发明名称 |
PROCESS FOR PRODUCING GYPSUM |
摘要 |
The invention relates to a process for the preparation of a gypsum product wherein calcium sulphate hemihydrate and/or calcium sulphate anhydrite and water are contacted so that the calcium sulphate hemihydrate and/or calcium sulphate anhydrite and the water react with each other and form a gypsum product. The reaction mixture has a dry matter content of 34-84% by weight in order to obtain a gypsum product which consists of crystals that are small, flat and of as equal size as possible. The invention also relates to a product prepared by this process. A gypsum product is formed which consists of essentially intact crystals having a size of between 0.1 and below 2.0 mum. The products are applicable e.g. as fillers or coating pigments in e.g. paper industry.
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申请公布号 |
US2010034727(A1) |
申请公布日期 |
2010.02.11 |
申请号 |
US20080525149 |
申请日期 |
2008.02.01 |
申请人 |
TURKKI TARJA;HEISKA PERTTU;HAGELBERG PASI;LAAKSO VEIKKO |
发明人 |
TURKKI TARJA;HEISKA PERTTU;HAGELBERG PASI;LAAKSO VEIKKO |
分类号 |
C01F11/46 |
主分类号 |
C01F11/46 |
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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