CN103755362B - Coating for oxygen lance of nonferrous smelting furnace - Google Patents

Coating for oxygen lance of nonferrous smelting furnace Download PDF

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Publication number
CN103755362B
CN103755362B CN201310720153.9A CN201310720153A CN103755362B CN 103755362 B CN103755362 B CN 103755362B CN 201310720153 A CN201310720153 A CN 201310720153A CN 103755362 B CN103755362 B CN 103755362B
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granularity
oxygen lance
percent
weight percentage
coating
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CN103755362A (en
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刘昭
徐琳琳
叶亚红
徐如林
郭学亮
周珍妮
刘虎保
刘锡俊
翟建伟
胡世平
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HENAN RUITAI REFRACTORY TECHNOLOGY Co Ltd
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HENAN RUITAI REFRACTORY TECHNOLOGY Co Ltd
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Abstract

The invention discloses a coating for an oxygen lance of a nonferrous smelting furnace. The coating for the oxygen lance of the nonferrous smelting furnace consists of the following raw materials in percentage by weight: 5 to 15 percent of 3 to 5mm waste alumina-chrome bricks, 5 to 15 percent of 1 to 3mm waste alumina-chrome bricks, 5 to 15 percent of 3 to 5mm tabular corundum, 5 to 15 percent of 1 to 3mm tabular corundum, 40 to 50 percent of tabular corundum of less than 0.088mm, 8 to 15 percent of chromium oxide green of less than 0.044mm, 3 to 8 percent of pure calcium aluminate cement, 2.5 to 5 percent of alpha-Al2O3 micropowder of less than 0.044mm and 8 to 10 percent of bonding agent. The coating is small in thermal expansion coefficient difference and high in erosion scouring resistance and thermal shock stability, and the current situations of high oxidation rate and high erosion speed of the oxygen lance can be remarkably improved, so that the service life of the oxygen lance is greatly prolonged, and the comprehensive cost of the oxygen lance is lowered.

