Minerals Engineering最新文献

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Efficient recovery of chromium from electroplating sludge by a two-step roasting process: Mechanisms and kinetics 用两步焙烧法从电镀污泥中高效回收铬:机理和动力学
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-24 DOI: 10.1016/j.mineng.2025.109795
Chengbin Zhong , Junxia Yu , Boxi Wu , Jia Wang , Li Guo , Ruan Chi , Zhen Luo , YingYing Liu
{"title":"Efficient recovery of chromium from electroplating sludge by a two-step roasting process: Mechanisms and kinetics","authors":"Chengbin Zhong ,&nbsp;Junxia Yu ,&nbsp;Boxi Wu ,&nbsp;Jia Wang ,&nbsp;Li Guo ,&nbsp;Ruan Chi ,&nbsp;Zhen Luo ,&nbsp;YingYing Liu","doi":"10.1016/j.mineng.2025.109795","DOIUrl":"10.1016/j.mineng.2025.109795","url":null,"abstract":"<div><div>Electroplating sludge (ES), a hazardous industrial waste, poses environmental challenges due to its complex composition, high chromium (Cr) content, environmental toxicity, and its efficient treatment has become a pressing necessity. To address this issue, a novel two-step roasting process—Na<sub>2</sub>CO<sub>3</sub> roasting with water leaching for initial dechroming, followed by NaNO<sub>3</sub> roasting of the residue—was used to recover chromium from ES. Given the compositional complexity of ES, FactSage (Facility for the Analysis of Chemical Thermodynamics) was utilized to predict the thermodynamic behavior and phase transformation of the roasting process. Based on the prediction, roasting experiments were carried out at temperatures ranging from 500 to 1000 °C, and the phase transformation mechanisms during the roasting processes were verified by mineral liberation analysis (MLA) and X-ray diffraction (XRD) analysis. Results reveal that the total recovery efficiency of Cr reached 99 % under the optimal conditions of the two-step roasting process. Moreover, this study elucidated a systematic Cr-phase transition mechanism in ES, beginning with hydroxide formation, followed by transformation into oxides, spinel phases (FeCr<sub>2</sub>O<sub>4</sub>, MgCr<sub>2</sub>O<sub>4</sub>, ZnCr<sub>2</sub>O<sub>4</sub>, and CaCr<sub>2</sub>O<sub>4</sub>), and finally conversion into soluble Na<sub>2</sub>CrO<sub>4</sub>. Kinetic analysis further indicated that Cr(III) oxidation during Na<sub>2</sub>CO<sub>3</sub> roasting followed a product-layer diffusion mechanism with an apparent activation energy of 44.5 kJ/mol, supported by a strong linear correlation to the shrinking core model (R<sup>2</sup> &gt; 0.99) between 500–800 °C, while sintering-induced diffusion limitations emerged at higher temperatures. Overall, this work systematically clarified the Cr phase transformation mechanisms during the two-step roasting, offering theoretical insights and practical guidance for high-efficient and environmentally sustainable recovery of Cr from hazardous industrial wastes.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"235 ","pages":"Article 109795"},"PeriodicalIF":5.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145156345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research progress on the recovery of strategic metals lithium and gallium from coal-based solid wastes: from mineral deconstruction to resource utilization 从煤基固体废物中回收战略性金属锂和镓的研究进展:从矿物解构到资源化利用
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-24 DOI: 10.1016/j.mineng.2025.109775
Luodan Xiang, Ting’an Zhang
{"title":"Research progress on the recovery of strategic metals lithium and gallium from coal-based solid wastes: from mineral deconstruction to resource utilization","authors":"Luodan Xiang,&nbsp;Ting’an Zhang","doi":"10.1016/j.mineng.2025.109775","DOIUrl":"10.1016/j.mineng.2025.109775","url":null,"abstract":"<div><div>With the rapid expansion of the new energy vehicle and semiconductor industries, the demand for lithium and gallium resources has increased significantly. Coal and its solid wastes, particularly coal gangue (CG), coal fly ash (CFA), and coal gasification slag (CGS), are abundant and rich in lithium and gallium, thereby representing a potential source for these critical elements. This paper presents detection methods for identifying lithium-rich and gallium-rich phases in coal and its solid wastes, describes the lithium and gallium content in these materials, and analyzes their respective occurrence states. Currently, the technologies for recovering lithium and gallium from CG, CFA, and CGS primarily involve pretreatment, leaching, and extraction/separation processes. Pretreatment aims to release lithium and gallium by destroying the stable structure of their mineral phases through activation techniques