玉米秸秆和稻草-硫酸还原浸出低品位软锰矿

Reductive leaching of manganese from low- grade pyrolusite by corn stlak and rice straw- sulfuric acid

研究了以低品位软锰矿为原料,用玉米秸秆和稻草为混合还原剂,在硫酸介质中还原浸出锰的效果.通过单因素实验确定了玉米秸秆和稻草-硫酸还原浸锰的适宜工艺条件,该适宜工艺条件如下:软锰矿粒径为109μm,玉米秸秆和稻草的质量比为1∶1.5,玉米秸秆和稻草还原剂与软锰矿的质量比为3∶10,硫酸浓度为3.0 mol/L,液固比为10 m L/g,反应温度为90℃,反应时间为80 min.在适宜的浸出工艺条件下,软锰矿中锰的浸出率可达97%以上,锰的浸出效果较好.

The reductive leaching effect of manganese was studied using low- grade pyrolusite as raw material,corn stlak and rice straw as compound reductive agent in sulfuric acid medium. The appropriate technical conditions of reducion leaching of manganese from low- grade pyrolusite with corn stlak and rice straw- sulfuric acid by single- factor test were confirmed. The appropriate technical conditions were as follows：pyrolusite particle size was 109 μm,the mass ratio of corn stlak to rice straw was 1 ∶ 1. 5,the mass ratio of reductive agent of corn stlak and rice straw to pyrolusite was 3∶ 10,sulfuric acid concentration was 3. 0mol / L,the liquid- to- solid ratio was 10 m L / g,reaction temperature was 90 ℃ and reaction time was 80 min. The leaching rate of manganese in pyrolusite reached above 97% under the appropriate leaching conditions,the leaching effect of manganese was better.