Pub Date : 2024-09-01DOI: 10.1016/S1003-6326(24)66594-5
Qiang WANG , Meng WANG , Zong-yu FENG , Yong-qi ZHANG , Xiao-wei HUANG , Xiang-xin XUE
For a highly efficient recycling of a wastewater containing a high concentration of MgCl2, Al(III) and P507 were scheduled to be removed in advance. In this study, the in-situ removal of Al(III) and P507 from a high concentration MgCl2 solution at different pH values and Al/P molar ratios was investigated. The results showed that P507 formed organic complexes of Alx(OH)z+y-P507 at pH of 2.0−4.0. At pH of 4.0−5.0, Al(III) precipitated and transferred into Al(OH)3 with a flocculent amorphous morphology. Active sites on the Al(OH)3 surface enhanced the removal efficiency of P507. At pH of 6.0−6.5, Al(III) and Mg(II) formed layered crystalline Al(OH)3 and MgAl2(OH)8 with small pore channels and fewer active sites, resulting in a reduced removal efficiency of P507. When the Al/P molar ratio exceeded 13 and the pH was between 4.0 and 5.0, the removal rates of both Al(III) and P507 were higher than 98%, while the concentration loss of Mg(II) was only 0.2%−0.9%.
{"title":"Efficient removal of Al(III) and P507 from high concentration MgCl2 solution based on in-situ reaction strategy","authors":"Qiang WANG , Meng WANG , Zong-yu FENG , Yong-qi ZHANG , Xiao-wei HUANG , Xiang-xin XUE","doi":"10.1016/S1003-6326(24)66594-5","DOIUrl":"10.1016/S1003-6326(24)66594-5","url":null,"abstract":"<div><div>For a highly efficient recycling of a wastewater containing a high concentration of MgCl<sub>2</sub>, Al(III) and P507 were scheduled to be removed in advance. In this study, the in-situ removal of Al(III) and P507 from a high concentration MgCl<sub>2</sub> solution at different pH values and Al/P molar ratios was investigated. The results showed that P507 formed organic complexes of Al<sub><em>x</em></sub>(OH)<sup><em>z</em>+</sup><sub><em>y</em></sub>-P507 at pH of 2.0−4.0. At pH of 4.0−5.0, Al(III) precipitated and transferred into Al(OH)<sub>3</sub> with a flocculent amorphous morphology. Active sites on the Al(OH)<sub>3</sub> surface enhanced the removal efficiency of P507. At pH of 6.0−6.5, Al(III) and Mg(II) formed layered crystalline Al(OH)<sub>3</sub> and MgAl<sub>2</sub>(OH)<sub>8</sub> with small pore channels and fewer active sites, resulting in a reduced removal efficiency of P507. When the Al/P molar ratio exceeded 13 and the pH was between 4.0 and 5.0, the removal rates of both Al(III) and P507 were higher than 98%, while the concentration loss of Mg(II) was only 0.2%−0.9%.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 9","pages":"Pages 3042-3053"},"PeriodicalIF":4.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/S1003-6326(24)66573-8
Kai SUN , Lin WANG , Hang SU , Jia-yi GENG , Qiang ZHANG , Bo MENG , Zeng-yan WEI , Gao-hui WU
The damping properties were improved by preparing Al matrix composites reinforced with glass cenospheres through the pressure infiltration method. Transmission electron microscopy and scanning electron microscopy were employed to characterize the microstructure of the composites. The low-frequency damping properties were examined by using a dynamic mechanical thermal analyzer, aiming at exploring the changing trend of damping capacity with strain, temperature, and frequency. The findings demonstrated that the damping value rose as temperature and strain increased, with a maximum value of 0.15. Additionally, the damping value decreased when the frequency increased. Dislocation damping under strain and interfacial damping under temperature served as the two primary damping mechanisms. The increase in the density of dislocation strong pinning points following heat treatment reduced the damping value, which was attributed to the heat treatment enhancement of the interfacial bonding force of the composites.
