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Porous ceramic prepared from red mud and coal ash and preparation method thereof

A technology of porous ceramics and fly ash, which is applied in the field of porous ceramics, can solve problems such as land occupation and environmental pollution, and achieve the effects of reducing land occupation, simple preparation process and being beneficial to environmental protection.

Active Publication Date: 2013-09-18
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its massive stacking not only encroach on the land but also pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take 60% red mud by weight, 15% fly ash, 20% coal powder, and 5% borax and mix evenly, add 15% moisture of the above composition weight and continue to mix evenly. Press molding on tablet press, molding pressure is 12MPa. Put the molded body into an oven and dry it at 100°C for 5 hours. The dried green body is put into a roasting furnace for roasting, and the sintering temperature is 1080°C. With furnace cooling, red mud fly ash porous ceramic products are made. The roasting procedure is as follows:

[0040] 30-450℃ 105min

[0041] 450℃ for 60min

[0042] 450-600℃ 75min

[0043] 600-1080℃ 95min

[0044] 1080°C heat preservation for 40min

[0045] The obtained porous ceramic sample was tested to have an apparent porosity of 47.43% and a flexural strength of 14.45MPa.

Embodiment 2

[0047] Take 45% red mud by weight, 35% fly ash, 15% pulverized coal, and 5% borax and mix evenly, add 15% moisture of the above composition weight and continue to mix evenly. Press molding on tablet press, molding pressure is 12MPa. Put the molded body into an oven and dry it at 100°C for 5 hours. The dried green body is put into a roasting furnace for roasting, and the sintering temperature is 1080°C. With furnace cooling, the finished product of fly ash red mud porous ceramics is made. The roasting procedure is as follows:

[0048] 30-450℃ 105min

[0049] 450℃ for 60min

[0050] 450-600℃ 75min

[0051] 600-1080℃ 95min

[0052] 1080°C heat preservation for 40min

[0053] The obtained porous ceramic sample was tested to have an apparent porosity of 51.12% and a flexural strength of 12.45MPa.

Embodiment 3

[0055] Take 70% red mud by weight, 8% fly ash, 20% coal powder, and 2% borax and mix evenly, add 15% moisture of the above composition weight and continue to mix evenly. Press molding on tablet press, molding pressure is 12MPa. Put the molded body into an oven and dry it at 100°C for 5 hours. The dried green body is put into a roasting furnace for roasting, and the sintering temperature is 1000°C. With furnace cooling, the finished product of fly ash red mud porous ceramics is made. The roasting procedure is as follows.

[0056] 30-450℃ 105min

[0057] 450℃ for 60min

[0058] 450-600℃ 75min

[0059] 600-1000℃ 90min

[0060] 1000℃ for 40 minutes

[0061] The obtained porous ceramic sample was tested to have an apparent porosity of 49.46% and a flexural strength of 13.58MPa.

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PUM

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Abstract

The invention belongs to the technical field of porous ceramics, and in particular relates to a porous ceramic prepared from red mud and coal ash, and a preparation method of the porous ceramic. The porous ceramic comprises the following components in percentage by weight: 40-70% of red mud, 5-40% of coal ash, 10-30% of a pore-forming agent, 1-5% of an additive, and water which is 10-20% of the total weight of the materials, and the red mud, the coal ash, the pore-forming agent, the additive and the water are uniformly mixed according to a ratio, and further formed, dried and roasted so as to prepare the porous ceramic material. The porous ceramic is prepared by utilizing the red mud and the coal ash in a composite manner, and the process is simple and the cost is low, but also a great deal of industrial waste can be consumed, and the environmental-friendliness is facilitated. Therefore, a porous ceramic material with high porosity, high bending resistance and opened pore structure can be prepared by using the method.

Description

technical field [0001] The invention belongs to the technical field of porous ceramics, and in particular relates to a porous ceramic prepared by using red mud and fly ash and a preparation method thereof. Background technique [0002] Red mud is industrial solid waste discharged from the process of producing alumina from bauxite. For every ton of alumina produced, about 0.8-1.5 tons of red mud are produced. At present, the comprehensive utilization rate of red mud in my country is only 4%, and the cumulative stockpiles have reached 200 million tons. With the annual increase of alumina production in my country and the gradual decrease of bauxite grade, the annual production of red mud will continue to increase. It is estimated that by 2015, the cumulative stockpiling of red mud will reach 350 million tons. A large amount of red mud is piled up, which not only occupies land, wastes resources, but also easily causes environmental pollution and potential safety hazards. The c...

Claims

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Application Information

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IPC IPC(8): C04B38/00
Inventor 刘立强吴庆波张全鹏
Owner SHANDONG JIANZHU UNIV
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