KR890701714A - Degeneration and Reduction of Fly Ash - Google Patents

Abstract

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Description

Degeneration and Reduction of Fly Ash

Since this is an open matter, no full text was included.

1 is a graph of cumulative yield versus cumulative ash of starting coal and treated coal under the conditions of Example 7. FIG.

Claims (19)

(a) forming an aqueous solution of an effective amount of a compound capable of reacting with at least one mineral selected from the group consisting of ammonium salts, organic acids, organic complexing agents capable of forming complex salts with metal ions, polyhydric alcohols and polysaccharides, and (b At a temperature below the boiling point of the solution, the carbonaceous material is added to the solution for a time sufficient to allow the compound to react with at least one mineral to selectively remove or chemically modify at least one mineral contained in the carbonaceous material. And (c) subsequently cleaning the carbonaceous material with water, wherein the carbonaceous material containing at least one mineral is refined. The method of claim 1, wherein steps (a), (b) and (c) are repeated sequentially using different compounds from the group at each iteration of step (a). The method of claim 1 or 2, wherein the carbonaceous material is coal. The method of any one of claims 1 to 3, wherein the carbonaceous material is ground before contacting the solution. The method according to any one of claims 1 to 4, wherein the carbonaceous material has a particle size of 3 mm or less. The method of any one of claims 1 to 5, wherein step (c) is for 30 to 45 minutes. The method of claim 1, wherein the compound is acetate, sulfate, chloride, citrate, hydroxide, carbonate, bicarbonate and oxalate. The method according to any one of claims 1 to 6, wherein the compound is selected from citric acid, acetic acid, ascorbic acid, oxalic acid, formic acid, stearic acid, succinic acid and adipic acid. The compound according to any one of claims 1 to 6, wherein the compound can form a complex salt with a metal cation selected from ethylenediamine tetraacetic acid, disodium salt of ethylene diamine tetraacetic acid, 8-hydroxyquinoline and mercaptoethanol. Method that is an organic complexing agent. The method according to any one of claims 1 to 6, wherein the compound is a polyhydric alcohol selected from glycerol, glycol, ethylene glycol, propylene glycol, sorbitol, mannitol, and pentitol. The method according to any one of claims 1 to 6, wherein the compound is a polysaccharide selected from sucrose, maltose, dextrose, lactose, starch, glycogen, cellulose, cellulose derivatives and galactose. The method of claim 1, wherein the at least one mineral is an exchangeable mineral and / or a feldspar. The method of claim 1, wherein the at least one mineral is a sulfate mineral and the compound is an ammonium salt. The method of claim 13, wherein the sulfate mineral is selected from gypsum and basanite. The method of any one of claims 1 to 6, wherein the at least one mineral is an alkali mineral and / or a sulfate mineral and the compound is an organic acid. 16. The method of claim 15, wherein the alkali mineral is selected from calcite, dolomite and meteorite. The method according to claim 1, wherein the at least one mineral is a sulfate mineral and / or a phosphate mineral and / or an alkaline clay and the compound is an organic complexing agent. The method according to claim 1, wherein the at least one mineral is a sulfate mineral and / or a phosphate mineral and / or alkaline clay and the compound is a polyhydric alcohol. Carbonaceous material prepared by the method according to any one of the above. ※ Note: The disclosure is based on the initial application.