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

Acid Sulfation of Alunite.

Authors
Froisland-LJ; Wouden-ML; Harbuck-DD
Source
MISSING :12 pages
Link
NIOSHTIC No.
10006814
Abstract
The U.S. Bureau of Mines conducted laboratory studies on sulfuric acid (h2so4) digestion of alunite [kal3(so4)2(oh)6] as a means for treating domestic deposits of this mineral. Digesting alunite ore in boiling h2so4 at concentrations of 88-wt-pct acid or higher breaks down the alunite and permits a convenient separation of potassium and aluminum. The digestion reaction is a complex sulfation reaction occurring in two stages. In this reaction, the potassium component extracts into the h2so4 for eventual recovery as potassium sulfate (k2so4) in a separate unit operation. Aluminum is left as acid-insoluble aluminum sulfate [al2(so4)3], which can be extracted by a 95 deg. C water leach. Additional purification of al2(so4)3 produced in this study is needed to meet cell-grade alumina (al203) purity specifications. Extraction and separation of potassium and aluminum from the alunite ore were consistently above 90 pct.
Publication Date
19890101
Document Type
IH; Report of Investigations;
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
RI 9222
NIOSH Division
SLRC;
Source Name
MISSING
TOP