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A kind of preparation method of rice husk fireproof board

A technology of fireproof board and rice husk, which is applied in the direction of manufacturing tools, flat products, reed/straw treatment, etc., can solve the problems of low fire resistance and easy deformation, and achieve the effects of cheap production cost, low density and controllable process.

Active Publication Date: 2022-02-22
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low fireproof performance and easy deformation in the preparation process of rice husk boards, the present invention proposes a method for preparing rice husk fireproof boards. The prepared rice husk fireproof boards have light weight, high strength, good thermal stability, The fire-resistant performance reaches Class A, high strength, good ductility, energy saving and environmental protection, etc.

Method used

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  • A kind of preparation method of rice husk fireproof board
  • A kind of preparation method of rice husk fireproof board
  • A kind of preparation method of rice husk fireproof board

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) rice husks are pulverized;

[0034] The waste rice husk after grain processing is dried and crushed through an 80-mesh sieve to obtain rice husk powder.

[0035] (2) Soak the pulverized rice husk powder at room temperature in concentrated sulfuric acid with a mass concentration of 98% for 12 minutes; then soak it in a malic acid solution with a mass concentration of 10% and heat and stir until 60° C., keep it warm for 30 minutes, and then Rinse three times with deionized water, and then air-dry the rice husk powder to obtain the treated rice husk powder.

[0036] (3) Add urea and thiourea to the rice husk powder treated in step (2), then add a mixed alkali solution of sodium hydroxide and calcium oxide, heat to 90° C., and react for 2 hours to obtain alkaline treated rice shell powder.

[0037] Among them, the amount of thiourea added is 6.5% of the mass of rice husk powder after treatment, the amount of urea added is 8.0% of the mass of rice husk powder after tre...

Embodiment 2

[0043] (1) rice husks are pulverized;

[0044] The waste rice husk after grain processing is dried and crushed through a 100-mesh sieve to obtain rice husk powder.

[0045] (2) Soak the pulverized rice husk powder at normal temperature in concentrated sulfuric acid with a mass concentration of 98% for 15 minutes; then soak it in a malic acid solution with a mass concentration of 10% and heat and stir until 50° C., keep it warm for 40 minutes, and then Rinse three times with deionized water, and then air-dry the rice husk powder to obtain the treated rice husk powder.

[0046] (3) Add urea and thiourea to the rice husk powder treated in step (2), then add a mixed alkali solution of sodium hydroxide and calcium oxide, heat to 100° C., and react for 1 hour to obtain alkaline-treated rice shell powder.

[0047] Among them, the amount of thiourea added is 5% of the mass of rice husk powder after treatment, the amount of urea added is 10% of the mass of rice husk powder after treatm...

Embodiment 3

[0053] (1) rice husks are pulverized;

[0054] The waste rice husk after grain processing is dried and crushed through a 70-mesh sieve to obtain rice husk powder.

[0055] (2) Soak the pulverized rice husk powder at room temperature in concentrated sulfuric acid with a mass concentration of 98% for 8 minutes; then soak it in a malic acid solution with a mass concentration of 10% and heat and stir until 70° C., keep it warm for 20 minutes, and then Rinse three times with deionized water, and then air-dry the rice husk powder to obtain the treated rice husk powder.

[0056] (3) Add urea and thiourea to the rice husk powder treated in step (2), then add a mixed alkali solution of sodium hydroxide and calcium oxide, heat to 80° C., and react for 3 hours to obtain alkaline-treated rice shell powder.

[0057] Among them, the amount of thiourea added is 10% of the mass of rice husk powder after treatment, the amount of urea added is 6% of the mass of rice husk powder after treatmen...

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Abstract

The invention relates to the technical field of fireproof materials. In order to solve the problems of low fireproof performance and easy deformation in the preparation process of rice husk boards, the invention proposes a preparation method of rice husk fireproof boards. The rice husks are crushed; The rice husk is subjected to carbonization and acidification treatment respectively; the treated rice husk powder is subjected to alkaline treatment; the rice husk powder after the xanthate acidification treatment is subjected to post-processing to obtain a rice husk fireproof board. The prepared rice husk fireproof board has the advantages of light weight and high strength, good heat resistance stability, fire resistance reaching Class A, high strength, good ductility, energy saving and environmental protection, and the like.

Description

technical field [0001] The invention relates to the technical field of fireproof materials, in particular to a method for preparing fireproof boards from rice husks. Background technique [0002] Rice is a typical silicon-loving plant. Rice husk is the largest by-product in the rice production process, accounting for about 20% of the weight of mature rice, and is an important source of silicon. The ash content of the burned rice husk is between 15% and 30%, of which 87% to 97% is amorphous silicon dioxide. The traditional treatment method of rice husk is open-air incineration, because the particle size of carbonized rice husk ash after incineration is small, which will cause air pollution and water pollution. Extracting silica from rice husks can not only make full use of this agricultural waste, but also generate certain economic benefits, turning waste into treasure. Therefore, the rational development and utilization of these rice husks can not only solve the problem of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/02B27N3/10B27N1/00B27K5/00B27K9/00B27K3/16B27K3/34B27K3/52B27L11/06
CPCB27N3/02B27N3/10B27N1/00B27K5/0055B27K9/00B27K3/16B27K3/34B27K3/52B27K5/001B27L11/06B27L11/007
Inventor 郭明吴佳雨于红卫周建钟
Owner ZHEJIANG FORESTRY UNIVERSITY