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Pre-enrichment heavy liquid for extracting aluminum, lithium and gallium from fly ash and pretreatment method

A fly ash and pretreatment technology, which is applied in the field of heavy liquid for pretreatment and pretreatment, can solve the problems of undiscovered separation medium, difficult separation and recovery, environmental pollution, inaccurate density of heavy liquid, etc., so as to reduce production cost and reasonable Allocate resources and improve the effect of content

Inactive Publication Date: 2018-08-14
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to separate and recover organic reagents after they are mixed in different proportions, and there is serious environmental pollution. At the same time, the density of the newly prepared heavy liquid will be inaccurate when reused.
Therefore, no effective separation medium has been found for density classification of fly ash

Method used

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  • Pre-enrichment heavy liquid for extracting aluminum, lithium and gallium from fly ash and pretreatment method
  • Pre-enrichment heavy liquid for extracting aluminum, lithium and gallium from fly ash and pretreatment method
  • Pre-enrichment heavy liquid for extracting aluminum, lithium and gallium from fly ash and pretreatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The raw material is fly ash produced in the Xishan area of ​​Taiyuan City, Shanxi Province, and its chemical composition is shown in Table 1:

[0030] Table 1 Chemical composition list of Example 1

[0031]

[0032] 1) Prepare tribromomethane and ethanol according to the volume ratio of 2.04 to prepare a density of 2.4 g / cm 3 Add 100 ml of heavy liquid into a centrifuge tube with a capacity of 300 ml, and then add 100 ml of completely burned fly ash into the centrifuge tube, wherein, the lithium content in the fly ash is 180.81 ug / g, and the gallium content is 30.66 ug / g.

[0033] 2) Carry out centrifugation in a centrifuge, the speed of the centrifuge is 2000 r / min, and the centrifugation time is 20 min.

[0034] 3) Filtrate the suspended solids and suspended solids obtained by centrifugation in a vacuum filter, and add ethanol solution during the filtering process to rinse the organic solvent adhering to the fly ash particles.

[0035] 4) Distill the filtered li...

Embodiment 2

[0039] The raw material is fly ash produced by a power plant in Xishan District, Taiyuan City, Shanxi Province, and its chemical composition is shown in Table 2:

[0040] Table 2 Example 2 chemical composition list

[0041]

[0042] 1) Prepare tribromomethane and ethanol at a volume ratio of 0.92 to prepare a density of 1.8 g / cm 3 100 ml of heavy liquid is added to a centrifuge tube with a capacity of 300 ml, and then 100 ml of completely burned fly ash is added to the centrifuge tube, wherein the aluminum content in the fly ash is 112.63 ug / g, and the lithium content is 112.63 ug / g. The gallium content is 31.37 ug / g.

[0043] 2) Carry out centrifugation in a centrifuge, the speed of the centrifuge is 3000 r / min, and the centrifugation time is 30 min.

[0044] 3) Filtrate the suspended solids and suspended solids obtained by centrifugation in a vacuum filter, and add ethanol solution during the filtration process to wash away the organic solvent adhering to the fly ash pa...

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Abstract

The invention discloses a pre-enrichment heavy liquid for extracting aluminum, lithium and gallium from fly ash and a pretreatment method, and relates to the technical field of resource utilization ofsolid waste fly ash. The pre-enrichment heavy liquid comprises bromoform and ethanol, and the density of the prepared heavy liquid is 1.8-2.4g / cm3. The pretreatment method comprises the processes ofheavy liquid preparation, centrifugal separation, filtration, atmospheric distillation, heavy liquid recovery and fly ash drying. The invention provides the method that fly ash is subjected to floating-sinking pretreatment and the fly ash is divided into two density grades. The selected heavy liquid is easy to prepare and can be recycled, the cost is saved without causing pollution to surroundingenvironment, and the content of aluminum, lithium and gallium in the high-density fly ash obtained by sorting is greatly increased; and at the same time, the treatment amount in the extraction processis reduced, the reasonable and efficient utilization of the fly ash can be realized, the method can be used for the pretreatment process of the fly ash when aluminum, lithium and gallium are extracted from the fly ash, and the effective enrichment of aluminum, lithium and gallium elements can be carried out.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste fly ash, in particular to a pretreatment heavy liquid for extracting aluminum lithium gallium from fly ash and a pretreatment method. Background technique [0002] With the development of my country's coal power industry, China's average annual release of fly ash is close to 600 million tons, but there are still nearly 100 million tons of fly ash that cannot be properly disposed and utilized, especially in Shanxi, Inner Mongolia, Xinjiang and other power plant-rich areas, so the rational use of fly ash is an urgent issue of environmental protection and efficient use of resources. With the gradual deepening of research on fly ash, the extraction of beneficial elements in fly ash has become an efficient and economical utilization direction. Shenhua Zhungeer Energy Co., Ltd. successfully produced the first batch of metal gallium in its test line by using the acid-based gal...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B26/12C22B21/00C22B58/00C04B18/08
CPCC04B18/08C22B7/006C22B7/02C22B21/0023C22B26/12C22B58/00Y02P10/20Y02W30/91
Inventor 孙蓓蕾曾凡桂刘云霞贾鹏
Owner TAIYUAN UNIV OF TECH
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