Description

A kind of non-ferrous smelting furnace oxygen lance coating
Technical field
The invention belongs to inorganic non-metallic fire resisting material field, be specifically related to a kind of non-ferrous smelting furnace oxygen lance coating.
Background technology
Oxygen lance is widely used in steelmaking oxygen blowing prepurging, steel teeming ladle oxygen blast open water, iron-smelting blast furnace oxygen blast opens the fields such as iron notch, for extending the life-span of oxygen lance, international and domestic common practice is that the appearance of common oxygen blow steel pipe is coated refractory substance, reaches the object reducing labour intensity and reduce loss per ton steel.But this coating majority adopts silicate or magnesium oxide class material, can play a role with the oxygen lance after these matter coatings, but the problem of ubiquity three aspect: all need low-temperature bake after the first is shaping, both cost was high, extended fabrication cycle again; It two is that under high temperature, the thermal expansivity of coating is not mated with metal, intensity and wear resistance inadequate, cause work-ing life short; It three is that oxygen lance all needs the process such as rust cleaning before coating, wastes time and energy.
At present, the oxygen lance used of the reverberatory furnace in nonferrous industry work-ing life is short is the difficult problem perplexing each nonferrous smelting producer.Domestic nonferrous smelting producer clays into power with after rear high alumina brick fragmentation, then adds after water glass is in harmonious proportion and smear, though the life-span of oxygen lance can be made to obtain prolongation to a certain extent, but still undesirable.Therefore develop a kind of anti-molten non-ferrous metal and slag corrosion strong, the coating that Spalling resistance is strong is particularly important.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of non-ferrous smelting furnace oxygen lance coating.Product coating thermal expansivity gap of the present invention is little, anti-erosion erosion and good thermal shock stability, can obviously improve oxygen lance oxidizable, invade and damage fast present situation; Thus increased substantially the life-span of oxygen lance, reduce the comprehensive cost of oxygen lance.And there is stronger avidity with steel pipe or iron pipe, reduce the labour intensity of operator, improve the running efficiency of kiln.
In order to solve the problem, the technical solution used in the present invention is:
The invention provides a kind of non-ferrous smelting furnace oxygen lance coating, represent with weight percentage, the raw material of described non-ferrous smelting furnace oxygen lance coating consists of:
The aluminium scrap chrome brick particle 5 ~ 15% of 3 ~ 5mm granularity, the aluminium scrap chrome brick particle 5 ~ 15% of 1 ~ 3mm granularity, the plate diamond spar 5 ~ 15% of 3 ~ 5mm granularity, the plate diamond spar 5 ~ 15% of 1 ~ 3mm granularity, be less than the plate diamond spar 40 ~ 50% of 0.088mm granularity, be less than the chromoxide green 8 ~ 15% of 0.044mm granularity, pure calcium aluminate cement 3 ~ 8% and the α-Al being less than 0.044mm granularity 2o 3micro mist 2.5 ~ 5%; The additional bonding agent accounting for above-mentioned various raw material gross weight 8 ~ 10%.
According to above-mentioned non-ferrous smelting furnace oxygen lance coating, in described aluminium scrap chrome brick, the weight percentage of main chemical compositions is Al 2o 3> 78%, Cr 2o 3> 78%; The compressive strength > 70MPa of aluminium scrap chrome brick.
According to above-mentioned non-ferrous smelting furnace oxygen lance coating, described bonding agent is the mixture of aluminium dihydrogen phosphate or Sodium hexametaphosphate 99 or aluminium dihydrogen phosphate and Sodium hexametaphosphate 99.
According to above-mentioned non-ferrous smelting furnace oxygen lance coating, Al in described plate diamond spar 2o 3weight percentage>=99%; Cr in described chromoxide green 2o 3weight percentage>=98.5%; Described pure calcium aluminate cement is CA-70 pure calcium aluminate cement; Described α-Al 2o 3al in micro mist 2o 3weight percentage>=99%.
The aluminium scrap chrome brick particle that the present invention adopts is that the residual brick of the rear aluminium chromium of non-ferrous smelting furnace is obtained after selection, process, fragmentation, screening.Under the prerequisite ensureing result of use, realize the recycling of resource as much as possible.
positive beneficial effect of the present invention:
1, non-ferrous smelting furnace oxygen lance coating thermal expansivity gap of the present invention is little, anti-erosion erosion and good thermal shock stability, can obviously improve oxygen lance oxidizable, invade and damage fast present situation; Thus increased substantially the life-span of oxygen lance, reduce the comprehensive cost of oxygen lance.And there is stronger avidity with steel pipe or iron pipe, reduce the labour intensity of operator, improve the running efficiency of kiln.
2, the ultra-fine chromoxide green powder that the present invention adopts has very high reactive behavior, contributes to forming aluminium picotite in goods.And there is good fillibility, make goods of the present invention have less void content, increase resistance to slag corrosion.Aluminium chromium matrix then ensure that the slag of nonferrous smelting is in the process to coating internal penetration, the FeO in slag and the Cr in matrix 2o 3, Al 2o 3reaction generates dystectic FeOCr 2o 3and FeOAl 2o 3, inhibit the further infiltration of slag, thus improve the resistance to slag corrosion of material, extend the work-ing life of furnace lining.
