Special refractory and acid-resistant brick and its preparation method

An acid-resistant brick and refractory technology, applied in the field of refractory materials, can solve the problems that the compressive strength and thermal shock stability at room temperature cannot be well met, and the higher requirements for the performance of refractory and acid-resistant bricks, and achieve low porosity and acid erosion resistance. Strong, high volume density effect

Inactive Publication Date: 2011-12-21
GONGYI WINNA SCI & TECH DEV
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  • Abstract
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Problems solved by technology

Even the relatively high-quality West German products currently on the market cannot meet the higher requirements of more advanced acid regeneration roasters on the performance of refractory and acid-resistant bricks in terms of normal temperature compressive strength and thermal shock stability.
[0003] In the prior art, there are also many literature reports about acid-resistant bricks, such as: 1. The application number is 01115503.5, and the title of the invention is "refractory acid-resistant brick and its preparation method". , pyrophyllite, mullite, quartz, kyanite, white corundum, clay, silica micropowder, potassium feldspar, etc. are prepared as a kind of fire-resistant and acid-resistant material with high bulk density and high refractoriness. Bricks; but the volume density of the refractory and acid-resistant bricks prepared by the invention is 2.26g / cm 3 , The apparent porosity is 16%, etc.

Method used

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  • Special refractory and acid-resistant brick and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: A kind of special refractory and acid-resistant brick and its preparation method

[0028] The raw material formula of special refractory and acid-resistant bricks (expressed in weight percentage):

[0029] Fused Mullite 20%, Fused Corundum 20%, a-Al 2 O 3 20%, Suzhou Clay 10%, Silica 15%, Talc 10% and SiO 2 Micronized 5%.

[0030] Preparation method of special refractory and acid-resistant bricks:

[0031] According to the raw material ratio of the above-mentioned special refractory and acid-resistant bricks, the ingredients and binders are prepared, that is, the sulfite pulp waste liquid (the specific gravity of the sulfite pulp waste liquid is 1.25g / cm2). 3 ) into the wheel mill for mixing and milling. The mixing time is 20 minutes. The amount of sulfite pulp waste liquid added accounts for 4% of the total raw material. After mixing and milling, the material is trapped for 24 hours. The machine is formed into bricks, the forming pressure of the pres...

Embodiment 2

[0032] Embodiment 2: It is basically the same as Embodiment 1, and the difference is:

[0033] The raw material formula of special refractory and acid-resistant bricks: 50% fused mullite, 10% fused corundum, a-Al 2 O 3 15%, Suzhou Clay 5%, Silica 10%, Talc 4% and SiO 2 Micronized 6%.

[0034] The preparation method of the special refractory and acid-resistant brick is basically the same as that of the first embodiment, except that the mixing time is 15 minutes, the amount of sulfite pulp waste liquid added accounts for 3% of the total raw materials, and the trapping time is 22 hours. The molding pressure of the press was 370 tons, the drying temperature was 120°C, the drying time was 14 hours, the firing temperature was 1550°C, and the holding time was 10 hours.

Embodiment 3

[0035] Embodiment 3: It is basically the same as Embodiment 1, and the difference is:

[0036] The raw material formula of special refractory and acid-resistant bricks: fused mullite 30%, fused corundum 15%, a-Al 2 O 3 10%, Suzhou Clay 12%, Silica Powder 20%, Talc Powder 8% and SiO 2 Micronized 5%.

[0037]The preparation method of the special refractory and acid-resistant brick is basically the same as that of the first embodiment, except that the mixing time is 10 minutes, the amount of sulfite pulp waste liquid added accounts for 5% of the total amount of raw materials, and the trapping time is 26 hours. The molding pressure of the press was 350 tons, the drying temperature was 150°C, the drying time was 11 hours, the firing temperature was 1500°C, and the holding time was 11 hours.

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Abstract

The invention discloses a special fire-resistant and acid-resistant brick, which is represented by weight percentage. The raw material of the fire-resistant and acid-resistant brick contains 20-50% of mullite, 5-20% of corundum, 35-20% of a-Al2O, and 2% of bonded clay. ~12%, silica powder 5~20%, talcum powder 3~10% and SiO2 fine powder 2~6%. The materials are configured according to the proportioning ratio, then mixed and milled with a binder, trapped, dried, finally fired, and cooled naturally to obtain the special refractory and acid-resistant brick of the present invention. The product of the present invention uses mullite, corundum and clay as the main raw materials, and introduces some additives, so that the prepared product has high bulk density, low porosity, high compressive strength, strong wear resistance, and acid erosion resistance. Strong and other characteristics, and the high temperature index load softening temperature and refractoriness of the product of the present invention are far superior to conventional acid-resistant bricks, and can be widely used in acid regeneration roasters, petroleum, chemical industry, metallurgy, electric power, chemical fiber, papermaking, pharmaceuticals, chemical fertilizers, food And other anti-corrosion works.

Description

1. Technical field: [0001] The invention relates to a refractory material, in particular to a special refractory acid-resistant brick and a preparation method thereof. 2. Background technology: [0002] At present, conventional acid-resistant bricks are prepared from quartz, feldspar, and clay as the main raw materials. Refractory and acid-resistant bricks are mainly used in acid regeneration roasters. This product is mainly imported in my country, and the market price is relatively expensive (more than 50,000 yuan per ton). With the progress of industrial technology, the performance indicators of refractory and acid-resistant bricks are proposed. higher requirement. Even the relatively good West German products currently on the market cannot well meet the higher requirements of the more advanced acid regeneration calciners for the performance of refractory and acid-resistant bricks in terms of normal temperature compressive strength and thermal shock stability. [0003] In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 校松波王少辉郝凌君王岭渠赵永安李明欢
Owner GONGYI WINNA SCI & TECH DEV
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