Process for manufacturing xonotlite type calcium silicate heat insulation material

A technology of thermal insulation materials and process methods, applied in the field of manufacturing xonotlite type calcium silicate thermal insulation materials, which can solve the problems of low utilization rate of raw materials, unstable product quality, and inability to change the speed of rotation, etc., to achieve small bulk density and high yield High, the effect of preventing drying shrinkage

Inactive Publication Date: 2010-11-10
ZHEJIANG ASKER TECH
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Problems solved by technology

[0008] In view of the above-mentioned domestic method of one-time feeding and the rotation speed cannot be changed during the reaction process, the produced calcium silicate secondary particles are generally in the form of agglomerates instead of hollow particles, resulting in large pr

Method used

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  • Process for manufacturing xonotlite type calcium silicate heat insulation material
  • Process for manufacturing xonotlite type calcium silicate heat insulation material

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Embodiment Construction

[0029] 1. Formula. Silicon dioxide 2.56%, calcium hydroxide 3.06%, silica sol 0.06%, wollastonite 0.42%, cotton fiber 0.2%, glass fiber 0.2%, water 93.5%.

[0030] 2. Manufacturing steps:

[0031] The first step: raw material selection. Choose high-quality limestone, calcinate at 900°C, and digest under strong stirring. The water temperature should be above 80°C, and the water volume should be 10 times. Choose quartz sand and other auxiliary materials with a silica content ≥ 98% and a particle size of about 400 mesh.

[0032] Step Two: Toppings. According to Ca / Si molar ratio=0.55, water-solid ratio=16~20 batching. Calcium hydroxide 1.68%, silicon dioxide 2.56%, silica sol 0.06, wollastonite 0.42% ingredients, water 78%. Stir and mix evenly and pour into the dynamic reaction kettle.

[0033] The third step: slurry pre-reaction. Steam heating, the temperature is raised to 215°C within one and a half hours, and kept for 1 hour. Then the temperature was raised to 225° C.,...

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Abstract

The invention relates to a process for manufacturing a xonotlite type calcium silicate heat insulation material. The heat insulation material comprises the following raw materials in percentage by weight: 2.3 to 2.7 percent of superfine quartz sand, 3 to 3.3 percent of active calcium hydroxide, 0.04 to 0.1 percent of silica sol, 0.3 to 0.5 percent of wollastonite, 0.1 to 0.3 percent of cotton fiber, 0.1 to 0.3 percent of glass fiber and 92 to 94 percent of water. The process comprises the following steps of: 1, raw material selection; 2, burdening; 3, slurry pre-reaction; 4, secondary addition; 5, active slurry synthesis of the xonotlite; 6, compression molding; and 7, drying, packing and warehousing. The heat insulation material has the advantages of light capacity, stable quality, high utilization rate of the raw materials, high finished product rate and the like.

Description

(1) [Technical field] [0001] The invention relates to a process for manufacturing xonotlite type calcium silicate thermal insulation material. (2) [Background Technology] [0002] The maximum service temperature of xonotlite type calcium silicate insulation material is 1000℃, and it is usually manufactured by dynamic synthesis method. The process flow is as follows: [0003] Step 1: Ingredients. by CaO / SiO 2 Molar ratio and water-material ratio Add quantitative powdered quartz and water, stir and mix evenly, and then pour into the dynamic reaction kettle. Production ingredients CaO / SiO 2 The molar ratio is usually controlled at 0.90-0.97, and the water-material ratio is 18-24 times. [0004] The second step: synthesis of xonotlite active slurry. The synthesis reaction is carried out in an autoclave with a stirring device. In a large amount of water medium, the primary particles of needle-shaped and fibrous xonotlite crystals are intertwined with each other at a certain s...

Claims

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Application Information

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IPC IPC(8): C04B28/24C04B14/06
CPCC04B2111/28C04B28/24Y02W30/91C04B14/043C04B14/06C04B14/42C04B18/248C04B20/0076C04B22/064C04B40/0071
Inventor 裘茂法郭子龙裘益奇
Owner ZHEJIANG ASKER TECH
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