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    • 8. 发明授权
    • Method for treating chelant solutions to remove metals in solution
    • 处理溶液中螯合剂溶液去除金属的方法
    • US5160631A
    • 1992-11-03
    • US740544
    • 1991-08-05
    • Jack G. FrostKenneth J. Snyder
    • Jack G. FrostKenneth J. Snyder
    • C02F1/02C02F1/52C02F9/00
    • C02F9/00C02F1/025C02F1/5236C02F2101/20Y10S210/912Y10S210/913
    • A process for removing at least a portion of any iron, copper, nickel and chromium ions that are chelated by a alkylenepolyamine polyacetic acid or salt in an aqueous liquid waste. The process comprises the steps of (a) adjusting the pH of the liquid to above about 10; (b) adding sufficient sodium sulfide to react with at least a portion of the copper ions; (c) separating precipitated iron and copper compounds; (d) adding nitric acid to adjust the pH to the range of about 6 to 8; (e) adding sufficient sodium nitrite to the liquid to react with at least a portion of the nickel and chromium present; (f) heating the liquid to above about 575.degree. F. for at least about 15 minutes to facilitate precipitation of nickel and chromium; and (g) separating precipitated solids to leave a non-hazardous filtrate.
    • 一种除去在含水废液中被亚烷基多胺多乙酸或盐螯合的任何铁,铜,镍和铬离子的至少一部分的方法。 该方法包括以下步骤:(a)将液体的pH调节至大约10; (b)加入足够的硫化钠以与至少一部分铜离子反应; (c)分离沉淀的铁和铜化合物; (d)加入硝酸以将pH调节至约6至8的范围; (e)向液体中加入足够的亚硝酸钠以与存在的镍和铬的至少一部分反应; (f)将液体加热至约575°F至少约15分钟以促进镍和铬的沉淀; 和(g)分离沉淀的固体以留下非危险的滤液。