3, the present invention can make material have higher normal temperature strength after adopting the abundant maintenance of CA-70 pure calcium aluminate cement to harden, and in use, material sinters, and produces Ceramic bond, ensure that the working strength under hot environment.
4, the present invention adopts α-Al 2o 3micro mist has higher activity, can reduce material sintering reaction temperature in use, expands the temperature use range of material.
5, the present invention adopts the combined binder of aluminium dihydrogen phosphate and Sodium hexametaphosphate 99, not only can significantly improve the intensity of product of the present invention, thus makes it have excellent wear resisting property and cold crushing strength; And there is higher load softening point.In addition, this combined binder can also improve the avidity on product of the present invention and oxygen lance surface, in the process of construction, reduce labor strength.
6, non-ferrous smelting furnace oxygen lance coating of the present invention adopts plate diamond spar and chromoxide green to be main raw material, and adds a certain amount of aluminium scrap chrome brick particle as aggregate, adds pure calcium aluminate cement, α-Al 2o 3micro mist, using aluminium dihydrogen phosphate and Sodium hexametaphosphate 99 as combined binder.Product coating of the present invention and steel pipe or iron pipe have stronger avidity, and thermal expansivity gap is little, anti-erosion erosion and good thermal shock stability; Significantly improve oxygen lance oxidizable, invade and damage fast present situation, increased substantially the life-span of oxygen lance, reduced the comprehensive cost of oxygen lance, improve the running efficiency of kiln.
embodiment:
Set forth the present invention further below in conjunction with embodiment, but do not limit content of the present invention.
Embodiment 1:
Non-ferrous smelting furnace oxygen lance coating of the present invention, represent with weight percentage, its raw material consists of:
The aluminium scrap chrome brick particle of 3 ~ 5mm granularity: 5%,
The aluminium scrap chrome brick particle of 1 ~ 3mm granularity: 5%,
The plate diamond spar of 3 ~ 5mm granularity: 15%,
The plate diamond spar of 1 ~ 3mm granularity: 15%,
Be less than the plate diamond spar of 0.088mm granularity: 40%,
Be less than the chromoxide green of 0.044mm granularity: 10%,
CA-70 pure calcium aluminate cement: 5%,
Be less than the α-Al of 0.044mm granularity 2o 3micro mist: 5%;
The additional combined binder accounting for above-mentioned various raw material gross weight 10%, combined binder is the mixture of aluminium dihydrogen phosphate and Sodium hexametaphosphate 99.
In the aluminium scrap chrome brick that the present embodiment adopts, the weight percentage of main chemical compositions is Al 2o 3> 78%, Cr 2o 3> 78%; The compressive strength > 70MPa of aluminium scrap chrome brick.Al in plate diamond spar 2o 3weight percentage>=99%; Cr in described chromoxide green 2o 3weight percentage>=98.5%; Described α-Al 2o 3al in micro mist 2o 3weight percentage>=99%.
Embodiment 2:
Non-ferrous smelting furnace oxygen lance coating of the present invention, represent with weight percentage, its raw material consists of:
The aluminium scrap chrome brick particle of 3 ~ 5mm granularity: 10%,
The aluminium scrap chrome brick particle of 1 ~ 3mm granularity: 10%,
The plate diamond spar of 3 ~ 5mm granularity: 10%,
The plate diamond spar of 1 ~ 3mm granularity: 10%,
Be less than the plate diamond spar of 0.088mm granularity: 40%,
Be less than the chromoxide green of 0.044mm granularity: 10%,
CA-70 pure calcium aluminate cement: 5%,
Be less than the α-Al of 0.044mm granularity 2o 3micro mist: 5%;
The additional combined binder accounting for above-mentioned various raw material gross weight 10%, combined binder is the mixture of aluminium dihydrogen phosphate and Sodium hexametaphosphate 99.
In the aluminium scrap chrome brick that the present embodiment adopts, the weight percentage of main chemical compositions is Al 2o 3> 78%, Cr 2o 3> 78%; The compressive strength > 70MPa of aluminium scrap chrome brick.Al in plate diamond spar 2o 3weight percentage>=99%; Cr in described chromoxide green 2o 3weight percentage>=98.5%; Described α-Al 2o 3al in micro mist 2o 3weight percentage>=99%.
Embodiment 3:
Non-ferrous smelting furnace oxygen lance coating of the present invention, represent with weight percentage, its raw material consists of:
The aluminium scrap chrome brick particle of 3 ~ 5mm granularity: 10%,
The aluminium scrap chrome brick particle of 1 ~ 3mm granularity: 5%,
The plate diamond spar of 3 ~ 5mm granularity: 5%,
The plate diamond spar of 1 ~ 3mm granularity: 10%,
Be less than the plate diamond spar of 0.088mm granularity: 50%,
Be less than the chromoxide green of 0.044mm granularity: 12.5%,
CA-70 pure calcium aluminate cement: 5%,
Be less than the α-Al of 0.044mm granularity 2o 3micro mist: 2.5%;
The additional biphosphate Al binding agent accounting for above-mentioned various raw material gross weight 8%.
In the aluminium scrap chrome brick that the present embodiment adopts, the weight percentage of main chemical compositions is Al 2o 3> 78%, Cr 2o 3> 78%; The compressive strength > 70MPa of aluminium scrap chrome brick.Al in plate diamond spar 2o 3weight percentage>=99%; Cr in described chromoxide green 2o 3weight percentage>=98.5%; Described α-Al 2o 3al in micro mist 2o 3weight percentage>=99%.
