CN1227189A - Method for producing hollow aluminium oxide ball in DC electric arc ore-smelting furnace - Google Patents
Method for producing hollow aluminium oxide ball in DC electric arc ore-smelting furnace Download PDFInfo
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- CN1227189A CN1227189A CN 98123165 CN98123165A CN1227189A CN 1227189 A CN1227189 A CN 1227189A CN 98123165 CN98123165 CN 98123165 CN 98123165 A CN98123165 A CN 98123165A CN 1227189 A CN1227189 A CN 1227189A
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Abstract
Inside one specially-designed DC arc ore-smelting furnace, industrial alumina is first high-temperature smelted at 2200-2300 deg.C and then produced into hollow alumina balls with alumina content greater than 99.0%, main crystal phase of alpha-aluminum oxide, granularity of 0.5-5.0mm and bulk density of 0.5-1.0 g/cu cm through tilt furnace ball blowing with air of 8-10 kg/sq cm pressure. Compared with available method using triphase AC arc ore-smelting furnace, the present invention has 30-50% shortened smelting period, 20-30% lower power consumption and 40-60% reduced graphite electrode bar consumption.
Description
The present invention relates to a kind of production method of alumina hollow ball.Specifically, the present invention relates to a kind of in the DC electric arc ore-smelting furnace that particular design is made fusion commercial alumina and make the method for alumina hollow ball with air blown.
As everyone knows, what prior art was produced the alumina hollow ball employing is the hot stove in three-phase alternating current electric arc ore deposit, it is characterized in that: 1. three root graphite electrode rods are suspended in furnace hearth central authorities, come the heat fused material by electric arc arc light and the electric arc that produces between electrode bar by the ore deposit heat that material produces; 2. during the cold conditions starting the arc, must use the charcoal piece to connect between furnace hearth bottom electrode rod, charcoal piece consumption is generally more than 5kg; 3. owing to be to produce electric arc between electrode bar, three electrode bars move up and down again simultaneously, therefore, want gradation evenly reinforced when reinforced, prevent current interruption; 4. after material all melts,, but be suspended in the feed liquid top, continue to heat feed liquid by arc light because the melt conduction can't be inserted in the feed liquid three electrode bars; 5. because heat mainly concentrates on three electrode bar middle portions, make furnace hearth edge and furnace hearth bottom material be difficult to penetration, cause furnace wall and furnace bottom to hang lining.Therefore, there is following point in the hot stove production in three-phase alternating current electric arc ore deposit alumina hollow ball: 1. carbon content is higher in the feed liquid, makes the alumina hollow ball variable color; 2. arc light is exposed in the air in a large number, forms open arc, causes a large amount of heats to scatter and disappear; 3. smelting time is longer, generally wants at least more than 2 hours; 4. owing to distance between electrode bar is fixing, the current setting scope is restricted; 5. the mass output rate of every stove is lower; 6. the easily oxidation of Graphite Electrodes rod consumes bigger.And, produce alumina hollow ball with DC electric arc ore-smelting furnace by the inventive method, and avoided these shortcomings, be characterized in: 1. anode is fixed on the furnace hearth bottom, and negative electrode is suspended in furnace hearth central authorities, therefore, arc energy passes to the furnace hearth bottom always; 2. end anode is connected with the graphite furnace lining, and promptly whole furnace lining also becomes anode, and therefore, along with the formation of feed liquid, electric arc also passes to the furnace wall always; 3. owing to produce electric arc by positive and negative electrode in whole furnace hearth, the magnetic field that electric arc forms makes feed liquid stir again, and therefore, material melting is more even, and feed liquid is the degassing equably also; 4. since anode fix, and the random up-down adjustment of negative electrode, the regulation range of electric current broadens; 5. because furnace hearth bottom and furnace hearth wall are anode, after the starting the arc is stable, can once material be added, current interruption can not occur, material buries arc light like this, heat is fully used, the thick material bed insulation effect that also plays, the material melting time shortens greatly, simultaneously, speed and degree that electrode bar is oxidized also reduce, and have reduced the consumption of electrode bar.This shows that the present invention adopts DC electric arc ore-smelting furnace to produce alumina hollow ball, solved the hot stove in three-phase alternating current electric arc ore deposit and produced the problems referred to above that alumina hollow ball exists.The result shows, adopts producing hollow aluminium oxide ball in DC electric arc ore-smelting furnace, compares with adopting the hot stove in three-phase alternating current electric arc ore deposit to produce alumina hollow ball, and smelting time shortens 30-50%, power consumption saving 20-30%, the Graphite Electrodes rod consumes and reduces 40-60%.
