Details:

Personal Author:
Wilson, R. D. (Rick D.) ; Anable, W. E.
Wilson, R. D. (Rick D.) ; Anable, W. E. Less -
Corporate Authors:
United States. Bureau of Mines
Description:
"Ten to twelve million tons of dust is produced by cement kilns annually in the United States, resulting in a serious waste disposal problem. The Bureau of Mines investigated two alkali volatilization methods for converting this dust into materials for making portland cement and a useful potassium product. Portland cement kiln dust was found to be composed of finely ground cement raw materials (caco3 and sio2) having a layer of alkali sulfate (k2so4 and na2so4). In this form, it cannot be directly recycled to cement kilns because concrete is weakened by a reaction between the alkali and the aggregate. Portland cements with 28-day strengths above 5,000 psi were produced from low-alkali residues using sintering and melting methods. For nearly complete removal of alkalies, primarily potassium sulfate, from cement kiln dust, a temperature above 1,300 deg. C and a reducing atmosphere were required." - NIOSHTIC-2

NIOSHTIC no. 10005361


Subject:
[+]
Alkalies.
Cement -- Analysis.

Series:
Report of investigations (United States. Bureau of Mines) ; 9032
Document Type:
Report
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:5502fa348a8e41d1b6be11c451a8b1e8af6f9d50fb906b0133f20ae4fb86f96b
File Type:

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