{"title":"Damping properties and mechanism of aluminum matrix composites reinforced with glass cenospheres","authors":"Kai SUN , Lin WANG , Hang SU , Jia-yi GENG , Qiang ZHANG , Bo MENG , Zeng-yan WEI , Gao-hui WU","doi":"10.1016/S1003-6326(24)66573-8","DOIUrl":"10.1016/S1003-6326(24)66573-8","url":null,"abstract":"<div><div>The damping properties were improved by preparing Al matrix composites reinforced with glass cenospheres through the pressure infiltration method. Transmission electron microscopy and scanning electron microscopy were employed to characterize the microstructure of the composites. The low-frequency damping properties were examined by using a dynamic mechanical thermal analyzer, aiming at exploring the changing trend of damping capacity with strain, temperature, and frequency. The findings demonstrated that the damping value rose as temperature and strain increased, with a maximum value of 0.15. Additionally, the damping value decreased when the frequency increased. Dislocation damping under strain and interfacial damping under temperature served as the two primary damping mechanisms. The increase in the density of dislocation strong pinning points following heat treatment reduced the damping value, which was attributed to the heat treatment enhancement of the interfacial bonding force of the composites.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 9","pages":"Pages 2743-2755"},"PeriodicalIF":4.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/S1003-6326(24)66574-X
Zhi-bin LIU , Jia-bao BAO , Wen-jie HU , Hong YAN
The interfacial reaction behavior of Al and Ti3AlC2 at different pouring temperatures and its effect on the microstructure and mechanical properties of the composites were investigated. The results show that the addition of 3.0 wt.% Ti3AlC2 refines the average grain size of α(Al) in the composite by 50.1% compared to Al6061 alloy. Morphological analyses indicate that an in-situ Al3Ti transition layer of ~180 nm in thickness is generated around the edge of Ti3AlC2 at 720 °C, forming a well-bonded Al−Al3Ti interface. At this processing temperature, the ultimate tensile strength of Al6061−3.0 wt.%Ti3AlC2 composite is 199.2 MPa, an improvement of 41.5% over the Al6061 matrix. Mechanism analyses further elucidate that 720 °C is favourable for forming the nano-sized transition layer at the Ti3AlC2 edges. And, the thermal mismatch strengthening plays a dominant role in this state, with a strengthening contribution of about 74.8%.
{"title":"Microstructure, interfacial reaction behavior, and mechanical properties of Ti3AlC2 reinforced Al6061 composites","authors":"Zhi-bin LIU , Jia-bao BAO , Wen-jie HU , Hong YAN","doi":"10.1016/S1003-6326(24)66574-X","DOIUrl":"10.1016/S1003-6326(24)66574-X","url":null,"abstract":"<div><div>The interfacial reaction behavior of Al and Ti<sub>3</sub>AlC<sub>2</sub> at different pouring temperatures and its effect on the microstructure and mechanical properties of the composites were investigated. The results show that the addition of 3.0 wt.% Ti<sub>3</sub>AlC<sub>2</sub> refines the average grain size of <em>α</em>(Al) in the composite by 50.1% compared to Al6061 alloy. Morphological analyses indicate that an in-situ Al<sub>3</sub>Ti transition layer of ~180 nm in thickness is generated around the edge of Ti<sub>3</sub>AlC<sub>2</sub> at 720 °C, forming a well-bonded Al−Al<sub>3</sub>Ti interface. At this processing temperature, the ultimate tensile strength of Al6061−3.0 wt.%Ti<sub>3</sub>AlC<sub>2</sub> composite is 199.2 MPa, an improvement of 41.5% over the Al6061 matrix. Mechanism analyses further elucidate that 720 °C is favourable for forming the nano-sized transition layer at the Ti<sub>3</sub>AlC<sub>2</sub> edges. And, the thermal mismatch strengthening plays a dominant role in this state, with a strengthening contribution of about 74.8%.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 9","pages":"Pages 2756-2771"},"PeriodicalIF":4.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to enhance the mechanical properties of the selective laser-melted (SLM) high-Mg content AlSiMg1.4 alloy, the Zr element was introduced. The influence of Zr alloying on the processability, microstructure, and mechanical properties of the alloy was systematically investigated through performing microstructure analysis and tensile testing. It was demonstrated that the SLM-fabricated AlSiMg1.4−Zr alloy exhibited high process stability with a relative density of over 99.5% at various process parameters. Besides, the strong grain refinement induced by the primary Al3Zr particle during the melt solidification process simultaneously enhanced both the strength and plasticity of the alloy. The values for the yield strength, ultimate tensile strength, and elongation of the SLM-fabricated AlSiMg1.4−Zr were (343±3) MPa, (485±4) MPa, and (10.2±0.2)%, respectively, demonstrating good strength− plasticity synergy in comparison to the AlSiMg1.4 and other Al−Si-based alloys fabricated by SLM.
