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A kind of insulating brick prepared by using silica hydrogel as raw material and its preparation method

A technology of silica and hydrogel, which is applied in the field of inorganic materials, can solve problems such as increasing capital investment in tailings waste, soil, water, air pollution, and destruction of the ecological environment, so as to overcome fragility and relieve environmental pressure , the effect of reducing environmental pollution

Active Publication Date: 2021-08-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stockpiling iron tailings not only occupies a large amount of land, but also pollutes soil, water, air, etc., destroys the ecological environment, and has a great impact
[0003] The stockpiling of tailings has a great negative impact on the environment, and tailings ponds need to be built, which not only takes up a lot of land, but also uses a lot of human resources and huge financial resources to
[0004] maintenance, significantly increasing the capital investment for tailings waste

Method used

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  • A kind of insulating brick prepared by using silica hydrogel as raw material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An insulating brick prepared from silica hydrogel, comprising the following components by weight fraction: 100 parts of silica hydrogel, 30 parts of iron tailings, 100 parts of cement, and 15 parts of expanded perlite , 1 part of melamine water reducer, 1 part of rubber powder, 1 part of carboxymethyl cellulose, 10 parts of styrene-acrylic emulsion.

[0035] The preparation method of above-mentioned insulation brick comprises the following steps:

[0036] 1) After mixing and diluting water glass and water at a volume ratio of 1:2, add 4mol / L hydrochloric acid to the mixture to adjust the pH to between 2 and 4, stir for 30 minutes for hydrolysis, and then add 1mol / L ammonia water to adjust the pH to 7~9, let it stand until it is completely solidified to form a gel, the purpose is to form the internal pores of the hydrogel and fully absorb water;

[0037] 2) The gel formed in step 1) is heated and aged at 45°C for 24 hours to fully cure the internal pores to obtain a sil...

Embodiment 2

[0044] An insulating brick prepared from silica hydrogel, comprising the following components by weight fraction: 50 parts of silica hydrogel, 30 parts of iron tailings, 50 parts of cement, and 15 parts of expanded perlite , 1 part of melamine water reducer, 1 part of rubber powder, 1 part of carboxymethyl cellulose, 10 parts of styrene-acrylic emulsion.

[0045] The preparation method of above-mentioned insulation brick comprises the following steps:

[0046] 1) After mixing and diluting water glass and water at a volume ratio of 1:2, add 4mol / L hydrochloric acid to the mixture to adjust the pH to between 2 and 4, stir for 30 minutes for hydrolysis, and then add 1mol / L ammonia water to adjust the pH to 7~9, let it stand until it is completely solidified to form a gel, the purpose is to form the internal pores of the hydrogel and fully absorb water;

[0047] 2) The gel formed in step 1) is heated and aged at 45°C for 24 hours to fully cure the internal pores to obtain a silic...

Embodiment 3

[0054] An insulating brick prepared from silica hydrogel, including the following components by weight fraction: 100 parts of silica hydrogel, 30 parts of iron tailings, 100 parts of cement, and 15 parts of expanded perlite , 1 part of melamine superplasticizer, 1 part of rubber powder, 1 part of carboxymethyl cellulose, and 10 parts of epoxy resin.

[0055] The preparation method of above-mentioned insulation brick comprises the following steps:

[0056] 1) After mixing and diluting water glass and water at a volume ratio of 1:2, add 4mol / L hydrochloric acid to the mixture to adjust the pH to between 2 and 4, stir for 30 minutes for hydrolysis, and then add 1mol / L ammonia water to adjust the pH to 7~9, let it stand until a gel is formed;

[0057] 2) The gel formed in step 1) was heated and aged at 45°C for 24 hours to obtain a silica hydrogel product;

[0058] 3) Grinding and pulverizing the iron tailings and passing through a 120-mesh sieve to obtain iron tailings powder w...

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Abstract

The invention discloses a thermal insulation brick prepared by using silica hydrogel as a raw material and a preparation method thereof. The thermal insulation brick comprises the following components in parts by weight: 25 to 150 parts of silica hydrogel, iron tailings 15-60 parts, 25-150 parts of cement, 5-40 parts of expanded perlite, 0.1-5 parts of additive, 1-20 parts of resin; the solid waste such as iron tailings can be processed in large quantities by the method of the present invention, and the preparation The conditions are simple, the raw materials are easy to obtain, and it is easy to industrialize, and the prepared insulation bricks have a wide range of applications. In the preparation method of the thermal insulation brick of the present invention, cement is used as the skeleton, iron tailings replace part of the cement as the skeleton, the water reducer increases the fluidity of the concrete, and the rubber powder, carboxymethyl cellulose and resin increase the amount between the components. Viscosity, and finally reduce the amount of water through silica hydration to reduce the water absorption of expanded perlite. Through the synergistic effect of silica hydrogel and expanded perlite, the thermal insulation and light properties of the final insulation brick product are maintained.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a thermal insulation brick prepared by using silica hydrogel as a raw material and a preparation method thereof. Background technique [0002] The total scale of my country's mineral resources development ranks among the top in the world. The outstanding characteristics of my country's iron ore resources are low grade and many symbiotic and associated ores, which lead to a large amount of iron tailings in the process of beneficiation, and 2.5-3.0 t tailings. Stockpiling iron tailings not only occupies a large amount of land, but also pollutes soil, water, air, etc., destroys the ecological environment, and has a great impact. [0003] The stockpiling of tailings has a great negative impact on the environment, and tailings ponds need to be built, which not only takes up a lot of land, but also uses a lot of human resources and huge financial resources to [0004] ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/26C04B38/00C04B38/08C04B111/40
Inventor 王建国杨骏邓声威宋鑫孔祥宇
Owner ZHEJIANG UNIV OF TECH