD selectively flocculated micro-fine copper molybdenum sulfide ore mainly through the hydrophobic force, and then significantly improved the selective flocculation flotation effect of micro-fine copper molybdenum sulfide ore in molybdenum tailings.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1135K]

  • Preparation of Potassium-Silicon Soil Conditioner from Ultrafine Molybdenum Tailings by Alkali Activation-Hydrothermal Method

    WANG Jing;WANG Bo;CAO Jinnan;XIAO Xiao;ZHAO Di;CHEN Zhenya;Chinese Academy of Geological Sciences;

    In response to the challenges of high difficulty and low comprehensive utilization rate when conventionally using ultrafine molybdenum tailings for the preparation of building materials, a technical approach combining alkali activation and hydrothermal method to prepare soil conditioners has been proposed. Molybdenum tailings are used as the main raw material, with quicklime, KOH, and others as activators to prepare soil conditioners under hydrothermal conditions. The study investigated the impact of factors such as the mass concentration of KOH, the mass ratio of tailings to lime, the mass ratio of straw to tailings, the mass-volume ratio of mixed dry materials to alkaline solution, hydrothermal reaction time, and hydrothermal reaction temperature on the production of soluble Si and K elements. The results showed that under the conditions of KOH concentration of 0.5 mol/L, mass ratio of tailings to lime of 1∶0.8, mass ratio of straw to tailings of 1 : 70, mass-volume ratio of mixed dry materials to alkaline solution of 100 g∶300 mL, hydrothermal reaction time of 9 hours, and hydrothermal reaction temperature of 180 ℃, the prepared soil conditioner had soluble Si and K contents of 8.9% and 6.85%, respectively, meeting the requirements for Si and K elements in "Silicon-Calcium-Potassium-Magnesium Fertilizer"(GB/T 36207—2018). Under the combined action of alkali activation and hydrothermal method, the silicate minerals in the tailings undergo depolymerization and condensation reactions,activating the reactivity of elements such as Si, K, and Al. The prepared soil conditioner samples meet the national standard requirements for soluble Si and K elements; they form a network structure with strong adsorption capacity. This research result will be of great significance for the comprehensive utilization of molybdenum tailings in China, and for the sustainable development of agricultural production.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 938K]

  • Experimental Study on Ceramic Raw Material Preparation with Coarse-grained Gold Tailings and Cemented Filling with Fine-grained Gold Tailings

    ZHOU Wentao;GAO Wenhao;LYU Xianjun;WANG Junxiang;ZHANG Hui;State Key Laboratory of Mineral Processing Science and Technology Mining and Metallurgy Technology Group Co., Ltd.;School of Energy and Mining Engineering, Shandong University of Science and Technology;School of Chemistry and Bioengineering, Shandong University of Science and Technology;Teacher Development Research Center of Education and Sports Bureau of Guancheng Hui Autonomous Region;

    This study investigates the utilization of gold tailings as raw materials through a process involving classification and magnetic separation. The specific approach involves “ coarse-fine classification—coarse particle preparation for ceramic raw materials, fine particle filling.” The results demonstrate that effective classification can be achieved using a Φ150mm cyclone with a feed concentration of 28.28%, resulting in an underflow with +325 mesh content of 92.83% and an overflow with-325 mesh content of 96.09%. After undergoing a two-stage magnetic separation process(weak magnetic separation followed by strong magnetic separation), the underflow yields feldspar-quartz product with a whiteness of 59.09%, iron oxide content of 0.15%, and a recovery rate of 58.98%. This process effectively improves the quality, removes iron impurities, and enhances the whiteness of the product, meeting the industry standards for ceramic porcelain. Regarding the overflow material, a slurry concentration of 65% or higher and a cement-sand ratio of 1:10 can meet the requirements for cemented filling, achieving a compressive strength of 1 MPa after 28 days. The findings of this research can guide the resource utilization of gold tailings.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 921K]

  • Experimental Study on Particle Grading Priority of Waste Rock-Slurry Bonding Filling in Xifeng Phosphate Mine

    LIU Defeng;XIONG Zhiyang;ZHENG Yantao;REN Jinhua;WANG Liangqun;ZHU Fuxing;Wuhan Institute of Technology;Guizhou Xi feng Phosphate Rock Corporation Limited;Guizhou Chemical Construction Co., Ltd.;Guizhou Zijin Mining Co., Ltd.;

    To reduce the cost of filling and the potential safety hazards caused by the accumulation of waste rock in the waste dump, the waste rock-slurry cemented filling process is adopted in Xifeng Phosphorite Mine. Through a combination of research methods such as the response surface method, technical and economic analysis and microstructure characterization, the sensitivity of the main influencing factors was analyzed. Besides, the filling ratio parameters were optimized, and the mechanism of the hydration products was revealed. The research results indicated that the sensitivity of the influencing factors of the uniaxial compressive strength of the filling body is in the order of slurry concentration>cement to fly ash mass ratio > ash to rock ratio. Under the conditions of 55% slurry concentration,ash-to-rock ratio of 7∶20, and cement-to-fly ash ratio of 87∶100, the strength of the filling body reaches 10.60 MPa,saving a total cost of over 1.31 million yuan/100,000 t of filling material per year. The pore structure of the optimized filling bodies is filled with hydration products such as calcium silicate(C-S-H), calcium hydroxide(CH) and alumina(AFt) in combination with fly ash that is not involved in the hydration reaction. The microstructure is dense and has strong resistance to external compression damage. The research results can provide a theoretical basis and technical support for the safe mining of open-pit to underground filling.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1814K]

