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钒渣提钒和铬循环冶金工艺:(Ⅰ)含铬钒酸盐溶液分离回收钒

研究含铬钒酸盐溶液分离回收钒的循环冶金工艺,工艺过程包括溶液中钒的选择性沉淀、沉淀物中钒的浸出及五氧化二钒的制备.在含铬钒酸盐溶液中加入Ca(OH)2进行球磨,不仅可以使其中的钒选择性沉淀析出,而且沉淀物的浸出动力学性能得到显著改善.在含铬钒酸盐溶液中按Ca/V摩尔比1.75:1加入Ca(OH)2,室温球磨60 min,钒的沉淀率达99.59%,而铬的沉淀率只有0.04%.过滤得到的沉钒渣按液固比4:1 mL/g加水,并按NaHCO3/V摩尔比2.74:1加入NaHCO3,室温搅拌60 min,过滤得浸出液,钒的浸出率为99.35%.所得浸出液先通入CO2调pH至8.0,再按NH4HCO3/N...

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Published in:中国有色金属学报(英文版) 2021, Vol.31 (3), p.807-816
Main Authors: 王学文, 杨明鄂, 孟钰麒, 高大雄, 王明玉, 付自碧
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container_issue 3
container_start_page 807
container_title 中国有色金属学报(英文版)
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creator 王学文
杨明鄂
孟钰麒
高大雄
王明玉
付自碧
description 研究含铬钒酸盐溶液分离回收钒的循环冶金工艺,工艺过程包括溶液中钒的选择性沉淀、沉淀物中钒的浸出及五氧化二钒的制备.在含铬钒酸盐溶液中加入Ca(OH)2进行球磨,不仅可以使其中的钒选择性沉淀析出,而且沉淀物的浸出动力学性能得到显著改善.在含铬钒酸盐溶液中按Ca/V摩尔比1.75:1加入Ca(OH)2,室温球磨60 min,钒的沉淀率达99.59%,而铬的沉淀率只有0.04%.过滤得到的沉钒渣按液固比4:1 mL/g加水,并按NaHCO3/V摩尔比2.74:1加入NaHCO3,室温搅拌60 min,过滤得浸出液,钒的浸出率为99.35%.所得浸出液先通入CO2调pH至8.0,再按NH4HCO3/NaVO3摩尔比1:1加入NH4HCO3,室温搅拌8 h结晶析出NH4VO3,过滤后,含氨的结晶液重新用于钒酸钙沉淀的浸出,温室搅拌1 h后钒的浸出率>99%,最后,将所得NH4VO3晶体在560℃煅烧2 h得到纯度为99.6%的V2O5.
doi_str_mv 10.1016/S1003-6326(21)65540-1
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