Embodiment 4:
Non-ferrous smelting furnace oxygen lance coating of the present invention, represent with weight percentage, its raw material consists of:
The aluminium scrap chrome brick particle of 3 ~ 5mm granularity: 11%,
The aluminium scrap chrome brick particle of 1 ~ 3mm granularity: 5%,
The plate diamond spar of 3 ~ 5mm granularity: 5%,
The plate diamond spar of 1 ~ 3mm granularity: 8%,
Be less than the plate diamond spar of 0.088mm granularity: 50%,
Be less than the chromoxide green of 0.044mm granularity: 8%,
CA-70 pure calcium aluminate cement: 8%,
Be less than the α-Al of 0.044mm granularity 2o 3micro mist: 5%;
The additional Sodium hexametaphosphate 99 bonding agent accounting for above-mentioned various raw material gross weight 10%.
In the aluminium scrap chrome brick that the present embodiment adopts, the weight percentage of main chemical compositions is Al 2o 3> 78%, Cr 2o 3> 78%; The compressive strength > 70MPa of aluminium scrap chrome brick.Al in plate diamond spar 2o 3weight percentage>=99%; Cr in described chromoxide green 2o 3weight percentage>=98.5%; Described α-Al 2o 3al in micro mist 2o 3weight percentage>=99%.
Embodiment 5:
Non-ferrous smelting furnace oxygen lance coating of the present invention, represent with weight percentage, its raw material consists of:
The aluminium scrap chrome brick particle of 3 ~ 5mm granularity: 15%,
The aluminium scrap chrome brick particle of 1 ~ 3mm granularity: 5%,
The plate diamond spar of 3 ~ 5mm granularity: 5%,
The plate diamond spar of 1 ~ 3mm granularity: 15%,
Be less than the plate diamond spar of 0.088mm granularity: 42%,
Be less than the chromoxide green of 0.044mm granularity: 11%,
CA-70 pure calcium aluminate cement: 3%,
Be less than the α-Al of 0.044mm granularity 2o 3micro mist: 4%;
The additional combined binder accounting for above-mentioned various raw material gross weight 9%, combined binder is the mixture of aluminium dihydrogen phosphate and Sodium hexametaphosphate 99.
In the aluminium scrap chrome brick that the present embodiment adopts, the weight percentage of main chemical compositions is Al 2o 3> 78%, Cr 2o 3> 78%; The compressive strength > 70MPa of aluminium scrap chrome brick.Al in plate diamond spar 2o 3weight percentage>=99%; Cr in described chromoxide green 2o 3weight percentage>=98.5%; Described α-Al 2o 3al in micro mist 2o 3weight percentage>=99%.
Embodiment 6:
Non-ferrous smelting furnace oxygen lance coating of the present invention, represent with weight percentage, its raw material consists of:
The aluminium scrap chrome brick particle of 3 ~ 5mm granularity: 5%,
The aluminium scrap chrome brick particle of 1 ~ 3mm granularity: 15%,
The plate diamond spar of 3 ~ 5mm granularity: 12%,
The plate diamond spar of 1 ~ 3mm granularity: 5%,
Be less than the plate diamond spar of 0.088mm granularity: 41%,
Be less than the chromoxide green of 0.044mm granularity: 15%,
CA-70 pure calcium aluminate cement: 4%,
Be less than the α-Al of 0.044mm granularity 2o 3micro mist: 3%;
The additional combined binder accounting for above-mentioned various raw material gross weight 10%, combined binder is the mixture of aluminium dihydrogen phosphate and Sodium hexametaphosphate 99.
In the aluminium scrap chrome brick that the present embodiment adopts, the weight percentage of main chemical compositions is Al 2o 3> 78%, Cr 2o 3> 78%; The compressive strength > 70MPa of aluminium scrap chrome brick.Al in plate diamond spar 2o 3weight percentage>=99%; Cr in described chromoxide green 2o 3weight percentage>=98.5%; Described α-Al 2o 3al in micro mist 2o 3weight percentage>=99%.
Embodiment 7:
Non-ferrous smelting furnace oxygen lance coating of the present invention, represent with weight percentage, its raw material consists of:
The aluminium scrap chrome brick particle of 3 ~ 5mm granularity: 10%,
The aluminium scrap chrome brick particle of 1 ~ 3mm granularity: 5%,
The plate diamond spar of 3 ~ 5mm granularity: 5%,
The plate diamond spar of 1 ~ 3mm granularity: 10%,
Be less than the plate diamond spar of 0.088mm granularity: 45%,
Be less than the chromoxide green of 0.044mm granularity: 15%,
CA-70 pure calcium aluminate cement: 5%,
Be less than the α-Al of 0.044mm granularity 2o 3micro mist: 5%;
The additional combined binder accounting for above-mentioned various raw material gross weight 10%, combined binder is the mixture of aluminium dihydrogen phosphate and Sodium hexametaphosphate 99.
In the aluminium scrap chrome brick that the present embodiment adopts, the weight percentage of main chemical compositions is Al 2o 3> 78%, Cr 2o 3> 78%; The compressive strength > 70MPa of aluminium scrap chrome brick.Al in plate diamond spar 2o 3weight percentage>=99%; Cr in described chromoxide green 2o 3weight percentage>=98.5%; Described α-Al 2o 3al in micro mist 2o 3weight percentage>=99%.
The performance test of product coating of the present invention:
The embodiment of the present invention 1 ~ 7 product is conventionally carried out formed at normal temp, detects, concrete test result is as shown in table 1.
Through testing and facts have proved, non-ferrous smelting furnace oxygen lance coating tack of the present invention is strong, and anti-erosion erosion and good thermal shock stability, make the oxygen lance life-span significantly improve, reduce the comprehensive cost of oxygen lance and the labour intensity of operator, improve the running efficiency of kiln.

