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Upgrading High-iron Chromite Concentrates by Carbonyl Processing.

Authors
Visnapuu-A; Dressel-WM
Source
Ch 16 in Process Mineralogy III Soc Min Eng AIME New York 1984 :259-274
Link
NIOSHTIC No.
10004215
Abstract
The Bureau of Mines, U.S. Department of the Interior, has upgraded high-iron domestic chromite concentrate to high-chromium concentrate by a laboratory carbonyl process. The chromite concentrate product has a chromium-to-iron ratio in excess of 3:1 compared with the starting concentrate ratio of 1.6:1. The high-iron chromite was first reduced to convert the iron oxides to the metal, and then treated with carbon monoxide at elevated pressures and low temperatures to convert the metallic iron fraction to iron pentacarbonyl. Carbonylation was accelerated by the addition of hydrogen sulfide in small quantities. A constant flow of carbon monoxide swept the iron pentacarbonyl formed in the reactor out through a pressure-reducing valve. The mixture of carbon monoxide and iron pentacarbonyl at atmospheric pressure was then passed through a heated section to decompose the iron pentacarbonyl to carbon monoxide and iron, whereupon the latter plated out on the heated surface. Carbon monoxide pressure, temperature, and promoter trends for enhanced carbonylation are presented.
Publication Date
19840101
Document Type
OP;
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
OP 140-84
NIOSH Division
RORC;
Source Name
Ch. 16 in Process Mineralogy III Soc. Min. Eng. AIME, New York, 1984, PP. 259-274
State
NY;
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