湖南某高钙贫菱锰矿浸出实验研究

摘要

对湖南某高钙贫菱锰矿进行了浸出实验研究,考察了酸矿质量比、温度、时间和矿物粒度对矿石浸出的影响.结果表明,在酸矿比0.68、浸出温度50℃、浸出时间5 h、矿物粒度-150μm时,矿石中锰浸出率达到93％左右;控制浸出液pH值为6.4,通空气氧化除铁2 h,SDD和硫化铵用量分别为矿石中金属锰质量的1.5％和0.5％时,溶液中铁和重金属杂质含量均可降至1 mg/L以下,符合电解锰合格液要求.%A leaching test was conducted with a high-calcium and low-grade rhodochrosite from Hunan province, in which effects of mass ratio of acid to ilmenite, leaching temperature, retention time and mineral grain size on leaching of rhodochrosite were explored. Results showed that a 5 h-leaching process at 50 ℃ with the mass ratio of acid to ilmenite at 0.68 and particle size of -150μm, resulted in the manganese leaching rate around 93％. By controlling the pH value of lixivium at 6. 4, adding SDD and ( NH4 ) 2 S at an amount of 1. 5％ and 0. 5％ of manganese in the ore by mass, respectively , the concentrations of both iron and heavy metal impurities in the solution were decreased to less than 1 mg/L, up to the standard for electrolytic manganese.