发明名称 |
PROCESS FOR REDUCTIVE BLEACHING OF ALKALINE EARTH METAL CARBONATES |
摘要 |
A process for improving the brightness of an alkaline earth metal carbonate utilizing formamidine sulfinic acid or sodium dithionite as a reductive bleaching agent is disclosed. Where the alkaline earth metal carbonate is calcium carbonate, addition of the reductive bleaching agent to an aqueous slurry of the calcium carbonate takes place prior to, during, or after formation of the carbonate, which is chosen from at least one of a precipitated calcium carbonate and a ground calcium carbonate.
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申请公布号 |
CA2438039(A1) |
申请公布日期 |
2002.08.22 |
申请号 |
CA20022438039 |
申请日期 |
2002.02.13 |
申请人 |
IMERYS MINERALS LIMITED;MORTIMER, MARK DANIEL |
发明人 |
PEREZ, FLORANGEL D.;WINDEBANK, MARK;GOLLEY, CHRISTOPHER R.L.;THRALE, DEBORAH SUSAN;PAYTON, DESMOND CHARLES;MORTIMER, MARK DANIEL |
分类号 |
C01B31/24;C01F5/24;C01F11/18;(IPC1-7):C01F11/18 |
主分类号 |
C01B31/24 |
代理机构 |
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地址 |
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