黑色页岩型黏土钒矿的硫酸直接湿法浸出试验研究  

Experimental Study on Direct Leaching of Black Shale- hosted Vanadium-bearing Clay Mineral Concentrates by H_2SO_4

作　　者：冀成庆[1] 沈明伟[1] 朱昌洛[1] 惠博[1] 杨常艳[1] 蔡旺[1] 

机构地区：[1]中国地质科学院矿产综合利用研究所国土资源部钒钛磁铁矿综合利用重点实验室,四川成都610041

出　　处：《钢铁钒钛》2014年第1期11-15,共5页Iron Steel Vanadium Titanium

基　　金：地质大调查项目(1212011120316)

摘　　要：黏土钒矿是典型的难处理钒矿资源之一。以选矿富集的黑色页岩型黏土钒精矿为研究对象，研究硫酸配加助浸剂、氧化剂直接浸出黏土钒矿的工艺，并对酸浸影响因素条件进行优化。研究表明：高浓度硫一氟酸性溶液体系可以很好地破坏云母、黏土矿物、褐铁矿的结构，直接浸钒可行。在黏土钒矿粒度-74μm比例≥85％，浸出温度80～90℃、硫酸（含量98％）加入量54％、搅拌速度400r／min，液固比L／S=2．5～4．0：I，氧化剂NaCl03用量1．25％，助浸剂CaF：用量12％、酸浸时间11h的浸出优化条件下，V2O5的浸出率可达到90％以上，优于传统焙烧法。采用扩散渗析器回收硫酸和氟离子效果良好。Vanadium-bearing clay mineral is one of typical vanadium resources which are difficult to utilize. The feasibility of direct leaching of black shale-hosted vanadium-bearing clay mineral concentrates by H2SO4-CaF2-NaClO3 system was studied. Furthermore, the influencing factors of leaching were investigated. The results show that H-SO4-F acid solution system with high concentration can effectively destroy the mineral structures of mica, clay minerals and limonite. Vanadium leaching rate reaches 90.0% or above with 85 % of concentrates＇ sizes smaller than - 74 p.m, reaction temperature at 80℃, liquid to solid ratio （ volume/mass, mL/g） of 2.5 to 4.0：1 ,H2SO4 （98%） addition amount higher than 54%, stirring speed of 400 r/min, NaClO3 addition amount of 1.25%, CaF2 addition amount of 12% ,and leac- hing time of 11 h. under the conditions, vanadium leaching rate is higher than that of the traditional roasting method, sulfuric acid and fluoride ions can be effectively recovered by diffusion dialyzer.

关 键 词：黑色页岩型黏土钒矿 酸法 直接浸出 

分 类 号：TF803.2[冶金工程—有色金属冶金] TF841.3