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Method for comprehensively extracting aluminum and lithium from coal ash

A comprehensive extraction and fly ash technology, applied to chemical instruments and methods, lithium compounds, alkali metal compounds, etc., to achieve the effects of reducing raw material costs, simple process operation, and high comprehensive extraction rate

Active Publication Date: 2013-02-13
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the methods of extracting lithium and lithium salts at home and abroad are mainly extracted from solid minerals such as granite pegmatite lithium deposits and liquid minerals such as salt lake brine lithium deposits and seawater lithium deposits. There is no extraction of lithium from fly ash. to report
[0003] In addition, at present, there is no related technical research on the comprehensive extraction of aluminum and lithium from fly ash at home and abroad. Although there are many processes for extracting aluminum from fly ash, if the comprehensive The extraction rate has reached the maximum, but it is still in the exploration stage

Method used

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  • Method for comprehensively extracting aluminum and lithium from coal ash

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Embodiment 1

[0033] In step (B), the mass ratio of fly ash to sintering agent is 1:0.5, wherein the sintering agent is sodium carbonate, the temperature of the muffle furnace is 950°C, the heating and roasting time is 60min, and the clinker is self-pulverized The operation process is: naturally cool down to 750°C, keep at constant temperature for 20 minutes to complete self-powdering; in step (C), the volume ratio of liquid and solid is 1:50, the mass fraction of sodium carbonate solution is 10%, and the temperature of the electric heating plate is 90°C, the heating time is 120min; in step (D), the volume ratio of liquid and solid is 1:50, the mass fraction of sodium carbonate solution is 10%, the temperature of the electric heating plate is 90°C, and the heating time is 60min; in step In (E), carbon dioxide gas is introduced into the solution, and the ventilation is stopped when the pH of the solution is 7; in step (F), the mother liquor containing lithium is evaporated and concentrated at...

Embodiment 2

[0036] In step (B), the mass ratio of fly ash to sintering agent is 1:1.5, wherein the sintering agent is sodium carbonate, the temperature of the muffle furnace is 850°C, the heating and roasting time is 90min, and the clinker is self-pulverized The operation process is as follows: naturally cool down to 650°C, keep at a constant temperature for 20 minutes to complete self-powdering; in step (C), the volume ratio of liquid and solid is 1:50, the mass fraction of sodium carbonate solution is 10%, and the temperature of the electric heating plate is 150°C, the heating time is 90min; in step (D), the volume ratio of liquid and solid is 1:50, the mass fraction of sodium carbonate solution is 10%, the temperature of the electric heating plate is 150°C, and the heating time is 60min; in step In (E), carbon dioxide gas is introduced into the solution, and the ventilation is stopped when the pH of the solution is 7; in step (F), the mother liquor containing lithium is evaporated and c...

Embodiment 3

[0039] In step (B), the mass ratio of fly ash to sintering agent is 1:3, wherein the sintering agent is sodium carbonate, the temperature of the muffle furnace is 650°C, the heating and roasting time is 90min, and the clinker is self-pulverized The operation process is as follows: naturally cool down to 450°C, keep at a constant temperature for 20 minutes to complete self-powdering; in step (C), the volume ratio of liquid and solid is 1:50, the mass fraction of sodium carbonate solution is 10%, and the temperature of the electric heating plate is 200°C, the heating time is 120min; in step (D), the volume ratio of liquid and solid is 1:50, the mass fraction of sodium carbonate solution is 10%, the temperature of the electric heating plate is 200°C, and the heating time is 60min; in step In (E), carbon dioxide gas is introduced into the solution, and the ventilation is stopped when the pH of the solution is 7; in step (F), the mother liquor containing lithium is evaporated and co...

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Abstract

The invention provides a method for comprehensively extracting aluminum and lithium from coal ash. The method is characterized by comprising the following technological steps which are carried out in sequence: (A) desiliconizing and magnetically separating; (B) roasting; (C) primary dipping by alkali; (D) secondary dipping by alkali; (E) carbonizing, and precipitating aluminum; (F) purifying lithium mother liquor; and (G) evaporating, concentrating and precipitating lithium. The method has the advantages that silicon, iron, aluminum and lithium are sequentially extracted from the industrial coal ash, so that the waste is turned into treasure, the cost of the raw materials is reduced, the technological operation is simple and convenient, and the comprehensive extracting rate of aluminum lithium resources can be maximized; and the method is an ideal method for comprehensively extracting aluminum and lithium from the coal ash.

Description

technical field [0001] The invention relates to a method for comprehensively extracting aluminum and lithium from fly ash. Background technique [0002] At present, the production of aluminum resources at home and abroad mainly comes from the smelting of bauxite; in my country, due to the mass production of alumina, there is a sharp shortage of high-quality and high-grade bauxite resources. With the increasingly stringent national environmental protection policies and the shortage of aluminum resources The crisis has intensified, and the extraction of aluminum resources from high-alumina coal gangue, high-aluminum fly ash and high-alumina waste slag has become a major research topic for many domestic and foreign scholars. The process methods for extracting alumina or aluminum hydroxide or aluminum salt from fly ash mainly include alkali sintering and acid leaching. Among them, the process for extracting aluminum from fly ash by alkali sintering mainly includes calcium salt T...

Claims

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Application Information

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IPC IPC(8): C01F7/30C01D15/00B09B3/00
Inventor 孙玉壮李彦恒杨晶晶张健雅赵存良
Owner HEBEI UNIV OF ENG
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