Claims (2)

1. a non-ferrous smelting furnace oxygen lance coating, is characterized in that, represents with weight percentage, and the raw material of described non-ferrous smelting furnace oxygen lance coating consists of:
The aluminium scrap chrome brick particle 5 ~ 15% of 3 ~ 5mm granularity, the aluminium scrap chrome brick particle 5 ~ 15% of 1 ~ 3mm granularity, the plate diamond spar 5 ~ 15% of 3 ~ 5mm granularity, the plate diamond spar 5 ~ 15% of 1 ~ 3mm granularity, be less than the plate diamond spar 40 ~ 50% of 0.088mm granularity, be less than the chromoxide green 8 ~ 15% of 0.044mm granularity, pure calcium aluminate cement 3 ~ 8% and the α-Al being less than 0.044mm granularity 2o 3micro mist 2.5 ~ 5%; The additional bonding agent accounting for above-mentioned various raw material gross weight 8 ~ 10%;
The compressive strength > 70MPa of described aluminium scrap chrome brick; Described bonding agent is the mixture of aluminium dihydrogen phosphate or Sodium hexametaphosphate 99 or aluminium dihydrogen phosphate and Sodium hexametaphosphate 99.
2. non-ferrous smelting furnace oxygen lance coating according to claim 1, is characterized in that: Al in described plate diamond spar 2o 3weight percentage>=99%; Cr in described chromoxide green 2o 3weight percentage>=98.5%; Described pure calcium aluminate cement is CA-70 pure calcium aluminate cement; Described α-Al 2o 3al in micro mist 2o 3weight percentage>=99%.
CN201310720153.9A 2013-12-24 2013-12-24 Coating for oxygen lance of nonferrous smelting furnace Active CN103755362B (en)

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CN104310975A (en) * 2014-10-21 2015-01-28 吴国庆 Aluminum oxide vent plug and preparation method thereof

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* Cited by examiner, † Cited by third party
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CN1120527A (en) * 1995-05-30 1996-04-17 肖凤岐 Refractory oxygen blow-pipe and its prodn. technique
CN1204630A (en) * 1997-07-02 1999-01-13 彭涛 Coating material for fireproof oxygen lance
CN1117044C (en) * 2000-03-27 2003-08-06 赵文厚 Refractory Cr-Al material
CN1513802A (en) * 2002-07-08 2004-07-21 赵文厚 Aluminium chromium guality refractory material and its production method
CN1216157C (en) * 2003-11-03 2005-08-24 高中贵 Oxygen core lance having high temperature coating
CN102134164B (en) * 2010-01-21 2013-04-17 宜兴市国强炉业有限公司 High-temperature wear-resistant repairing coating and preparation method thereof
CN103360094B (en) * 2013-07-29 2014-11-12 莱芜钢铁集团泰东实业有限公司 Fireproof oxygen blowing tube coating

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Denomination of invention: A kind of coating material for oxygen blowing pipe of nonferrous smelting furnace

Effective date of registration: 20210707

Granted publication date: 20150506

Pledgee: SHANGHAI PUDONG DEVELOPMENT BANK Co.,Ltd. ZHENGZHOU BRANCH

Pledgor: HENAN RUITAI FIREPROOF MATERIAL TECHNOLOGY Co.,Ltd.

Registration number: Y2021980005844