发明名称 |
High solids processing of kaolinitic clays with post-leaching oxidation |
摘要 |
A process for beneficiating a poor grade crude kaloinitic clay mineral to produce a clay filler for use in papermaking to improve the brightness of the paper product. The crude kaolin clay is blunged with water containing a dispersing agent to form a high solids fluid aqueous clay suspension. This clay suspension is then screened and fractionated to reduce the particle size thereof to 92-95% finer than 2 microns. The fractionated clay suspension is treated with an alkaline leaching solution containing a reducing agent effective in converting ferric ions to ferrous ions and, preferably, a water-soluble anionic phosphate. The leached clay suspension, which has a solids content of at least 55%, is then treated with an oxidizing agent to oxidize unreacted leaching agent and byproducts formed during the leaching process.
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申请公布号 |
US4618374(A) |
申请公布日期 |
1986.10.21 |
申请号 |
US19850717937 |
申请日期 |
1985.03.29 |
申请人 |
GEORGIA KAOLIN COMPANY, INC. |
发明人 |
THOMPSON, III, THOMAS D.;POLESTAK, WALTER J.;BRADSHAW, ROBERT W. |
分类号 |
C09C1/42;D21H17/68;(IPC1-7):C04B14/00;C04B33/00 |
主分类号 |
C09C1/42 |
代理机构 |
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地址 |
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