Fire clay for silica brick building body of industrial kiln stove

A kiln and silica brick technology, which is applied in the field of industrial kiln and oxy-combustion industrial kiln, can solve the problems that the upper silica brick masonry is easy to expand and crack, affects the service life of industrial kiln, and has poor alkaline corrosion resistance. , to achieve the effects of small thermal expansion coefficient, improved service life and simple masonry construction

Inactive Publication Date: 2013-01-09
CHINA LIGHT IND INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high thermal expansion coefficient and poor alkali corrosion resistance of the existing siliceous mortar used in domestic industrial kilns and other quality problems, the upper silica brick masonry is prone to expansion and cracking, erosion to form rat holes, fire penetration, and even top collapse Accidents seriously affect the service life of industrial kilns

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Recipe:

[0014] Fused silica aggregate SiO2≥99.5%, particle size 200 mesh, the mixing ratio is 90% of the powder weight, silica fume SiO2≥96%, particle size 800 mesh, the mixing ratio is 10% of the powder weight, and the additive concentration is 15% when used The industrial phosphoric acid, its dosage is 8% of powder weight.

[0015] The physical and chemical properties of the obtained product are shown in the table below

[0016] Silica fire clay powder: Appearance is off-white powder, refractoriness > 1730 ℃. The chemical composition is shown in the table below:

[0017] project SiO2 Al2O3 Fe2O3 MgO CaO NaO average value 98.5％ 0.1％ 0.2％ 0.1％ 0.1％

Embodiment 2

[0019] Recipe:

[0020] Fused silica aggregate SiO2≥99.5%, particle size 200 mesh, mixing ratio is 90% of powder weight, silica fume SiO2≥96%, particle size 800 mesh, mixing ratio is 10% of powder weight

[0021] The amount of the additive aluminum dihydrogen phosphate (solid) is 4% of the powder weight.

[0022] Add water directly when using.

[0023] The processing technology of fire clay:

[0024] Waste blocks of fused silica products→crushing and grinding→sieving→iron removal→weighing

[0025] Silica fume→sieving→iron removal→weighing

[0026] Aluminum dihydrogen phosphate → weighing

[0027] The above-mentioned iron removal step can adopt a magnet method to separate iron. If it is a ready-made commodity purchased from the market, since iron has been removed, the producer does not need to remove iron separately.

[0028] Mix the above-mentioned amount of materials and fill them in separate bags.

[0029] The main index of siliceous fire clay of the present invention...

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Abstract

The invention discloses a fire clay for a silica brick building body of an industrial kiln stove. The fire clay contains powder materials composed of a main raw material and an auxiliary raw material and an additive, wherein fused quartz aggregate SiO2 occupying equal to or larger than 99.5% is adopted as the main raw material, silicon fume SiO2 occupying equal to or larger than 94% is adopted as the auxiliary raw material, and the additive is phosphoric acid or aluminium dihydrogen phosphate solid. The fire clay has the advantages of being very small in thermal expansion coefficient and capable of reducing expansion and deformation of the silica building body in the temperature rising process of the stove and enabling the stove to be simple to operate and safe and reliable. The fire-resisting degree of the fire clay reaches above 1730 DEG C, is high in SiO2 content and free of CaO, accordingly is high in high-temperature alkali-resistant corrodibility, and the combustion condition at the reducing atmosphere is met. The fire clay is small in granularity, high in viscosity and simple in masonry construction, can meet the requirement that the masonry mortar joint is smaller than 1.5mm, ensures masonry quality and can prolong service life of the kiln stove.

Description

technical field [0001] The present invention relates to a kind of fire mud used for the silica brick masonry of industrial kiln, especially the siliceous fire mud used in the upper space of high temperature industrial kiln and the silicon masonry of regenerator, especially a kind of fire mud for reducing NOx emission Industrial kilns and full-oxygen combustion industrial kilns using reducing atmosphere combustion technology. Background technique [0002] Industrial kilns are thermal equipment in glass, metallurgy, ceramics, cement and other industries. Industrial kilns are made of various refractory materials. Silica bricks are one of the main refractory materials used in high-temperature areas of industrial kilns. The quality of the masonry has a great influence on the service life and energy consumption of the kiln, and the siliceous mortar used in the silica brick is the weakest point of the masonry. [0003] With the development and improvement of industrial kiln produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 梁德海张占彪
Owner CHINA LIGHT IND INT ENG CO LTD
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