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30-05-1962 дата публикации

Method of dehydrating gypsum

Номер: GB0000897925A
Автор: KERR JAMES DONALD, RUEHLE RICHARD RALPH
Принадлежит:

... In the dehydration of gypsum to the hemihydrate in a sealable indirectly heated vessel which is alternately sealed for at least 3 minutes and then vented until the desired dehydration has occured, a minimum positive gauge pressure is maintained in the vessel until the dehydration is completed. The temperature is maintained below 330 DEG F. during the alternate venting and sealing but finally when the dehydrating chamber is sealed the temperature rises to 330 DEG F. whilst the pressure remains below that previously attained. Venting is generally effected at 30 to 40 p.s.i.g. The minimum gauge pressure is generally from 4 to 6 p.s.i.g. and the temperature on venting should not drop below 212 DEG F. The apparatus employed is the same as that disclosed in Specifications 866,126, 897,923 and 897,924. As shown in Figs. 1 and 2, a drum 7 is supported by and rotated with an axial pipe 21 which rests on rollers 5 carried by support 2. Inside the drum the ...

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Номер записи: 1
30-05-1962 дата публикации

Method of dehydrating gypsum

Номер: GB0000897924A
Автор: RUEHLE RICHARD RALPH
Принадлежит:

In the dehydration of gypsum to the hemihydrate in a sealable indirectly heated vessel, the vessel is alternately sealed for at least three minutes and then vented, until the desired dehydration has occurred. Venting is generally effected at 30 to 40 p.s.i.g. and temperatures at about 300 DEG F.; the vessel is preferably resealed before the temperature drops below 212 DEG F. and the product is finally dried by heating to 320 to 340 DEG F. The apparatus employed is the same as that disclosed in Specifications 866,126, 897,923 and 897,925. As shown in Figs. 1 and 2, a drum 7 is supported by and rotated with an axial pipe 21 which rests on rollers 5 carried by support 2. Inside the drum the tube 21 carries a concertinalike arrangement of annular dished members 26 peripherally joined to form a series of chambers communicating with the interior of pipe 21 through perforations 25. A gas burner 22 delivers a blast of hot combustion products into pipe 21 from the left-hand side and these gases ...

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Номер записи: 2