As和MgO的加入对铜冶炼渣中砷玻璃化的影响  

Effect of As and MgO addition on arsenic vitrification in copper smelting slag

作　　者：金哲男[1,2] 王保仁 杨洪英 赵前飞[1,2] 符岩 Zhe-nan JIN;Bao-ren WANG;Hong-ying YANG;Qian-fei ZHAO;Yan FU(Key Laboratory for Ecological Metallurgy of Multi-metallic Mineral of Education Ministry,Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学多金属矿生态冶金教育部重点实验室,沈阳110819 [2]东北大学冶金学院,沈阳110819

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第6期2020-2033,共14页中国有色金属学报（英文版）

基　　金：supported by the National Key R&D Program of China (No.2018YFC1902004).

摘　　要：研究FeO−SiO_(2)−Fe_(2)O_(3)−B_(2)O_(3)−CaO−Al_(2)O_(3)−(MgO)体系铜冶炼渣中砷(As)的玻璃化。通过XRD、SEM、FTIR和XPS分析手段系统地研究As玻璃化机制。结果表明,As与铁硅酸盐炉渣表现出良好的相容性。FTIR和XPS分析结果表明,As可以部分替代硅形成Si—O—As结构,从而提高熔体的聚合度。[BO_(3)]^(3−)结构单元随着As含量的增加而趋于减少,而加入MgO后则观察到相反的行为。此外,MgO增加了熔体的非桥氧数量(NBO)。TCLP、SPLP和pH依赖性测试结果表明,As的浸出毒性随着As含量的增加而增加,但随着MgO的加入而降低。DSC分析结果表明,As和MgO的加入均可以改善含As玻璃的热稳定性。The arsenic(As)vitrification in copper smelting slag derived from the FeO−SiO_(2)−Fe_(2)O_(3)−B_(2)O_(3)−CaO−Al_(2)O_(3)−(MgO)system was studied.The vitrification mechanism of As was systematically investigated by XRD,SEM,FTIR and XPS analysis.It is determined that As exhibits favorable compatibility with the iron-silicate slag.FTIR and XPS analysis indicates that As can partially substitute for silicon to form the Si—O—As structure,thereby enhancing the degree of polymerization of the melt.The[BO_(3)]^(3−)unit tends to decrease with the increase of the As content,while the opposite behavior is observed with the addition of MgO.Additionally,MgO increases the non-bridging oxygen(NBO)number of the melt.TCLP,SPLP and pH dependence tests show that the leaching toxicity of As increases with the increase of the As content but decreases with the addition of MgO.DSC analysis demonstrates that the incorporation of both As and MgO can improve the thermal stability of the As-containing glass.

关 键 词：玻璃化 砷 氧化镁 铜冶炼渣 炉渣结构 

分 类 号：TF811[冶金工程—有色金属冶金]