Fire resistive material for coke oven door

A refractory material and furnace door technology, which is applied to the door/closure of coke oven, coke oven, heating of coke oven, etc., can solve the problems of single ratio, increase material cost, slow strength formation, etc. The effect of excellent performance, excellent cost performance and excellent thermal insulation performance

Active Publication Date: 2008-03-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patented technology does not introduce any technical performance indicators of the finished product, and the ratio is also a single ratio: mullite 51%, cordierite 35%, alumina cement 7% (Al 2 o 3 >75%), alumina micropowder 3%, silica micropowder 4%
And in this patent, calcium aluminate cement with high alumina content is used. It has good performance when used at high temperature of 1400 ° C, but its strength is not high at low and medium temperatures. ℃) There is not much advantage, the strength is formed slowly during construction, and the material cost is increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] As shown in table 1, the proportioning of embodiment 1 is as follows:

[0042] Mullite: 63wt%; mullite is added in three particle sizes: 8-3mm; 3-0mm; 0.088-0mm, among which: 8-3mm particle size is 30wt%; 0mm particle size is 23 wt%.

[0043] Cordierite: 20%, the particle size is 3-0mm;

[0044] High alumina cement: 5%, the particle size is 0.088~0mm;

[0045] Silica powder: 5%, particle size less than 0.5 microns;

[0046] Activated alumina micropowder: 4%, particle size less than 5.0 microns;

[0047] Kyanite: 3%, particle size between 0.045 ~ 0mm;

[0048] In addition, 0.1% of sodium tripolyphosphate and 0.1% of sodium hexametaphosphate were added. Add 7% water to the above components, pour into a standard sample to test the physical properties, and its technical indicators are shown in Table 2, where: 110°C×24h means that the sample has passed the heat treatment process of drying at 110°C for 24 hours; 1100℃×3h means that the sample has passed the heat treatme...

Embodiment 2

[0051] As shown in table 1, the proportioning of embodiment 2 is as follows (unit wt%):

[0052] Mullite: 52%; of which: 25% for 8-3mm particle size; 10% for 3-0mm particle size; 17% for 0.088-0mm particle size.

[0053] Cordierite: 25%, the particle size is 3-0mm;

[0054] High alumina cement: 4%, the particle size is 0.088~0mm;

[0055] Silica powder: 8%, particle size less than 0.5 microns;

[0056] Activated alumina micropowder: 6%, particle size less than 5.0 microns;

[0057] Kyanite: 5%, particle size between 0.045 ~ 0mm;

[0058] In addition, 0.15% sodium tripolyphosphate and 0.15% sodium hexametaphosphate were added.

[0059] Add 8% water to the above components. The test conditions are the same as in Example 1.

[0060] The bulk density, compressive strength and linear change rate of Example 2 are shown in Table 2. After thermal shock cycle test under 1100℃~water cooling condition, after more than 80 thermal shock cycle tests, the material is not damaged, show...

Embodiment 3

[0062] As shown in table 1, the proportioning of embodiment 3 is as follows (unit wt%):

[0063] Mullite: 42%; of which: 20% for 8-3mm particle size; 10% for 3-0mm particle size; 12% for 0.088-0mm particle size.

[0064] Cordierite: 30%, the particle size is 3-0mm;

[0065] High alumina cement: 3%, the particle size is 0.088~0mm;

[0066] Silica powder: 10%, the particle size is less than 0.5 microns;

[0067] Activated alumina micropowder: 8%, particle size less than 5.0 microns;

[0068] Kyanite: 7%, particle size between 0.045 ~ 0mm;

[0069] In addition, 0.25% sodium tripolyphosphate and 0.25% sodium hexametaphosphate were added.

[0070] Add water 9% to the above components. Test condition is the same as embodiment 1 and 2.

[0071] The bulk density, compressive strength and linear change rate of Example 3 are shown in Table 2. After thermal shock cycle test under 1100℃~water cooling condition, after more than 80 thermal shock cycle tests, the material is not damag...

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Abstract

The refractory material for coke oven door consists of mullite 42-63 wt%, cordierite 20-30 wt%, micro silica powder 5-10 wt%, micro active alumina powder 4-8 wt%, kyanite 3-7 wt%, high alumina cement 3-5 wt%, and composite polyphosphate 0.2-0.5 wt%. The mullite is M60 mullite containing Al2O3 not less than 60 wt%, the cordierite contains Al2O3 33-35 wt% and MgO 13-15 wt%, the micro silica powder contains SiO2 not less than 92 wt%, the micro active alumina powder contains Al2O3 more than 98 wt%, the high alumina cement contains Al2O3 not less than 46 wt%, CaO not more than 40 wt% and SiO2 not more than 10 wt%. The refractory material may be produced into coke oven door through low temperature roasting without need of backing, and the coke oven door has service life over 4 years.

Description

technical field [0001] The invention relates to a refractory material, in particular to a refractory material for a coke oven door. Background technique [0002] The coke oven is the main equipment of coking, and its purpose is to carry out dry distillation of coking coal in the carbonization chamber to obtain coke and other by-products. During the use of the coke oven, due to the temperature stress, mechanical stress and chemical corrosion caused by repeated operations such as coal charging, door removal, and coke pushing, the furnace door material is often damaged. [0003] The existing domestic coke oven door materials are generally clay bricks, cordierite bricks, poly light insulation bricks, and hollow floating bead bricks. However, the thermal shock stability of clay bricks, poly light-weight bricks, and hollow pearl bricks is average; although the thermal insulation performance of poly light-weight bricks and hollow pearl bricks is good, the apparent porosity is too ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/18C04B35/185C10B25/02C10B29/02
Inventor 甘菲芳程乐意徐志栋金宝田守信邰力陶卫民马寅元
Owner BAOSHAN IRON & STEEL CO LTD
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