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A process for preparing active mixed materials by belt sintering of coal gangue

A technology of active mixed materials and coal gangue, which is applied in the field of active mixed materials prepared by coal gangue belt sintering, can solve the problems of low output and poor activity of coal gangue, and achieve the effects of high temperature, improved sintering permeability and enhanced activity

Active Publication Date: 2020-02-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the technical problems of poor activity effect and low output of coal gangue in the prior art, the object of the present invention is to provide a process for preparing active mixed materials by belt sintering of coal gangue, aiming at The method can efficiently, low-cost, clean and large-scale use coal gangue to prepare mixed materials with good performance.

Method used

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  • A process for preparing active mixed materials by belt sintering of coal gangue
  • A process for preparing active mixed materials by belt sintering of coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Coal gangue powder crushed to -8mm, mixed with semi-coke with a mass ratio of 4%, quicklime with a mass ratio of 2% and water with a mass ratio of 5%, and then vigorously mixed in a cylinder mixer for 3 minutes, mixed The ore leveling belt is transported to the cylinder granulator. During the granulation process, water with a mass ratio of 1.5% is sprayed, and the rotation speed of the cylinder granulator is 40rpm, and the granulation time is 3min. The pellets obtained from granulation have a particle size of The mass ratio of +3mm is 72%, the water content is 7.5%, and the gas permeability resistance of the raw meal is 43Pa.

[0041] Coal gangue raw materials are distributed through the rollers in the belt sintering machine (the height of the material layer is 700mm), and then ignited, ventilated, sintered, and cooled. The ignition time is 2.5 minutes, the ignition temperature is 1100 ° C, the ignition negative pressure is 6KPa; the sintering negative pressure is 12KPa;...

Embodiment 2

[0045] Coal gangue powder crushed to -8mm, mixed with semi-coke with a mass ratio of 5%, quicklime with a mass ratio of 2.5% and water with a mass ratio of 5.5%, and then vigorously mixed in a cylinder mixer for 3 minutes; The ore leveling belt is transported to the cylinder granulator. During the granulation process, water with a mass ratio of 1.5% is sprayed, and the rotation speed of the cylinder granulator is 40rpm, and the granulation time is 3min; the pellets obtained from granulation have a particle size of The mass ratio of +3mm is 75%, the water content is about 7%, and the air permeability resistance of raw meal is 40Pa.

[0046] Coal gangue raw materials are distributed through the rollers in the belt sintering machine (the height of the material layer is 700mm), and then ignited, ventilated and sintered, and cooled; at the ignition time of 2.5min, the ignition temperature is 1150°C, and the ignition negative pressure is 6KPa; the sintering negative pressure is 14KPa...

Embodiment 3

[0050] Coal gangue powder crushed to -8mm, mixed with semi-coke with a mass ratio of 4%, quicklime with a mass ratio of 2.5% and water with a mass ratio of 5.0%, and then vigorously mixed in a cylinder mixer for 3 minutes; The ore leveling belt is transported to the cylinder granulator. During the granulation process, water with a mass ratio of 1.5% is sprayed, and the rotation speed of the cylinder granulator is 40rpm, and the granulation time is 5min; the pellets obtained from granulation have a particle size of The mass ratio of +3mm is 71%, the water content is about 7%, and the gas permeability resistance of raw meal is 44Pa.

[0051] Coal gangue raw materials are distributed through the rollers in the belt sintering machine (the height of the material layer is 700mm), and then ignited, ventilated and sintered, and cooled; at the ignition time of 2.5min, the ignition temperature is 1150°C, and the ignition negative pressure is 6KPa; the sintering negative pressure is 14KPa...

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Abstract

The invention discloses a process for preparing an activated mixed material through strand sintering of coal gangue. The process comprises the following steps: (1) crushing; (2) preparing materials, and uniformly mixing, namely sufficiently and uniformly mixing crushed coal gangue, quick lime, a carbon fuel and water in a cylinder mixing machine in a set ratio; (3) pelletizing, namely pelletizingthe uniformly mixed minerals into beads of a preset granularity; (4) sintering, namely performing allocation, ignition, air sucking sintering and cooling on the pelletized beads in a strand air sucking sintering machine; (5) crushing and finely grinding, namely crushing the sintered material, and finely grinding till a set specific surface area, thereby obtaining the activated mixed material. Theinvention provides the process for preparing an activated mixed material through strand sintering of coal gangue, by virtue of the properties that a combustion zone is high in temperature and short intime in the sintering process, a vitric phase can be formed, meanwhile, the sintered material mainly contains an oxidation atmosphere, harmful components such as organic matters, residual carbon andsulfur in the coal gangue can be removed at a high temperature, and the cementing property, the freezing resistance and the durability of cement are protected from adverse influence of the harmful components.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and in particular relates to a process for preparing active mixed materials by belt-type sintering of coal gangue. Background technique [0002] Coal gangue is a solid waste produced during the coal mining process and coal washing process. It is a kind of rock with low carbon content and hard particle size associated with coal seams. According to incomplete statistics, the stockpile of coal gangue in my country is as high as 10 billion tons, covering an area of ​​more than 20,000 mu. Therefore, coal gangue has become the industrial waste with the largest stockpile and annual production in my country, occupying the most storage space, and causing great harm to the environment. [0003] At present, there are many methods for the comprehensive utilization of coal gangue, such as coal gangue power generation, coal gangue sintered bricks, cement raw materials, paving ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06
CPCC04B40/0046C04B22/0006C04B22/064
Inventor 潘建郭正启朱德庆李启厚李紫云梁钟仁
Owner CENT SOUTH UNIV
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