刚果(金)复杂铜钴合金两段浸出工艺研究

采用一段直接酸浸出-二段氧化酸浸工艺从复杂铜钴合金中浸出钴、铜、铁,考察了浸出工艺条件对铜、钴、铁浸出率的影响。结果表明,一段最佳浸出工艺条件为:液固比10∶1,温度85 ℃,硫酸初始浓度1.8 mol/L,搅拌转速 300 r/min,浸出时间2 h;二段最佳浸出工艺条件为:液固比10∶1,温度90 ℃,硫酸初始浓度4.0 mol/L,搅拌转速350 r/min,氯酸钠用量20%,浸出时间6 h。在此条件下,钴、铜、铁的总浸出率达96.99%、99.56%和98.16%。

Two-stage Leaching Process for Complex Copper-cobalt Alloy from Congo (Kinshasa)

A novel two-stage leaching process consisting of first-stage direct acid leaching and the second-stage oxidative acid leaching was adopted to extract Co, Cu and Fe from the complex Cu-Co alloy, and influences of leaching conditions on their leaching rates were investigated. Results showed that under the following optimum conditions including:  the first-stage leaching at 85 ℃ for 2 h with an initial concentration of sulfuric acid at 1.8 mol/L, liquid-to-solid ratio at 10∶1, an agitation speed at 300 r/min;  the second-stage  leaching at 90 ℃ for 6 h with an initial concentration of sulfuric acid at 4.0 mol/L, an agitation speed at 350 r/min, dosage of sodium chlorate at 20% of mass of the residue from the first stage of leaching, the total leaching rates of Co, Cu and Fe reached 96.99%, 99.56% and 98.16%, respectively.