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A method for synergistic extraction of aluminum, silicon, lithium and gallium in fly ash

A technology of fly ash and combined method, applied in the direction of silicate, improvement of process efficiency, alkaline earth metal silicate, etc., can solve the problems of long treatment process, failure to fully utilize lithium resources, high energy consumption, etc., and achieve cost reduction Low, mild reaction conditions, high extraction selectivity

Active Publication Date: 2020-12-01
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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  • A method for synergistic extraction of aluminum, silicon, lithium and gallium in fly ash
  • A method for synergistic extraction of aluminum, silicon, lithium and gallium in fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0050] (1) Pre-desilication reaction: the fly ash described in Table 1 is mixed with 15% sodium hydroxide solution in mass fraction, and alkali dissolution reaction is carried out in the reactor, and the liquid-solid ratio of lye and fly ash is 3:1, the temperature of the alkali dissolution reaction is 90°C, the process of the alkali dissolution reaction is accompanied by stirring, the stirring speed is 300r / min, the time of the alkali dissolution reaction is 120min, and the desiliconization solution (lithium ion concentration 110ppm) and the Mixed slurry of silica fume and coal ash; then separated by filtration

[0051] (2) Bayer stripping: mix the desiliconized fly ash obtained in step (1) with the mother liquor for extracting gallium. The first Bayer stripping process uses a sodium aluminate solution with a caustic ratio of 3.5 for stripping, and the liquid-solid ratio is 2:1. , the reaction temperature is 200°C, and the reaction time is two hours; after the reaction, the B...

Embodiment 2

[0058] (1) Pre-desilication reaction: the fly ash described in Table 1 and the mass fraction are mixed with 20% sodium hydroxide solution, and the pre-desilication reaction is carried out in the reactor, the liquid-solid ratio of lye and fly ash The temperature is 2:1, the temperature of the alkali dissolution reaction is 100°C, the alkali dissolution reaction is accompanied by stirring, the stirring speed is 600r / min, the time of the alkali dissolution reaction is 90min, and the desiliconization solution (lithium ion concentration 140ppm) and Mixed slurry of desiliconized fly ash; separated by filtration

[0059] (2) Bayer stripping: mix the desiliconized fly ash obtained in step (1) with the mother liquor for extracting gallium. The first Bayer stripping process uses a sodium aluminate solution with a caustic ratio of 3.5 for stripping, and the liquid-solid ratio is 2:1. , the reaction temperature is 220°C, and the reaction time is two hours; after the reaction, the Bayer el...

Embodiment 3

[0066] (1) Pre-desilication reaction: the fly ash described in Table 1 and the mass fraction are mixed with 10% sodium hydroxide solution, and the pre-desilication reaction is carried out in the reactor, the liquid-solid ratio of lye and fly ash 4:1, the temperature of the alkali dissolution reaction is 120°C, the alkali dissolution reaction is accompanied by stirring, the stirring speed is 600r / min, the time of the alkali dissolution reaction is 150min, and the desiliconization solution (lithium ion concentration 70ppm) and Mixed slurry of desiliconized fly ash; separated by filtration

[0067](2) Bayer stripping: mix the desiliconized fly ash obtained in step (1) with the mother liquor for extracting gallium. The first Bayer stripping process uses a sodium aluminate solution with a caustic ratio of 3.5 for stripping, and the liquid-solid ratio is 2:1. , the reaction temperature is 180°C, and the reaction time is two hours; after the reaction, the Bayer eluate and Bayer eluat...

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Abstract

The invention discloses an extraction method for cooperating with an aluminum-silicon-lithium-gallium combination method in coal ash. The method comprises the steps of aluminum oxide extraction, wherein pre-desiliconization, dissolving-out through a Bayer method, dissolving-out of sub-molten salt, crystallization and separation, desilicication and seed precipitation are conducted; gallium extraction, wherein adsorption, drip washing, concentration and electrolysis are conducted; lithium extraction, wherein purification, adsorption, desorption, concentration and carbonation sedimentation; preparation of calcium silicate products, wherein causticization of desilicication liquid and dealkalization of desilicication residue are conducted. According to the extraction method, aluminum, silicon,lithium and gallium elements in the coal ash are comprehensively extracted through a whole-wet method, substep and stairstep comprehensive utilization of aluminum, silicon, lithium and gallium is achieved, energy consumption is low, the technological process is simple, the extraction rate of aluminum, lithium and gallium is high, the additional value of solid waste is effectively improved, and themethod is a good comprehensive utilization technology for processing the coal ash through a whole-alkali method and is suitable for industrialization popularization.

Description

technical field [0001] The invention relates to a method for resource utilization of fly ash from solid waste, in particular to a method for synergistically extracting aluminum, silicon, lithium and gallium from fly ash. Background technique [0002] With the development of my country's coal power industry, the output of fly ash has increased rapidly year by year, so the utilization of fly ash has become an urgent issue of comprehensive utilization of environmental protection resources. In recent years, with the gradual in-depth research on fly ash, especially high-alumina fly ash, it has been found that coal and fly ash in Inner Mongolia and Shanxi contain relatively high alumina content. High-alumina coal in Shanxi and other places is rich in gallium and lithium elements, which have high extraction value. Inner Mongolia Datang Renewable Resources Co., Ltd. has taken the lead in carrying out the research on the technology of extracting alumina from high-alumina fly ash by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14C01D15/08C01B33/24C22B58/00C22B3/12
CPCC01B33/24C01D15/08C01F7/14C22B3/12C22B58/00Y02P10/20
Inventor 李少鹏孙振华李会泉李占兵张建波
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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