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Technical method for comprehensively extracting aluminum and lithium from coal ash through acid process

A technology of comprehensive extraction and process method, which is applied in the field of comprehensive extraction of aluminum and lithium from fly ash by acid treatment, and achieves the effects of large comprehensive extraction rate, reduction of raw material cost, and simple process operation.

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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  • Technical method for comprehensively extracting aluminum and lithium from coal ash through acid process

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Embodiment 1

[0035] In step (B), the mass ratio of fly ash to sintering agent is 1:1, wherein the sintering agent is a mixture of potassium sulfate and sodium sulfate with a mass ratio of 0.7:0.3, and the temperature of the muffle furnace is 1050°C. The incineration time is 60 minutes, and the operation process of clinker self-powdering is as follows: natural cooling to 850°C, constant temperature for 20 minutes to complete self-powdering; in step (C), the volume ratio of liquid and solid is 2:1, the temperature of the electric heating plate 200°C; in step (D), the volume ratio of liquid to solid is 2:1, deionized water is 100ml, the temperature of the water bath is 60°C, and the water bath is heated for 40 minutes; in step (F), during the carbonation treatment, control When ventilating, the initial temperature of the solution is 75°C, the rate of carbon dioxide ventilating is 3.5L / min, and the ventilating is stopped when the pH of the solution is 7; in step (G), the lithium-containing moth...

Embodiment 2

[0038] In step (B), the mass ratio of fly ash to sintering agent is 1:1.5, wherein the sintering agent is a mixture of potassium sulfate and sodium sulfate with a mass ratio of 1:0.5, and the temperature of the muffle furnace is 950°C. The incineration time is 90 minutes, and the operation process of clinker self-powdering is as follows: naturally cool down to 750°C, and keep at a constant temperature for 20 minutes to complete self-powdering; in step (C), the volume ratio of liquid and solid is 2:1, and the temperature of the electric heating plate 200°C; in step (D), the volume ratio of liquid to solid is 2:1, deionized water is 100ml, the temperature of the water bath is 80°C, and the water bath is heated for 20 minutes; in step (F), during the carbonation treatment, control When ventilating, the initial temperature of the solution is 75°C, the rate of carbon dioxide ventilating is 3.5L / min, and the ventilating is stopped when the pH of the solution is 7; in step (G), the li...

Embodiment 3

[0041] In step (B), the mass ratio of fly ash to sintering agent is 1:2, wherein the sintering agent is a mixture of potassium sulfate and sodium sulfate with a mass ratio of 1:1, and the temperature of the muffle furnace is 650°C. The incineration time is 120min, and the operation process of clinker self-powdering is as follows: natural cooling to 450°C, constant temperature for 20min to complete self-powdering; in step (C), the volume ratio of liquid and solid is 2:1, the temperature of the electric heating plate 200°C; in step (D), the volume ratio of liquid to solid is 2:1, deionized water is 100ml, the temperature of the water bath is 40°C, and the water bath is heated for 60 minutes; in step (F), during the carbonation treatment, control When ventilating, the initial temperature of the solution is 75°C, the rate of carbon dioxide ventilating is 3.5L / min, and the ventilating is stopped when the pH of the solution is 7; in step (G), the mother liquor containing lithium is e...

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Abstract

The invention provides a technical method for comprehensively extracting aluminum and lithium from coal ash through an acid process. The method is characterized by comprising the following technological steps which are carried out in sequence: (A) desiliconizing and magnetically separating; (B) thermally processing; (C) acidizing and roasting; (D) leaching; (E) removing residues; (F) carbonizing, and precipitating aluminum; (G) purifying lithium mother liquor; and (H) evaporating, concentrating and precipitating lithium. The method has the advantages that the 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 source and lithium resources can be maximized; and the method is an ideal method for comprehensively extracting aluminum and lithium from the coal ash through the acid process.

Description

technical field [0001] The invention relates to a process for comprehensively extracting aluminum and lithium from fly ash by acid treatment. 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. Salt processing methods mainly include DAL method (Direct Acid Leaching), fluoride-assisted ...

Claims

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Application Information

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IPC IPC(8): C01F7/30C01D15/00B09B3/00
CPCY02W30/20
Inventor 孙玉壮杨晶晶李彦恒张健雅赵存良
Owner HEBEI UNIV OF ENG
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