Process for manufacturing ultra low consistency +-- and ²- blend stucco
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.
申请公布号
ZA200902621(B)
申请公布日期
2010.03.31
申请号
ZA20090002621
申请日期
2009.04.16
申请人
UNITED STATES GYPSUM COMPANY
发明人
LYNN, MICHAEL R.;SONG, WEIXIN DAVID;LIU, QINGXIA;YU, QIANG;CLOUD, MICHAEL LEE