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以甲醛和铁粉为还原剂在硫酸溶液中协同还原氧化锰矿,考察了还原剂用量、硫酸体积分数、浸出时间、浸出温度、液固比和搅拌速率对锰浸出率、浸出液中铁和甲酸的质量浓度的影响,并用响应面法设计优化试验。结果表明,在硫酸的体积分数为15%、甲醛用量为理论量的90%、甲醛和铁的摩尔比为2、二者浸出时间之比为2、总浸出时间2.93h、浸出温度85℃、液固比6、转速150r/min的条件下,锰浸出率达98.04%,浸出液中铁和甲酸的质量浓度分别为13.96mg/mL、1.40mg/mL。
Using formaldehyde and iron powder as reductant to synergistically reduce manganese oxide ore in sulfuric acid solution, the effect of reducing agent dosage, sulfuric acid volume fraction, leaching time, leaching temperature, liquid-solid ratio and stirring rate on manganese leaching rate, iron and formic acid Concentration effect, and response surface methodology design optimization test. The results showed that when the volume fraction of sulfuric acid was 15%, the amount of formaldehyde was 90% of the theoretical amount, the molar ratio of formaldehyde to iron was 2, the ratio of the two leaching time was 2, the total leaching time was 2.93h, the leaching temperature was 85 ℃, Liquid to solid ratio of 6, speed of 150r / min under the conditions of manganese leaching rate of 98.04%, the leachate iron and formic acid concentration of 13.96mg / mL, 1.40mg / mL.