Behavior of Quartz, Kaolinite, and Pyrite during Alkaline Leaching of Coal

Supplemental Files
Date
1986
Authors
Fan, C.W.
Markuszewski, Richard
Wheelock, Thomas
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Journal Issue
Series
Abstract

Most of the mineral matter was extracted from Illinois No. 6 coal, a representative bituminous coal, by first leaching it with a hot alkaline solution and then with a dilute mineral acid. The alkalis employed, in decreasing effectiveness, were: (1) NaOH, (2) Na2CO3, (3) NaHCO3. The results generally agreed with those obtained in leaching quartz, kaolinite, and iron pyrite individually under similar conditions. The quartz was solubilized by the stronger alkalis. Kaolinite was largely converted to sodium hydroaluminosilicates such as analcime, hydroxycancrinite, and natrodavyne. A portion of the iron pyrite was converted to hematite, the amount depending on alkali strength and temperature. The sodium hydroaluminosilicates and hematite were subsequently extracted by acid.

Description

Reprinted (adapted) with permission from Mineral Matter and Ash in Coal, Chapter 34, pp 462–472. Copyright 1986 American Chemical Society.

Keywords
Citation
DOI
Collections