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Method for extracting aluminum

An extraction method, high-aluminum fly ash technology, applied in the field of aluminum extraction, can solve the problems of large alkali circulation volume and high causticity of sodium aluminate crude liquid, and achieve high efficiency, energy consumption, high extraction efficiency, and lower impregnation temperature Effect

Inactive Publication Date: 2019-08-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alkali hydrothermal method has the disadvantages of a very large amount of alkali circulation and a relatively high causticity of the produced sodium aluminate crude liquid

Method used

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  • Method for extracting aluminum
  • Method for extracting aluminum

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Effect test

Embodiment 1

[0028] The invention discloses an aluminum extraction method, which adopts basic compound and fly ash to form, roasts, and then acid leaches the sintered sample block to obtain aluminum-containing crude liquid; the basic compound is sodium hydroxide; the basic compound and powder The mass ratio of coal ash is 0.8; the molding and roasting process is as follows: after the dried fly ash and the basic compound are ground and mixed in proportion, under 0.5MPa, continue for 1min, and the specification of the compacted green body is a cylinder (20.0mm ×10.0mm), then put into a muffle furnace and heat to a certain temperature and constant temperature for a period of time, then cool to obtain sintered clinker; the certain temperature is 825°C; the constant temperature time is 150min; the acid leaching process is : Grinding the sintered clinker, mixing and stirring with 3mol / L sulfuric acid in proportion to leaching, suction filtration, washing the filter residue with water, and separat...

Embodiment 2

[0030] The invention discloses an aluminum extraction method, which adopts basic compound and fly ash to form, roasts, and then acid leaches the sintered sample block to obtain aluminum-containing crude liquid; the basic compound is sodium hydroxide; the basic compound and powder The mass ratio of coal ash is 1.5; the molding and roasting process is as follows: after drying the fly ash and the basic compound are ground and mixed in proportion, under 0.5MPa, continue for 1min, and the compacted green body specification is a cylinder (20.0mm ×10.0mm), then put into a muffle furnace and heat to a certain temperature and constant temperature for a period of time, then cool to obtain sintered clinker; the certain temperature is 825°C; the constant temperature time is 150min; the acid leaching process is : Grinding the sintered clinker, mixing and stirring with 3mol / L sulfuric acid in proportion to leaching, suction filtration, washing the filter residue with water, and separation by...

Embodiment 3

[0032] The invention discloses an aluminum extraction method, which adopts basic compound and fly ash to form, roasts, and then acid leaches the sintered sample block to obtain aluminum-containing crude liquid; the basic compound is sodium hydroxide; the basic compound and powder The mass ratio of coal ash is 0.5; the molding and roasting process is as follows: after the dried fly ash and the basic compound are ground and mixed in proportion, under 0.5MPa, continue for 1min, and the specification of the compacted green body is a cylinder (20.0mm ×10.0mm), then put into a muffle furnace and heat to a certain temperature and constant temperature for a period of time, then cool to obtain sintered clinker; the certain temperature is 825°C; the constant temperature time is 150min; the acid leaching process is : Grinding the sintered clinker, mixing and stirring with 3mol / L sulfuric acid in proportion to leaching, suction filtration, washing the filter residue with water, and separat...

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Abstract

The invention discloses an extracting method of aluminum. Basic compounds and fly ash are adopted for forming, and sintering is performed; then a sintered sample block is subjected to acid leaching, and aluminum-containing crude liquid is obtained; the roasting temperature and the temperature and time of acid leaching are greatly lowered; the lowest temperature can reach 50-60 DEG C, and the efficiency of aluminum extraction reaches up to 88%; the SiO2 content in leached slag reaches 95%, and aluminum and silicon separation is achieved; due to agglomeration treatment, a porous structure of a mesoscale is molded for a reaction; the distance between two phases of a solid-liquid ratio is shortened, the mass transfer condition of a gas-liquid two phase is also effectively improved, and therefore extraction of aluminum is reinforced; and fly ash particles and capillary channels in the block sample play a framework role similar with coke in a blast furnace, and the reason that the aluminum oxide extracting rate is high due to an agglomeration means can be explained from the aspect of dynamics.

Description

technical field [0001] The invention belongs to the field of waste recycling, in particular to a method for extracting aluminum. Background technique [0002] China is a country where coal is the main energy source. 76% of electricity is produced by coal. The total stockpile of fly ash produced by coal combustion has exceeded 1 billion tons, and it is still increasing at a rate of 80 million to 100 million tons per year. The largest ash discharge country in the world. The storage of fly ash not only occupies a large amount of land, but also causes serious environmental pollution. Carrying out comprehensive utilization of coal-based solid waste such as fly ash and extending the coal industry chain is not only related to the sustainable development of China's coal industry, power industry and related industries, but also to the protection of land resources, reduction and elimination of pollution, and the realization of circular economy is of great significance. [0003] The...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B7/00C22B21/00
CPCC22B1/02C22B7/007C22B21/0007C22B21/0023Y02P10/20
Inventor 宗燕兵李飞赵成玉万奇林张学栋眭冬宁
Owner UNIV OF SCI & TECH BEIJING
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