石煤复合添加剂焙烧提钒试验研究  

Extracting Vanadium from Stone Coal with Composite Additive

作　　者：赵强[1] 宁顺明[1] 佘宗华[1] 黄臻高[1] 

机构地区：[1]长沙矿冶研究院有限责任公司,湖南长沙410012

出　　处：《稀有金属》2013年第6期961-967,共7页Chinese Journal of Rare Metals

基　　金：国家科技部科技支撑计划基金(2012BAB07B04)资助

摘　　要：针对某石煤钒矿的矿石性质及岩相分析结果,创造性地采用复合添加剂焙烧-稀酸浸出工艺进行提钒试验研究,一定程度上克服钠化焙烧环境污染严重、单一钙化焙烧浸出率低及无盐焙烧无法有效破坏钒云母结构的缺陷,对复合添加剂焙烧-浸出工艺参数进行了优化,考察了焙烧温度、焙烧时间、添加剂种类及用量、浸出酸用量、浸出时间及液固比对钒浸出率的影响。结果表明,矿石中有用矿物为含钒云母、铁铝石等,钒主要为V3+和V4+,而V5+极少,属难处理矿石。对原矿品位为0.81%的混合矿样,在焙烧温度930℃、添加6%石灰石+4%白云石的条件下焙烧12 h,该焙烧料在浸出酸用量8%、浸出时间2.0 h、液固比2∶1的条件下,可获得钒浸出率为76.51%的浸出液。因此,采用复合添加剂焙烧可以有效地从石煤中提取钒,经济及环保效益显著。According to the characteristic and petrographic analysis results of a stone coal, the composite additive roasting-dilute acid leaching technology was used to extract vanadium, so as to overcome the defects of heavy environmental pollution of sodium salt roast- ing, low leaching efficiency of single calcification roasting and useless of no-salt roasting to break the vanadium mica structure. Mean- while, the technological parameter was optimized, the effect of roasting temperature, roasting time, usage and kinds of additive, usage of acid, liquid-solid ratio and leaching time on vanadium leaching efficiency were investigated. The results showed that valuable miner- al in the ore were roscoelite, etc. Most of vanadium was in the state of V3 ＋ , V4 ~ , and very few V5 ＋ , the ore was refractory. As to the grade of mixed stone coal raw ore of 0.81%, under the roasting temperature of 930, limestone of 6% and dolomite of 4%, roasting time of 12 h, acid of 8% , liquid-solid ratio of 2： 1, leaching time of 2 h, the vanadium leaching efficiency was up to 76.51%. In summary, the vanadium could be availably extracted from stone coal by composite additive roasting technique, its economic and envi- ronmental benefits were notable.

关 键 词：石煤钒矿 复合添加剂焙烧 浸出 

分 类 号：TF111[冶金工程—冶金物理化学]