Accession Number : AD0744226

Title :   Production of Fused Portland Cement and Sulphur Gas from Sulphatic Phosphorus-Containing Raw Materials with Added Fluorine,

Corporate Author : BUILDING RESEARCH STATION WATFORD (ENGLAND)

Personal Author(s) : Gudovich,L. A. ; Tenner,D. D. ; Bryantzev,B. A.

Report Date : JAN 1972

Pagination or Media Count : 10

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.

Descriptors :   (*CEMENTS, SYNTHESIS(CHEMISTRY)), SULFATES, CALCIUM COMPOUNDS, SULFUR, FLUORINE, MELTING, USSR

Subject Categories : Industrial Chemistry and Chemical Processing

Distribution Statement : APPROVED FOR PUBLIC RELEASE