  • Optimization of Waste Rock-Tailings Cemented Backfill Mix Proportion Based on RSM-BBD

    LIAO Yucheng;FU Kaibin;ZOU Wen;LIU Xun;GONG Yongchao;OU Renze;CHEN Shu;YANG Yuankun;JING Xiaoyan;YANG Dehua;School of Environment and Resources, Southwest University of Science and Technology;Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education;Sichuan Liwu Copper Co., Ltd.;Jiulong County Yalongjiang Mining Co., Ltd.;Changsha Institute of Mining Research Co., Ltd.;

    To address the issue of low strength in cemented fully tailings backfill and the susceptibility to pipe blockage during high-concentration filling, a mixed aggregate composed of waste rock and tailings as an alternative to single tailings aggregate for underground filling. In order to determine the optimal ratio of filling slurry, the physical and chemical properties of filling materials were characterized, and the grading of waste rock aggregate according to the Talbol theory.using the Box-Behnken central composite design and Response Surface Methodology(RSM) in the Design-Expert software, the effects of tailings-to-binder ratio, waste rock mass fraction, and slurry mass concentration on the mechanical strength of the filling body and the flowability of the filling slurry were systematically investigated. A ternary quadratic regression model was then established, taking the compressive strength and flowability of the filling slurry at different curing ages as response values, and its applicability was validated. The results revealed that the interaction between the tailings-to-binder ratio and slurry mass concentration significantly influenced the strength of the filling body, while the interaction between the waste rock mass fraction and slurry mass concentration prominently affected the flowability of the filling slurry. By setting the minimum filling cost as the optimization objective, a conditionally constrained model was established, yielding optimized filling slurry proportions of a 7∶1 tailings-to-binder ratio, 70% waste rock mass fraction,84% slurry mass concentration, with a slurry consistency of 114 mm and a 28 day compressive strength of 5.13 MPa. These optimized proportions meet the requirements for both filling body strength and slurry flowability in mining applications.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1312K]

  • Flotation Purification of Phosphogypsum and Preparation of β-hemihydrate Gypsum

    DONG Xiongbo;YE Guangli;NIU Mengyuan;ZHANG Cheng;ZHANG Jun;YANG Huaming;Engineering Research Center of Nano-Geomaterials of Ministry of Education;School of Materials and Chemistry, China University of Geosciences (Wuhan);School of Minerals Processing and Bioengineering, Central South University;Hunan Key Laboratory of Mineral Materials and Application, Central South University;

    The large-scale stockpiling of phosphogypsum poses a significant environmental challenge, mainly due to its high impurity content and low whiteness, which critically limit its potential for high-value applications. This study investigated phosphogypsum from a plant in Hubei Province, integrating process mineralogy with graded flotation for efficient purification. The results showed that the use of hydrochloric acid, water glass, collector ZX-4-4 and frother Q1 in a closed circuit flotation process-consisting of one rougher flotation, two cleaner flotations and a sequential middle return-significantly improved the quality of the material. Specifically, the CaSO_4-2H_2O content of the phosphogypsum was increased from 89.65% to 98.15%, while the whiteness improved from 37.10% to 52.44%. The overall recovery rate reached 83.47% with a significant reduction in impurities: silica content decreased from 6.16% to 0.58% and iron content was minimized to 0.006 2%. The whiteness of the β-hemihydrate gypsum produced by direct calcination of the purified phosphogypsum exceeded 80%, significantly exceeding the first grade specifications of the national standard GB/T 23 456-2018 for phosphogypsum. Thus, the flotation process significantly improved both the quality of the phosphogypsum and the performance of the derived products.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1135K]

  • Study on the Process of Phosphogypsum Floatation Coupled with Acid Leaching for Impurity Removal and Whitening

    GUO Wanxin;DONG Wanqiang;DENG Xiangyi;CHI Ruan;CHEN Zhuo;SUN Ningjie;Wuhan Institute of Technology, College of Resource and Safety Engineering;Wuhan Quqing Engineering Consulting Co., Ltd.;Hubei Three Gorges Laboratory Phosphogypsum Utilization Research and Development Center;

    Phosphogypsum, a bulk solid waste generated from the wet phosphoric acid process, is primarily disposed of through centralized stockpiling, which poses significant environmental risks. This study investigates the flotation and acid leaching conditions for phosphogypsum sourced from a phosphate fertilizer producer in Hubei, China. Optimal results were achieved under the following conditions: dodecylamine dosage of 200 g/t, slurry pH of 2.0, sulfuric acid concentration of 5%, liquid-solid ratio of 5:1, leaching time of 2 hours, and temperature of 35 ℃. The treated phosphogypsum exhibited a whiteness of over 70%, a CaSO_4·2H_2O purity exceeding 97%, and reduced soluble phosphorus and fluorine contents to0.098% and 0.052%, respectively. FT-IR spectra, zeta potential, and surface tension analyses revealed that dodecylamine interacts with phosphogypsum surfaces through hydrogen bonding and physical adsorption. Additionally, the flotation process significantly decreased the silicon dioxide content in the concentrate. This method demonstrates simplicity, strong applicability, and potential to provide high-quality raw materials for the value-added utilization of phosphogypsum.

    2024 06 v.44;No.254 [Abstract][OnlineView][Download 1239K]