发明公开
- 专利标题: METHOD OF PURIFYING GYPSUM
- 专利标题(中): 清理方法膏药
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申请号: EP09730312.7申请日: 2009-04-08
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公开(公告)号: EP2279151A1公开(公告)日: 2011-02-02
- 发明人: HEISKA, Perttu
- 申请人: Kemira OYJ
- 申请人地址: Porkkalankatu 3 00180 Helsinki FI
- 专利权人: Kemira OYJ
- 当前专利权人: Kemira OYJ
- 当前专利权人地址: Porkkalankatu 3 00180 Helsinki FI
- 代理机构: Sahlin, Jonna Elisabeth
- 优先权: FI20085296 20080409
- 国际公布: WO2009125064 20091015
- 主分类号: C01F11/46
- IPC分类号: C01F11/46 ; B03C1/00
摘要:
A method of purifying flue gas desulfurization (FGD) gypsum. The method includes the steps of a) providing an aqueous slurry containing said FGD gypsum, b) passing the aqueous slurry to a magnetic separator, and c) contacting the FGD gypsum to be purified with a solution containing an acid and having pH below 5 in an acid washing step. Also, a purified FGD gypsum obtained by the inventive method and the use thereof as coating or filler pigment for paper or board.
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