化工学报Issue(3)：948-953,6.DOI:10.3969/j.issn.0438-1157.2014.03.026
煅烧-碱浸法从钒铬还原渣中分离回收钒铬
Separation and recovery of chromium and vanadium from reduced vanadium-chromium precipitate by calcinations-alkaline leaching
摘要
Abstract
Separation and recovery of chromium and vanadium from reduced vanadium-chromium precipitate were implemented by calcination followed by alkaline leaching. The reaction process during calcination and the factors, such as temperature, time and alkaline medium, affecting leaching vanadium were investigated. Cr(Ⅲ) and V(Ⅳ) could form CrVO4, and then CrVO4 was decomposed into Cr2O3 and V2O5 during calcinations. The appropriate conditions for calcination were temperature of 950℃and time of 1.0-3.0 h. Under the same molarity conditions, NaOH was better than Na2CO3 for leaching V2O5. Increasing NaOH concentration and time was favorable for leaching of V2O5 while temperature had little effect on leaching of V2O5. When reduced vanadium-chromium precipitate was calcined for 1.5 h at 850℃and was treated for 1.5 h using 3 mol·L-1 NaOH, the content of Cr2O3 in the residue was more than 96%, and leaching rates of vanadium and chromium were 87.3%and less than 1%, respectively. Additionally, 97%of vanadium in the filtrate could be precipitated by acidic ammonium salt.关键词
钒铬还原渣/煅烧/浸取/回收Key words
reduced vanadium-chromium precipitate/calcination/leaching/recovery分类
矿业与冶金引用本文复制引用
杨合,毛林强,薛向欣..煅烧-碱浸法从钒铬还原渣中分离回收钒铬[J].化工学报,2014,(3):948-953,6.基金项目
国家自然科学基金项目(51090384)；国家高技术研究发展计划项目(2012AA062304)。@@@@supported by the National Natural Science Foundation of China (51090384) and the High Technology Research and Development Program of China (2012AA062304) （51090384）
