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Early-strength quick-drying refractory mud filling material with good insulativity

A refractory mud and insulating technology, applied in the field of refractory mud filler, can solve the problems of reducing the insulation resistance of thermocouples, high dosage of magnesium phosphate solution, corrosion of metal welding points, etc. Effect of Insulation Resistance Lowering

Active Publication Date: 2011-10-19
马鞍山江润冶金有限责任公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] (3) Because the characteristics of magnesium phosphate solution are slightly acidic, especially in the south of my country, the weather is humid and easy to absorb moisture, which will reduce the insulation resistance of thermocouples. Generally, the insulation resistance of thermocouples produced in different seasons differs by several hundred megohms;
[0006] (4) When thermocouples are produced in winter, the amount of magnesium phosphate solution is often too high, and the acidity ratio of the product increases. In high temperature use, it will cause local pollution of the two poles of the thermocouple, corrode metal welding points, and even cause pulverization of the quartz tube. , there is a large temperature measurement deviation

Method used

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  • Early-strength quick-drying refractory mud filling material with good insulativity
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Examples

Experimental program
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Effect test

Embodiment 1

[0068] 20 parts of mullite with a particle size of ≤76 μm, 5 parts of alumina micropowder with a particle size of 2 to 5 μm, 20 parts of quartz sand with a particle size of ≤76 μm, Al 2 o 3≥75% pure calcium aluminate cement 55 parts, compound admixture 1.6 parts. Among them, composite admixtures: 1 part of subnano alumina micropowder with a particle size of 0.25-0.50 μm, 0.1 part of sodium tripolyphosphate, 0.2 part of lignosulfonate, and 0.3 part of sodium carboxymethyl cellulose. Stir the dry powder in a mud mixer for 2 minutes, add water and stir for 3 minutes, and place it for 30 minutes before grouting. The semi-finished product is naturally cured for 24 hours and baked at 60°C for 48 hours to complete.

Embodiment 2

[0070] 5 parts of alumina fine powder with a particle size of 2-5 μm, 40 parts of quartz sand with a particle size of ≤76 μm, Al 2 o 3 ≥75% pure calcium aluminate cement 55 parts, compound admixture 1.6 parts. Among them, composite admixtures: 1 part of subnano alumina micropowder with a particle size of 0.25-0.50 μm, 0.1 part of sodium tripolyphosphate, 0.2 part of lignosulfonate, and 0.3 part of sodium carboxymethyl cellulose. Stir the dry powder in a mud mixer for 2 minutes, add water and stir for 3 minutes, and place it for 30 minutes before grouting. The semi-finished product is naturally cured for 24 hours and baked at 60°C for 48 hours to complete.

Embodiment 3

[0072] 40 parts of mullite with a particle size of ≤76 μm, 5 parts of alumina micropowder with a particle size of 2 to 5 μm, Al 2 o 3 ≥75% pure calcium aluminate cement 55 parts, compound admixture 1.7 parts. Among them, composite admixtures: 1 part of subnano alumina micropowder with a particle size of 0.25-0.50 μm, 0.1 part of sodium hexametaphosphate, 0.1 part of sodium tripolyphosphate, 0.2 part of lignosulfonate, and 0.3 part of sodium carboxymethylcellulose. Stir the dry powder in a mud mixer for 2 minutes, add water and stir for 3 minutes, and place it for 30 minutes before grouting. The semi-finished product is naturally cured for 24 hours and baked at 60°C for 48 hours to complete.

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Abstract

The invention discloses an early-strength quick-drying refractory mud filling material with a good insulativity. The filling material is prepared through the following steps: adding water in 100 parts of main raw material and 1-10 parts of composite additives, mixing, ageing mixture or fermenting, grouting, naturally drying and baking, wherein the main raw material is a mixture of sintered mullite, quartz sand powder, alumina micropowder and pure calcium aluminate cement; and the composite additives are lignosulfonate, sodium carboxymethylcellulose and one substance or a mixture of two substances selected from subnano alumina micropowder with a grain size of 0.25-0.50 mu m, silicon micropowder with a grain size of 1-2 mu m, sodium tripolyphosphate, sodium hexametaphosphate and sodium polyphosphate. The filling material has good properties such as good early strength, rapid consolidation speed, no moisture regain and good insulativity, dose not corrode metals, can be widely applied to a metallurgy smelting high temperature sensor and a rapid temperature-measuring element to be used as an insulation material.

Description

technical field [0001] The invention relates to a refractory mud filling material, in particular to a refractory mud filling material with good early strength, fast consolidation speed, no moisture return, no corrosion of metal, and good insulation, which can be used as a high temperature sensor and a rapid temperature measuring element Used as insulating material. Background technique [0002] In the process of metal smelting, the parts of the temperature measuring end that use the thermocouple to measure the temperature must be filled with fillers with good insulation, otherwise the temperature measurement deviation will be formed due to the short circuit of the hot electrode. The traditional rapid temperature measuring element filling material is formulated with a mixture of magnesium phosphate solution and aluminum oxide developed in the 1980s. Due to the limitation of the characteristics of the magnesium phosphate solution, the process is very demanding on the environm...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 季必云严解荣王建庭卜巧英王筱龙
Owner 马鞍山江润冶金有限责任公司
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