发明名称 |
Method for stabilizing chromium-contaminated materials |
摘要 |
A method for stabilizing chromium in a chromium-contaminated waste matrix characterized by high concentrations of alkaline material (such as lime) includes the steps of contacting a source of hexavalent chromium with a source of ferrous ions to produce ferric ions; oxidizing iron pyrite to produce ferrous sulfate and sulfuric acid; and contacting the alkaline chromium-contaminated particulate matter with the ferrous sulfate and the sulfuric acid for a time sufficient to convert ferrous sulfate into ferric sulfate and to reduce mobile hexavalent chromium to non-leachable trivalent chromium. The method is integrated in that ferrous sulfate produced by oxidizing iron pyrite serves as a source of ferrous ions in the first contacting step.
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申请公布号 |
US6607474(B2) |
申请公布日期 |
2003.08.19 |
申请号 |
US20010892257 |
申请日期 |
2001.06.27 |
申请人 |
RMT, INC. |
发明人 |
CHOWDHURY AJIT K. |
分类号 |
A62D3/00;A62D3/30;A62D3/36;A62D3/37;A62D3/38;A62D101/24;A62D101/43;B09C1/00;B09C1/08;(IPC1-7):A62D3/00 |
主分类号 |
A62D3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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