such as thermal, mechanical, or chemical methods. Leaching technologies use acids, bases, water, or microbial metabolites (organic acids) to extract valuable elements from CG, CFA, and CGS. The extraction/separation of lithium and gallium from leachates mainly utilizes techniques such as solvent extraction, adsorption, precipitation, and ion imprinting. Furthermore, this paper evaluates the advantages and limitations of existing recovery methods through case studies and discusses prospects for developing synergistic extraction techniques targeting multiple elements from coal-based wastes. Finally, the presence of lithium and gallium in low-rank coal suggests the potential for future recovery of these elements from such sources.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"235 ","pages":"Article 109775"},"PeriodicalIF":5.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145156347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prediction of SAG mill liner wear and geometry optimization using interpretable machine learning 使用可解释性机器学习的SAG磨机衬套磨损预测和几何优化
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-24 DOI: 10.1016/j.mineng.2025.109793
Tingnian Yin, Yuhua Liu, Haoran Han, Pengfei Shi, Guilong Xiong
{"title":"Prediction of SAG mill liner wear and geometry optimization using interpretable machine learning","authors":"Tingnian Yin,&nbsp;Yuhua Liu,&nbsp;Haoran Han,&nbsp;Pengfei Shi,&nbsp;Guilong Xiong","doi":"10.1016/j.mineng.2025.109793","DOIUrl":"10.1016/j.mineng.2025.109793","url":null,"abstract":"<div><div>Geometric parameters are considered a critical factor influencing the wear of semi-autogenous grinding (SAG) mill liners. However, traditional liner design optimization studies only focus on single variables and incur substantial time and financial costs. Therefore, this paper proposes a framework that integrates the discrete element method (DEM) with interpretable machine learning and that offers an effective approach to address this issue. In this study, a dataset was constructed based on the numerical simulation results using the DEM. Subsequently, four machine learning models were constructed to predict the wear volume (W). The SHapley Additive exPlanations (SHAP) method was employed to interpret the best prediction model for identifying the response relationship between liner geometric parameters and W. The results showed that variations in the geometric parameters of lifters exhibit complex and nonlinear effects on liners wear. The best W prediction model is the multilayer perceptron (MLP) model with superior accuracy, stability and generalizability. The face angle emerged as the most significant geometric factor influencing liner wear with a relative importance of 48.1 %. Optimal lifter designs should prioritize the following geometric parameter intervals: Face angle &lt; 50.57°, Height &lt; 186.09 mm, Width &lt; 91.27 mm, and Number &lt; 33. The findings of this study indicate that interpretable machine learning combined with DEM provides a promising technique for liner design.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"235 ","pages":"Article 109793"},"PeriodicalIF":5.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145156825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New insights into first-principles assessment of crystallographic plane fracture in minerals: Case studies on representative surfaces of Ilmenite, diopside, and olivine 矿物晶体面断裂第一性原理评估的新见解:钛铁矿、透辉石和橄榄石代表性表面的案例研究
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-23 DOI: 10.1016/j.mineng.2025.109791
Min Wei , Runqing Liu , Jian Cao , Jianyong He , Wei Sun , Yijun Cao
{"title":"New insights into first-principles assessment of crystallographic plane fracture in minerals: Case studies on representative surfaces of Ilmenite, diopside, and olivine","authors":"Min Wei ,&nbsp;Runqing Liu ,&nbsp;Jian Cao ,&nbsp;Jianyong He ,&nbsp;Wei Sun ,&nbsp;Yijun Cao","doi":"10.1016/j.mineng.2025.109791","DOIUrl":"10.1016/j.mineng.2025.109791","url":null,"abstract":"<div><div>The mechanisms of cleavage and crystal plane exposure in mineral crystals are crucial for accurately identifying exposed mineral surfaces. Currently, both fracture energy density (S<sub>c</sub>) and surface energy (γ<sub>s</sub>) can indicate the relative ease of cleavage along different crystal planes for simple A<sub>n</sub>B<sub>m</sub>-type minerals. However, when predicting the exposed surfaces of complex crystal minerals with multiple types of chemical bonds and varying bond quantities within the unit cell, the methods based on fracture energy density and surface energy are somewhat insufficient. Therefore, there is a pressing need to explore a more efficient and reliable approach. This paper uses the typical crystal plane of ilmenite, diopside, and olivine as examples. By applying first-principles calculations, it proposes a crystal plane fracture energy calculation method based on surface energy. This method can quickly and accurately assess the fracture ease of various minerals along different crystal planes, reveal the exposure patterns of terminal surfaces on the crystal planes, and provide a universal and precise approach for predicting the properties of exposed mineral crystal surfaces.