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内蒙古某砷精矿为典型的难处理金矿，金以包裹形态赋存于毒砂(FeAsS)、黄铁矿(FeS2)中，砷化物包裹不仅严重降低氰化浸金效率，还会对环境造成影响。研究了采用加压氧化法从该矿中除砷提金，考察了硫酸浓度、氧分压、浸出温度、固液质量体积比、浸出时间对浸出效果的影响，优化了工艺条件，并揭示了关键制约因素。结果表明：加压浸出可有效破坏硫化物与砷化物对金的包裹结构，且全程无As_2O3、SO2等有害气体生成排放，环境友好性显著优于氧化焙烧法；确定最佳工艺条件为硫酸浓度0.4mol/L，氧分压1.5 MPa，浸出温度160℃，固液质量体积比1∶100，浸出时间120 min，在该条件下，砷浸出率达96%，浸出渣中金质量分数为28g/t，相比原矿的4.5g/t有大幅提升；浸出渣中持续存在的砷酸铁(FeAsO4)沉淀是限制砷完全脱除与金品位进一步提升的主要制约因素。该工艺可为同类难处理金矿的清洁高效利用提供技术参考。
Abstract：A gold-bearing arsenic concentrate from Inner Mongolia is a typical refractory gold ore,where gold exists in an encapsulated form within arsenopyrite(FeAsS)and pyrite(FeS2).The encapsulation of arsenides not only severely reduces the efficiency of cyanide leaching of gold extraction but also affects environment.The method of removing arsenic and extracting gold by pressurized oxidation was studied.The influences of sulfuric acid concentration,oxygen partial pressure,reaction temperature,solid mass to liquid volume ratio,and reaction time on the leaching effect were investigated.The process conditions were optimized and the key constraints were revealed.The results show that pressure leaching can effectively destroy the coating structure of gold by sulfides and arsenides,and there is no emission of harmful gases such as As2 O3 and SO2 throughout the process.Its environmental friendliness is significantly better than that of oxidation roasting.The optimal process conditions are determined as follows:sulfuric acid concentration of 0.4 mol/L,oxygen partial pressure of 1.5 MPa,reaction temperature of 160 ℃,solid mass to liquid volume ratio of1∶100,and leaching time of 120 min.Under the conditions,the arsenic leaching rate reaches 96%,and the mass fraction of gold in the leaching residue is 28g/t,which is significant increased compared with 4.5g/t of the raw ore.The persistent presence of ferric arsenate(FeAsO4)precipitate in the leaching residue is the core factor restricting the complete removal of arsenic and the further improvement of gold grade.The research results can provide technical references for the clean and efficient utilization of similar refractory gold mines.
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基本信息:
DOI：10.13355/j.cnki.sfyj.2026.02.013
中图分类号:TF831
引用信息:
[1]袁浩,褚立金,曲维明,等.基于加压浸出技术的内蒙古某砷精矿除砷提金试验研究[J].湿法冶金,2026,45(02):230-236.DOI:10.13355/j.cnki.sfyj.2026.02.013.
基金信息:
省教育厅高校基本科研面上项目（JYTMS20230953）
2025-11-24
2025
2026-03-11
2026
2
2025-12-23
2025-12-23
2025-12-23