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Desilicated Kaolin for High Alumina Refractories.

Authors
Koch-RK; Traut-DE; Henry-JL
Source
For Reference Only At Bureau Libraries :27 pages
Link
NIOSHTIC No.
10004615
Abstract
The Bureau of Mines studied, on a limited basis, the preparation of high-alumina refractory-grade material from domestic kaolin clay as a substitute for refractory-grade bauxite. After calcination to remove water of hydration, the crushed clay was desilicated by a naoh-koh aqueous solution leach then dealkalized by a hydrochloric acid wash. Alternative desilication leaches with naoh and koh individually proved less effective. Alternative dealkalization with carbonic acid was also tested but proved unsuccessful. Substantial removal of iron and partial removal of titanium was effected by high- temperature hydrochlorination prior to desilication, but this might prove economically unfeasible. A typical final product after processing contained, in wt pct, 81.5 Al203, 11.2 Si02, 4.6 Tio2, 0.3 Fe2o3, 0.15 K2o, and 0.12 Na2o. Refractory evaluation of this material indicated a pyrometric cone equivalent value of 36 to 37 and a modulus of rupture value of 105 psi at 1,400 deg. C, both values being lower than desired. Further reduction of the titania content was suggested to attain adequate refractory properties.
Publication Date
19850101
Document Type
CP;
Fiscal Year
1985
NTIS Accession No.
NTIS Price
Identifying No.
OFR 85-85
NIOSH Division
ALRC;
Source Name
For Reference Only At Bureau Libraries
State
WA;
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