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Na2cr04 from Domestic Chromite Concentrates by an Alkali-fusion Method.

Authors
Hundley-GL; Mussler-RE; Holmes-RA; Olsen-RS
Source
MISSING :12 pages
Link
NIOSHTIC No.
10006005
Abstract
The Bureau of Mines has devised a procedure to recover chromium chemicals from concentrates derived from low-grade domestic chromites. These domestic chromites contain silicon and aluminum impurities at levels that are too high to permit processing by present industrial processes. The Bureau procedure consists of reacting chromite with molten naoh under oxidizing conditions to form sodium chromate (na2cro4). The reaction product is leached with methanol to recover the majority of the unreacted naoh, then with water to extract the na2cr04, and the remainder of the naoh. The na2cro4 product is recovered by evaporative crystallization from the aqueous solution. This report presents laboratory results of studies to determine the optimum leaching conditions for the reaction products of several domestic chromite concentrates. Results of solution purification and crystallization studies are also presented. The concentrates are from a variety of sources including the Stillwater Complex in Montana, Red Bluff Bay and the Kenai Peninsula in Alaska, and a ni-co laterite from southern Oregon. Sodium chromate crystals were produced that contained less than 0.01 pct naoh.
Publication Date
19880101
Document Type
IH; Report of Investigations;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
RI 9167
NIOSH Division
ALRC;
Source Name
MISSING
State
AK; MT; OR;
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