{"title":"Strength and plasticity improvement induced by strong grain refinement after Zr alloying in selective laser-melted AlSiMg1.4 alloy","authors":"Yao-xiang GENG , Chun-feng ZAI , Jiang YU , Hao TANG , Hong-wei LÜ , Zhi-jie ZHANG","doi":"10.1016/S1003-6326(24)66572-6","DOIUrl":"10.1016/S1003-6326(24)66572-6","url":null,"abstract":"<div><div>In order to enhance the mechanical properties of the selective laser-melted (SLM) high-Mg content AlSiMg1.4 alloy, the Zr element was introduced. The influence of Zr alloying on the processability, microstructure, and mechanical properties of the alloy was systematically investigated through performing microstructure analysis and tensile testing. It was demonstrated that the SLM-fabricated AlSiMg1.4−Zr alloy exhibited high process stability with a relative density of over 99.5% at various process parameters. Besides, the strong grain refinement induced by the primary Al<sub>3</sub>Zr particle during the melt solidification process simultaneously enhanced both the strength and plasticity of the alloy. The values for the yield strength, ultimate tensile strength, and elongation of the SLM-fabricated AlSiMg1.4−Zr were (343±3) MPa, (485±4) MPa, and (10.2±0.2)%, respectively, demonstrating good strength− plasticity synergy in comparison to the AlSiMg1.4 and other Al−Si-based alloys fabricated by SLM.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 9","pages":"Pages 2733-2742"},"PeriodicalIF":4.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To clarify the precipitation of silica hydrate from the real desilication solutions of aluminosilicate solid wastes by adding seeds and improve integrated waste utilization, the seeded precipitation was studied using synthesized sodium silicate solution containing different inorganic salt impurities. The results show that sodium chloride, sodium sulfate, sodium carbonate, or calcium chloride can change the siloxy group structure. The number of high-polymeric siloxy groups decreases with increasing sodium chloride or sodium sulfate concentration, which is detrimental to seeded precipitation. Calcium chloride favors the polymerization of silicate ions, and even the chain groups precipitate with the precipitation of high-polymeric sheet and cage-like siloxy groups. The introduced sodium cations in sodium carbonate render a more open network structure of high-polymeric siloxy groups, although the carbonate ions favor the polymerization of siloxy groups. No matter how the four impurities affect the siloxy group structure, the precipitates are always amorphous opal-A silica hydrate.
{"title":"Effect of inorganic salt impurities on seeded precipitation of silica hydrate from sodium silicate solution","authors":"Xiao-bin LI, Xiao-bing GAO, Qiu-sheng ZHOU, Yi-lin WANG, Tian-gui QI, Lei-ting SHEN, Gui-hua LIU, Zhi-hong PENG","doi":"10.1016/S1003-6326(24)66592-1","DOIUrl":"10.1016/S1003-6326(24)66592-1","url":null,"abstract":"<div><div>To clarify the precipitation of silica hydrate from the real desilication solutions of aluminosilicate solid wastes by adding seeds and improve integrated waste utilization, the seeded precipitation was studied using synthesized sodium silicate solution containing different inorganic salt impurities. The results show that sodium chloride, sodium sulfate, sodium carbonate, or calcium chloride can change the siloxy group structure. The number of high-polymeric siloxy groups decreases with increasing sodium chloride or sodium sulfate concentration, which is detrimental to seeded precipitation. Calcium chloride favors the polymerization of silicate ions, and even the chain groups precipitate with the precipitation of high-polymeric sheet and cage-like siloxy groups. The introduced sodium cations in sodium carbonate render a more open network structure of high-polymeric siloxy groups, although the carbonate ions favor the polymerization of siloxy groups. No matter how the four impurities affect the siloxy group structure, the precipitates are always amorphous opal-A silica hydrate.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 9","pages":"Pages 3016-3028"},"PeriodicalIF":4.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/S1003-6326(24)66581-7
Lun FU , Bin YANG , Yun-chang GUO , Chao YU , Hong XIAO
TA1 P-Ti/AA6061 composite plate was produced by oxidizing the surface of the titanium plate and adopting a cold roll bonding process. The results revealed that the oxide film (Ti6O) prepared on the surface of TA1 pure titanium was easy to crack during the cold roll bonding, thereby promoting the formation of an effective mechanical interlock at the interface, which can effectively reduce the minimum reduction rate of the composite plates produced by cold rolling of titanium and aluminium plates. Moreover, the composite plate subjected to oxidation treatment exhibited high shear strength, particularly at a 43% reduction rate, achieving a commendable value of 117 MPa. Based on oxidation treatment and different reduction rates, the annealed composite plates at temperatures of 400, 450, and 500 °C displayed favorable resistance to interface delamination, highlighting their remarkable strength−plasticity compatibility as evidenced by a maximum elongation of 31.845%.
