Claims
- 1. A process for converting magnesium sulfate into magnesium oxide which comprises calcining the magnesium sulfate in the presence of lignite coke or soot as a reducing agent at a temperature of from 750.degree. C. to 850.degree. C.
- 2. The process according to claim 1, wherein the magensium sulfate is a mixture with magnesium sulfite.
- 3. The process according to claim 2, wherein the lignite coke or soot is added to a slurry of a mixture of magnesium sulfate and magnesium sulfite resulting from the desulfurization of flue gas.
- 4. The process according to claim 1, wherein the magnesium sulfate is calcined from about 10 to about 60 minutes.
- 5. The process according to claim 1, wherein the particle size of said lignite coke is less than 1000.mu..
- 6. The process according to claim 1, wherein the particle size of said soot is less than about 100.mu..
- 7. The process according to claim 1, wherein the amount of said lignite coke or soot is from about 5 to about 50 parts per weight per 100 parts by weight of the magnesium sulfate.
- 8. The process according to claim 1, wherein the amount of lignite coke or soot is from about 1 to about 5 parts by weight per 100 parts by weight of magnesium sulfate.
- 9. The process according to claim 1, wherein the magnesium sulfate is calcined in an inert atmosphere.
Parent Case Info
This is a continuation of application Ser. No. 869,610, filed Jan. 16, 1978, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3681020 |
Shah |
Aug 1972 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
764537 |
Dec 1956 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Martin et al., "Decomposition of Gypsum in a Fluidized-Bed Reactor", Bureau of Mines Report 6286, (1963), p. 7. |
Continuations (1)
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Number |
Date |
Country |
Parent |
869610 |
Jan 1978 |
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