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Method for activating coal gangue and/or coal ash by using red mud

A technology for fly ash and coal gangue, which is applied in the field of comprehensive utilization of aluminum-containing waste residues, can solve problems such as large consumption of additives, and achieve the effects of efficient activation, reduced consumption, and efficient resource utilization.

Active Publication Date: 2015-07-01
SHANXI UNIV
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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 solve the problem of large consumption of additives in the coal gangue and / or fly ash activation process, and to provide a method of adding an appropriate amount of red mud and sodium carbonate to the coal gangue and / or fly ash to increase the amount of coal gangue and coal ash. / or fly ash active method, develop efficient co-processing technology of red mud and coal gangue and / or fly ash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Take 100g of coal gangue with an alumina content of 22.9% and a silica content of 41.1%, add 175g of red mud with an alumina content of 23.4%, a silica content of 19.1%, and a sodium oxide content of 9.4% and 38g Sodium carbonate, fully mixed, calcined at 850°C for 3 hours, cooled to obtain sintered clinker;

[0019] 2) Acid leaching of aluminum: Add 1252mL of 18% hydrochloric acid to the sintered clinker, raise the temperature to 100°C for 2 hours, dissolve the reactant, filter to remove the residue, and obtain AlCl 3 aluminum salt solution.

[0020] The aluminum in the solution was detected by EDTA complexation-copper salt back titration method, and the dissolution rate of aluminum oxide was 91.2%.

Embodiment 2

[0022] 1) Take 100g of coal-fired fly ash with an alumina content of 35.3%, a silica content of 50.9%, and add 110g of red mud with an alumina content of 23.4%, a silica content of 19.1%, and a sodium oxide content of 9.4% and 52g of sodium carbonate, fully mixed, calcined at 800°C for 2 hours, and cooled to obtain sintered clinker;

[0023] 2) Acid leaching of aluminum: Add 1000mL of 20% hydrochloric acid to the sintered clinker, raise the temperature to 105°C for 2 hours, dissolve the reactant, remove the residue by filtration, and obtain AlCl 3 aluminum salt solution.

[0024] The aluminum in the solution was detected by EDTA complexation-copper salt back titration method, and the dissolution rate of aluminum oxide was 93.7%.

Embodiment 3

[0026] 1) Take 100g of boiler slag with an alumina content of 32.7% and a silica content of 45.3%, add 80g of red mud with an alumina content of 23.4%, a silica content of 19.1%, and a sodium oxide content of 9.4% and 35g Sodium carbonate, fully mixed, calcined at 900°C for 2 hours, cooled to obtain sintered clinker;

[0027] 2) Acid leaching of aluminum: Add 1010mL of 20% hydrochloric acid to the sintered clinker, raise the temperature to 100°C for 2 hours, dissolve the reactant, remove the residue by filtration, and obtain AlCl 3 aluminum salt solution.

[0028] The aluminum in the solution was detected by EDTA complexation-copper salt back titration method, and the dissolution rate of aluminum oxide was 90.2%.

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Abstract

The invention discloses a method for activating coal gangue and / or coal ash by using red mud. The method comprises the following steps: mixing coal gangue and / or coal ash with a certain amount of red mud and Na2CO3; sintering at 600-1000 DEG C to obtain sintered clinker with high reactivity; reacting the sintered clinker and a hydrochloric acid solution with the mass concentration of 15-25% at 80-120 DEG C to extract alumina, wherein in the mixture, the dissolution rate of the alumina can be more than 90%. By the method, the consumption of activating additive alkali can be reduced, co-processing of the red mud and the coal gangue and / or coal ash can be achieved, and a foundation for following use of the coal gangue and / or coal ash is laid.

Description

technical field [0001] The invention relates to the comprehensive utilization of aluminum-containing waste residue, in particular to a method for activating coal gangue and / or fly ash by using red mud from an alumina plant. Background technique [0002] Coal gangue and / or fly ash are rich in alumina and silica, and alumina and silica are extracted from coal gangue and / or fly ash to prepare high value-added aluminum and silicon products as coal gangue and / or powder An important direction for the high-value utilization of coal ash. A typical process for extracting alumina and silica from coal gangue and / or fly ash is an acid-base combined method, that is, using hydrochloric acid or sulfuric acid to first dissolve the alumina in coal gangue and / or fly ash to form a water-soluble Aluminum salt solution, the remaining residue is mainly silica, which is further transformed and utilized. However, because coal gangue is mainly composed of kaolinite, the crystal phase of the struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01B33/12B09B3/00
Inventor 程芳琴郭彦霞崔莉杨喜李瑶瑶
Owner SHANXI UNIV
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