| 发明名称 | Method for removing arsenic as scorodite | ||
| 摘要 | The invention relates to a method for removing arsenic as scorodite from solutions that contain iron and arsenic. In accordance with the method, arsenic is first precipitated as ferric arsenate and subsequently processed hydrothermally into crystalline scorodite. | ||
| 申请公布号 | US8790516(B2) | 申请公布日期 | 2014.07.29 |
| 申请号 | US201013202762 | 申请日期 | 2010.02.19 |
| 申请人 | Outotec Oyj | 发明人 | Ruonala Mikko;Leppinen Jaakko;Miettinen Ville |
| 分类号 | B01D21/00;C02F1/52;B03D3/00;C02F1/72;C01G1/00;C01G49/00;C01G51/00;C01G53/00;C22B1/00;C22B23/00;C22B7/00;C22B30/04;C22B3/44;C02F1/68;C02F1/00;B01D37/00;C01G28/00;C01G29/00;C01G30/00;C02F1/74;C02F101/10;C02F101/20 | 主分类号 | B01D21/00 |
| 代理机构 | Chernoff Vilhauer McClung & Stenzel LLP | 代理人 | Chernoff Vilhauer McClung & Stenzel LLP |
| 主权项 | 1. A method for precipitating iron and arsenic as a poorly soluble compound from acidic aqueous solutions, characterised in that an iron-containing solution and an arsenic-containing solution are oxidised by means of an oxidant so that the iron is oxidised to trivalent and the arsenic to pentavalent and that iron and arsenic are precipitated in a ferric arsenate precipitation stage as ferric arsenate at atmospheric pressure, whereby the iron-arsenic ratio and the pH are adjusted in the ferric arsenate precipitation stage to the region of 1-3.5, and the pH in the region of 1.5-4.5; the ferric arsenate precipitate formed is routed to hydrothermal conversion at a temperature of 150-200° C., at which the ferric arsenate crystallises as poorly soluble scorodite. | ||
| 地址 | Espoo FI | ||