Baking-free brick using coal gangue and red mud as main materials, and preparation method for baking-free brick

A technology of coal gangue and unburned bricks, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of high compressive strength, achieve the effects of improving strength, reducing production costs, and reducing accumulation

Active Publication Date: 2014-10-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a kind of raw material that uses red mud and coal gangue as the main raw materials. Alleviate the environmental pollution problems caused by the storage and disposal of red mud and coal gangue, realize the resource utilization of red mud and coal gangue, greatly reduce energy consumption, and the prepared unburned bricks have good compactness, no looseness, and average compression resistance high strength

Method used

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  • Baking-free brick using coal gangue and red mud as main materials, and preparation method for baking-free brick
  • Baking-free brick using coal gangue and red mud as main materials, and preparation method for baking-free brick
  • Baking-free brick using coal gangue and red mud as main materials, and preparation method for baking-free brick

Examples

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Embodiment 1

[0048] A method for producing burn-free bricks with coal gangue and red mud as main raw materials, comprising the following steps:

[0049] 1. Dry the red mud and coal gangue at 105°C for 3 hours respectively. After natural cooling, crush the dried red mud and pass through a 80-mesh sieve to obtain red mud powder. Grind the dried coal gangue and pass through a 100-mesh sieve. Mesh sieve to get gangue powder.

[0050] 2. The fly ash is first dried at 105°C for 3 hours, cooled naturally, and then crushed into a powder with a 100-mesh sieve with a residue of less than 5%.

[0051] 3. Weigh 25g of red mud powder, 20g of coal gangue powder, and 8g of fly ash. Stir and mix the above raw materials evenly for initial mixing. The mixing time for the initial mixing is 3 minutes, then add 8g of water, and then perform secondary mixing after stirring. The mixing time of the secondary mixing was 5 minutes to obtain a mixture. The added water can be tap water, recovered reclaimed water or...

Embodiment 2

[0057] A method for producing burn-free bricks with coal gangue and red mud as main raw materials, comprising the following steps:

[0058] 1. Dry the red mud and coal gangue at 100°C for 3 hours respectively. After natural cooling, crush the dried red mud and pass through a 80-mesh sieve to obtain red mud powder. Grind the dried coal gangue and pass through a 100-mesh sieve. Mesh sieve to get gangue powder.

[0059] 2. The fly ash is first dried at 100°C for 3 hours, cooled naturally, and then crushed into a powder with a 100-mesh sieve with a residue of less than 5%.

[0060] 3. Weigh 35g of red mud powder, 30g of coal gangue powder, and 10g of fly ash. Stir and mix the above raw materials evenly for initial mixing. The mixing time for the initial mixing is 5 minutes, then add 10g of water, and then perform secondary mixing by stirring. The mixing time of the secondary mixing was 3 minutes to obtain a mixture. The added water can be tap water, recovered reclaimed water or ...

Embodiment 3

[0065] A method for producing burn-free bricks with coal gangue and red mud as main raw materials, comprising the following steps:

[0066] 1. Dry the red mud and coal gangue at 105°C for 3 hours respectively. After natural cooling, crush the dried red mud and pass through a 80-mesh sieve to obtain red mud powder. Grind the dried coal gangue and pass through a 100-mesh sieve. Mesh sieve to get gangue powder.

[0067] 2. The fly ash is first dried at 105°C for 3 hours, cooled naturally, and then crushed into a powder with a 100-mesh sieve with a residue of less than 5%.

[0068] 3. Weigh 15g of red mud powder, 10g of coal gangue powder, and 4g of fly ash. Stir and mix the above raw materials evenly for initial mixing. The mixing time for the initial mixing is 5 minutes, then add 8g of water, and then carry out secondary mixing by stirring. The mixing time of the secondary mixing was 4 minutes to obtain a mixture. The added water can be tap water, recovered reclaimed water or ...

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Abstract

The invention relates to a baking-free brick using coal gangue and red mud as main materials, and a preparation method for the baking-free brick. The preparation method comprises the following steps: selecting red mud, coal gangue and fly ash as raw materials, adding water to make a green body, and then steaming and nourishing in water vapor of which the temperature is 60-140 DEG C and the pressure is 0.12-0.35 MPa for 2-10 h. Through steaming and nourishing at the specific pressure and the specific temperature, the structure of the prepared baking-free brick is relatively compact, the average compressive strength is further improved, the dose of an exciting agent is reduced, the strength of the brick is improved, the plasticity of the green body and the compressive strength of the product are improved, the baking-free brick not only satisfies the usability of the product, but also completely achieves the requirements of national standard, no cementing material is needed to be added in the production process, no firing is needed, accumulation of red mud and coal gangue is reduced in a larger sense, and the problem of red mud and coal gangue discharge on environment is solved.

Description

technical field [0001] The invention relates to an unfired brick with coal gangue and red mud as main materials and a preparation method thereof, belonging to the technical field of comprehensive utilization of industrial solid waste resources and new building materials. Background technique [0002] Red mud is the waste residue produced during the production of alumina. It is red because it contains a large amount of iron oxide, so it is called red mud. The output of red mud varies with ore grade, production method and technical level. Most production plants produce 1.0-1.8 tons of red mud for every 1 ton of alumina produced. It is estimated that the red mud produced by the alumina industry in the world exceeds 6×10 7 t. The amount of red mud produced in my country's alumina production process exceeds 6 million tons every year, all of which are stored in the open air, and most of the dams of the storage yard are constructed with red mud. At present, people are paying mo...

Claims

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Application Information

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IPC IPC(8): C04B28/08C04B18/12
CPCY02W30/91
Inventor 岳钦艳姜婷婷魏媛媛郑皓月李文凯岳东亭
Owner SHANDONG UNIV
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