发明授权
- 专利标题： Process for manufacturing ultra low consistency alpha- and beta- blend stucco
- 专利标题（中）： 制造超低浓度α-和β-混合灰泥的方法
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申请号： US11533604申请日： 2006-09-20
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公开(公告)号： US07588634B2公开(公告)日： 2009-09-15
- 发明人: Michael R. Lynn , W. David Song , Qingxia Liu , Qiang Yu , Michael L. Cloud
- 申请人： Michael R. Lynn , W. David Song , Qingxia Liu , Qiang Yu , Michael L. Cloud
- 申请人地址： US IL Chicago
- 专利权人： United States Gypsum Company
- 当前专利权人： United States Gypsum Company
- 当前专利权人地址： US IL Chicago
- 代理机构： Novak Druce + Quigg LLP
- 主分类号： C04B11/00
- IPC分类号： C04B11/00
摘要：
A process is disclosed for making a blend of alpha- and beta-stucco including a slurry calcination step to produce alpha calcium sulfate hemihydrate followed by a fluidized bed calcination step to produce beta calcium sulfate hemihydrate. The process starts with 50-75% gypsum-containing solids slurry, and then steam calcines the slurry in a first reactor to form partially calcined gypsum slurry which contains calcium sulfate dihydrate and alpha calcium sulfate hemihydrate. The partially calcined slurry is then dewatered. Then the filter cake is fed into a kettle to complete the calcination process by converting the calcium sulfate dihydrate of the filter cake material into beta calcium sulfate hemihydrate.