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A method for coal gangue double-layer oxygen-enriched sintering and decarbonization

A coal gangue and oxygen-enriched technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of poor activity of coal gangue, high energy consumption, and low treatment efficiency, and achieve improved carbon response Thermal power, accelerated sintering speed, and energy-saving effects

Active Publication Date: 2022-04-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the technical problems of poor activity, high energy consumption, and low processing efficiency of coal gangue in the prior art, the purpose of the present invention is to provide a method for coal gangue double-layer oxygen-enriched sintering decarburization, which aims to , improve the decarbonization efficiency and activity of coal gangue, making the process of the present invention more competitive

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  • A method for coal gangue double-layer oxygen-enriched sintering and decarbonization

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Experimental program
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Effect test

Embodiment 1

[0051] A kind of coal gangue double-layer oxygen-enriched sintering decarburization method of the present invention comprises the following steps:

[0052] (1) Crushing: crushing coal gangue to -6.3mm accounts for 83%, -0.25mm 22%;

[0053] (2) Batching and mixing: coal gangue is mixed with water with a mass ratio of 6.0%, then vigorously mixed for 7 minutes in an intensive mixer, and the rotating speed of the mixer is 880rpm;

[0054] (3) Granulation: in the granulation process, the spraying mass ratio is 2.0% moisture, and the rotating speed of the cylinder granulator is 30rpm, the granulation time is 6min and the filling rate of the cylinder granulator is 13%. pellets, the water content of the raw meal is 7.3%, the particle size of the raw meal is greater than 0.5mm, which is more than 90%, and the particle size of the particle size is greater than 1mm, which is more than 76%;

[0055] (4) Distributing for the first time: Coarse coal gangue is used as the bottom material f...

Embodiment 2

[0062] A kind of coal gangue double-layer oxygen-enriched sintering decarburization method of the present invention comprises the following steps:

[0063] (1) Crushing: crushing coal gangue to -6.3mm accounts for 83%, -0.25mm 22%;

[0064] (2) Batching and mixing: coal gangue is mixed with water with a mass ratio of 6.0%, then vigorously mixed for 7 minutes in an intensive mixer, and the rotating speed of the mixer is 880rpm;

[0065] (3) Granulation: in the granulation process, the spraying mass ratio is 2.0% moisture, and the rotating speed of the cylinder granulator is 30rpm, the granulation time is 6min and the filling rate of the cylinder granulator is 13%. pellets, the water content of the raw meal is 7.3%, the particle size of the raw meal is greater than 0.5mm, which is more than 90%, and the particle size of the particle size is greater than 1mm, which is more than 76%;

[0066] (4) Cloth for the first time: Coarse coal gangue is used as the bottom material for dist...

Embodiment 3

[0073] A kind of coal gangue double-layer oxygen-enriched sintering decarburization method of the present invention comprises the following steps:

[0074] (1) Crushing: crushing coal gangue to -6.3mm accounts for 83%, -0.25mm 22%;

[0075] (2) Batching and mixing: coal gangue is mixed with water with a mass ratio of 6.0%, then vigorously mixed for 7 minutes in an intensive mixer, and the rotating speed of the mixer is 880rpm;

[0076] (3) Granulation: in the granulation process, the spraying mass ratio is 2.0% moisture, and the rotating speed of the cylinder granulator is 30rpm, the granulation time is 6min and the filling rate of the cylinder granulator is 13%. pellets, the water content of the raw meal is 7.3%, the particle size of the raw meal is more than 0.5mm, which is more than 89%, and the particle size is more than 1mm, which is more than 76%;

[0077] (4) Distributing for the first time: Coarse coal gangue is used as the bottom material for distribution, and the th...

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Abstract

The invention discloses a method for coal gangue double-layer oxygen-enriched sintering and decarbonization, which belongs to the technical field of solid waste comprehensive utilization. The invention discloses a method for coal gangue double-layer oxygen-enriched sintering decarbonization, aimed at conventional thick coal gangue During the sintering process of the lower layer, the sintering rate is slow and the utilization coefficient is not high due to the serious over-humidity of the lower layer. The method of double-layer fabric and double-layer sintering is used to suppress the condensation of moisture in the lower part of the material layer, reduce the fault zone, improve air permeability, and accelerate Sintering speed, improve utilization factor. The present invention aims at the problem that during conventional sintering, the sinter layer gradually thickens along the moving direction of the machine tail, the gas permeability of the material layer gradually increases, the air volume distribution is uneven, and the utilization rate of the wind is low, which leads to the problem that the sintering utilization coefficient is not high; the present invention proposes a double-layer With the new sintering method, two combustion layers move downward at the same time on the same section, and the production capacity is doubled, ensuring that the output is increased and the utilization factor is improved while the capacity of the fan remains unchanged.

Description

technical field [0001] The invention belongs to the technical field of solid waste comprehensive utilization, and in particular relates to a double-layer oxygen-enriched sintering decarburization method for coal gangue. Background technique [0002] Coal gangue is solid waste discharged during the coal mining process and coal washing process. It is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process. The main component of coal gangue is Al 2 o 3 , SiO 2 , also contains a small amount of Fe 2 o 3 , CaO, MgO, etc. The output of coal gangue is huge. According to statistics, the annual output of coal gangue in my country is as high as 300 million tons, and the current stockpile is about 4 billion tons. It not only occupies a large amount of land resources, but also seriously endangers environmental safety. There are many technologies for the comprehensive utilization of coal gangue, among which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/04C04B18/12
CPCC04B20/04C04B18/12C04B20/026Y02W30/91
Inventor 朱德庆郭正启潘建李启厚杨聪聪詹若宁王欣
Owner CENT SOUTH UNIV