Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Recovery of manganese from steel plant slag by carbamate leaching.

Authors
McIntosh-SN; Baglin-EG
Source
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9400, 1992 Jan; :1-10
NIOSHTIC No.
10011180
Abstract
The U.S. Bureau of Mines investigated the feasibility of using ammonium carbamate (NH2CO2NH4) leaching to recovery manganese from steel plant slag. This investigation showed that treatment of the slag in hydrogen prior to leaching enhanced manganese extraction. Up to 80 pct of the manganese and 50 pct of the iron could be extracted from a silicon steel slag that had been pretreated in hydrogen at 700 deg. C. Two 4-h leaching stages conducted at ambient temperature with a solution containing ammonia and carbon dioxide dissolved manganese and iron as their carbamate complexes. Heating the pregnant solution to 65 to 85 deg. C decomposed the complexes and precipitated the metals as insoluble carbonate salts. Ammonium carbamate leaching of other slags from several steelmaking plants produced lower manganese extractions, which suggests that the method cannot be applied satisfactorily to all steelmaking slags.
Keywords
Manganese-compounds; Metal-compounds; Metal-refining; Steel-industry; Foundries; Carbamates; Chemical-processing; Chemical-extraction
CAS No.
7439-96-5
Publication Date
19920101
Document Type
Report of Investigations
Fiscal Year
1992
NTIS Accession No.
PB92-174218
NTIS Price
A03
Identifying No.
RI-9400
NIOSH Division
RERC
Source Name
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9400
State
NV
TOP