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Tombstone material and tombstone thermal insulation material and preparation method thereof

A technology of tobermorite and thermal insulation material, applied in silicate, alkaline earth metal silicate and other directions, can solve the problems of high cost, poor economic benefit, huge water consumption, etc., to improve compression resistance and avoid vegetation damage , the effect of simple process

Active Publication Date: 2017-02-15
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can produce calcium silicate slag composite cement mixture with high activity index, the water consumption is huge, the cost is high, and the economic benefit is poor.

Method used

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  • Tombstone material and tombstone thermal insulation material and preparation method thereof
  • Tombstone material and tombstone thermal insulation material and preparation method thereof
  • Tombstone material and tombstone thermal insulation material and preparation method thereof

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preparation example Construction

[0055] The preparation method of the xonotlite-type thermal insulation material according to a specific embodiment of the present invention will be described below by taking the silicon-containing powdery industrial waste as fly ash as an example. Such as figure 1 Shown, the preparation method of xonotlite type insulation material provided by the invention may further comprise the steps:

[0056] (1) Perform pre-desilication reaction with fly ash and sodium hydroxide solution with a concentration of 10-20% by weight at a certain liquid-solid ratio. The pre-desilication temperature is 80-140°C, and the reaction time is 0.5-2h. After the end, the sodium silicate solution and desiliconized fly ash are obtained through solid-liquid separation, and the sodium silicate solution can be used as a binder for the preparation of thermal insulation products;

[0057] (2) Mix and sinter the desiliconized fly ash obtained in step (1) with calcium-containing raw materials such as calcium ox...

Embodiment 1

[0068] (1) fly ash (from Shenhua Zhuneng Power Plant, the total content of alumina, silicon oxide and calcium oxide is 80% by weight, and the content of silicon oxide is 34% by weight) and 8% by weight of sodium hydroxide aqueous solution by weight Mix at a ratio of 1:5 for pre-desilication reaction. The pre-desilication temperature is 130°C and the reaction time is 2 hours. After the reaction is completed, sodium silicate solution and desiliconized fly ash (silicon oxide content 25% by weight), sodium silicate solution can be used as a binder for the preparation of thermal insulation products;

[0069] (2) Mix and sinter the desiliconized fly ash obtained in step (1) with calcium oxide and sodium carbonate at a calcium ratio of 0.9 and an alkali ratio of 1 to obtain sintered clinker. The sintering temperature is 950°C and the sintering time is 2 hours;

[0070] (3) Break the clinker obtained in step (2) to 100 mesh, and use the adjustment solution (NaOH and NaOH 2 CO 3 A mi...

Embodiment 2

[0077] (1) Combine fly ash (Shenhua Inner Mongolia Guohua Zhungeer Power Generation Co., Ltd., the total content of alumina, silicon oxide and calcium oxide is 85% by weight, and the content of silicon oxide is 40% by weight) with 14% by weight of hydrogen Sodium oxide aqueous solution is mixed at a weight ratio of 1:4 for pre-desilication reaction. The pre-desilication temperature is 100°C and the reaction time is 1.2h. After the reaction is completed, the sodium silicate solution and desiliconization powder are obtained by solid-liquid separation. Coal ash (silicon oxide content is 26% by weight), sodium silicate solution can be used as a binder for the preparation of thermal insulation products;

[0078] (2) Mix and sinter the desiliconized fly ash obtained in step (1) with calcium oxide and sodium carbonate at a calcium ratio of 1 and an alkali ratio of 0.9 to obtain sintered clinker. The sintering temperature is 1150°C and the sintering time is 1.5h;

[0079] (3) Break th...

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Abstract

The invention discloses a xonotlite material, a preparation method thereof, a xonotlite thermal-insulation material prepared from the xonotlite material and a preparation method thereof. The preparation method of the xonotlite material comprises the following steps of a, adding a calcium-containing raw material and an alkali metal oxygen-containing compound in silicon-containing powdery industrial waste, and carrying out mixing and sintering to obtain a sinter mixture, b, carrying out dissolution and dealkalization on the sinter mixture by an adjustment liquid to obtain calcium silicate and c, carrying out a reaction process on the calcium silicate at a temperature of 200-350 DEG C for 1-20h to obtain xonotlite slurry. The xonotlite material has the characteristics of bird nest shape, no binder between crystals, crystal pureness, low unit weight and high strength.

Description

technical field [0001] The invention relates to a preparation method of a xonotlite material, a xonotlite material prepared by the method, a xonotlite-type thermal insulation material containing the calcium xonotlite material and a preparation method thereof. Background technique [0002] Dealumination residue, also known as silicon-calcium slag, is the residue left after alumina is extracted from high-alumina fly ash. The extraction of alumina from high-alumina fly ash originated in the 1950s, and foreign countries were the first to successfully extract alumina from fly ash (alumina content greater than 30%). As our environmental protection policies become increasingly stringent and the crisis of shortage of high-grade bauxite resources intensifies, in recent years various places have begun to adopt the technology of extracting alumina from high-alumina fly ash, which can use fly ash to a certain extent and alleviate the problem of my country's bauxite mines. The resource s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24
Inventor 刘晓婷王宝冬孙琦卓锦德王霞肖永丰赵利军
Owner CHNA ENERGY INVESTMENT CORP LTD