Alumina and Silica Produced by Chlorination of Power Plant Fly Ash Treatment

被引：11

作者：

Kaplan, Valery ^{[1
]}

Dosmukhamedov, Nurlan ^{[2
]}

Zholdasbay, Erzhan ^{[2
]}

Daruesh, Galamat ^{[2
]}

Argyn, Aidar ^{[2
]}

机构：

[1] Weizmann Inst Sci, 234 Herzl St,POB 26, IL-7610001 Rehovot, Israel

[2] Satbayev Univ, Satbayev St 22, Alma Ata 050013, Kazakhstan

来源：

JOM | 2020年 / 72卷 / 10期

关键词：

Alumina - Chlorination - Coal ash - Molar ratio - Mullite - Aluminum oxide - Extraction - Coal combustion - Silica - Gas plants;

D O I：

10.1007/s11837-020-04267-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We describe a process of chlorination of fly ash with either chlorine gas or calcium chloride, which successfully decomposes mullite and permits the extraction of a number of industrially useful, acid-soluble compounds. As a guide for determining optimal input molar ratios and temperatures, the Gibbs energies for three groups of reactions of major fly ash components between 973 K and 1473 K were calculated: (1) chlorination with chlorine gas; (2) chlorination with chlorine gas in the presence of coal; (3) chlorination with calcium chloride. Laboratory-scale measurements with fly ash from six coal combustion power plants in Kazakhstan show that chlorination with either calcium chloride or chlorine gas allows efficient extraction of alumina (alpha-Al2O3) and silica with both high yield and purity.

引用

页码：3348 / 3357

页数：10

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