发明公开
- 专利标题： The treatment of mineral surfaces
- 专利标题（中）： Behandlung von mineralischenOberflächen。
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申请号： EP91303419.5申请日： 1991-04-17
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公开(公告)号： EP0453260A1公开(公告)日： 1991-10-23
- 发明人: Edwards, Roderick Ivan , Coates, Anthony Charles
- 申请人： MINEMET (Proprietary) Limited
- 申请人地址： 3RD Floor, 34 Essex Terrace Westville 3630 P O Box 512 WESTVILLE 3630 ZA
- 专利权人： MINEMET (Proprietary) Limited
- 当前专利权人： MINEMET (Proprietary) Limited
- 当前专利权人地址： 3RD Floor, 34 Essex Terrace Westville 3630 P O Box 512 WESTVILLE 3630 ZA
- 代理机构： Pidgeon, Robert John
- 优先权： ZA90897871 19900418; ZA901463 19900418
- 主分类号： C04B33/04
- IPC分类号： C04B33/04 ; C09C3/06 ; C09C1/40 ; C09C1/42 ; C09C1/02 ; C01B33/22 ; C01B33/26
摘要：
A treatment method for chemically removing discolouring transition metal oxide contaminants from the surfaces of mineral particles to improve their brightness is provided. The method involves the contacting of the mineral particles with a solution of sulphur dioxide in water whilst simultaneously activating the sulphur dioxide to a reducing sulphur containing species to reduce transition metals and render them soluble. Dissolution of the reduced transition metals is effected by utilising excess sulphur dioxide or by employing a mineral acid such as sulphuric acid in solution.
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