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Method for extracting aluminum oxide from coal ash on basis of lime sinter process

A lime sintering and fly ash technology, which is applied in the direction of alumina/aluminum hydroxide, alkaline earth metal silicate, silicate, etc., can solve the problems of high energy consumption and high cost, and achieve low sintering energy consumption, high temperature and The effect of large output and suitable for large-scale industrial production

Inactive Publication Date: 2016-07-13
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the sintering method mainly includes limestone sintering method and soda lime sintering method, and their common limitations are high energy consumption and high cost.

Method used

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  • Method for extracting aluminum oxide from coal ash on basis of lime sinter process
  • Method for extracting aluminum oxide from coal ash on basis of lime sinter process
  • Method for extracting aluminum oxide from coal ash on basis of lime sinter process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Grinding and mixing: Add 80Kg of fly ash and 146Kg of lime into the mixer (ball mill) for grinding and mixing, and the mixture is ground to 200 mesh;

[0029] ⑵Raw meal ball making: use the mixed material prepared in the ⑴ step and the dilute solution of slaked lime (binder) (mass concentration is 5%-6%), use high-frequency vibrating pressure agglomeration to make balls, and dry them at low temperature High-aluminum fly ash sintered pellets; the obtained high-alumina fly ash sintered pellets have a particle size of 4-8mm and a moisture content of less than 6%;

[0030] (3) Shaft furnace roasting: the high-aluminum fly ash sintered pellets are evenly distributed in the shaft furnace, and after five stages of drying, preheating, roasting, soaking, and cooling, the raw meal balls are roasted into mature pellets; the roasting temperature 1300°C-1450°C, baking time 40 minutes;

[0031] ⑷ Self-powdering cooling: first cool the clinker to 500-550°C in the self-powdering c...

Embodiment 2

[0038] (1) Grinding and mixing: Add 60Kg of fly ash and 110Kg of lime into the mixer (ball mill) for grinding and mixing, and the mixture is ground to 200 mesh;

[0039] ⑵Raw meal ball making: use the mixed material prepared in the ⑴ step and the dilute solution of slaked lime (binder) (mass concentration is 5%-6%), use high-frequency vibrating pressure agglomeration to make balls, and dry them at low temperature High-aluminum fly ash sintered pellets; the obtained high-alumina fly ash sintered pellets have a particle size of 4-8mm and a moisture content of less than 6%;

[0040] (3) Shaft furnace roasting: the high-aluminum fly ash sintered pellets are evenly distributed in the shaft furnace, and after five stages of drying, preheating, roasting, soaking, and cooling, the raw meal balls are roasted into mature pellets; the roasting temperature 1300°C-1450°C, baking time 40 minutes;

[0041] ⑷ Self-powdering cooling: first cool the clinker to 500-550°C in the self-powdering c...

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Abstract

The invention discloses a method for extracting aluminum oxide from coal ash on basis of a lime sinter process.The method includes steps: (1) grinding and mixing; (2) raw material balling; (3) shaft furnace calcining; (4) autogenous pulverizing and cooling; (5) dissolving out; (6) separating and washing; (7) carbonizing and decomposing; (8) filtering; (9) treating according to a low-temperature Bayer process, so that metallurgical aluminum oxide is obtained.The method has the advantages that by shaft furnace calcinations, energy consumption is greatly reduced, and production cost is evidently reduced; by the method, sintering under high-temperature large-scale operating conditions can be realized easily, product sintering quality is guaranteed, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of resource utilization of fly ash, relates to the effective utilization of fly ash, in particular to a method for extracting alumina from fly ash based on a lime sintering method. Background technique [0002] At present, for large-scale electrolytic aluminum enterprises without alumina self-sufficiency, with the high risks of foreign alumina export policies and the impact of domestic alumina resources being exhausted, there are risks in the long-term supply of alumina raw materials. [0003] At the same time, the domestic high-alumina coal prospective resources are about 100 billion tons, which is rich in alumina 10 billion tons. In view of electrolytic aluminum, steel and other enterprises need to consume a large amount of steam coal, especially electrolytic aluminum, iron and steel joint ventures. Therefore, for such enterprises, adopt the circular economy industry development idea of ​​high-alumina coal power ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01B33/24
CPCC01F7/02C01B33/24
Inventor 吴建文何成善寇建国张军张有余
Owner JIUQUAN IRON & STEEL GRP
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