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Tobermorite type heat-insulating material made from calcium silicate slag and preparation method

A technology of tobermolite and thermal insulation materials, which is applied in the field of thermal insulation materials, can solve problems such as restricting development, environmental pollution, and occupation of cultivated land, and achieve the effects of eliminating coal-based solid waste, reducing production costs, and reducing raw material costs

Active Publication Date: 2016-12-07
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment and utilization of coal-based solid waste such as fly ash and silicon-calcium slag have become a bottleneck restricting the development of the coal-electricity-ash-aluminum recycling industry
In addition, a large amount of coal-based solid waste has been piled up, which not only occupies a large amount of arable land, but also brings serious environmental pollution problems, causing a large number of villages to be forced to relocate

Method used

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  • Tobermorite type heat-insulating material made from calcium silicate slag and preparation method
  • Tobermorite type heat-insulating material made from calcium silicate slag and preparation method
  • Tobermorite type heat-insulating material made from calcium silicate slag and preparation method

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Effect test

Embodiment 1

[0035] The parts by weight of silicon-calcium slag, fly ash and quartz powder in the mixture are respectively: 68 parts of silicon-calcium slag, 22 parts of fly ash and 10 parts of quartz powder. Among them, the chemical composition of calcium silicate slag and fly ash is shown in Table 1, the particle size of quartz powder is less than 200 mesh, and the SiO in quartz powder 2 The content is not less than 85%.

[0036] Through the above ratio, the CaO and SiO in the mixture 2 The molar ratio is about 0.96.

[0037] The chemical composition (wt%) of table 1 calcium silicate slag and fly ash

[0038]

[0039] Mix the above mixture evenly, ball mill it to 320 mesh, and mix it with about 600 parts by weight of water (that is, the mass ratio of water to the mixture is about 6:1), inject it into the reaction kettle, and the pressure is about 1.9MPa 1. React for 4 hours at a temperature of about 210° C., and then continue to react for 3 hours at a pressure of 1.7 MPa and a temp...

Embodiment 2

[0044] The parts by weight of silicon-calcium slag, fly ash and quartz powder in the mixture are respectively: 64 parts of silicon-calcium slag, 25 parts of fly ash and 11 parts of quartz powder. Wherein, the silicon-calcium slag is according to the method described in Example 1 of the patent application CN103332710A (a method for pre-desilication of high-alumina fly ash to simultaneously reduce alkali content), and high-alumina fly ash is pre-desiliconized and soda lime is used Calcium-silicate slag by-product obtained after alumina extraction by sintering method. Fly ash is provided by High-alumina Coal Resource Development and Utilization Research Center of Datang International Power Generation Co., Ltd. The particle size of quartz powder is less than 200 mesh, and the SiO in quartz powder 2 The content is not less than 85%.

[0045] Through the above ratio, the CaO and SiO in the mixture 2 The molar ratio is about 0.95.

[0046] Mix the above raw materials evenly, ball m...

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Abstract

The invention provides a tobermorite type heat-insulating material made from calcium silicate slag and a preparation method. The tobermorite type heat-insulating material provided by the invention comprises the following raw materials: mixture, reinforced fibers and sodium silicate, wherein the mixture comprises calcium silicate slag, coal ash and silicon source supplement agent; the mole ratio of CaO to SiO2 in the mixture is 0.79-0.96; the weight of the reinforced fibers and sodium silicate is respectively 2-10% and 0.5-3% of the weight of the mixture. The invention also relates to the preparation method for the tobermorite type heat-insulating material. According to the invention, the raw materials including calcium silicate slag and coal ash are utilized to prepare the tobermorite type heat-insulating material. The tobermorite type heat-insulating material has the advantages of low cost, short reaction time, low energy consumption, product performance meeting related standard requirements, capability of digesting solid wastes including calcium silicate slag and coal ash and obvious social, economic and environmental benefits.

Description

technical field [0001] The invention relates to a calcium silicate thermal insulation material, in particular to a tobermullite thermal insulation material prepared by using calcium silicate slag and a preparation method thereof, belonging to the field of thermal insulation materials. Background technique [0002] Calcium silicate thermal insulation material has the advantages of low density, small thermal conductivity, high compressive and flexural strength, and is a high-grade thermal insulation material. Calcium silicate thermal insulation materials commonly used at this stage are divided into two types: tobermorite thermal insulation materials and xonotlite thermal insulation materials. Among them, the tobermolite type thermal insulation material is based on the hydrated calcium silicate crystal of the tobermolite group (5CaO·6SiO 2 ·5H 2 O, C 5 S 6 h 5 ) as the main component, mixed with additives and reinforced fibers, the average density is 170-220kg / m 3 , the f...

Claims

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Application Information

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IPC IPC(8): C04B28/26C04B18/04C04B18/08C04B111/28
CPCC04B18/0427C04B18/08C04B28/26C04B2111/28C04B2201/20C04B2201/32C04B2201/50C04B14/06C04B22/002C04B14/42Y02W30/91
Inventor 杨志杰陈杨孙俊民
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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