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• 基金项目：

• 程志久
• 冶金部建筑研究总院环境保护研究所

• 殷广瑾
• 冶金部建筑研究总院环境保护研究所

• 张玉梅
• 冶金部建筑研究总院环境保护研究所

• 摘要：本方法首先利用废液中的游离酸溶解特殊钢加工过程中产生的废渣,然后采用空气氧化法,在pH4-5,70-80℃,晶种存在条件下,通压缩空气进行氧化,分离废液中的铁、铬和镍、钴,并回收镍、钴.国内外资料中尚未见到此方法.

• Abstract：Wet air oxidation process is one for treating spent special steels pickling liquor to recover acid in an indirect way acid and valuable metals. In the process, first step is taken by making use of free acid in spent liquor to dissolve waste slag obtained during special steel processing. Thus, overall acidity of the spent liquor is reduced and recovery of valuable metals are augmented. Then wet air oxidation is conducted by introducing compressed air into the spent liquor in presence of inoculating crystal at pH 3-5 and a temperature of 70-80℃. Iron and chromium in liquor are separated from nickel and cobalt and removed by filtration in the form of solid oxides. The filtrate obtained is of weak acidity containing nickel and cobalt, and further conditioned to pH 8-9 by Na₂CO₃ powder or NaOH solution. Nickel and cobalt, are recovered in the form of their carbonates or hydroxides. The liquid to be discharged is colorless, transparent and of weak basicity.

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