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Coal gangue fuel-free self-heating type ultrahigh material bed decarburization process

A coal gangue and fuel-free technology, which is applied in the field of coal gangue fuel-free self-heating ultra-high material layer decarbonization process, can solve the problems of high energy consumption, low processing efficiency, and poor activity of coal gangue, and achieve energy saving, Promotes decarbonization reaction and is beneficial to decarbonization reaction

Active Publication Date: 2021-10-22
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the technical problems of coal gangue with poor activity effect, high energy consumption and low treatment efficiency in the prior art, the purpose of the present invention is to provide a coal gangue fuel-free self-heating ultra-high material layer decarbonization process, aiming at The ultra-high material layer sintering method provided by the invention reduces the energy consumption and cost of processing, improves the decarbonization efficiency and activity of coal gangue, and makes the process more competitive

Method used

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  • Coal gangue fuel-free self-heating type ultrahigh material bed decarburization process

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Mix the coal gangue powder crushed to -6.3mm with water with a mass ratio of 6.0%, and then vigorously mix it in an intensive mixer for 6 minutes. The speed of the mixer is 850rpm, and the mixed ore belt is transported to the cylinder for granulation In the granulation machine, during the granulation process, the water with a mass ratio of 2.0% was sprayed, and the rotating speed of the cylinder granulator was 30rpm, and the granulation time was 5min. Air permeability resistance 43mmH 2 O.

[0039] Coal gangue raw materials are distributed by rollers in the belt sintering machine (the height of the material layer is 1000mm), and then ignited, ventilated and sintered, cooled, and 15-20mm of gangue is used as the bottom material. The thickness of the bottom material is 15mm. The temperature is 1050°C, the ignition negative pressure is 5KPa, the holding temperature is 850°C, the holding time is 4 minutes, the sintering negative pressure is 12KPa; the cooling time is 6 min...

Embodiment 2

[0043] Mix the coal gangue powder crushed to -6.3mm with water with a mass ratio of 6.5%, and then vigorously mix it in an intensive mixer for 7 minutes. The speed of the mixer is 900rpm. In the granulation machine, during the granulation process, the water with a mass ratio of 1.5% was sprayed, and the rotating speed of the cylinder granulator was 35rpm, and the granulation time was 6min. The resulting pellets had a water content of 7.3% and the raw meal Air permeability resistance 40mmH 2 O.

[0044] Coal gangue raw materials are distributed by rollers in the belt sintering machine (the height of the material layer is 1500mm), and then ignited, ventilated and sintered, cooled, and 15-20mm of gangue is used as the bottom material. The thickness of the bottom material is 18mm. Temperature 1050°C, ignition negative pressure 5KPa, holding temperature 850°C, holding time 4min, sintering negative pressure 15KPa; cooling time 6min, cooling negative pressure 8KPa, the coal gangue s...

Embodiment 3

[0048] Mix the coal gangue powder crushed to -6.3mm with water with a mass ratio of 6.5%, and then vigorously mix it in an intensive mixer for 7 minutes. The speed of the mixer is 900rpm. In the granulation machine, during the granulation process, the water with a mass ratio of 1.5% was sprayed, and the rotating speed of the cylinder granulator was 35rpm, and the granulation time was 6min. The resulting pellets had a water content of 7.3% and the raw meal Air permeability resistance 44mmH 2 O.

[0049] Coal gangue raw materials are distributed by rollers in the belt sintering machine (the height of the material layer is 1750mm), and then ignited, ventilated and sintered, cooled, and 15-20mm of gangue is used as the bottom material. The thickness of the bottom material is 20mm. Temperature 1050°C, ignition negative pressure 5KPa, holding temperature 850°C, holding time 5min, sintering negative pressure 15KPa; cooling time 7min, cooling negative pressure 9KPa, the coal gangue s...

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Abstract

The invention discloses a coal gangue fuel-free self-heating type ultrahigh material bed decarburization process, which utilizes the automatic heat storage effect in the sintering process of an ultrahigh material bed (1000-2000mm), the temperature of a sintering material bed is increased along with the increase of the height of the material bed, and the heat is increased, so that the temperature of a combustion zone is favorably increased, the decarburization reaction of coal gangue is promoted, the mineralization reaction of minerals such as silicon, aluminum and the like in the coal gangue is accelerated, a large amount of heat is converted into chemical energy to be stored in minerals, and the product activity is improved. By utilizing the automatic heat storage principle of an ultrahigh material bed and combining fixed carbon contained in the coal gangue, the sintering of the coal gangue can be realized under the condition of not additionally adding fuel, so that the energy is saved, the energy consumption is reduced, the environmental protection is facilitated, and the cost is reduced; and meanwhile, the decarburization reaction is facilitated due to low solid fuel ratio and higher oxygen level of the material bed, and a high-quality active mixed material product can be obtained.

Description

technical field [0001] The invention belongs to the technical field of solid waste comprehensive utilization, and relates to a coal gangue fuel-free self-heating ultra-high material layer decarbonization process. Background technique [0002] Coal gangue is a black-gray rock with lower carbon content and higher hardness than coal associated with coal during the coal-forming process. Its calorific value is generally lower than 6.3MJ / kg, and it contains Al 2 o 3 , SiO 2 and Fe 2 o 3 Such as inorganic ash, the total content reaches 60% to 95% of the total amount of coal gangue, and it becomes a kind of industrial solid waste because it is difficult to utilize. Generally, 0.15-0.2 tons of coal gangue will be produced for every 1 ton of raw coal produced. It is estimated that the annual discharge of coal gangue will exceed 700 million tons by 2020. Due to the difficulty of comprehensive utilization of coal gangue, although my country’s coal gangue utilization technology has...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/38C04B20/04C04B20/02C04B18/12
CPCC04B7/24C04B7/38C04B20/04C04B20/026C04B18/12Y02W30/91Y02P40/10
Inventor 郭正启潘建朱德庆李启厚杨聪聪
Owner CENT SOUTH UNIV
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