Special type fire-resistant and acid-resistant brick and preparation method thereof

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. The effect of strong resistance and high compressive strength

Inactive Publication Date: 2010-01-27
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 type fire-resistant and acid-resistant brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0028] 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 Powder 15%, Talc Powder 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 prepared materials and binder, that is, sulfite pulp waste liquid (the specific gravity of sulfite pulp waste liquid is 1.25g / cm 3 ) into the wheel mill for mixed milling, the mixed milling time is 20 minutes, the addition of sulfite pulp waste liquid accounts for 4% of the total amount of raw materials, after the mixed milling, the material is trapped for 24 hours, and after the trapped material, the material is subjected to pressure The mach...

Embodiment 2

[0032] Embodiment two: basically the same as embodiment one, the difference is:

[0033] Raw material formula of special fire-resistant and acid-resistant bricks: 50% fused mullite, 10% fused corundum, a-Al 2 o 3 15%, Suzhou clay 5%, silica powder 10%, talcum powder 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 Example 1, except that the mixing and milling time is 15 minutes, the amount of sulfite pulp waste liquid accounts for 3% of the total amount of raw materials, and the trapped time is 22 hours. The molding pressure of the press is 370 tons, the drying temperature is 120°C, the drying time is 14 hours, the firing temperature is 1550°C, and the holding time is 10 hours.

Embodiment 3

[0035] Embodiment three: basically the same as embodiment one, the difference is:

[0036] Raw material formula of special fire-resistant and acid-resistant bricks: 30% fused mullite, 15% fused corundum, a-Al 2 o 3 10%, Suzhou clay 12%, silica powder 20%, talcum 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 Example 1, the difference being that the mixing and milling time is 10 minutes, the addition of sulfite pulp waste liquid accounts for 5% of the total amount of raw materials, and the trapping time is 26 hours. The molding pressure of the press is 350 tons, the drying temperature is 150°C, the drying time is 11 hours, the firing temperature is 1500°C, and the holding time is 11 hours.

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Abstract

The invention discloses a special type fire-resistant and acid-resistant brick which comprises raw materials by weight percent: 20-50% of mullite, 5-20% of corundum, 5-20% of a-Al2O3, 2-12% of binding clay, 5-20% of silica powder, 3-10% of talcum powder and 2-6% of SiO2 micro powder. The raw materials are mixed together based on the mixture ratio, and then are ground in a mixing way, processed by ageing, dried and finally sintered together with bonding agent; after being naturally cooled, the special type fire-resistant and acid-resistant brick can be obtained. The special type fire-resistant and acid-resistant brick takes the mullite, the corundum and the clay as main raw materials and is introduced with part of additive, so that the prepared product has the characteristics of higher volume density, low air porosity, high compression strength, strong abrasive resistance and acid attack resistance and the like; furthermore, the special type fire-resistant and acid-resistant brick is superior to the conventional acid-resistant brick in high temperature indexes such as refractoriness under load and refractoriness, so as to be widely applied to an acid regeneration calcinatory as well as anti-corrosion engineering of petroleum, chemical engineering, metallurgy, electrical power, chemical fiber, paper making, pharmacy, fertilizer, food and the like.

Description

1. Technical field: [0001] The invention relates to a refractory material, in particular to a special refractory and acid-resistant brick and a preparation method thereof. 2. Background technology: [0002] At present, conventional acid-resistant bricks are made of quartz, feldspar, clay, etc. as the main raw materials. Refractory and acid-resistant bricks are mainly used in acid regeneration roasting furnaces. This product mainly relies on imports in my country, and the market price is relatively expensive (more than 50,000 yuan per ton). higher requirement. Even the relatively high-quality West German products currently on the market cannot meet the higher requirements for the performance of refractory and acid-resistant bricks of more advanced acid regeneration roasters 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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