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A brick with high thermal shock resistance and low creep for hot blast stove and its manufacturing method

A low-creep, hot-blast stove technology, applied in the field of refractory materials, can solve the problems of short life, unable to meet the long life requirements of large-volume blast furnaces, and achieve the effects of high applicable temperature, good corrosion resistance, and high aluminum content

Active Publication Date: 2021-10-29
SHANDONG VOCATIONAL COLLEGE OF IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, the materials used in hot blast stoves have a short service life under the condition of high blast furnace blast temperature, which cannot meet the long service life requirements of large-volume blast furnace production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) In the wet mill, according to the ratio of raw materials: parts by weight: 23 parts of 3-1mm bauxite, 12.5 parts of 1-0.5mm brown corundum, 10 parts of brown corundum with a particle size of 2 o 3 36.79%, Fe 2 o 3 0.69%, SiO 2 47.39%, TiO 2 0.45%, MgO0.10%, CaO0.24%, Na 2 O0.03%, reduction by ignition 14.10%; the mass percent composition of described 3-1mm andalusite, 0.5-0.1mm andalusite, particle diameter2 o 3 56.58%, Fe 2 o 3 0.74%, TiO 2 0.26%, loss on ignition 0.83%; refractoriness 1790℃. Grinding after mixing evenly:

[0024] 1) According to the ratio of raw materials in the wet mill: parts by weight: 25 parts of 3-1mm bauxite, 15 parts of 1-0.5mm brown corundum, 10 parts of 3-1mm andalusite, 10 parts of 0.5-0.1mm andalusite 16 parts of andalusite with a particle size 2 o 3 36.79%, Fe 2 o 3 0.69%, SiO 2 47.39%, TiO 2 0.45%, MgO0.10%, CaO0.24%, Na 2 O0.03%, burning reduction 14.10%; kneading evenly and then grinding:

[0025] 2) Forming on a f...

Embodiment 2

[0029] 1) According to the ratio of raw materials in the wet mill: the composition by weight is: 22 parts of 3-1mm bauxite, 13 parts of 1-0.5mm brown corundum, 9 parts of brown corundum with a particle size of 2 o 3 37.69%, Fe 2 o 3 0.67%, SiO 2 46.39%, TiO 2 0.47%, MgO0.11%, CaO0.22%, Na 2O0.02%, loss on ignition 14.16%; the mass percentage composition of described 3-1mm andalusite, 0.5-0.1mm andalusite, particle diameter2 o 3 56.58%, Fe 2 o 3 0.74%, TiO 2 0.26%, loss on ignition 0.83%; refractoriness 1790℃. Grinding after mixing evenly:

[0030] 2) Forming on a friction brick press;

[0031] 3) Load the formed green body into the drying kiln car and push it into the tunnel dryer for drying:

[0032] 4) Load the dried body into the kiln car according to the kiln installation diagram, and push it into the tunnel type firing kiln for firing at a firing temperature of 1490°C×9h.

Embodiment 3

[0034] 1) In the wet mill, according to the ratio of raw materials: parts by weight: 24 parts of 3-1mm bauxite, 12 parts of 1-0.5mm brown corundum, 11 parts of brown corundum with a particle size of 2 o 3 36.72%, Fe 2 o 3 0.68%, SiO 2 47.42%, TiO 2 0.43%, MgO0.14%, CaO0.26%, Na 2 O0.04%, loss on ignition 14.08%; the mass percentage composition of described 3-1mm andalusite, 0.5-0.1mm andalusite, particle diameter2 o 3 56.58%, Fe 2 o 3 0.74%, TiO 2 0.26%, loss on ignition 0.83%; refractoriness 1790℃. Grinding after mixing evenly:

[0035] 2) Forming on a friction brick press;

[0036] 3) Load the formed green body into the drying kiln car and push it into the tunnel dryer for drying:

[0037] 4) Load the dried body into the kiln car according to the kiln installation diagram, the firing temperature is 1510℃×9h, and push it into the tunnel type firing kiln for firing.

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Abstract

The invention relates to a brick with high thermal shock resistance and low creep for a hot blast stove and a manufacturing method thereof, belonging to the technical field of refractory materials. It is characterized in that the parts by weight are: 19-27 parts of 3-1mm bauxite, 11-14 parts of 1-0.5mm brown corundum, 8-12 parts of brown corundum with a particle size of <320 mesh, 10-20 parts of 3-1mm andalusite Parts, 9~16 parts of andalusite 0.5‑0.1mm, 14~23 parts of andalusite with particle size<200 mesh, 4.5~7.5 parts of alumina micropowder with particle size<5μm, 5~8 parts of Suzhou soil with particle size<0.045mm, Particle size <240 mesh silicon carbide 4.5~5.5 parts, pulp 3.5~4.5 parts, phosphoric acid 0.2~0.5 parts, dextrin 0.3~0.7 parts, sodium tripolyphosphate 0.1~0.2 parts. The invention introduces silicon carbide and andalusite and brown corundum of specific particle size, on the basis of improving the load softening temperature and high temperature creep performance of fire bricks, the thermal shock resistance stability of the product is improved, and as a refractory material for hot blast stoves, it can Significantly extend its service life.

Description

technical field [0001] The invention relates to a brick with high thermal shock resistance and low creep for a hot blast stove and a manufacturing method thereof, belonging to the technical field of refractory materials. Background technique [0002] The role of the ironmaking blast furnace hot blast stove is to heat the blast to the required temperature to improve the benefit and efficiency of the blast furnace. It works according to the principle of "heat storage". The gas is burned in the combustion chamber, and the high-temperature exhaust gas passes through the checker bricks to store heat. When the checker bricks are fully heated, the hot blast stove can be changed to supply air. At this time, all valves related to combustion are closed, and air supply valves are opened. Checker bricks are heated and sent out. When the blast furnace is equipped with 3-4 hot blast stoves / "single furnace air supply", two or three stoves are used for heating and one for air supply; when ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/66C04B35/622
CPCC04B35/185C04B35/622C04B35/66C04B2235/3217C04B2235/349C04B2235/3826C04B2235/656C04B2235/6567C04B2235/9607C04B2235/9669
Inventor 孙华云
Owner SHANDONG VOCATIONAL COLLEGE OF IND
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