Method for extracting lithium from fly ash

A fly ash, lithium ion technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of long processing process, failure to fully utilize lithium resources, high energy consumption, and achieve low equipment requirements, Low price and low energy consumption

Active Publication Date: 2016-06-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw material used in this process is the desiliconized fly ash obtained through the desiliconization process of fly ash, which fails to make full use of lithium resources, and the roasting process consumes a lot of energy, and the post-calcination treatment process is relatively long.

Method used

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  • Method for extracting lithium from fly ash
  • Method for extracting lithium from fly ash
  • Method for extracting lithium from fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) alkali dissolution reaction: the fly ash described in table 1 is mixed with the sodium hydroxide solution of 15% in mass fraction, carries out alkali dissolution reaction in reactor, and the liquid-solid ratio of lye and fly ash is 3 : 1, the temperature of alkali-dissolution reaction is 90 ℃, with stirring in the alkali-dissolution reaction process, stirring speed is 300r / min, the time of alkali-dissolution reaction is 120min, obtains containing silicon-lithium eluate (lithium ion concentration 110ppm) and desorbed Mixed slurry of silica fume and coal ash;

[0051] (2) Filtration and washing: the mixed slurry is filtered and separated to obtain filter residue and filtrate, and the filter residue is washed. The liquid-solid volume ratio in the process of washing the filter residue is 1:1. The liquid is mixed to obtain a mixed liquid;

[0052] (3) Adsorption: The mixed solution passes through the adsorption column loaded with lithium ion exchange resin at a flow rat...

Embodiment 2

[0059] (1) alkali dissolution reaction: the fly ash described in table 1 is mixed with the sodium hydroxide solution of 20% by mass fraction, carry out alkali dissolution reaction in the reactor, the liquid-solid ratio of lye and fly ash is 2 : 1, the temperature of alkali-dissolution reaction is 95 ℃, with stirring in the alkali-dissolution reaction process, stirring speed is 400r / min, the time of alkali-dissolution reaction is 80min, obtains containing silicon lithium eluate (lithium ion concentration 160ppm) and desorbed Mixed slurry of silica fume and coal ash;

[0060] (2) Filtration and washing: the mixed slurry is filtered and separated to obtain filter residue and filtrate, and the filter residue is washed. The liquid-solid volume ratio in the process of washing the filter residue is 1:1. The liquid is mixed to obtain a mixed liquid;

[0061] (3) Adsorption: The mixed solution passes through the adsorption column loaded with manganese ion sieve at a flow rate of 40L / m...

Embodiment 3

[0068] (1) alkali dissolution reaction: the fly ash described in table 1 is mixed with the sodium hydroxide solution of 10% by mass fraction, carries out alkali dissolution reaction in reactor, and the liquid-solid ratio of lye and fly ash is 4 : 1, the temperature of alkali-dissolution reaction is 100 ℃, with stirring in the alkali-dissolution reaction process, stirring speed is 400r / min, the time of alkali-dissolution reaction is 120min, obtains containing silicon-lithium eluent (95ppm of lithium ion concentration) and desorbed Mixed slurry of silica fume and coal ash.

[0069] (2) Filtration and washing: the mixed slurry is filtered and separated to obtain filter residue and filtrate, and the filter residue is washed. The liquid-solid volume ratio in the process of washing the filter residue is 1:1. The liquid is mixed to obtain a mixed liquid;

[0070] (3) Adsorption: The mixed solution passes through the adsorption column loaded with manganese ion sieve at a flow rate of...

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Abstract

The invention discloses a method for extracting lithium from fly ash. The method comprises a process including the steps of carrying out one-step alkali dissolving, filtering, washing, adsorbing, desorbing, concentrating and carrying out carbonation precipitation. The main process comprises the following steps: carrying out an alkali dissolving reaction on the fly ash and an alkali solution; after finishing the reaction, carrying out solid-liquid separation and washing, and adsorbing obtained filtrate and washing solution by a lithium ion adsorbent; desorbing lithium ions and concentrating; adding a precipitating agent into a concentrated solution and carrying out lithium precipitation operation; after finishing precipitation, filtering, washing and drying to obtain a solid, namely a lithium carbonate product prepared from the fly ash. The invention provides the simple and efficient method for extracting the lithium from the fly ash; the method has a wide raw material source and has the advantages of simple process, moderate reaction conditions, no influence on subsequent treatment of the filtrate and filter residues and capability of effectively controlling impurities; the extraction rate is more than 60 percent and the method is applicable to industrial popularization.

Description

technical field [0001] The invention relates to a method for extracting lithium from fly ash, a solid waste containing lithium, in particular to a method for extracting lithium from fly ash to prepare lithium carbonate. Background technique [0002] Lithium is an important metal element widely used in energy, metallurgy, glass, ceramics, rubber and grease. At present, there are two main sources of lithium: one is the lithium salt compound obtained by extracting lithium ions in salt lake brine through extraction, adsorption, salting-out or co-precipitation; the other is lithium-containing ores such as Lithium salt compounds are produced from lepidolite or spodumene by roasting or acid method. With the development of the new energy industry, especially the rapid development of lithium batteries, the demand for lithium continues to increase rapidly, resulting in a tense demand for lithium salts. [0003] With the development of my country's coal power industry, the output of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 李少鹏孙振华李会泉包炜军李占兵
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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