Invention Grant
- Patent Title: Wet-grinding gypsum with polycarboxylates
- Patent Title (中): 用多羧酸盐湿法研磨石膏
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Application No.: US11985515Application Date: 2007-11-15
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Publication No.: US07861955B2Publication Date: 2011-01-04
- Inventor: Sharon Louise Tracy , David B. McDonald , Qingxia Liu
- Applicant: Sharon Louise Tracy , David B. McDonald , Qingxia Liu
- Applicant Address: US IL Chicago
- Assignee: United States Gypsum Company
- Current Assignee: United States Gypsum Company
- Current Assignee Address: US IL Chicago
- Agency: Greer, Burns & Crain, Ltd.
- Agent David F. Janci, Esq.; Philip T. Petti, Esq.
- Main IPC: B02C19/00
- IPC: B02C19/00
Abstract:
The process of the present invention includes obtaining a feed material having an initial median particle size. A solution of a polycarboxylate dispersant in water is formed, then the feed material is added to the solution to form a slurry. The slurry is wet-ground to reduce the median particle size of the feed material. Optionally, the total amount of polycarboxylate dispersant is divided into a plurality of doses that are added periodically over the total grinding time.
Public/Granted literature
- US20090127360A1 Wet-grinding gypsum with polycarboxylates Public/Granted day:2009-05-21
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