发明名称 |
PROCESS FOR PRODUCING IRON ARSENIDE COMPOUND WITH GOOD CRYSTALLINITY |
摘要 |
<p>A method of producing an iron-arsenic compound by adding an oxidizing agent to an aqueous solution containing arsenic ions and bivalent iron ions and allowing an iron-arsenic compound precipitation reaction to proceed under stirring of the solution, wherein the precipitation reaction is terminated at a solution pH in the range of 0 to 1. When the arsenic concentration of the pre-reaction solution is 25 g/L or greater, the reaction can be terminated at a solution pH in the range of - 0.45 to 1.2. The pH of the pre-reaction solution is preferably greater than 0 and not greater than 2.0. A ferrous sulfate is can be used as the source of the bivalent iron ions. Even when some amount of impurity elements is present in the arsenic-containing solution, the method is nevertheless capable of forming a scorodite compound excellent in crystallinity in the form of a compact compound barely swollen by moisture and the like, i.e., a niron-arsenic compound excellent in filterability.</p> |
申请公布号 |
EP2067748(A1) |
申请公布日期 |
2009.06.10 |
申请号 |
EP20060834067 |
申请日期 |
2006.11.29 |
申请人 |
DOWA METALS & MINING CO., LTD. |
发明人 |
FUJITA, TETSUO;TAGUCHI, RYOICHI |
分类号 |
C01G49/00;C01G28/00;C02F1/58;C22B3/44;C22B7/00;C22B30/04 |
主分类号 |
C01G49/00 |
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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