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在硫酸介质中以甲醛-硫酸亚铁为还原剂协同还原软锰矿,考察了甲醛-硫酸亚铁摩尔比、温度、反应时间、转速、硫酸浓度等因素对锰、铝的浸出率及溶液中铁和有机残留甲酸的影响.采用单因素实验获得较佳的还原工艺条件,采用HPLC测定溶液中的甲酸.结果表明,在固定转速为200 r/min、液固比为8 ml/g时,最佳反应条件为:甲醛-硫酸亚铁摩尔比1∶3(甲醛1.5 mol)、浸出时间3 h、硫酸浓度3 mol/L、温度90℃.在该条件下重复实验,锰的平均浸出率为93.51%,铝的平均浸出率为33.08%,铁的浓度为23.07 mol/L,甲酸浓度为0.001 g/L.
In sulfuric acid medium with formaldehyde - ferrous sulfate as reducing agent synergistic reduction of pyrolusite, investigated the formaldehyde - ferrous sulfate molar ratio, temperature, reaction time, speed, concentration of sulfuric acid and other factors on the manganese and aluminum leaching rate and the solution of iron and Organic residual formic acid.The optimum conditions for the reduction were obtained by single factor experiments and the formic acid in the solution was determined by HPLC.The results showed that when the rotational speed was 200 r / min and the liquid / solid ratio was 8 ml / g, The reaction conditions were as follows: the molar ratio of formaldehyde to ferrous sulfate was 1: 3 (formaldehyde 1.5 mol), leaching time 3 h, sulfuric acid concentration 3 mol / L and temperature 90 ℃ .At the same time, the average manganese leaching rate was 93.51 %, The average leaching rate of aluminum is 33.08%, the concentration of iron is 23.07 mol / L and the concentration of formic acid is 0.001 g / L.