{"title":"Bonding enhancement of cold rolling TA1 P-Ti/AA6061 composite plates via surface oxidation treatment","authors":"Lun FU , Bin YANG , Yun-chang GUO , Chao YU , Hong XIAO","doi":"10.1016/S1003-6326(24)66581-7","DOIUrl":"10.1016/S1003-6326(24)66581-7","url":null,"abstract":"<div><div>TA1 P-Ti/AA6061 composite plate was produced by oxidizing the surface of the titanium plate and adopting a cold roll bonding process. The results revealed that the oxide film (Ti<sub>6</sub>O) prepared on the surface of TA1 pure titanium was easy to crack during the cold roll bonding, thereby promoting the formation of an effective mechanical interlock at the interface, which can effectively reduce the minimum reduction rate of the composite plates produced by cold rolling of titanium and aluminium plates. Moreover, the composite plate subjected to oxidation treatment exhibited high shear strength, particularly at a 43% reduction rate, achieving a commendable value of 117 MPa. Based on oxidation treatment and different reduction rates, the annealed composite plates at temperatures of 400, 450, and 500 °C displayed favorable resistance to interface delamination, highlighting their remarkable strength−plasticity compatibility as evidenced by a maximum elongation of 31.845%.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 9","pages":"Pages 2864-2880"},"PeriodicalIF":4.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/S1003-6326(24)66587-8
Liu-bin SONG , Tian-yuan LONG , Min-zhi XIAO , Min LIU , Ting-ting ZHAO , Yin-jie KUANG , Lin JIANG , Zhong-liang XIAO
A composite solid electrolyte comprising a Cu−Al bimetallic metal-organic framework (CAB), lithium salt (LiTFSI) and polyethylene oxide (PEO) was fabricated through molecular grafting to enhance the ionic conductivity of the PEO-based electrolytes. Experimental and molecular dynamics simulation results indicated that the electrolyte with 10 wt.% CAB (PL-CAB-10%) exhibits high ionic conductivity (8.42×10−4 S/cm at 60 °C), high Li+ transference number (0.46), wide electrochemical window (4.91 V), good thermal stability, and outstanding mechanical properties. Furthermore, PL-CAB-10% exhibits excellent cycle stability in both Li−Li symmetric battery and Li/PL-CAB- 10%/LiFePO4 asymmetric battery setups. These enhanced performances are primarily attributable to the introduction of the versatile CAB. The abundant metal sites in CAB can react with TFSI− and PEO through Lewis acid–base interactions, promoting LiTFSI dissociation and improving ionic conductivity. Additionally, regular pores in CAB provide uniformly distributed sites for cation plating during cycling.
