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A method for preparing ceramsite by sintering barren coal gangue industrial waste residue as raw material

A technology for industrial waste residue and coal gangue, applied in the field of building materials, can solve the problems of low plasticity index, difficult utilization, high silicon content, and achieve the effects of low production cost, protection of arable land, and low thermal conductivity.

Active Publication Date: 2015-11-04
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Barren coal gangue accounts for more than 60% of the total coal gangue, which has high silicon content and low plasticity index, making it difficult to utilize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Mix barren gangue and phyllite in a weight ratio of barren gangue: phyllite = 2.5:1, stir evenly, and crush to a particle size of less than 1mm to form a mixture A;

[0018] (2) Add water glass to the mixture A in an amount of 10% of the total weight of the mixture A to form the mixture B; add water to the mixture B and stir evenly, the amount of water added is 12% of the weight of the mixture B, Then place it under closed conditions for 48 hours to obtain the aged material;

[0019] (3) Turn the aged materials into raw meal balls with a diameter of 5~15mm, put the raw meal balls into a drying oven, dry them at 106°C for 3 hours, put them in an electric furnace after drying, and first keep them warm at 120°C 25min, then at 600 ° C for 15min to prepare barren gangue ceramsite.

[0020] After testing, the prepared barren gangue sintered ceramsite cylinder has a compressive strength of 5.1MPa and a bulk density of 535kg / m 3 , Water absorption rate 8.6%.

Embodiment 2

[0022] (1) Mix barren gangue and phyllite in a weight ratio of barren gangue: phyllite = 2:1, stir evenly, and crush to a particle size of less than 1 mm to form a mixture A;

[0023] (2) Add water glass to the mixture A in an amount of 8% of the total weight of the mixture A to form the mixture B; add water to the mixture B and stir evenly, the amount of water added is 14% of the weight of the mixture B, Then place it under closed conditions for 48 hours to obtain the aged material;

[0024] (3) Make aged materials into raw meal balls with a diameter of 5~15mm, put the raw meal balls into a drying oven, dry them at 106°C for 5 hours, put them in an electric furnace after drying, and first keep them warm at 300°C 20min, then at 1000°C for 12min to prepare barren gangue ceramsite.

[0025] After testing, the prepared barren gangue sintered ceramsite cylinder has a compressive strength of 5.6MPa and a bulk density of 568kg / m 3 , Water absorption 7.5%.

Embodiment 3

[0027] (1) Mix barren gangue and phyllite in a weight ratio of barren gangue: phyllite = 1:1, stir evenly, and crush to a particle size of less than 1 mm to form a mixture A;

[0028] (2) Add water glass to the mixture A in an amount of 5% of the total weight of the mixture A to form the mixture B; add water to the mixture B and stir evenly, the amount of water added is 16% of the weight of the mixture B, Then place it under closed conditions for 48 hours to obtain the aged material;

[0029] (3) Make aged materials into raw meal balls with a diameter of 5~15mm, put the raw meal balls into a drying oven, dry them at 106°C for 6 hours, put them in an electric furnace after drying, and first keep them warm at 600°C 15min, then in 1250 DEG C of insulation 10min, make barren gangue ceramsite.

[0030] After testing, the prepared barren gangue sintered ceramsite cylinder has a compressive strength of 5.0MPa and a bulk density of 598kg / m 3 , The water absorption rate is 7.2%.

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Abstract

The invention belongs to the field of building materials, and specifically relates to a method of preparing ceramsite by sintering industrial waste residue of barren coal gangue as raw materials. The technical scheme provided by the invention is as follows: the method comprises the following steps: forming a mixed material by barren coal gangue and phyllite; adding water glass and water; placing for 48 hours under a sealed condition to obtain an aged material; preparing the aged material to raw material balls with diameter of 5-15mm; placing the raw material balls in a drying box, and drying for 3-6 hours at 106 DEG C; placing in an electric furnace after drying; firstly, insulating for 15-25 minutes at 120-600 DEG C; then, insulating for 10-15 minutes at 600-1250 DEG C to prepare the barren coal gangue ceramsite. The barren coal gangue ceramsite prepared by the method provided by the invention is light in weight, high in strength, low in heat conductivity coefficient and low in water absorption rate, and the performance of the ceramsite meets the standard of ceramsite for buildings, thereby not only fully recycling heat energy resources in coal gangue, but also effectively improving the additional value of coal gangue products. The method is a novel coal gangue comprehensive utilization method which has good popularization and application values.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing ceramsite by sintering barren coal gangue industrial waste residues as raw materials. Background technique [0002] China is a big coal country, and the coal gangue produced every year exceeds 200 million tons. Coal gangue piles up like a mountain, occupies a lot of land and seriously affects the environment. It is imperative to use it as a large resource. Infertile coal gangue accounts for more than 60% of the total coal gangue, which is difficult to utilize due to its high silicon content and low plasticity index. With the acceleration of China's urbanization process, high-rise buildings are becoming more and more widespread. If we can find a substitute for traditional pebbles to prepare concrete, it will play a role in energy conservation and environmental protection, and will also greatly expand the new way of utilizing coal gangue as a lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00
Inventor 孙晓刚巩恩普邢军邱景平冯慎明刘剑平王雁冰李小庆刘骎梁健
Owner NORTHEASTERN UNIV LIAONING
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