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Direct combustion activation process for coal gangue, and geopolymer preparation process

A preparation process, coal gangue technology, applied in the direction of cement production, etc., can solve the problems of low performance of building materials, insignificant social benefits, limited application scenarios, etc., and achieve the goal of improving related performance, improving safety production conditions, and improving reactivity Effect

Inactive Publication Date: 2021-10-08
北京荣露材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When making building materials, because there are still some carbon and carbon compounds in the gangue, the performance of the prepared building materials is not high, the application scenarios are limited, the consumption is low, and the social benefits are not significant

Method used

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  • Direct combustion activation process for coal gangue, and geopolymer preparation process
  • Direct combustion activation process for coal gangue, and geopolymer preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one: a kind of coal gangue direct combustion activation process comprises the following steps,

[0031]Step 1, raw material preparation and preliminary treatment, collecting coal gangue with a carbon content of 15%. The collected coal gangue is crushed into particles with a crusher, and the particle size of the crushed coal gangue is less than 15mm;

[0032] Step 2, mid-term treatment, the coal gangue particles from step 1 are sent to the direct-fired heat treatment equipment. The direct-fired heat treatment equipment is equipped with a combustion chamber, a hood at the bottom, and micropores in the hood. The high-pressure air is introduced from the hood, and the high-pressure air is ejected from the micropores of the hood, blowing up the coal gangue particles and turning them over continuously. And feed fuel combustion, the fuel is coke oven gas. A high-temperature regenerator is formed in the combustion chamber, and the temperature in the high-temperature...

Embodiment 2

[0038] Embodiment 2: a coal gangue direct combustion activation process, the difference from embodiment 1 is that the carbon content of the coal gangue in step 1 is 8%. In step 2, the fuel is natural gas, the temperature in the high-temperature heat storage tank is maintained in the range of 800-950°C, the treatment time is 5 hours, and the temperature is 725°C when discharging. In step 4, the specific surface area of ​​coal gangue powder obtained by vertical grinding is 500m 2 / kg.

Embodiment 3

[0039] Embodiment 3: The difference from Embodiment 2 is that the fuel is coke oven gas, the temperature in the high-temperature heat storage tank is maintained at 800±50°C for 6 hours, and the final discharge temperature is 705°C. In step 4, the specific surface area after secondary grinding is 520m 2 / kg.

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Abstract

The invention relates to the technical field of coal gangue application, and discloses a direct combustion activation process for coal gangue, and a geopolymer preparation process. The direct combustion activation process for coal gangue comprises the following steps: 1, raw material preparation and pretreatment: crushing the coal gangue into coal gangue particles; 2, middle-stage treatment: subjecting the coal gangue particles and fuel to mixing and combustion, and introducing high-pressure air to blow up the coal gangue particles; 3, cooling treatment: rapidly cooling a coal gangue material treated in the step 2; and 4, secondary grinding: grinding the coal gangue material obtained in the step 3. The invention has the beneficial effects that the coal gangue is activated through a specific process and then is used for preparing a geopolymer, and the geopolymer is applied to building materials, high-strength materials, solid core and solid waste materials, sealing materials and high-temperature-resistant materials. Through a technical route and principles different from technical routes and principles in the prior art, the coal gangue is utilized to the maximum extent, a large amount of coal gangue is consumed, and remarkable economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of coal gangue application, in particular to a coal gangue direct combustion activation process and a geopolymer preparation process. Background technique [0002] Coal gangue is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process. It is a hoop waste discharged during the coal mining process and coal washing process. The main chemical composition of coal gangue is SiO 2 The content is about 40%-55%, Al 2 o 3 The content is about 15%-40%, Fe 2 o 3 The content is about 2%-10%, and the CaO content is about 1%-10%. In addition, it also contains a small amount of MgO, K 2 O, Na 2 For O and rare elements, the general loss on ignition is 10%-20%. [0003] At present, the comprehensive utilization of coal gangue in my country mainly includes coal gangue power generation, manufacturing building materials, recycling useful minerals,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/00C04B7/24
CPCC04B12/005C04B7/24Y02P40/10
Inventor 金小刚窦顺珍苏磊
Owner 北京荣露材料科技有限公司
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