半氧化锰矿的浸出过程  

Leaching Process of Semi-oxidized Manganese Ore

作　　者：金生龙[1] 王雨红[1] 粟海锋[1] 程晨[1] 雷作敏 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《过程工程学报》2014年第6期937-942,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51164002);广西自然科学基金资助项目(编号:2013GXNSFAA019290);广西教育厅科学技术研究项目资助(编号:2013ZL007)

摘　　要：对半氧化锰矿的湿法浸出过程影响因素进行了实验研究,探讨了浸出机理.结果表明,锰矿中Mn CO3的浸出速率比Mn O2快,Mn CO3和Mn O2形成消耗H+的竞争关系,Mn CO3比Mn O2易获得H+而易被浸出,而Mn O2分解又有利于包裹于其中的Mn CO3暴露而参与反应;在半氧化锰矿用量10.0 g、蔗糖用量0.6 g、硫酸浓度5 mol/L、反应温度90℃、反应时间60 min的浸出条件下,总Mn浸出率约为90%,其中Mn O2与Mn CO3的浸出率分别稳定在约95%和98%;锰矿中仍有约10%锰未被浸出,是由于存在难溶的硅酸锰及部分锰被包裹于惰性脉石中.经800℃焙烧30 min后浸出,或在浸出过程中加入1.0 g氟化铵,总Mn浸出率分别达98%和96%,表明通过高温焙烧活化或添加氟离子作为助浸剂能消除脉石层的包裹阻碍作用,有利于提高锰浸出率.The leaching process and influential factors of semi-oxidized manganese ore were investigated,and the leaching mechanism was analyzed.The results showed that in the leaching process,the leaching rate of MnCO3 was faster than that of MnO2.There was a competitive consumption relationship of H^＋ between MnCO3 and MnO2,the former could easily get H^＋ in leaching,and the decomposition of MnO2 could be advantageous over MnCO3 which was packed in leaching.The leaching rate of total Mn was about 90% under the conditions of 10.0 g ore,0.6 g sucrose and 5 mol/L sulfuric acid concentration for 60 min at 90 ℃,but the leaching rate of MnO2 and MnCO3 was steady at 95% and 98%,respectively.There was about 10% Mn could not be leached due to the existence of refractory manganese silicate phase and some wrapped Mn in gangue.98% of total Mn leaching rate could be achieved by roasting the ore for 30 min at 800 ℃ before leaching.And 96% could be obtained by adding ammonium fluoride in the leaching process.The leaching rate of ore could be raised by roasting activation or adding fluorine ion to eliminate the package of gangue.

关 键 词：半氧化锰矿 蔗糖 浸出 焙烧 脉石 氟化铵 

分 类 号：TQ137.12[化学工程—无机化工]