(1. 福州大學(xué) 紫金礦業(yè)學(xué)院，福州 350108；
2. 低品位難處理黃金資源綜合利用國家重點實驗室，廈門 361101；
3. 廈門紫金礦冶技術(shù)有限公司，廈門 361101)
摘 要: 為了考查黃鐵礦對硫砷銅礦浸出的影響，在添加黃鐵礦、常壓化學(xué)浸出條件下研究硫砷銅礦的浸出動力學(xué)和電化學(xué)。采用自制浸出裝置在H2SO4 - Fe2(SO4)3 體系中開展混合礦物化學(xué)浸出實驗。結(jié)果表明：添加黃鐵礦后硫砷銅礦的表觀活化能降低至48.15 kJ/mol；隨著黃鐵礦加入比例的升高，硫砷銅礦的浸出率逐漸提高，當硫砷銅礦與黃鐵礦質(zhì)量比為1:6時，12天硫砷銅礦的浸出率可達23.6%。通過XPS分析了混合礦物表面化學(xué)浸出前后硫和砷形態(tài)的變化，加入黃鐵礦后促進砷轉(zhuǎn)化為五價砷，降低毒性。電化學(xué)工作站測定硫砷銅礦的靜止電位為0.48 V，無菌條件下的電化學(xué)行為解釋了黃鐵礦和硫砷銅礦混合化學(xué)浸出時形成原電池，促進了硫砷銅礦的溶解。
關(guān)鍵字: 硫砷銅礦；黃鐵礦；化學(xué)浸出；靜電位；原電池效應(yīng)
（1. College of Zijin Mining, Fuzhou University, Fuzhou 350108, China;
2. State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Zijin Mining Group Co., Ltd., Xiamen 361101, China;
3. Xiamen Zijin Mining & Metallurgy Technology Co., Ltd., Xiamen 361101, China）
Abstract:In order to investigate the effect of pyrite on enargite leaching, the leaching kinetic and electrochemistry of enargite and pyrite mixture by chemical leaching under the condition of atmospheric pressure were studied. Leaching experiments of enargite and pyrite mixture in H2SO4-Fe2(SO4)3 system were investigated by leaching experimental device. The results show that the activation energy of enargite is decreased to 48.15 kJ/mol, while enargite leaching is increased by the addition of pyrite. Enargite leaching is increased dramatically up to 25% after 12 days with the proportion of enargite to pyrite equaled to 1:6. The morphological changes of sulfur and arsenic of mixture before and after leaching were demonstrated by XPS. Arsenic is promoted to transfer to pentavalent arsenic, which means less toxic. The rest potential of enargite is detected to 0.48 V by the electrochemical workstation. Electrochemical behavior explains the galvanic effect of chemical leaching of enargite and pyrite mixture, which promotes the dissolution of enargite.
Key words: enargite; galvanic effect; pyrite; rest potential; chemical leaching
