云南某低品位铬铁矿石选矿工艺研究  

Research of Beneficiation Process of a Low-grade Chromite Ore of Yunnan Province

作　　者：王晨亮[1,2,3] 邹坚坚[2,3] 胡真[2,3] 汪泰[2,3] 李汉文[2,3] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]广州有色金属研究院,广东广州510651 [3]稀有金属分离与综合利用国家重点实验室,广东广州510651

出　　处：《金属矿山》2016年第2期72-76,共5页Metal Mine

基　　金：云南省科技创新强省计划项目(编号:2012IB022)

摘　　要：云南某低品位铬铁矿石Cr2O3含量为8.51%。矿石中铬在0.020~0.12 mm粒级的分布率为83.79%、在＋0.12 mm粒级的分布率仅6.55%、在-0.02 mm粒级的分布率仅9.67%。针对铬在较粗和较细粒级含量低的特点,采用振动筛分级—旋流器脱泥工艺预处理,获得了Cr2O3品位为18.52%、回收率为84.61%的沉砂。为给沉砂的合理选矿工艺提供依据,对其进行了单一摇床重选、单一高梯度强磁选、磁重联合工艺流程对比试验。结果表明：采用单一摇床重选工艺可以获得Cr2O3品位为40.56%、回收率为72.71%的铬精矿,采用单一高梯度强磁选工艺获得的铬精矿Cr2O3品位仅38.93%（不能达到40%的要求）、回收率为55.83%,采用磁重联合工艺可以获得Cr2O3品位为45.29%、回收率为73.38%的合格铬精矿。最终确定采用分级—脱泥—高梯度强磁选—摇床重选工艺进行选别,可以实现该铬铁矿资源的有效回收。There is 8.51% Cr203 in a low-grade chromite ore in Yunnan Province. Chromium mainly distributed in 0. 020 -0. 12 mm size fraction, with distribution rate of 83.79% ,while for ＋0. 12 mm is 6. 55%, and 9.67% distributed in - 0. 02 mm. Aiming at chromium distribution rate both in coarse and fine fraction is low, preseparation process using classification-desliming by hydrocyclones was conducted, grit with Cr203 grade of 18. 52% and recovery rate of 84. 61% was obtained. To provide reasonably basis for beneficiation of grit, contrast test was done by single gravity separation, single high gradient high intensity magnetic separation and magnetic-gravity combined separation process. The results show that via single high intensity gravity separation process,chromium concentrate with Cr203 grade of 40. 56% and recovery rate of 72.71% was ob- tained ;via single high gradient high intensity magnetic separation process, chromium concentrate with Cr203 grade of 38.93% （unable to reach standards of 40% ） and recovery rate of 55.83% was obtained; via magnetic-gravity combined separation process, chromium concentrate with Cr203 grade of 45.29% and recovery rate of 73.38% was obtained. Finally, the combined process of classification-des liming-high gradient high intensity magnetic separation-shaking table gravity separation process was conducted, effective recovery of chromium resources was realized.

关 键 词：铬铁矿 分级 脱泥 摇床重选 高梯度强磁选 磁重联合工艺 

分 类 号：TD923.7[矿业工程—选矿] TD924.11