【摘要】 研究了用水合肼回收电沉积铬废液中铬的工艺条件。实验结果表明,在30℃下于25mL含铬废液中加入1.6mLH2SO4和0.8mL水合肼,8min即可使Cr(Ⅵ)还原为Cr(Ⅲ)。然后用浓氨水使Cr(Ⅲ)完全沉淀,再与H2SO4充分反应,得到Cr2(SO4)3,从而实现铬废液中铬的回收。更多还原

【Abstract】 The process conditions of reclaiming chromium from electrodeposition chromium waste liquid using hydrazine hydrate as reducing agent were studied.The experimental result showed that Cr（Ⅵ） was deoxidized to Cr（Ⅲ） at 30 ℃ in 8 min,adding 1.6 mL H₂SO₄ and 0.8 mL hydrazine hydrate to 25 mL chromium-containing waste liquid.Cr（Ⅲ） was deposited using concentrated ammonia water,and then was reacted with H₂SO₄. Cr₂（SO₄）₃ was obtained and thereby chromium in the chromium waste liquid was reclaimed successfully.更多还原