{"title":"Improvement of ionic conductivity of solid polymer electrolyte based on Cu−Al bimetallic metal-organic framework fabricated through molecular grafting","authors":"Liu-bin SONG , Tian-yuan LONG , Min-zhi XIAO , Min LIU , Ting-ting ZHAO , Yin-jie KUANG , Lin JIANG , Zhong-liang XIAO","doi":"10.1016/S1003-6326(24)66587-8","DOIUrl":"10.1016/S1003-6326(24)66587-8","url":null,"abstract":"<div><div>A composite solid electrolyte comprising a Cu−Al bimetallic metal-organic framework (CAB), lithium salt (LiTFSI) and polyethylene oxide (PEO) was fabricated through molecular grafting to enhance the ionic conductivity of the PEO-based electrolytes. Experimental and molecular dynamics simulation results indicated that the electrolyte with 10 wt.% CAB (PL-CAB-10%) exhibits high ionic conductivity (8.42×10<sup>−4</sup> S/cm at 60 °C), high Li<sup>+</sup> transference number (0.46), wide electrochemical window (4.91 V), good thermal stability, and outstanding mechanical properties. Furthermore, PL-CAB-10% exhibits excellent cycle stability in both Li−Li symmetric battery and Li/PL-CAB- 10%/LiFePO<sub>4</sub> asymmetric battery setups. These enhanced performances are primarily attributable to the introduction of the versatile CAB. The abundant metal sites in CAB can react with TFSI<sup>−</sup> and PEO through Lewis acid–base interactions, promoting LiTFSI dissociation and improving ionic conductivity. Additionally, regular pores in CAB provide uniformly distributed sites for cation plating during cycling.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 9","pages":"Pages 2943-2958"},"PeriodicalIF":4.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/S1003-6326(24)66590-8
Jia-qiao YUAN , Zhan DING , Yun-xiao BI , Jie LI , Shu-ming WEN , Shao-jun BAI
The lime-depressed pyrite from Cu differential flotation tailings with acid mine drainage (AMD) as a natural activator was recovered. The effect of AMD on lime-depressed pyrite flotation was investigated by a series of laboratory flotation tests and surface analytical techniques. Flotation test results indicated that AMD could effectively activate the pyrite flotation with a sodium butyl xanthate (SBX) collector, and a high-quality sulfur concentrate was obtained. Pulp ion concentration analysis results indicated that AMD facilitated desorption of Ca2+ and adsorption of Cu2+ on the depressed-pyrite surface. Adsorption measurements and contact angle analysis results confirmed that adding AMD improved the adsorption amount of SBX collector on the pyrite surface and increased the contact angle by 31°. Results of Raman spectroscopy and X-ray photoelectron spectroscopy analysis indicated that AMD treatment promoted the formation of hydrophobic species (S0 hydrophobic entity and copper sulfides) and the removal of hydrophilic calcium and iron species on the pyrite surface, which reinforced the adsorption of collector. The findings of the present research provide important theoretical basis and technical support for a cleaner production of copper sulfide ores.
{"title":"Acid mine drainage activation mechanism on lime-depressed pyrite flotation from copper sulfide ore","authors":"Jia-qiao YUAN , Zhan DING , Yun-xiao BI , Jie LI , Shu-ming WEN , Shao-jun BAI","doi":"10.1016/S1003-6326(24)66590-8","DOIUrl":"10.1016/S1003-6326(24)66590-8","url":null,"abstract":"<div><div>The lime-depressed pyrite from Cu differential flotation tailings with acid mine drainage (AMD) as a natural activator was recovered. The effect of AMD on lime-depressed pyrite flotation was investigated by a series of laboratory flotation tests and surface analytical techniques. Flotation test results indicated that AMD could effectively activate the pyrite flotation with a sodium butyl xanthate (SBX) collector, and a high-quality sulfur concentrate was obtained. Pulp ion concentration analysis results indicated that AMD facilitated desorption of Ca<sup>2+</sup> and adsorption of Cu<sup>2+</sup> on the depressed-pyrite surface. Adsorption measurements and contact angle analysis results confirmed that adding AMD improved the adsorption amount of SBX collector on the pyrite surface and increased the contact angle by 31°. Results of Raman spectroscopy and X-ray photoelectron spectroscopy analysis indicated that AMD treatment promoted the formation of hydrophobic species (S<sup>0</sup> hydrophobic entity and copper sulfides) and the removal of hydrophilic calcium and iron species on the pyrite surface, which reinforced the adsorption of collector. The findings of the present research provide important theoretical basis and technical support for a cleaner production of copper sulfide ores.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 9","pages":"Pages 2987-3001"},"PeriodicalIF":4.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/S1003-6326(24)66595-7
Sheng-guo XUE , Jing-pei FENG , Wen-shun KE , Mu LI , Kun-yan QIU , Chu-xuan LI , Chuan WU , Lin GUO
A general prediction model for seven heavy metals was established using the heavy metal contents of 207 soil samples measured by a portable X-ray fluorescence spectrometer (XRF) and six environmental factors as model correction coefficients. The eXtreme Gradient Boosting (XGBoost) model was used to fit the relationship between the content of heavy metals and environment characteristics to evaluate the soil ecological risk of the smelting site. The results demonstrated that the generalized prediction model developed for Pb, Cd, and As was highly accurate with fitted coefficients (R2) values of 0.911, 0.950, and 0.835, respectively. Topsoil presented the highest ecological risk, and there existed high potential ecological risk at some positions with different depths due to high mobility of Cd. Generally, the application of machine learning significantly increased the accuracy of pXRF measurements, and identified key environmental factors. The adapted potential ecological risk assessment emphasized the need to focus on Pb, Cd, and As in future site remediation efforts.
