Method for integrated production of magnesium sulfate, magnesium carbonate and magnesium hydroxide from magnesite
Title:
Method for integrated production of magnesium sulfate, magnesium carbonate and magnesium hydroxide from magnesite
Application Number:
02130915
Application Date:
2002/09/13
Announcement Date:
2003/03/12
Pub. Date:
Publication Number:
1401573
Announcement Number:
1212271
Grant Date:
2005-7-27
Granted Pub. Date:
2005-7-27
ApplicationType:
Invention
State/Country:
11[China|beijing]
IPC:
C01F 5/00, C01F 5/40, C01F 5/24, C01F 5/14, C04B 2/10
Applicant(s):
Tsinghua Univ.
Inventor(s):
Zhu Guocai, Meng Guangzhou, Yuan Shaogang
Key Words:
integrated production, magnesium sulfate, magnesium carbonate, magnesium hydroxide,magnesite
Abstract:
A process for preparing magnesium sulfate, magnesium carbonate and magnesium hydroxide from magnesite includes reaction of light-burned magnesium oxide powder obtained by calcining magnesite, the solution of ammonium sulfate as the by-product obtained by reaction with magnesium carbonate and magnesium hydroxide precipitate and industrial concentrated sulfuric acid, evaporating ammonia gas, dissolving in water, depositing to obtain magnesium hydroxide, controlling acidity and temp. filtering to remove impurities, cooling crystallizing to obtain magnesium sulfate heptahydrate, diluting the mother liquid, preparing alkaline magnetic carbonate by ammonium hydrogen carbonate method, and sulfuric acid absorption to residual ammonia water to obtain ammonium sulfate as by-product. Its advantage is no generation of gas and liquid pollutants.
Claim:
Priority:
PCT:
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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
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