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"234 ","pages":"Article 109791"},"PeriodicalIF":5.0,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145117646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanism of molecular Synergy in the Aerophine 3418A-DTP mixed Collector: Insights into hydrophobicity and non-polar group interactions for chalcopyrite flotation Aerophine 3418A-DTP混合捕收剂的分子协同作用机制:黄铜矿浮选的疏水性和非极性基团相互作用
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-22 DOI: 10.1016/j.mineng.2025.109787
Yingchao Liu , Zhixiang Chen , Jingqiao Li , Jianhua Chen , Liang Zhao , Yuqiong Li , Qingxia Liu
{"title":"Mechanism of molecular Synergy in the Aerophine 3418A-DTP mixed Collector: Insights into hydrophobicity and non-polar group interactions for chalcopyrite flotation","authors":"Yingchao Liu ,&nbsp;Zhixiang Chen ,&nbsp;Jingqiao Li ,&nbsp;Jianhua Chen ,&nbsp;Liang Zhao ,&nbsp;Yuqiong Li ,&nbsp;Qingxia Liu","doi":"10.1016/j.mineng.2025.109787","DOIUrl":"10.1016/j.mineng.2025.109787","url":null,"abstract":"<div><div>To investigate the synergistic enhancement mechanism of the 3418A-DTP mixed collector in the flotation process of chalcopyrite, multiscale analytical methods of atomic force microscopy (AFM), first-principles molecular dynamics (MD), and scanning electron microscopy/energy-dispersive spectroscopy (SEM-EDS) were adopted to systematically explore the molecular mechanism of hydrophobicity enhancement and interactions between the non-polar groups of the collector. The AFM bubble probe technology revealed that the adsorption of the mixed collector increased the density of hydrophobic points on the mineral surface by 35.4%, reaching the maximum hydrophobic area and effectively improving the adhesion between bubbles and minerals. Theoretical calculations further confirmed that the interaction force between the non-polar groups of the 3418A-DTP mixed collector was strengthened, leading to notable hydrophobicity enhancement. It was observed from first-principles calculations that the tightly arranged non-polar functional groups of the collector formed a dense hydrophobic layer on the mineral surface to block water permeation. It was noticed from classical MD simulations that the contact angle of the mixed collector after adsorption increased by 6.2–7.0° compared to that of a single collector, confirming the synergistic strengthening effect.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"234 ","pages":"Article 109787"},"PeriodicalIF":5.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145103929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient leaching of Li from coal fly ash and application of leaching residue for removal of Cu(ii) from wastewater: New waste-to-value approach 煤飞灰中Li的高效浸出及浸出渣去除废水中Cu(ii)的应用:新的废物价值转化方法
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-22 DOI: 10.1016/j.mineng.2025.109790
Zhan Ding , Lin Li , Kaiyun Yang , Chang Liu
{"title":"Efficient leaching of Li from coal fly ash and application of leaching residue for removal of Cu(ii) from wastewater: New waste-to-value approach","authors":"Zhan Ding ,&nbsp;Lin Li ,&nbsp;Kaiyun Yang ,&nbsp;Chang Liu","doi":"10.1016/j.mineng.2025.109790","DOIUrl":"10.1016/j.mineng.2025.109790","url":null,"abstract":"<div><div>Coal fly ash (CFA), a significant industrial solid waste, presents environmental challenges, while the management of heavy metal contaminated water remains a global concern, and lithium (Li) plays an irreplaceable role in supporting global economic and technological progress. Consequently, to overcome the double challenge of limited supply of strategic metals and environmental threats, a sustainable process for the efficient leaching of lithium from CFA (LRCFA) and removal of Cu(<span>ii)</span> from electroplating wastewater using leaching residue was developed in this study. Roasting leaching experiments demonstrated that the leaching efficiency of elemental Li was as high as 95.33 % under the most favorable experimental conditions. Environmental