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Light microporous thermal insulation castable and preparation method thereof

A castable, lightweight technology, applied in the field of refractory materials, can solve the problems of low porosity, high pore diameter, low thermal conductivity, etc., and achieve the effect of increasing porosity, improving the control of pore size, and high stability

Active Publication Date: 2015-04-29
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of the existing method for preparing lightweight heat-insulating refractory castables are: first, the porosity is not high, and the main source of pores in refractory castables is lightweight aggregate, and the porosity of prepared lightweight castables is generally lower than that of light-weight castables. The porosity of the aggregate, so that the high porosity of the lightweight castable cannot be achieved; the second is that the porosity of the castable is high but the pore size is large. For porous materials, the smaller the pore diameter, the higher the strength of the lightweight material , the thermal conductivity is low, because the number of pores in the material with small pore diameter is large, which helps to reduce heat convection and radiation at high temperature and thus reduces the thermal conductivity of the castable
[0003] "A magnesium-aluminum spinel lightweight refractory castable and its preparation method (201310004655.1)" applied by the applicant introduces a foaming agent into the magnesium-aluminum spinel lightweight refractory castable, and realizes that in the matrix of the castable The introduction of air bubbles greatly increases the porosity of the castable, but since the bubbles are formed during the stirring of the castable, more large pores are formed in the matrix, although the thermal conductivity of the castable is reduced to a certain extent, However, if the micro-nano porosity in the matrix can be realized, the thermal conductivity of the castable will be further reduced and the strength will also be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: First, mix sodium dodecylbenzenesulfonate foaming agent and water at a mass ratio of 1:10 and put it into a foaming machine to stir for 5 minutes to foam, and then add 50 wt% of foaming agent equivalent Polyaluminum chloride was stirred for 2 minutes to form a stable microporous foam for later use; light microporous corundum particles with a particle size of 0.088-8mm, corundum fine powder with a particle size of 0.009-0.088mm, alumina fine powder with a diameter of <0.009mm and Alumina hydrate was mixed at 65 wt %, 12 wt %, 10 wt %, and 13 wt % respectively, and 0.1 wt % of the sum of aggregate and matrix mass was added to the polyethylene glycol-type water reducer CAMTMENT FS10 produced by BASF, Germany. Stir for 3 minutes with 10 wt% water of the aggregate and matrix mass, then add the prepared microcellular foam to the castable (the microcellular foam is 50v% of the aggregate and matrix volume) and stir for 1 minute Then add aggregate, matrix mass and 0.5...

Embodiment 2

[0032]Example 2: First, mix sodium dodecylbenzenesulfonate foaming agent and water at a mass ratio of 1:10 and put it into a foaming machine to stir for 5 minutes to foam, and then add 50wt% of the foaming agent quality Stir polyaluminum chloride for 2 minutes to form a stable microporous foam for later use; light microporous mullite particles with a particle size of 0.088-8mm, mullite fine powder with a particle size of 0.009-0.088mm, and mullite particles with a diameter of <0.009mm Alumina micropowder and pure calcium aluminate cement were mixed at 60 wt %, 15 wt %, 10 wt %, and 15 wt %, respectively, and 0.1 wt % sodium tripolyphosphate and 0.1 wt % of six Sodium metaphosphate and 10 wt % water were stirred for 3 minutes, then the prepared microcellular foam (microcellular foam is 30v% of the sum of aggregate and matrix volume) was added to the castable, stirred for 1 minute, and then 0.5wt % Stabilizer carboxymethyl cellulose and then stir for 2 minutes to obtain light mu...

Embodiment 3

[0034] Example 3: First, mix sodium dodecylbenzenesulfonate blowing agent with water at a mass ratio of 1:10 and put it into a foaming machine to stir for 10 minutes to foam, then add 50wt% of blowing agent quality Polyaluminum chloride is stirred for 3 minutes to form a stable microporous foam for later use; light microporous perlite particles with a particle size of 0.088-0.5mm, high-alumina fine powder with a particle size of 0.009-0.088mm, and a diameter of <0.009mm Alumina micropowder, silica micropowder and high alumina cement were mixed at 50wt%, 10wt%, 10wt%, 5wt%, 25wt%, respectively, and 0.2wt% tripolyphosphoric acid of aggregate and matrix mass was added Sodium and 15wt% water of aggregate and matrix mass were stirred for 5 minutes, then the prepared microcellular foam (microcellular foam was 30v% of the sum of aggregate and matrix volume) was added to the castable and stirred for 2 Minutes later, add 1wt% stabilizer carboxymethyl cellulose and stir for 2 minutes to...

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PUM

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Abstract

The invention relates to a light microporous thermal insulation castable and a preparation method thereof. According to the invention, steady microporous foam is prepared and added into the castable, so that porosity of the castable can be improved and pores in the castable can be in micro-nano scale. 40-70wt% of light microporous particles are used as aggregate, and 10-15wt% of fine powder, 10-20wt% of micro powder and 10-25wt% of binding agent are used as matrix; moreover, microporous foam with steady bubbles, which accounts for 30-70v% of sum of aggregate and matrix, is added. The method provided by the invention guarantees the feature of larger critical particle size of the castable, and further introduces a lot of microporous foam, diameter of bubbles is not more than 0.1mm, the prepared light microporous thermal insulation castable has high porosity, high strength, low heat conductivity and good thermal shock resistant stability, and usage temperature of the castable is up to 1700 DEG C.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a lightweight microporous heat-insulating pouring material and a preparation method thereof. technical background [0002] Lightweight heat-insulating refractory castables refer to refractory castables with low thermal conductivity and low heat capacity, also known as thermal insulation refractory castables. Heat-insulating refractory castables mainly obtain low thermal conductivity by introducing pores. Generally speaking, the higher the porosity of the material, the lower the thermal conductivity, and the smaller the pore size, the lower the thermal conductivity of the material. the better. Insulating refractory materials are widely used in reducing energy consumption of high-temperature equipment and meeting special high-temperature process requirements. The problems of the existing method for preparing lightweight heat-insulating refractory castabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 张伟石干冯志远矿云辉范沐旭王刚
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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