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Production technique for extracting gallium from coal ash and coal gangue

A production process and coal gangue technology, which is applied in the field of production process for extracting gallium, can solve the problems of low extraction rate of gallium, large amount of residue, complicated process, etc., and achieve the effect of effective utilization and low equipment requirements.

Active Publication Date: 2008-09-03
潘爱芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a simple process, low energy consumption, high extraction rate of gallium in order to overcome the technical problems of low gallium extraction rate, high energy consumption, complex process, large amount of residue and low added value of residue utilization in the prior art. Gao's production process for extracting gallium from fly ash and coal gangue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Grind the fly ash so that the particle diameter is less than 200 mesh, preferably between 200-400 mesh, and mix the ground fly ash with Na 2 CO 3 By weight percent fly ash: mixing and stirring in the ratio of sodium carbonate=1:1;

[0029] (2) Calcining the mixture formed in step (1) at a temperature of 800° C. for 50 minutes;

[0030] (3) According to the ratio of sintered matter in weight percentage: water=1:50, add an appropriate amount of water to the sintered matter, leach at a temperature of 60° C. for 2 hours and then filter;

[0031] (4) feed CO in the concentrated filtrate gained in step (3) 2 , filtered after carbon separation for 2 hours to obtain H 2 SiO 3 and Al(OH) 3 mixture;

[0032] (5) add industrial hydrochloric acid in the filtrate of step (4) gained, make the pH of its solution be 3, pour in the activated sepiolite adsorption column that is equipped with, gallium is adsorbed on the column;

[0033] (6) The column of adsorbing gallium obtai...

Embodiment 2

[0035] (1) Grinding the coal gangue, and making its particle diameter 240 mesh, the coal gangue after grinding and Na 2 CO 3 Mix and stir in the ratio of fly ash: sodium carbonate=1:3;

[0036] (2) Calcining the mixture formed in step (1) at a temperature of 900° C. for 30 minutes;

[0037] (3) Add an appropriate amount of water to the sintered product, the Na 2 SiO 3 and NaAlO 2 Dissolved in water, according to weight percentage sintering: water = 1:85, leaching for 1 hour at a temperature of 80°C and then filtering;

[0038] (4) Pass into CO in step (3) gained filtrate 2 , filtered after carbon separation for 3 hours to obtain H 2 SiO 3 and Al(OH) 3 The mixture is filtered to obtain a silicon-aluminum mixture;

[0039](5) add industrial hydrochloric acid in the filtrate of step (4) gained, make the pH of its solution be 2, pour in the adsorption column that the activated sulfonic acid polystyrene series gel type cation exchange resin is housed, gallium is adsorbed ...

Embodiment 3

[0042] (1) Grind the fly ash to make the particle diameter 220 mesh, mix the ground fly ash with Na 2 CO 3 Mix and stir in the ratio of fly ash: sodium carbonate=1:2, and this ratio is percentage by weight;

[0043] (2) Calcining the mixture formed in step (1) at a temperature of 1000° C. for 1 hour;

[0044] (3) Add an appropriate amount of water to the sintered product, the Na 2 SiO 3 and NaAlO 2 Dissolved in water, according to weight percentage sintering: water = 1:200, leaching at a temperature of 95°C for 0.5 hours and then filtering;

[0045] (4) Pass into CO in step (3) gained filtrate 2 , filtered after carbon separation for 3 hours to obtain H 2 SiO 3 and Al(OH) 3 The mixture is filtered to obtain a silicon-aluminum mixture;

[0046] (5) add industrial hydrochloric acid in the filtrate of step (4) gained, make the pH of its solution be 1.0, pour in the adsorption column that activated montmorillonite is housed, gallium is adsorbed on the column;

[0047] (6...

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Abstract

The invention discloses a production process for extracting gallium from flyash and coal refuse, which recycles gallium by further deep utilizing the produced waste liquid on the basis of extracting alumina, silica gel from coal series solid waste. According to the invention, gallium chloride is acquired after middle temperature calcinations, leaching, carbon dioxide decomposition, direct adsorption on column, eluting, etc., problems of large slag and low slag utilization added value in current technology are solved, the extraction rate of gallium form flyash and coal refuse can reaches over 80%; the whole process is performed under normal atmosphere, thus the equipment requirement is low, resources are effectively utilized during the whole process, and no new pollution is caused to surrounding environment.

Description

technical field [0001] The invention belongs to the technical field of solid waste recovery and utilization, and in particular relates to a production process for extracting gallium from fly ash and coal gangue. Background technique [0002] Coal-based solid waste includes fly ash and coal gangue, which come from the mining, processing and utilization of coal. Coal gangue is a rock associated with coal, which is removed during coal mining and coal washing. Fly ash is coal combustion waste, which is the solid waste residue discharged from coal-fired power plants. At present, the total stockpile of coal-based solid waste in my country has exceeded 2 billion tons, and it is still increasing, which not only occupies a large amount of land resources, but also seriously pollutes the environment. [0003] In the near future, comprehensive utilization of fly ash and coal gangue must be implemented, and the goal of zero discharge of waste must be achieved through recycling. At pre...

Claims

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Application Information

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IPC IPC(8): C22B58/00C22B3/10
CPCY02P10/20
Inventor 潘爱芳杨胜科马润勇
Owner 潘爱芳
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