利用便携式 X 射线荧光光谱仪（XRF）测量了 207 个土壤样本的重金属含量，并将六个环境因素作为模型修正系数，建立了七种重金属的一般预测模型。采用极端梯度提升（XGBoost）模型拟合重金属含量与环境特征之间的关系，以评估冶炼场地的土壤生态风险。结果表明，针对铅、镉和砷建立的广义预测模型准确度很高，拟合系数（R2）分别为 0.911、0.950 和 0.835。表层土的生态风险最高，由于镉的高流动性，在一些不同深度的位置存在较高的潜在生态风险。总体而言，机器学习的应用大大提高了 pXRF 测量的准确性，并确定了关键的环境因素。经过调整的潜在生态风险评估强调了在未来的场地修复工作中重点关注铅、镉和砷的必要性。
{"title":"Rapid detection and risk assessment of soil contamination at lead smelting site based on machine learning","authors":"Sheng-guo XUE , Jing-pei FENG , Wen-shun KE , Mu LI , Kun-yan QIU , Chu-xuan LI , Chuan WU , Lin GUO","doi":"10.1016/S1003-6326(24)66595-7","DOIUrl":"10.1016/S1003-6326(24)66595-7","url":null,"abstract":"<div><div>A general prediction model for seven heavy metals was established using the heavy metal contents of 207 soil samples measured by a portable X-ray fluorescence spectrometer (XRF) and six environmental factors as model correction coefficients. The eXtreme Gradient Boosting (XGBoost) model was used to fit the relationship between the content of heavy metals and environment characteristics to evaluate the soil ecological risk of the smelting site. The results demonstrated that the generalized prediction model developed for Pb, Cd, and As was highly accurate with fitted coefficients (<em>R</em><sup>2</sup>) values of 0.911, 0.950, and 0.835, respectively. Topsoil presented the highest ecological risk, and there existed high potential ecological risk at some positions with different depths due to high mobility of Cd. Generally, the application of machine learning significantly increased the accuracy of pXRF measurements, and identified key environmental factors. The adapted potential ecological risk assessment emphasized the need to focus on Pb, Cd, and As in future site remediation efforts.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 9","pages":"Pages 3054-3068"},"PeriodicalIF":4.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/S1003-6326(24)66575-1
You LÜ, Xiang-zhe MENG, Yan-yan LI, Ze-hua DONG, Xin-xin ZHANG
As a promising material in the aircraft industry, 2A97 Al−Cu−Li alloy exhibits high corrosion susceptibility that may limit its application. In the present work, to illustrate the influences of precipitate and grain-stored energy on localized corrosion evolution in 2A97 Al−Cu−Li alloy, cold working and artificial aging were carried out to produce 2A97 Al−Cu−Li alloys under different thermomechanical conditions. Quasi-in-situ analysis, traditional immersion test and electrochemical measurement were then conducted to examine the corrosion behavior of 2A97 alloys. It is revealed that precipitate significantly affects Cu enrichment at corrosion fronts, which determines corrosion susceptibility of alloys, whereas grain-stored energy distribution is closely associated with localized corrosion propagation. It is also indicated that quasi-in-situ analysis exhibits a consistent corrosion evolution with traditional immersion tests, which is regarded as a proper method to explore localized corrosion mechanisms by providing local microstructural information with enhanced time and spatial resolutions.
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