Technology for preparing coal-gangue lightweight aggregate with pelletizing method through belt-type roasting machine

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 effect of improving strength, uniform quality and increasing yield

Active Publication Date: 2019-08-09
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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  • Technology for preparing coal-gangue lightweight aggregate with pelletizing method through belt-type roasting machine

Examples

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 technology for preparing coal-gangue lightweight aggregate with a pelletizing method through a belt-type roasting machine. The technology includes the following steps of 1) breaking and ore grinding; 2) preparing and even mixing; 3) pelletizing and screening; 4) roasting in the belt-type roasting machine; 5) finished-product grading. The coal-gangue-lightweight-aggregatepelletizing-method preparing technology of the belt-type roasting machine is suitable for large-scale production of high-quality coal-gangue lightweight aggregate, and the obtained product is high instrength, even in mass, low in energy consumption and environmentally friendly; a huge amount of coal gangue may be thoroughly eliminated, the environment problem caused by the coal gangue is solved,and the high-performance lightweight aggregate is produced and provides a high-quality raw material for construction industry; a specific additive is prepared in the technology, the functions of improving the strength of green balls and increasing the yield and the effects of a fluxing agent and a foaming agent are both achieved, the formation temperature of a liquid phase of a system is lowered,swelling of coal-gangue pellets is promoted, the organizational structure of the lightweight aggregate is optimized accordingly, the strength of the lightweight aggregate is remarkably improved, and energy consumption is reduced.

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 Applications(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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