Method of preparing light thermal insulation material by employing bauxite tailings

A technology of thermal insulation and bauxite, which is applied in the field of preparing lightweight thermal insulation materials from bauxite tailings, can solve the problems of insufficient activity of bauxite tailings, low silica content, high alumina content, etc. Achieve far-reaching environmental protection significance and social benefits, high strength, good thermal insulation performance

Inactive Publication Date: 2017-06-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to aim at the deficiencies in the above-mentioned prior art, and to provide a light-weight thermal insulation material prepared from bauxite tailings that can effectively overcome the problems of insufficient activity of bauxite tailings, high alumina content, and low silicon oxide content. method of insulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Reconstituted bauxite tailings 46%, fly ash 34%, lime 16%, desulfurization gypsum 4%, blowing agent 0.12%, water 65%. Mix and stir the ingredients evenly, add hot water at 60ºC, add foaming agent and stir evenly, put it into a mold that has been preheated at 40ºC, rest for 1.5 hours, and then maintain it at 1.1MPa for 8 hours at constant pressure.

[0034] Performance test: the compressive strength of lightweight thermal insulation material is 4.1 MPa, the density is 606 Kg / m3, and the thermal conductivity is 0.0950W / (m·K)

Embodiment 2

[0036] Reconstituted bauxite tailings 31%, fly ash 41%, lime 14.4%, desulfurization gypsum 3.6%, cement 10%, water reducing agent 1%, air entraining agent 0.12%, stabilizer 0.05%, water 63%. Mix and stir the ingredients evenly, then add hot water at 55ºC, then add foaming agent and stir evenly, then put it into a mold that has been preheated at 50ºC, rest for 1.5 hours, and then maintain it at 1.1MPa for 8 hours at constant pressure.

[0037] Performance test: the compressive strength of lightweight thermal insulation material is 3.6 MPa, the density is 624 Kg / m3, and the thermal conductivity is 0.0639W / (m·K)

Embodiment 3

[0039] Reconstituted bauxite tailings 33%, fly ash 43%, lime 15.2%, desulfurization gypsum 3.8%, cement 5%, water reducing agent 0.5%, air entraining agent 0.04%, stabilizer 0.02%, water 63%. Mix and stir the ingredients evenly, add hot water at 70ºC, add foaming agent and stir evenly, put it into a mold that has been preheated at 60ºC, rest for 1 hour, and then maintain it at 1.6MPa for 6 hours at constant pressure.

[0040] Performance test: the compressive strength of lightweight thermal insulation material is 5.5 MPa, the density is 725 Kg / m3, and the thermal conductivity is 0.0918W / (m·K)

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Abstract

The invention discloses a method of preparing a light thermal insulation material by employing bauxite tailings and relates to a comprehensive utilization method of bauxite tailings. The method is characterized by comprising the following steps of: adding the bauxite tailings into kaolin to calcined and reconstructed; and preparing the light thermal insulation material by taking the mixture as a raw material of the light thermal insulation material. The method disclosed by the invention makes full use of industrial solid wastes such as bauxite tailings, coal ash and flue gas desulfurization gypsum, and the material is low in cost, high in strength and good in thermal insulation property, and meanwhile, the requirement on SiO2 content is relatively low. The solid waste bauxite tailings can be scientifically utilized to realize reclamation of wastes, so that the method has far-reaching environmental-friendly meaning.

Description

technical field [0001] The invention discloses a method for preparing light-weight thermal insulation materials by using bauxite tailings, and relates to a comprehensive utilization method of bauxite tailings. Background technique [0002] The "Annual Report on China's Comprehensive Utilization of Resources (2014)" issued by the National Development and Reform Commission shows that in 2013, my country's tailings production was 1.649 billion tons, and the comprehensive utilization rate was only 18.9%. Reached 14.6 billion tons. The stockpiling of tailings not only occupies land, but also pollutes the environment, and may cause major safety accidents. [0003] Bauxite tailings is one of many types of metal tailings. It has the common characteristics of metal tailings, fine particle size, high moisture content, large volume, weak and sticky shape. It is an inert material, but it is different from other tailings. The difference is that its alumina content is high and silica con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B38/02C04B111/40
CPCC04B28/00C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B18/12C04B18/08C04B22/064C04B22/145C04B38/02C04B2103/302C04B2103/304C04B2103/0068
Inventor 马小娥魏红姗李世华赵越董云涛
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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