A method for preparing low thermal conductivity thermal insulation material from high-calcium gasification ash slag

A technology of low thermal conductivity and thermal insulation materials, applied in chemical instruments and methods, other chemical processes, cement production, etc., can solve the problems of poor thermal insulation performance, low utilization rate of ash, and preparation of thermal insulation materials, etc. Achieve the effects of easy operation, environmental protection and simple preparation process

Active Publication Date: 2020-12-25
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Looking at these methods, the amount of ash is generally not more than 50%, so that the utilization rate of ash is not high, and many components need to be added in addition to the ash in the formula, which not only makes the formula complicated, the cost increases, but also the insulation of the product. The thermal insulation performance is not very good, such as the thermal conductivity of foam concrete and air-entrained concrete are between 0.082-0.186W / (m K) and 0.093-0.164W / (m K) respectively
Gasification ash is the residue left after the coal is completely gasified in the gasifier. It is the remaining material after the combustibles in the coal are partially gasified. The product generated by the reaction, there is currently no relevant report on the preparation of insulation materials using gasification ash as the main raw material

Method used

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  • A method for preparing low thermal conductivity thermal insulation material from high-calcium gasification ash slag
  • A method for preparing low thermal conductivity thermal insulation material from high-calcium gasification ash slag

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Grind the fluidized bed gasification ash 1 to a particle size of 300 mesh, calcine at 600°C for 3 hours, and then quench it, take 2M acetic acid, and mix the acetic acid solution with the calcined gasification ash according to the ratio of acetic acid solution:reaction raw material = 150ml:10g The residue was reacted at 90°C for 18 minutes, the filter residue was washed until neutral, dried in an oven, and ground to a particle size of 300 mesh to obtain a low thermal conductivity insulation material.

Embodiment 2

[0025] Grind the fluidized bed gasification ash 1 to a particle size of 300 mesh, calcine at 660°C for 2.5 hours, and then quench it, take 4M acetic acid, and mix the acetic acid solution with the calcined gasification After ultrasonication for 1 minute, the ash residue was reacted at 80°C for 120 minutes. The filter residue was washed until neutral, dried in an oven, and ground to a particle size of 300 mesh to obtain a low thermal conductivity insulation material.

Embodiment 3

[0027] Grind the fluidized bed gasification ash 1 to a particle size of 100 mesh, calcine at 700°C for 2 hours, and then quench it, take 6M acetic acid, and mix the acetic acid solution with the calcined gasification ash according to the ratio of acetic acid solution:reaction raw material = 110ml:10g The residue was ultrasonicated for 3 minutes and then reacted at 70°C for 90 minutes. The filter residue was washed until neutral, dried in an oven, and ground to a particle size of 100 mesh to obtain a low thermal conductivity insulation material.

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Abstract

A method for preparing a low-conductivity-coefficient heat preservation material by using high-calcium gasified ash comprises the steps that high-calcium gasified ash is burned at the temperature of 600-800 DEG C for 1-3 hours after being smashed, the decarbonized ash is obtained after quenching is conducted, the decarbonized ash serves as a reaction raw material, a acetic acid with the molar concentration being 2-9 M is taken to be mixed with the reaction raw material at the ratio of the acetic acid to the reaction raw material being 60-150 ml:10g, and the reaction is conducted at the temperature of 50-90 DEG C for 30-180 minutes; the ash subjected to acetic acid treatment is filtered, the filter residue is washed to be neutral, then dried, smashed, and sieved, and the low-conductivity-coefficient heat preservation material is obtained. The method has the characteristics of being low in the conductivity coefficient and simple to prepare.

Description

technical field [0001] The invention relates to a method for preparing high-calcium gasification ash slag to prepare a low thermal conductivity thermal insulation material, and belongs to the technical field of solid waste utilization and thermal insulation material technology. Background technique [0002] Promoting the comprehensive utilization of chemical waste residues is an inevitable trend to improve economic development and strengthen environmental protection. Ash slag is a huge amount of chemical waste. At present, most of it is used for cement production (48.5%), reclamation of low-lying areas (12.73%), road paving (11.65%), mine filling (8.26%) and brick making (6.30%) %), causing soil and groundwater pollution, destroying the ecological cycle, causing environmental pollution and waste of resources. Using ash slag to prepare thermal insulation materials is a way to use fly ash with high value and reduce environmental pollution. There are many related literatures ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/30C04B7/24C09K3/18
CPCC04B7/24C04B7/30C09K3/185Y02P40/10
Inventor 黄戒介杜梅杰刘哲语房倚天王志青
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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