富硅软锰矿强磁选-碱浸脱硅工艺  

High-intensity magnetic separation-alkaline leaching process to desiliconize from silicon-rich pyrolusite

作　　者：冯雅丽[1] 李斌[1] 李浩然[2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]中国科学院过程工程研究所生化工程国家重点实验室,北京100190

出　　处：《中南大学学报（自然科学版）》2015年第4期1175-1181,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(21176026;21176242);中国大洋矿产资源研究开发计划项目(DY125-15-T-08);国家高技术研究发展计划(863计划)项目(2012AA062401)~~

摘　　要：对硅锰质量比为3.5:1的富硅软锰矿采用强磁选-碱浸工艺脱硅,通过单因素和正交试验研究强磁选试验中磨矿细度和磁场强度,碱浸试验中反应温度、反应时间、NaOH浓度和液固比对硅脱除率的影响,利用"减缩核模型"研究碱浸过程中反应温度对硅脱除率影响的动力学,并得到相应的动力学方程。研究结果表明:在矿石入选粒度为小于74μm占75%、磁场强度为1273.2kA/m、碱浸反应温度为120℃、反应时间为5.5h、NaOH浓度为16mol/L、液固比(mL/g)为5:1的条件下,得到碱浸渣中硅锰质量比为0.3:1,硅脱除率为81%。碱浸过程受化学反应控制,表观反应活化能为67.77kJ/mol。By means of high-intensity magnetic separation-alkaline leaching to desiliconize from silicon-rich pyrolusite of silicon-manganese mass ratio of 3.5：1, using single factor and orthogonal experiments to study the grinding fineness and magnetic field strength in magnetic separation test, the effect of temperature and time of reaction, concentration of NaOH and the ratio of liquid-solid to the removal rate of silicon in alkaline leaching test, using the ＂Reduction of nuclear model＂ to study the dynamics of effect of reaction temperature to the removal rate of silicon in alkali leaching process,and get the corresponding dynamic equation. The results show that under the conditions of the selected ore particle size of75% less than 74 μm, the magnetic field intensity of 1 273.2 k A/m, the alkaline leaching reaction temperature of 120 ℃,reaction time of 5.5 h, concentration of NaOH of 16 mol/L and the ratio of liquid-solid（m L/g） of 5：1, the alkali leaching residue is obtained with the silicon-manganese mass ratio of 0.3：1 and removal rate of silicon of 81%. The alkali leaching process is controlled by chemical reaction and the apparent activation energy is 67.77 k J/mol.

关 键 词：富硅软锰矿 磁选 碱浸 脱硅 

分 类 号：TF792[冶金工程—钢铁冶金]