Production of Fused Portland Cement and Sulphur Gas from Sulphatic Phosphorus-Containing Raw Materials with Added Fluorine,
Abstract
Previous work has established that when CaSO4 is heated to 1350C a eutectic is formed with the composition: CaSO4 - 88%, CaO - 12%. When phosphoanhydrite (obtained from phosphogypsum) which in addition to an admixture of calcium phosphate also contains about 0.4% of fluorine is heated, the temperature of the eutectic is reduced to 1270C and the level of dissociation of CaSO4 at this temperature corresponds to a CaO content of 16.7%. Research was conducted to use this system to produce Portland cement clinker without having to employ huge rotary kilns. Studies were made of the process of dissociation of CaSO4 in a molten Portland cement raw materials mix in oxidising and in slightly reducing media.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1972
- Accession Number
- AD0744226
Entities
People
- B. A. Bryantzev
- D. D. Tenner
- L. A. Gudovich