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Method for preparing crystalline aluminum chloride and white carbon black from fly ash or coal gangue

A technology for crystallizing aluminum chloride and coal gangue, applied in chemical instruments and methods, aluminum chloride, aluminum halide, etc., can solve the problems of secondary pollution, complex technical process, high energy and material consumption, and achieve no three-waste discharge and process. Simple, cost-effective results

Active Publication Date: 2021-05-14
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation of crystalline aluminum chloride from fly ash or coal gangue mainly extracts alumina from fly ash or coal gangue through methods such as soda lime sintering method, limestone sintering method, acid dissolution method, and ammonium sulfate sintering method, and then further The preparation of alumina into crystalline aluminum chloride has problems such as complex technical process, high energy consumption and material consumption, and large amount of waste liquid and residue, which makes the production cost high and produces secondary pollution.

Method used

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  • Method for preparing crystalline aluminum chloride and white carbon black from fly ash or coal gangue
  • Method for preparing crystalline aluminum chloride and white carbon black from fly ash or coal gangue
  • Method for preparing crystalline aluminum chloride and white carbon black from fly ash or coal gangue

Examples

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Effect test

Embodiment 1

[0032] Take 100g of fly ash, add 54g of potassium carbonate, mix thoroughly, calcinate at 850°C for 3 hours, and cool to obtain sintered clinker; add 520mL of 40% sulfuric acid to the sintered clinker, heat up to 120°C for 2 hours, and dissolve the reactant , after the reaction is completed, heat filter to obtain silicon-containing tailings; naturally cool the filtrate to obtain crude aluminum salt, dissolve the crude aluminum salt in hot water at 80°C, keep stirring for 3 hours, then cool to below 20°C, stand still, and filter to obtain Refined aluminum salt, refined aluminum salt is dissolved with 10% ammonia water, separated by sedimentation and washed to obtain aluminum hydroxide, aluminum hydroxide is then dissolved with 20% hydrochloric acid, evaporated and concentrated at 60°C, separated by sedimentation, saturated aluminum chloride After the solution is washed, crystalline aluminum chloride is obtained; the silicon-containing tailings are dissolved with 20% NaOH solutio...

Embodiment 2

[0034] Take 100g of fly ash, add 63g of potassium carbonate, mix thoroughly, calcinate at 900°C for 3 hours, and cool to obtain sintered clinker; add 550mL of 50% sulfuric acid to the sintered clinker, heat up to 130°C for 3 hours, and dissolve the reactant , after the reaction is completed, heat filter to obtain silicon-containing tailings; naturally cool the filtrate to obtain crude aluminum salt, dissolve the crude aluminum salt in hot water at 90°C, keep stirring for 1 hour, then cool to below 20°C, stand and filter to obtain Refined aluminum salt, refined aluminum salt is eluted with 8% dilute ammonia water, separated by sedimentation, washed to obtain aluminum hydroxide, aluminum hydroxide is then dissolved with 25% hydrochloric acid, concentrated by evaporation at 80°C, separated by sedimentation, saturated aluminum chloride After the solution is washed, crystalline aluminum chloride is obtained; the silicon-containing tailings are dissolved with 20% NaOH solution at 100...

Embodiment 3

[0036] Take 100g of coal gangue, add 70g of potassium carbonate, mix thoroughly, calcinate at 920°C for 3 hours, and cool to obtain sintered clinker; add 620mL of 60% sulfuric acid to the sintered clinker, heat up to 100°C for 2 hours, and dissolve the reactant. After the reaction is completed, heat filter to obtain silicon-containing tailings; naturally cool the filtrate to obtain crude aluminum salt, dissolve the crude aluminum salt in hot water at 70°C, keep stirring for 2 hours, then cool to below 20°C, stand still, and filter to obtain refined Aluminum salt, refined aluminum salt is eluted with 15% ammonia water, separated by sedimentation and washed to obtain aluminum hydroxide, which is then dissolved with 23% hydrochloric acid, concentrated by evaporation at 90°C, separated by sedimentation, and washed with saturated aluminum chloride solution Finally, crystalline aluminum chloride is obtained; the silicon-containing tailings are dissolved with 20% NaOH solution at 100°...

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Abstract

The invention discloses a method for preparing crystalline aluminum chloride and white carbon black from fly ash or coal gangue, comprising the following steps: 1) mixing fly ash, coal gangue and K 2 CO 3 Mix evenly in proportion, so that the molar ratio of potassium and aluminum in the ingredients is 0.5:1~2:1; 2) Calcinate the mixture prepared in step 1) at 700~1000°C, and cool to obtain sintered clinker; 3) Mix the sintered clinker prepared in step 2) with sulfuric acid with a mass concentration of 10-70% according to the mass ratio of 1:1-1:20, react at 80-150°C, and filter while hot to obtain the filtrate and silicon-containing tail slag; silicon-containing tailings can be used to produce sodium silicate and white carbon black through processes such as alkali dissolution and carbon separation; 4) the filtrate is used to prepare crystalline aluminum chloride; 5) the filter residue is used for the preparation of white carbon black. The method has the advantages of simple technological process, low energy and material consumption, high utilization rate of alumina in fly ash and live coal gangue, recyclable tail liquid, and tailing slag can be used to produce white carbon black.

Description

technical field [0001] The invention relates to comprehensive utilization of fly ash and coal gangue, in particular to a method for preparing crystalline aluminum chloride and white carbon black from fly ash or coal gangue. Background technique [0002] Fly ash and coal gangue are bulk solid wastes generated during coal combustion and gasification and coal mining respectively. In recent years, the total output has reached about 1.3 billion tons. Since the utilization rate is only 70%, nearly 400 million tons are still stockpiled every year. , resulting in a large amount of environmental pollution. Fly ash or coal gangue is rich in alumina, and the use of alumina in it to prepare alumina, crystalline aluminum chloride, and aluminum-based flocculants has become an important direction for its high-value utilization. [0003] Crystalline aluminum chloride is a widely used chemical product, which can be used in the production of polyaluminum chloride flocculants for wastewater t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/56C01B33/12C01D7/00C01B33/32C05G1/00
CPCC01B33/12C01B33/32C01D7/00C01F7/56C05G1/00
Inventor 郭彦霞赵泽森程芳琴高建明薛芳斌
Owner SHANXI UNIV
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