risk assessment confirmed that the leachability of heavy metals from all solid residues met relevant environmental standards, ensuring their environmental safety. The adsorption and removal of Cu(<span>ii)</span> from LRCFA were significantly better than that from CFA and roasting residue (RCFA) at pH 6–7. The adsorption of Cu(<span>ii)</span> on LRCFA was in accordance with the proposed pseudo-second-order kinetics and Langmuir model, and the maximum adsorption of Cu(<span>ii)</span> was 41.76 mg/g. The results of the mechanistic analyses exhibited that the roasting of NaCl disrupted the CFA structure and enhanced the leachability of Li, while the Si-O-Al framework of the generated LRCFA promoted the binding of Cu(<span>ii)</span> through ion exchange and complexation with surface functional groups. This work demonstrates the valuable utilization of solid waste for critical metal recovery and wastewater remediation.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"234 ","pages":"Article 109790"},"PeriodicalIF":5.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145117647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence and optimization of hydrogen-based mineral phase transformation on grinding characteristics of polymetallic oxide and recovery of valuable elements by response surface methodology 响应面法优化氢基矿物相变对多金属氧化物磨矿特性及有价元素回收的影响
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-22 DOI: 10.1016/j.mineng.2025.109789
Pengcheng Tian , Peng Gao , Zhidong Tang , Yanjun Li , Yuexin Han
{"title":"Influence and optimization of hydrogen-based mineral phase transformation on grinding characteristics of polymetallic oxide and recovery of valuable elements by response surface methodology","authors":"Pengcheng Tian ,&nbsp;Peng Gao ,&nbsp;Zhidong Tang ,&nbsp;Yanjun Li ,&nbsp;Yuexin Han","doi":"10.1016/j.mineng.2025.109789","DOIUrl":"10.1016/j.mineng.2025.109789","url":null,"abstract":"<div><div>The complex polymetallic ore of Bayan Obo is rich in valuable elements, but difficult to utilize. Hydrogen-based mineral phase transformation (HMPT) is an efficient and eco-friendly technology for processing refractory ores. In this study, the process parameters of HMPT were optimized using response surface methodology (RSM). The effects of reaction temperature, reaction time, and H<sub>2</sub> concentration on grinding efficiency, energy consumption, and iron recovery were studied using Box-Behnken Design (BBD). The phase transformation and microstructural characteristics of the ore were analyzed. The results indicate that temperature and H<sub>2</sub> concentration are key factors influencing specific power consumption in grinding and iron recovery rate. Using the characteristic parameter <em>T</em>, which represents the ratio of specific power consumption to iron recovery rate, as the evaluation index, the optimal HMPT conditions were determined: temperature of 500℃, time of 20 min, and H<sub>2</sub> concentration of 30 %. XRD and SEM-EDS analysis results indicate that after HMPT treatment, hematite is more likely to transform into magnetite, and additional cracks appear on the surface of the mineral particles, explaining the improved grinding and separation effects. This provides theoretical guidance for the low-energy consumption and high-efficiency HMPT processing in the industrialization of complex polymetallic ore.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"234 ","pages":"Article 109789"},"PeriodicalIF":5.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145117645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhanced high-gradient magnetic separation of copper-bearing limonite using elliptical magnetic matrix: Structural optimization and mechanism analysis 椭圆磁基质强化含铜褐铁矿高梯度磁选:结构优化及机理分析
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-22 DOI: 10.1016/j.mineng.2025.109785
Hanyu Wang , Wenbo Li , Yuexin Han
{"title":"Enhanced high-gradient magnetic separation of copper-bearing limonite using elliptical magnetic matrix: Structural optimization and mechanism analysis","authors":"Hanyu Wang ,&nbsp;Wenbo Li ,&nbsp;Yuexin Han","doi":"10.1016/j.mineng.2025.109785","DOIUrl":"10.1016/j.mineng.2025.109785","url":null,"abstract":"<div><div>This study designed and fabricated elliptical magnetic matrix with various structural parameters to achieve enrichment and separation of copper-bearing limonite. Compared with the conventional cylindrical magnetic matrix, the use of an elliptical magnetic matrix in roughing increased iron recovery by 2 %∼3% and improved iron grade by 1 %∼2%. Under a magnetic field of 0.6 T, with a major axis length