Preparation of reactive beta-dicalcium silicate

Patent · Fri Jan 01 04:00:00 EST 1982

OSTI ID:864130

Shen, Ming-Shing ^[1]; Chen, James M ^[2]; Yang, Ralph T ^[3]

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1. Laramie, WY, NJ
2. Rahway, NJ
3. Amherst, NY

This invention relates to the preparation of fine particles of reactive beta-dicalcium silicate by means of a solid state process which comprises firing a mixture of calcium sulfate, silica and a reducing additive selected from the group consisting of calcium sulfide, carbon, carbon monoxide, methane and hydrogen, at a temperature of about 850.degree.-1000.degree. C. A carrier gas such as nitrogen or carbon dioxide may also be added, if desired. A high concentration of sulfur dioxide is a by-product of this process.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY
• DOE Contract Number: EY-76-C-02-0016
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4314980
• OSTI ID: 864130
• Country of Publication: United States
• Language: English

Related Subjects

-1000
/423/
850
added
additive
additive selected
beta-dicalcium
beta-dicalcium silicate
by-product
calcium
calcium silicate
calcium sulfate
calcium sulfide
carbon
carbon dioxide
carbon monoxide
carrier
carrier gas
comprises
concentration
consisting
degree
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dioxide
fine
fine particle
fine particles
firing
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hydrogen
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methane
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reactive
reactive beta-dicalcium
reducing
relates
selected
silica
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solid
sulfate
sulfide
sulfur
sulfur dioxide
temperature