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Method for extracting lithium carbonate from coal ashes

A technology of fly ash and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, etc., to reduce pollution and save energy

Active Publication Date: 2015-04-01
宋英宏
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Problems solved by technology

Due to the low content of lithium and high content of calcium, magnesium and silicon in fly ash, there is no good method to extract lithium from fly ash economically and in large quantities

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  • Method for extracting lithium carbonate from coal ashes

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Embodiment Construction

[0023] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 Shown, the invention provides a kind of method extracting lithium carbonate from fly ash, described method may further comprise the steps:

[0025] Step 1: Grinding and grinding the fly ash filter cake after extracting alumina, activated carbon, iron oxide and sodium silicate, the fineness of the grinding particles ranges from 100 mesh to 200 mesh to obtain fly ash powder, and the powder The coal ash powder is put into the reaction kettle, mixed according to the ratio of fly ash to water mass ratio of 1:2 and stirred evenly to obtain fly ash slurry;

[0026] Step 2: After sealing the fly ash slurry obtained in the step 1 in the reaction kettle, feed carbon dioxide gas, ventilate for 1 to 3 hours, and then deflate to obtain a lithium bicarbonate mixed solution;

[0027] Step 3: filtering the lithium bicarbo...

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Abstract

The invention relates to the technical field of preparation of lithium carbonate. A method for extracting lithium carbonate from coal ashes provided by the invention comprises the following steps: crushing and grinding coal ash filter cakes to obtain coal ash powder; putting the coal ash powder into a reaction kettle, mixing with water, and stirring evenly, so as to obtain coal ash slurry; sealing the coal ash slurry in a reaction kettle, and introducing a carbon dioxide gas, so as to obtain a lithium bicarbonate mixed liquid; filtering the lithium bicarbonate mixed liquid for the first time, so as to obtain a first filter residue and a lithium bicarbonate liquid; putting the first filter residue into hot water, and carrying out hot melting, so as to obtain a lithium carbonate mixed hot liquid; filtering the lithium carbonate mixed hot liquid to obtain a lithium carbonate hot liquid and a second filter residue; mixing the lithium bicarbonate liquid with the lithium carbonate hot liquid, and carrying out crystallizing treatment, so as to obtain lithium bicarbonate crystal and a lithium bicarbonate liquid; adding alkali carbonate or a dilute hydrochloric acid liquid to the lithium bicarbonate liquid, and filtering to obtain a filtered material; and calcining the filtered material and lithium carbonate crystal, so as to obtain lithium carbonate.

Description

technical field [0001] The invention relates to the technical field of lithium carbonate preparation, in particular to a method for preparing lithium carbonate from fly ash. Background technique [0002] Lithium is the lightest metal element in nature and a very active alkali metal element. In the metallurgical industry, lithium can act as a deoxidizer and desulfurizer by utilizing the property that lithium can strongly react with substances such as O, N, Cl, and S. In addition, with the continuous development of battery technology and atomic energy industry, the demand for lithium continues to increase, and lithium is called "energy metal". At present, the raw materials for extracting lithium are mainly lithium ore and lithium-containing brine. Directly extracting lithium from ore requires high-temperature roasting, high-temperature and high-pressure acid leaching and other methods. These methods not only have relatively harsh conditions, but also have problems such as h...

Claims

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Application Information

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IPC IPC(8): C01D15/08
Inventor 刘建恩
Owner 宋英宏
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