新型硫化物助剂强化浸出酸浸渣中铁的研究

Study on Intensified Leaching of Ferric Iron from Acid-leach Residues Using Sulfide as a Novel Leaching Agent

采用硫化物作助剂强化溶浸酸浸渣中的氧化铁。分别进行了助浸剂用量、硫酸用量、时间、温度、液固比等条件试验,考察其对酸溶效果的影响,结果表明:当助剂与渣质量比为0.69∶1,硫酸过剩系数为1.4,起始液固比为2∶1,搅拌速度为1 300 r/min时,在95℃下反应2 h,铁的浸取率可以达到89.2%,助剂中锌的浸出率为90.2%,尾渣易于进一步提金。与现行技术条件相比,硫酸用量大大减少,工艺简单,能耗低。

Taking sulfide as a leaching agent, tests were conducted on the intensified-leaching of iron oxide from acidleach residue. Influence of different factors, such as consumption of leaching agent, dosage of sulfuric acid, leaching time and temperature, as well as liquid-solid ratio, on the leaching effect was investigated. Results show that iron leaching rate reaches 89.2% and the leach rate of zinc from leaching agent is 90.2% under the following conditions of obtained can also be used for further gold-extraction. This process is simple with low energy consumption compared with the existing technology, and sulfuric acid consumption is greatly reduced.