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Method for preparing calcium silicate thermal insulation material

A thermal insulation material, calcium silicate technology, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve pollution and other problems, and achieve the effect of strong operability, easy control, and short process

Inactive Publication Date: 2015-01-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method for preparing calcium silicate thermal insulation material by using sodium calcium silicate as raw material by hydrochemical method, but sodium calcium silicate is not a primary mineral, and high-silicon raw materials such as fly ash, coal gangue, and quartz sand can be used Obtained through chemical conversion, so the present invention can indirectly solve the pollution problems such as fly ash, and at the same time, realize high-value utilization of fly ash, etc.

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  • Method for preparing calcium silicate thermal insulation material

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Embodiment 1

[0019] The raw material of this example is solid slag with sodium calcium silicate as the main component obtained by chemical conversion of fly ash, and its main component is 19.13% Na 2 O, 30.67% SiO 2 and 34.91% CaO, the main component is sodium calcium silicate (NaCaHSiO 4 ). Mix the above solid slag with dilute lye, the mass ratio of the two is 1:30, Na in the dilute lye 2 The O concentration meter is 0.1g / L; after mixing, the slurry is decomposed in the reactor, the reaction temperature is 170°C, the reaction time is 4h, and vacuum filtration is carried out after the reaction; Molding, the molding pressure is maintained at 0.2MPa; finally, the molded product is dried at 100°C for 3 hours, and the bulk density of the molded material is 209kg / m 3 .

Embodiment 2

[0021] Select the solid slag among the embodiment 1 equally as raw material, main component is 19.13% Na 2 O, 30.67% SiO 2 and 34.91% CaO, mainly in the form of sodium calcium silicate (NaCaHSiO 4 ). Mix the above solid slag with dilute lye, the mass ratio of the two is 1:5, Na in the dilute lye 2 The O concentration meter is 40g / L; after mixing, the slurry is decomposed in the reactor, the reaction temperature is 90°C, the reaction time is 20h, vacuum filtration is carried out after the reaction; the slag phase obtained after the suction filtration is formed by a selected mold , the molding pressure was maintained at 0.2MPa; finally, the molded product was dried at 150°C for 2 hours, and the bulk density of the molding material was 617kg / m 3 .

Embodiment 3

[0023] Select the solid slag among the embodiment 1 equally as raw material, main component is 19.13% Na 2 O, 30.67% SiO 2 and 34.91% CaO, mainly in the form of sodium calcium silicate (NaCaHSiO 4 ). Mix the above solid slag with dilute lye, the mass ratio of the two is 1:20, Na in the dilute lye 2 The O concentration meter is 40g / L; after mixing, the slurry is decomposed in the reactor, the reaction temperature is 260°C, the reaction time is 2h, vacuum filtration is carried out after the reaction; the slag phase obtained after the suction filtration is formed by a selected mold , the molding pressure is maintained at 0.2MPa; finally, the molded product is dried at 120°C for 2 hours, and the bulk density of the molding material is 286kg / m 3 .

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Abstract

The invention provides a method for preparing a calcium silicate thermal insulation material by decomposition of sodium calcium silicate, wherein the method comprises the following steps: (1) mixing sodium calcium silicate and a diluted alkali liquid in proportion, carrying out a reaction for 2-20 h at the temperature of 90-260 DEG C, and filtering to obtain a wet calcium silicate slag; (2) carrying out compression molding of the wet calcium silicate slag obtained in the step (1) in a mold; and (3) drying the sample molded in the step (2), to obtain the calcium silicate thermal insulation product. The method is adopted to prepare the calcium silicate thermal insulation material, and has the advantages of simple steps and low energy consumption; the raw materials can be a mixture taking sodium calcium silicate as a main component and obtained by chemical conversion of fly ash, coal gangue, kaolin, quartz sand and other high-silicon minerals, also can be a pure sodium calcium silicate obtained by chemical conversion of pure silica, raw material sources are extensive, not only is the problem of environmental pollution solved, but also the mineral high value utilization is realized; and the prepared calcium silicate finished product has the advantages of low volume weight and excellent thermal insulation property.

Description

technical field [0001] A method for preparing a novel calcium silicate heat insulating material, in particular to a new method for preparing a calcium silicate heat insulating material using sodium calcium silicate as a raw material. Background technique [0002] Calcium silicate is an excellent thermal insulation material, and the high-performance calcium silicate thermal insulation material has been in short supply in the Chinese market. At present, the preparation of calcium silicate thermal insulation materials is made of siliceous raw materials such as diatomite and quartz sand and calcium raw materials such as lime through mixing, pressing, steaming, drying and other processes. Fiber and other materials increase its performance, such as the method for preparing environmentally friendly calcium silicate thermal insulation products invented by Hebei Liaoyuan Diatom Material Co., Ltd. (CN102173714A), and the high-temperature-resistant, high-strength, high-density calcium ...

Claims

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Application Information

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IPC IPC(8): C01B33/24
Inventor 马淑花唐振华丁健王月娇郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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