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A process for preparing coal gangue lightweight aggregate by belt roaster pellet method

A technology of belt roasting machine and lightweight aggregate, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., to achieve the effects of uniform quality, optimized organizational structure, and improved yield

Active Publication Date: 2021-06-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the belt roaster is widely used in the production of iron ore pellets (a single production line can produce 8 million tons of pellets per year), but there is no report on the production of coal gangue light aggregates.

Method used

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  • A process for preparing coal gangue lightweight aggregate by belt roaster pellet method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] After the coal gangue is crushed to -1mm with a jaw crusher, it is ground to -0.074mm by a dry ball mill, accounting for 85%, and the finely ground coal gangue is rolled through a high-pressure roller mill, wherein the rolling pressure is 500KN / m , the rolling moisture is controlled at 6.5%, so that the specific surface area of ​​coal gangue powder can be increased to 1450cm 2 / g.

[0036] Coal gangue powder (accounting for 96% by mass) is mixed with 3% multifunctional additives (sodium humate 30%, magnetite 20%, limestone 50%), and the mass ratio is 3% water. Mix in the mixer for 1.5min (speed 1600-2000rpm), and then pelletize in the disc pelletizer for 12min (a small amount of water needs to be added during the pelletizing process and sieved), and the water content of the obtained green pellets is 8.5 %, the particle size is 8-16mm, the drop strength of green balls is 4.2 times / 0.5m, the compressive strength of green balls is 10.3N / piece, and the bursting temperature...

Embodiment 2

[0040] After the coal gangue is crushed to -1mm with a jaw crusher, it is dry-grinded to -0.074mm, accounting for 85%. Control at 7.5%, increase the specific surface area to 1550cm 2 / g.

[0041] Coal gangue powder (accounting for 91% in mass ratio) is mixed with 5% multifunctional additives (sodium humate 40%, magnetite 20%, limestone 40%) in mass ratio, and 4% water in mass ratio. Mix in an intensive mixer for 2 minutes (rotation speed: 1600-2000rpm), and then pelletize in a disc pelletizer for 12 minutes (add a small amount of water and sieve during the pelletizing process), and finally obtain a particle size of 8-16mm , raw balls with a moisture content of 8.0%. The drop strength of green balls is 5.2 times / 0.5m, the compressive strength of green balls is 11.2N / piece, and the bursting temperature of green balls is 380°C.

[0042] Green balls are dried at 350°C for 4 minutes on a belt roaster (the height of the green ball layer is 250mm), preheated at 800°C for 15 minute...

Embodiment 3

[0045] After the coal gangue is crushed to -1mm with a jaw crusher, it is dry-grinded to -0.074mm, accounting for 85%. Control at 8.0%, increase the specific surface area to 1570cm 2 / g.

[0046] Then in coal gangue powder (mass ratio accounts for 93%), adding mass ratio is 3% multifunctional additive (sodium humate 45%, magnetite 15%, limestone 40%), and mass ratio is 4% water, in Mix in a strong mixer for 2 minutes (rotation speed: 1600-2000rpm), and then pelletize in a disc pelletizer for 11 minutes (a small amount of water needs to be added during the pelletizing process, and sieved), and the particle size is 8-16mm , raw balls with 8.5% water content. The drop strength of green balls is 5.9 times / 0.5m, the compressive strength of green balls is 13.2N / piece, and the bursting temperature of green balls is 440°C.

[0047] The green balls are dried at 400°C for 3.5 minutes on a belt roaster (the height of the green ball layer is 250mm), preheated at 850°C for 16 minutes, t...

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Abstract

The invention discloses a process for preparing coal gangue light aggregate by a belt roasting machine pellet method, which comprises the following steps: 1) crushing and grinding; 2) batching and mixing; 3) pelletizing and screening; 4) Roasting in a belt roaster; 5) Grading of finished products. The process for preparing coal gangue lightweight aggregate by the belt roaster pellet method provided by the present invention is suitable for large-scale production of high-quality coal gangue lightweight aggregate, and the obtained product has high strength, uniform quality and low energy consumption , environmentally friendly; it is expected to completely eliminate huge amounts of coal gangue, solve the environmental problems it brings, and produce high-performance lightweight aggregates to provide high-quality raw materials for the construction industry; specific additives are formulated in the process of the invention, which can improve production Ball strength, improve the function of yield, and have the effect of flux and foaming agent, reduce the liquid phase formation temperature of the system and promote the expansion of coal gangue pellets, so as to optimize the structure of lightweight aggregate, significantly improve its strength and reduce energy consumption .

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 coal gangue light aggregate by a belt roaster pellet method. Background technique [0002] Coal gangue production accounts for 15 to 20% of coal production. my country is the world's largest coal producer and consumer, as well as the world's largest coal gangue producer. In 2017, my country's 3.445 billion tons, based on this calculation, the output of coal gangue is as high as 650 million tons. 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. A large amount of coal gangue is directly stored, which not only occupies a large amount of land, but also has a huge impact on soil, water resources, ecological environment and human health. Therefore, the comprehensive utilization of coal gangue is particularly impor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/02C04B18/12
CPCC04B18/027C04B18/023C04B18/12C04B14/308C04B14/28C04B24/24Y02W30/91
Inventor 潘建朱德庆郭正启李启厚李紫云梁钟仁
Owner CENT SOUTH UNIV
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