Method for preparing active mixed material through belt type roasting machine pelletizing method

A technology of belt-type roaster and active mixed materials, which is applied in applications, household utensils, clay products, etc., can solve the problems of poor activity and low output of coal gangue, and achieve improved roasting decarburization, improved quality and activity, and improved quality effect

Active Publication Date: 2019-07-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the technical problems of poor coal gangue activity and low output in the prior art, the purpose of the present invention is to provide a method for preparing active mixed materials u

Method used

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  • Method for preparing active mixed material through belt type roasting machine pelletizing method

Examples

Experimental program
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Effect test

Embodiment 1

[0072] After the coal gangue is crushed to -1mm, dry grinding to -0.074mm 80%, the obtained finely ground coal gangue is rolled through high-pressure roller milling, the rolling pressure is 400KN / m, and the rolling moisture is controlled at 7.5%, improving Specific surface area up to 1650cm 2 / g, and then add compound additives (40% sodium humate, 40% quicklime, 10% magnetite, 10% hematite) with a mass ratio of 2%, and mix in an intensive mixer for 1.5min (1600~ 2000rpm), and then pelletized in a disc pelletizer to prepare green pellets with a particle size of 8-15mm and a water content of 8.5%. The drop strength of the green pellets is 5.5 times / 0.5m, and the compressive strength of the pellets is 11.4N / piece, the bursting temperature of green balls is 450°C.

[0073] The green balls are dried at 400°C for 4 minutes on a belt roaster (the height of the green ball layer is 150mm), preheated at 800°C for 12 minutes, and then oxidized and roasted at 1150°C for 20 minutes, and...

Embodiment 2

[0077] After the coal gangue is crushed to -1mm, dry grinding to -0.074mm 80%, the obtained finely ground coal gangue is rolled through high-pressure roller milling, the rolling pressure is 400KN / m, and the rolling moisture is controlled at 7.5%, improving Specific surface area up to 1650cm 2 / g, then add compound additives (40% sodium humate, 40% quicklime, 10% magnetite, 10% hematite) with a mass ratio of 4%, and mix in an intensive mixer for 1.5min (1600~ 2000rpm), and then pelletized in a disc pelletizer to prepare green pellets with a particle size of 8-15mm and a water content of 8.5%. The drop strength of the green pellets is 6.5 times / 0.5m, and the compressive strength of the pellets is 13.2N / piece, the bursting temperature of green balls is 480°C.

[0078] Green balls are dried at 400°C for 4 minutes on a belt roaster (the height of the green ball layer is 150mm), preheated at 800°C for 12 minutes, and then oxidized and roasted at 1200°C for 20 minutes, and the oxi...

Embodiment 3

[0083] After the coal gangue is crushed to -1mm, dry grinding to -0.074mm 80%, the obtained finely ground coal gangue is rolled by high-pressure roller mill, the rolling pressure is 500KN / m, and the rolling moisture is controlled at 7.5%. Specific surface area up to 1600cm 2 / g, then add compound additives with a mass ratio of 5% (30% sodium humate, 50% quicklime, 10% magnetite, 10% hematite), and mix in an intensive mixer for 1min (1600~2000rpm ), and then pelletized in a disc pelletizer to prepare green pellets with a particle size of 8-15mm and a water content of 8.5%. 1, the bursting temperature of green balls is 520°C.

[0084] The green balls are dried at 450°C for 4 minutes on a belt roaster (the height of the green ball layer is 150mm), preheated at 800°C for 12 minutes, and then oxidized and roasted at 1200°C for 20 minutes, and the oxidized roasted product is placed at 1050°C for 5 minutes, and the product is completed. During the soaking process, it is quickly tra...

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Abstract

The invention discloses a method for preparing an active mixed material through a belt type roasting machine pelletizing method. The method comprises the following steps: (1) crushing and grinding ore; (2) burdening and uniformly mixing: fully and uniformly mixing the coal gangue subjected to fine grinding, a composite additive and water in an intensive mixer according to predetermined proportion,and fully wetting the materials; (3) pelletization: preparing pellets with preset granularity from the uniformly mixed ores; (4) roasting by a belt type roasting machine: distributing the pellets onthe belt type roasting machine, and drying, preheating, oxidizing and roasting, soaking and cooling the pellets; and (5) crushing and fine grinding: crushing and fine grinding the coal gangue pellet material to a set specific surface area to obtain the active mixed material. The invention provides a method for preparing the active mixed material through the belt type roasting machine pelletizing method. The method is suitable for large-scale production, the usage amount of the coal gangue reaches 85% or above, the coal gangue stockpiling problem can be thoroughly solved, and a high-quality mixed material is provided for the construction industry.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and in particular relates to a method for preparing an active mixed material by adopting a belt roaster pellet method. 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. Usually, the output of coal gangue is 15% to 20% of the output of raw coal. In 2017, the output of raw coal in my country was 3.445 billion tons. Based on this calculation, the output of coal gangue is more than 500 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. Therefore, coal gangue has become the industrial waste with the largest stockpile and annual production in my country, occupying the most storage space,...

Claims

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Application Information

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IPC IPC(8): C04B33/132C04B33/13
CPCC04B33/1305C04B33/131C04B33/132C04B2235/3208C04B2235/3272C04B2235/6567Y02P40/60
Inventor 郭正启潘建朱德庆李启厚梁钟仁李紫云
Owner CENT SOUTH UNIV
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