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火法炼铜吹炼过程产出大量铜渣，经酸浸处理回收铜等有价金属后会产生大量高硅渣。为了实现高硅渣的无害化处置和硅的回收利用，采用热力学软件Factsage 7.3和HSC 6.0对高硅渣碱性焙烧过程主要反应的ΔG-T图、物相平衡分配图及Na_2O-SiO2-FeO体系相图进行计算和绘制。研究结果表明：焙烧温度和ω(Na_2O)/ω(SiO2)的变化会显著影响焙烧转型过程和产物的物相组成。理论上实现SiO2转型的优化条件为：焙烧温度800～900℃、ω(Na_2O)/ω(SiO2)=0.41～0.64。高硅渣中的杂质Al和Fe参与反应过程，且不溶性杂质NaAlSiO4较可溶性杂质Na_2FeO2优先生成。根据热力学分析结果，开展了验证试验，结果表明：在碳酸钠过量系数为SiO2、Al和Fe理论总用量的0.9倍，焙烧温度850℃,焙烧时间2 h的条件下，硅的浸出率达到88.56%。
Abstract：A large amount of copper slag is produced in the pyrometallurgical process of copper smelting, and a substantial quantity of high-silica slag is produced after the recovery of valuable metals such as copper by acid leaching. In order to realize both the harmless disposal of high-silica slag and the recovery utilization of silicon, thermodynamic software Factsage 7.3 and HSC 6.0 were used to calculate and construct ΔG-T diagrams, phase equilibrium distribution diagrams, and phase diagrams of Na_2O-SiO2-FeO system during the main reactions involved in the alkaline roasting process for high-silica slag.The results indicate that variations in roasting temperature and ω(Na_2O)/ω(SiO2) can significantly affect the roasting transformation process and product phase composition.Theoretically, the optimization conditions for SiO2 transformation are determined to be a roasting temperature range of 800—900 ℃ with ω(Na_2O)/ω(SiO2)=0.41—0.64.Furthermore, impurities such as Al and Fe were found to participate in the reaction process within high-silica slag, and insoluble impurity NaAlSiO4 being formed prior to soluble impurity Na_2FeO2.According to the results of thermodynamic analysis, validation tests were carried out.The results show that the leaching rate of silicon reaches 88.56% under the conditions including excess coefficient of sodium carbonate of 0.9 times of the theoretical total amount of SiO2,Al and Fe, roasting temperature of 850 ℃,and roasting time of 2 h.
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基本信息:
DOI：10.3969/j.issn.1007-7545.2024.12.004
中图分类号:TF811
引用信息:
[1]饶剑,李明冬,严康,等.铜冶炼过程酸浸高硅渣碱性焙烧热力学研究[J].有色金属(冶炼部分),2024(12):26-34.DOI:10.3969/j.issn.1007-7545.2024.12.004.
基金信息:
国家重点研发计划项目(2023YFC2907901); 江西省“双千计划”项目(jxsq2019201040); 赣鄱俊才支持计划·青年科技人才托举项目(2024QT06); 江西省自然科学基金资助项目(20224BAB214040,20232BAB204036)
2024-06-03
2024
2024-06-19
2024-06-20
2024
1
2024-12-04
2024-12-04