of 3.2 mm, a rod gap of 2.4 mm, and horizontal alignment of the major axis, a magnetic concentrate with 54.29 % Fe grade and 63.11 % recovery was obtained. Product characterization revealed that elliptical magnetic matrix exhibited superior efficiency in recovering fine-grained minerals. Under high-gradient magnetic fields, strongly magnetic iron minerals were preferentially captured into the magnetic concentrate, with approximately 50 % of the copper co-enriched due to its strong association with iron phases. Magnetic field characteristics analysis showed that increasing the major axis length enhanced the edge magnetic gradients but reduced the effective capture area. Compared with the short-axis horizontal alignment, the long-axis horizontal alignment produced stronger magnetic induction, while larger gaps weakened magnetic coupling and decreased field strength. An optimized “one-stage roughing, one-stage scavenging” process achieved 48.12 % Fe grade, 2.09 % Cu grade, 92.34 % Fe recovery, and 75.48 % Cu recovery at field strengths of 0.6 T (roughing) and 1.0 T (scavenging). Magnetic tailings can be directly leached for copper, while the concentrate can be further processed via hydrogen-based mineral phase transformation. This work provides theoretical and technical support for the magnetic separation of complex oxidized copper ores.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"234 ","pages":"Article 109785"},"PeriodicalIF":5.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145117644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation on the hydration mechanism and water resistance of anhydrous-hemihydrate phosphogypsum-slag compound material 无水-半水磷石膏-渣复合材料水化机理及耐水性研究
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-19 DOI: 10.1016/j.mineng.2025.109784
Junlin An , Guangcheng Long , Yutong Zhang , Ning Li
{"title":"Investigation on the hydration mechanism and water resistance of anhydrous-hemihydrate phosphogypsum-slag compound material","authors":"Junlin An ,&nbsp;Guangcheng Long ,&nbsp;Yutong Zhang ,&nbsp;Ning Li","doi":"10.1016/j.mineng.2025.109784","DOIUrl":"10.1016/j.mineng.2025.109784","url":null,"abstract":"<div><div>To promote the resource utilization of phosphogypsum solid waste, new compound materials (PGSCM) were developed using anhydrous phosphogypsum (APG), hemihydrate phosphogypsum (HPG) derived from phosphogypsum (PPG), ground granulated blast-furnace slag (GGBS) and Ca(OH)<sub>2</sub>. This paper focused on investigating the hydration mechanism and water resistance of PGSCM by combining a series of experiments including compressive strength, water resistance, thermogravimetric analysis (TG-DTG) with molecular dynamics (MD) simulation. The results demonstrated that the setting process of PGSCM can be significantly influenced by HPG and APG. The addition of an appropriate dosage of HPG not only can be favors hydration and the setting process of PGSCM, but also enables maintaining a high compressive strength of 45 MPa, water absorption of less than 5 %, and a softening coefficient of approximately 0.85 at 28 days. The XRD and TG indicated that the addition of HPG can promote hydration and generate CaSO<sub>4</sub>·2H<sub>2</sub>O, contributing to compressive strength at an early age. The continuous hydration of GGBS forms substantial calcium silicate hydrate (C-S-H) gel, which enveloped both APG and CaSO<sub>4</sub>·2H<sub>2</sub>O. This physical encapsulation hindered their contact with water and OH<sup>−</sup> ions, thereby resulting in only a small fraction of APG being hydrated at 28 days. Molecular dynamics simulations revealed that the interaction energy of APG with Ca(OH)<sub>2</sub> solution was significantly higher than that with water, while Ca<sup>2+</sup> ions underwent rapid and substantial surface accumulation. Driven by the common ion effect, this synergistic mechanism markedly accelerated both the dissolution and crystallization processes of APG.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"234 ","pages":"Article 109784"},"PeriodicalIF":5.0,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145103930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synergistic extraction of molybdenum and tungsten from low-grade tungsten-molybdenum ores with poor flotation separability using a sodium hypochlorite-trisodium phosphate-sodium hydroxide system 次氯钠-磷酸三钠-氢氧化钠体系协同萃取浮选可选性差的低品位钨钼矿石中的钼钨
IF 5 2区 工程技术
Minerals Engineering Pub Date : 2025-09-19 DOI: 10.1016/j.mineng.2025.109760
Jian Kang , Linlin Tong , Qin Zhang , Han Zhao , Bin Xiong , Hongying Yang
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