CN104609870A - Preparation method of porous brick - Google Patents

Abstract

The invention discloses a preparation method of a porous brick. The preparation method comprises the following steps: separately preliminarily crushing sintered corundum, compact fused corundum, spinel, magnesia, polypropylene fiber, chromium trioxide, pure calcium aluminate cement, and alumina micro powder; milling the mixture with water in a ball mill; sieving the obtained product to obtain slurry; compressing the resultant slurry till the water content of the slurry reaching 6%; putting the obtained product into a die for vibration molding; allowing the obtained product to stand for 6h; performing demoulding; drying the obtained product at a temperature range of 440-450 DEG C for 2h; putting the obtained product on a backing plate by using a vacuum absorber; and putting the obtained product together with the backing plate into a roller kiln for burning to prepare the porous brick. The porous brick prepared in the invention has advantages of good anti-compression capability, long service time, and high temperature resistance, and has compression strength reaching to more than 45 Mpa. A piece of the porous brick can be reused more than 95 times.

Description

The preparation method of gas permeable brick

Technical field

The present invention relates to steelmaking technical field, especially a kind of preparation method of gas permeable brick.

Background technology

External refining is one of most important process procedure of modern steel-making.And the gas permeable brick requisite functional element that is external refining.In recent years, China has introduced more large-scale refining unit, and these refining unit techniques are strict, and working conditions is harsh, to life-span of gas permeable brick, blows out the performance such as rate, Air permenbility and has higher requirement.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of preparation method with long service life, the gas permeable brick that high temperature resistant, good permeability, anti-pressure ability are strong.

For solving the problems of the technologies described above, the technological method that the present invention adopts is:

A preparation method for gas permeable brick, adopts by the raw material production of following mass percent: alundum 55%, fine and close fused corundom 20%, spinel 10%, magnesia 0.95%, polypropylene fibre 0.05%, chromium trioxide 3%, pure calcium aluminate cement 2%, alumina powder 9%;

Its preparation method comprises the following steps:

A, the raw material of above-mentioned parts by weight is carried out preliminary fragmentation respectively after, add ball milling in ball mill and mix, then add the water with 30% of raw mixture quality, carrying out being ground to particle diameter is 300 orders, sieves, and then will obtain slurry reduction to water content is 6%;

Mould vibratory compaction put into by B, slurry steps A obtained, and then leaves standstill 6h;

C, after step B leaves standstill and terminates, the demoulding, then first at 440 DEG C ~ 450 DEG C dry 2 hours, put it on backing plate with vacuum absorber again, and send in roller way kiln together with described backing plate and fire, firing temperature controls at 1200 DEG C, fires and namely obtains this gas permeable brick in 1 hour.

Owing to have employed technique scheme, compared with prior art, the beneficial effect had is in the present invention:

The gas permeable brick that the present invention obtains has that anti-pressure ability is strong, long service life, resistant to elevated temperatures advantage, and its compressive strength reaches more than 45Mpa, and one block of gas permeable brick can reuse more than 95 times.

Embodiment

The raw materials of gas permeable brick is: alundum 55Kg, fine and close fused corundom 20 Kg, spinel 10 Kg, magnesia 0.95 Kg, polypropylene fibre 0.05 Kg, chromium trioxide 3 Kg, pure calcium aluminate cement 2 Kg, alumina powder 9 Kg;

Its preparation method comprises the following steps:

A, 55Kg alundum, the fine and close fused corundoms of 20 Kg, 10 Kg spinels, 0.95 Kg magnesia, 0.05 Kg polypropylene fibre, 3 Kg chromium trioxides, 2 Kg pure calcium aluminate cements, 9 Kg alumina powders are carried out preliminary fragmentation respectively after, add ball milling in ball mill to mix, add 30L water again, carrying out being ground to particle diameter is 300 orders, sieve, then will obtain slurry reduction to water content is 6%;

Mould vibratory compaction put into by B, slurry steps A obtained, and then leaves standstill 6h;

C, after step B leaves standstill and terminates, the demoulding, then first at 440 DEG C ~ 450 DEG C dry 2 hours, put it on backing plate with vacuum absorber again, and send in roller way kiln together with described backing plate and fire, firing temperature controls at 1200 DEG C, fires and namely obtains this gas permeable brick in 1 hour.

Claims (1)

1. a preparation method for gas permeable brick, is characterized in that adopting the raw material production by following mass percent: alundum 55%, fine and close fused corundom 20%, spinel 10%, magnesia 0.95%, polypropylene fibre 0.05%, chromium trioxide 3%, pure calcium aluminate cement 2% and alumina powder 9%;

Its preparation method comprises the following steps:

A, the raw material of above-mentioned parts by weight is carried out preliminary fragmentation respectively after, add ball milling in ball mill and mix, then add the water with 30% of raw mixture quality, carrying out being ground to particle diameter is 300 orders, sieves, and then will obtain slurry reduction to water content is 6%;

Mould vibratory compaction put into by B, slurry steps A obtained, and then leaves standstill 6h;

C, after step B leaves standstill and terminates, the demoulding, then first at 440 DEG C ~ 450 DEG C dry 2 hours, put it on backing plate with vacuum absorber again, and send in roller way kiln together with described backing plate and fire, firing temperature controls at 1200 DEG C, fires and namely obtains this gas permeable brick in 1 hour.