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A kind of preparation method of xonotlite type calcium silicate material

A technology of xonotlite and calcium silicate, which is applied in the field of preparation of xonotlite type calcium silicate materials, and can solve the problem that it is difficult to synthesize high-purity lightweight calcium silicate materials, and inappropriate addition of reinforcing materials such as fibers , affecting the quality of calcium silicate materials and other issues, to achieve the effect of benefiting popularization and application, short reaction time and stable product quality

Active Publication Date: 2016-08-24
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the siliceous raw materials for preparing xonotlite-type calcium silicate materials are mainly crystalline quartz sand or amorphous silica fume and diatomaceous earth. Since the siliceous raw materials are not high in purity and rich in impurities, it is difficult to Difficult to synthesize high-purity lightweight calcium silicate materials
At the same time, in the process of traditional hydrothermal synthesis of calcium silicate insulation materials, it is necessary to add organic fibers such as cotton, pulp, and artificial fibers, or inorganic fiber reinforcements (ie, reinforcing fibers) such as glass fibers and asbestos to improve the strength of the product. However, reinforcing materials such as fibers Improper addition and uneven dispersion during the molding process will seriously affect the quality of calcium silicate materials

Method used

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  • A kind of preparation method of xonotlite type calcium silicate material
  • A kind of preparation method of xonotlite type calcium silicate material
  • A kind of preparation method of xonotlite type calcium silicate material

Examples

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Effect test

example 1

[0033] The raw materials selected in the example of the present invention are silicon dioxide slag and quicklime after acid leaching magnesium from chrysotile fiber.

[0034] 1) Grinding the silica slag after acid leaching magnesium from chrysotile fiber with a silica content of 98.0% and quicklime with a CaO content of 90.0% to obtain active silica powder with a fineness of 100 mesh body and lime powder;

[0035] 2) with step 1) finely ground activated silica powder and lime powder, according to the chemical composition analysis result, according to SiO 2 / CaO molar ratio of 0.90 for batching, and placed in a mixer with a stirring device, according to the volume mass ratio of industrial water and high-activity silica powder and lime powder mixture of 12:1, add water and stir evenly, place Put it into a closed reaction kettle with a stirring device and keep it hydrothermally for 16 hours at a hydrothermal reaction temperature of 180°C and a pressure of 3.0MPa to obtain a synt...

example 2

[0039] The raw materials selected in the example of the present invention are silica slag and slaked lime after chrysotile fiber and acid salt or ammonium salt are roasted to extract magnesium; its preparation method is basically the same as that of Example 1, and will not be repeated here.

[0040]The differences are:

[0041] 1) Grinding the chrysotile fiber with a silica content of 94.3%, the silica slag after roasting and extracting magnesium with acid salt or ammonium salt, and the slaked lime with a CaO content of 73.0%, respectively, to obtain a fineness of 80 Purpose Active silica powder and slaked lime powder;

[0042] 2) with step 1) finely ground activated silica powder and slaked lime powder, according to the chemical composition analysis result, according to SiO 2 / CaO molar ratio 1.25 for batching, and placed in a mixer with a stirring device, according to the volume mass ratio of industrial water and high-activity silica powder and lime powder mixture is 11:1, ...

example 3

[0046] The raw materials selected in the example of the present invention are silica slag after acid leaching magnesium from serpentine tailings and caustic lime mud calcined powder at 1000°C; the preparation method is basically the same as that in Example 1, and will not be repeated here.

[0047] The differences are:

[0048] 1) The silica slag after acid leaching magnesium from serpentine tailings with a silica content of 89.7% and the calcined caustic lime mud calcined at 1000°C with a CaO content of 90.0% were respectively ground to obtain 200 mesh Activated silica powder and lime powder;

[0049] 2) Step 1) the finely ground high-activity silica powder and lime powder, according to the chemical composition analysis results, according to SiO 2 The / CaO molar ratio is 0.85 for batching, and placed in a mixer with a stirring device, according to the volume mass ratio of industrial water, high-activity silica powder and lime powder mixture of 15:1, add water and stir evenly...

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Abstract

The invention relates to a method of preparing a xonotlite-type calcium silicate material from active silicate dioxide and calcareous raw materials. The preparation method comprises the following steps: (1) individually grinding active silicon dioxide and calcareous raw materials so as to obtain active silicon dioxide powder and lime powder; (2) blending the active silicon dioxide powder and lime powder obtained in the step (1) according to a certain ratio, then transferring the mixture to a mixer with a stirring device, adding industrial water, evenly stirring to obtain a uniform material, after a moulding treatment or directly transferring the uniform material to an enclosed reactor, and controlling the temperature rising speed, the reaction temperature, and reaction time to carry out synthesis reactions; (3) moulding and / or drying the reaction products obtain in the step (2) so as to obtain the xonotlite-type calcium silicate material. The xonotlite-type calcium silicate material has the advantages of no toxicity, safety, low density, high strength, low heat conductive coefficient, and good chemical stability, and can be used in the industries such as electric power, chemical engineering, metallurgy, textile, building material, and the like.

Description

technical field [0001] The invention relates to a method for preparing a xonotlite type calcium silicate material by using active silicon dioxide and calcareous raw materials, and belongs to the field of preparation and application of inorganic non-metallic materials and energy-saving building materials. Background technique [0002] Calcium silicate material is made of siliceous raw materials and calcium raw materials through batching, hydrothermal synthesis, pressure filtration, molding, drying and other processes to make thermal insulation materials. There are two main types of calcium silicate materials, one is tobermolite type and the other is xonotlite type. Xonotlite type calcium silicate material can be used in insulation and heat preservation of thermal equipment and pipelines, as well as heat insulation and heat preservation of buildings, ships and trains due to its characteristics of small bulk density, high strength, small thermal conductivity, high temperature r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24
Inventor 彭同江宋鹏程孙红娟段涛
Owner SOUTHWEAT UNIV OF SCI & TECH
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