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Comprehensive utilization method for coal ash solid waste

A technology for solid waste and coal burning ash, applied in the direction of alkaline earth metal silicate, silicate, iron halide, etc., can solve the problem of low value, achieve good water purification effect, good adsorption and cation exchange capacity, Effects of high economic and environmental value

Inactive Publication Date: 2013-12-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the utilization of traditional coal ash is mainly auxiliary materials such as construction concrete or road construction, which is a low-end utilization with little value.

Method used

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  • Comprehensive utilization method for coal ash solid waste
  • Comprehensive utilization method for coal ash solid waste
  • Comprehensive utilization method for coal ash solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Acid leaching of coal ash:

[0036] 1.1) Put the coal-fired ash in the crucible, then calcinate it in an electric furnace at 750°C for 2 hours, take it out and cool it to room temperature naturally in the air to obtain the calcined ash; put the calcined ash into a ball mill tank for dry ball milling 24h, pass through a 180-mesh sieve after ball milling to remove coarse particles and obtain finely ground ash;

[0037] 1.2) Put the finely ground ash into a small beaker, add hydrochloric acid with a mass concentration of 20% into the finely ground ash according to the liquid-solid ratio of 4mL:1g, and then heat in a constant temperature water bath at 90°C Stir for 2 hours for acid extraction to obtain an acid extraction solution containing solid particles;

[0038] 1.3) Centrifugally filter the acid extraction liquid containing solid particles to separate the solid and liquid, and obtain the aluminum chloride iron clear liquid and the solid residue respectively; wash the...

Embodiment 2

[0049] 1) Acid leaching of coal ash:

[0050] 1.1) Put the coal-fired ash in the crucible, then calcinate it in an electric furnace at 750°C for 2 hours, take it out and cool it to room temperature naturally in the air to get the calcined ash; put the calcined ash into a ball mill tank and dry process Ball mill for 24 hours, pass through a 180-mesh sieve after ball milling, remove coarse particles, and obtain finely ground ash;

[0051] 1.2) Put the finely ground ash into a small beaker, add hydrochloric acid with a mass concentration of 30% into the finely ground ash according to the liquid-solid ratio of 3mL:1g, and then heat in a constant temperature water bath at 85°C Stir for 1.5h for acid extraction to obtain an acid extraction solution containing solid particles;

[0052] 1.3) Centrifugally filter the acid extraction solution containing solid particles to separate the solid and liquid, and obtain the aluminum chloride ferric clear liquid and the solid residue; wash the...

Embodiment 3

[0061] 1) Acid leaching of coal ash:

[0062] 1.1) Put the coal-fired ash in a crucible, then calcinate it in an electric furnace at 750°C for 2 hours, take it out and cool it to room temperature naturally in the air to get the calcined ash, put the calcined ash into a ball mill tank for dry ball milling After 24 hours, pass through a 180-mesh sieve after ball milling to remove coarse particles and obtain finely ground ash;

[0063] 1.2) Put the finely ground ash into a small beaker, add hydrochloric acid with a mass concentration of 25% to the finely ground ash according to the liquid-solid ratio of 4.5mL:1g, and then keep the temperature in a constant temperature water bath at 95°C Heat and stir for 2.5 hours to perform acid extraction to obtain an acid extraction solution containing solid particles;

[0064] 1.3) Centrifugally filter the acid extraction liquid containing solid particles to separate the solid and liquid, and obtain the aluminum ferric chloride solution and ...

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Abstract

A comprehensive utilization method for coal ash solid waste comprises the following steps: grinding and sieving coal ash after being calcined, and soaking in a hydrochloric acid of 20-30% mass concentration to respectively obtain ferro-aluminium chlorination liquor and solid residue; adding Ca(OH)2 and Al(OH)3 in the ferro-aluminium chlorination liquor, and adjusting the basicity to 45-55%, controlling the pH value at 3.5-5.0 through the hydrochloric acid, performing water thermal polymerization at the temperature of 105-110 DEG C, and obtaining a poly ferro-aluminium chlorination liquor after concentration and drying; washing and drying the solid residue, adding Ca(OH)2 at the molar ratio of n(Ca)to n(Si) of 5:6, adding NaOH at the molar ratio of n[Ca(OH)2] to n(NaOH) of 1:(0.5-1.5), and performing thermal reaction at the temperature of 180-220 DEG C to obtain a tobermorite sewage disposal material. According to the method, a comprehensive solution that aluminium oxide and a small amount of ferric oxide and calcium oxide in the coal ash are adopted to prepare poly ferro-aluminium chlorination purifying agent, and the components of silicon dioxide are adopted to prepare the tobermorite sewage disposal material is offered, so that the purpose that the coal ash is comprehensively used to prepare the environment material with higher added value is achieved.

Description

technical field [0001] The invention belongs to the field of ecological environment materials, and in particular relates to a comprehensive utilization method of coal burning ash solid waste. Background technique [0002] Solid waste treatment has always been an important problem that plagues the sustainable development of global industry and the environment. Recycling waste resources is undoubtedly a promising direction, which can not only generate high economic value, but also has great environmental protection significance. Coal burning ash is a common solid waste produced by thermal power plants and coal-fired boilers, and it is one of the largest sources of environmental pollution in today's society. Therefore, the recycling of coal ash with higher added value is an urgent need of the national environmental protection industry today. [0003] Coal combustion ash is a general term for the volatile ash of coal combustion (fly ash) and the residue of coal combustion (resi...

Claims

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Application Information

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IPC IPC(8): C01B33/113C01G49/10C01B33/24
Inventor 张超武缪金良徐彬时春辉王芬王亚杰
Owner SHAANXI UNIV OF SCI & TECH
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