粗TiCl4铜丝塔除钒废水沉淀泥浆综合回收工艺  

Comprehensive recovery of precipitate of wastewater in removing vanadium from raw TiCl4 with copper-wire

作　　者：王学文[1] 张力萍[1] 肖连生[1] 张贵清[1] 袁继维[2] 龚仕成[2] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083 [2]遵义钛业股份有限公司,遵义563004

出　　处：《中国有色金属学报》2008年第E01期422-427,共6页The Chinese Journal of Nonferrous Metals

摘　　要：介绍了一种粗TiCl4铜丝塔除钒废水沉淀泥浆综合回收新工艺。该工艺由沉淀泥浆自氧化、碱洗脱氯、脱氯渣一次酸浸生产硫酸铜、一次酸浸渣苏打焙烧提钒和提钒渣二次酸浸5个主要工序组成。实验结果表明，粗TiCl4铜丝塔除钒废水沉淀泥浆在空气中能自氧化。沉淀泥浆在空气中堆放1个月，接近90％的金属铜变成CuCl2·2H2O，Cu2Cl（OH）3和Cu2（OH）3Cl：这些铜的氯氧化合物在碱性溶液中容易转化成Cu（OH）2；在控制液固比4：1，pH值为11，温度为80℃的条件下搅拌1h，转化率达96％。当酸浸液的pH值为2．0-2．5时，Fe、V、Ti等杂质留在渣中，浸出液蒸发浓缩至密度为1．38g／cm^3，冷却结晶得到的硫酸铜产品符合国标GB437—93的质量要求。酸浸渣按化学计量的2．5倍加苏打后在700℃焙烧3h，焙烧后按液固比3：1加水在70℃搅拌1h浸钒，水浸液按化学计量的3倍加氯化铵沉淀偏钒酸铵，偏钒酸铵在550℃热解2h得到纯度为98．61％的V2O5。提钒渣再经二次酸浸。整个工艺过程铜和钒的总回收率分别达到98．63％和95．65％。A new method was presented to recover copper and vanadium from the precipitate formed in the waste water after vanadium removal from raw TiCl4 with copper-wire. The recovery process consists of five major procedures, namely, the self-oxidization of precipitate, the removal of chlorine with sodium hydroxide solution, the first-stage leaching of copper with suiphuric acid and recovering vanadium by roasting the first leached residue with sodium carbonate, the leaching with water and the leaching copper with sulphuric acid once again, It is found that the precipitate can self-oxidize in air, After stacking for one month in air, about 90% metallic copper contained in the precipitate turns into CuCl2·2H2O, Cu2Cl（OH）3 and Cu2（OH）3Cl. The copper oxychlorides can easily convert to Cu（OH）2, and the conversion rate is over 96% under liquid-to-solid ratio 4：1 and pH 11 at 80 ℃ by stirring for 1 h. When pH value is maintained in the range of 2.0-2.5 during the leaching of sulfuric acid, the impurities of Fe, Ti and V are remained in the leached residue. And then the leaching liquor is concentrated to 1.38 g/cm^3 by evaporation and cooled to obtain the product of CuSO4·5H2O, which is in accordance with the standard of GB437-93, After adding sodium carbonate under the stoichiohaetdc proportion of 2.5 the residue is roasted at 700 ℃ for 3 h. The calcined product is leached with water under liquid-to-solid ratio 3：1 at 70 ℃ by stirring for 1 h. NH4Cl is then added in the leaching liquor containing vanadium according to the stoichiometric proportion of 3 to obtain the precipitate of NH4VO3, When NH4VO3 is thermolysized at 550 ℃ for 2 h, V2O5 with the purity grade of 98.61% is produced. After vanadium removal, the residue is leached once again with sulfuric acid. The total recoveries of copper and vanadium are 98.63% and 95.65%, respectively.

关 键 词：粗TiCl4精制 铜丝 除钒 综合回收 

分 类 号：TQ134.1[化学工程—无机化工] TF841[冶金工程—有色金属冶金]