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Method for extracting gallium from fly ash

A technology of fly ash and wet method, which is applied in the field of gallium metal extraction, can solve the problems of low resin adsorption efficiency, low leaching rate, and high production cost, and achieve the effects of improved iron removal effect, high leaching rate, and low production cost

Inactive Publication Date: 2010-10-20
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low reaction temperature of fly ash and hydrochloric acid in this method (60°C), the leaching rate of gallium is low (35.2%); in addition, the resin used in this method is leaching resin (CL-TBP), and its working principle Similar to the mechanism of solvent extraction, it is obtained by co-polymerizing and curing the active groups of the extractant with the resin. The adsorption efficiency of the resin is low, and the production cost is high

Method used

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  • Method for extracting gallium from fly ash
  • Method for extracting gallium from fly ash
  • Method for extracting gallium from fly ash

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Experimental program
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Effect test

Embodiment 1

[0052] (1) Get circulating fluidized bed fly ash, pulverize to 200 orders, use embodiment 11 to be used for the vertical ring magnetic separator of fly ash to remove iron to carry out wet magnetic separation and make the iron oxide content in the ash drop to 0.8wt %. The filter cake after the magnetic separation is put into an acid-resistant reaction kettle, and the industrial hydrochloric acid with a concentration of 37wt% is added to carry out acid-dissolving reaction. The molar ratio of HCl in hydrochloric acid to alumina in fly ash is 4.5:1, and the reaction temperature is 200°C. Pressure 2.1MPa, reaction time 1 hour. After the reaction product was filtered and washed by a basket filter press, a hydrochloric acid leaching solution with a pH value of 1.7 was obtained. It was determined that the leaching rate of gallium in the fly ash was 84.2%.

[0053] (2) After cooling the hydrochloric acid immersion solution to 65°C through heat exchange, use a corrosion-resistant pump ...

Embodiment 2

[0058] Except step (1), other operating process conditions are all identical with embodiment 1. The operating process condition adjustment in the step (1) is:

[0059] (1) Get circulating fluidized bed fly ash, pulverize to 150 orders, use the vertical ring magnetic separator that is used for fly ash iron removal of embodiment 11 to carry out wet magnetic separation and make the iron oxide content in the ash drop to 0.8 wt%. The filter cake after the magnetic separation is put into the acid-resistant reaction kettle, and the industrial hydrochloric acid with a concentration of 28wt% is added to carry out the acid-dissolving reaction. Pressure 1.0MPa, reaction time 2 hours. The reaction product was filtered and washed by a basket filter press to obtain a hydrochloric acid leaching solution with a pH value of 1.5. It was determined that the leaching rate of gallium in the fly ash was 82.8%.

[0060] After determination, the content of gallium in the product is 99.9%.

Embodiment 3

[0062] Except step (1), other operating process conditions are all identical with embodiment 1. The operating process condition adjustment in the step (1) is:

[0063] (1) Get circulating fluidized bed fly ash, pulverize to 200 orders, use embodiment 11 to be used for the vertical ring magnetic separator of fly ash to remove iron to carry out wet magnetic separation and make the iron oxide content in the ash drop to 0.8wt %. Put the filter cake after magnetic separation into an acid-resistant reaction kettle, add industrial hydrochloric acid with a concentration of 20wt% to carry out acid-dissolving reaction, the molar ratio of HCl in hydrochloric acid to alumina in fly ash is 8:1, and the reaction temperature is 100°C. The pressure is 0.1MPa, and the reaction time is 4 hours. The reaction product was filtered and washed by a basket filter press to obtain a hydrochloric acid leaching solution with a pH value of 1.4. It was determined that the leaching rate of gallium in the ...

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Abstract

The invention discloses a method for extracting gallium metal from fly ash of a fluidized bed. The method comprises the following steps of: crushing the fly ash, performing wet magnetic separation to remove iron, and reacting the fly ash with hydrochloric acid to obtain hydrochloric acid extract; b) introducing the hydrochloric acid extract into a macroreticular cation resin column for gallium adsorption and eluting the resin column by using eluant to obtain eluent; c) adding sodium hydroxide solution into the eluent to perform reaction to obtain gallium-containing sodium metaaluminate solution; d) introducing carbon dioxide into the gallium-containing sodium metaaluminate solution for carbonation to separate the gallium from the aluminum so as to obtain aluminum gallium double salt of which the mass ratio of the gallium to aluminum oxide is greater than 1 to 340; and e) adding the aluminum gallium double salt into the sodium hydroxide solution to perform reaction so as to obtain the gallium-containing aluminum alkaline solution by adjusting the alkalinity and performing concentration; and finally performing electrolysis to obtain the gallium metal. The method has the advantages of simple process, high yield, low cost and stable product quality; and the obtained gallium metal product has gallium content of greater than or equal to 99.9 percent and reaches 3N level.

Description

technical field [0001] The invention relates to a method for extracting gallium metal from fly ash, and is especially suitable for the method for extracting gallium metal from fly ash in a circulating fluidized bed. Background technique [0002] Gallium is a very important semiconductor material with a wide range of uses. The price in the international market is extremely high, and the market prospect is promising. However, the reserve of gallium is relatively small, and its content in the earth's crust is about 1.5 / 10,000. It hardly forms minerals and usually enters other minerals in the form of isomorphism, so its extraction is quite difficult. In nature, gallium is mostly symbiotic with aluminum, zinc, etc. in minerals. Therefore, the important raw materials for extracting gallium are zinc sulfide ore and bauxite ore. At present, 90% of the gallium in the world is obtained from the by-product of the alumina industry with bauxite as the main raw material. The mother liq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B58/00
CPCC25C1/22C22B3/10C22B58/00C22B7/007C22B7/02C22B3/42C22B3/44B03C1/03B03C1/032B03C1/0335B03C2201/18Y02P10/20
Inventor 蒋引珊魏存弟李楠杨殿范池君洲邹萍
Owner CHINA SHENHUA ENERGY CO LTD
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