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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 ore properties and lithofacies analysis results of a stone coal vanadium ore, the vanadium extraction experiment was creatively carried out by roasting and dilute acid leaching process of composite additive. To a certain extent, the pollution of sodium roasting environment was overcame, the leaching rate of single calcination roasting was low and The roasting-leaching process parameters of composite additive were optimized without salt roasting, which could not effectively destroy the structure of vanadium mica. The effects of roasting temperature, roasting time, kinds and amounts of additives, amount of leaching acid, leaching time and liquid to solid ratio on vanadium leaching Rate of impact. The results show that the useful minerals in the ore are vanadium-bearing mica, ferroalum, etc. The main vanadium is V3 + and V4 +, while V5 + is rare, which is a refractory ore. The roasted material samples with 0.81% ore grade were calcined at 930 ℃ for 6 h with addition of 6% limestone and 4% dolomite. The roasted material had a leaching acid content of 8% and a leaching time of 2.0 h. Than 2: 1, the leaching solution with the vanadium leaching rate of 76.51% can be obtained. Therefore, the use of composite additives roasting can effectively extract vanadium from stone coal, economic and environmental benefits significantly.