The purpose of this invention is to provide a kind of, in DC electric arc ore-smelting furnace that particular design make production method of electric smelting manufactured alumina hollow ball of being fit to suitability for industrialized production more more economical, more easy to operate than existing method.
The object of the present invention is achieved like this:
(1) the furnace hearth inner lining material of DC electric arc ore-smelting furnace adopts graphite block, and the graphite block of furnace hearth bottom is connected with end anode.In the furnace hearth through identical with the furnace hearth degree of depth, in the furnace hearth through be negative electrode graphite rod diameter 2-3 doubly.Furnace transformer side voltage-regulation scope is 70-110V, and electric furnace current setting scope is 0-4000A.The air compressor machine air pressure is 10kg/cm
2, nozzle is the flat steel pipe, and diameter of steel tube is 40-50mm, and the jet hole width is 3-7mm, and nozzle is fixed on 70-90mm place, converter nose below, and nozzle and converter nose angle are 60-70 °.
(2) before the blow-on, the Graphite Electrodes rod is reduced to the position of touching with the furnace hearth bottom connection, dose the commercial alumina powder around electrode bar, thickness is 50-100mm, and commercial alumina powder degree should be less than 0.15mm.Connect power supply, striking current is 1000-3500A, treat that the starting the arc is stable after, evenly reinforced, till furnace hearth being filled, the reinforced time is 10-30 minute always.In the 2400-3000A scope, through 30-60 minute melting, material all melted with the electric furnace current stabilization.Then, in the 1500-2400A scope, melting 10-30 minute, when treating that feed temperature reaches 2200-2300 ℃, spray ball immediately inclined with the electric furnace current stabilization.When blowing ball, earlier bell is mentioned, mention electrode again, open the purging valve of air compressor machine.Turndown preferably adopts frequency conversion type, first quick and back slow, is complementary with the feed liquid flow velocity.With the alumina hollow ball that this method is produced, alumina content is greater than 99.0%, and principal crystalline phase is an Alpha-alumina, and granularity is 0.2-5.0mm, and tap density is 0.5-1.0g/cm
3, color is a white.
Illustrate the present invention with embodiment below:
(1) warp and the furnace hearth degree of depth are 400mm in the furnace hearth of DC electric arc ore-smelting furnace, and Graphite Electrodes rod diameter is 150mm, and furnace transformer side voltage is 90V, and the air compressor machine air pressure is 10kg/cm
2, the nozzle diameter of steel tube is 40mm, and the jet hole width is 5mm, and nozzle is fixed on 80mm place, converter nose below, and nozzle and converter nose angle are 65 °.
(2) raw material is the commercial alumina powder, and granularity is less than 0.15mm, and alumina content is 98.0%.With the above-mentioned raw materials 240kg that weighs, it is stand-by to be placed on the stokehold.The Graphite Electrodes rod is reduced to the position of touching with the furnace hearth bottom connection, reinforced 10kg.Connect power supply, striking current is 3000-3500A.After the current stabilization, evenly reinforced, the 240kg material is added always, the reinforced time is about 20 minutes.After raw material adds, mention bell, with the cleaning around electrode bar of stove top periphery material, this moment, the electric furnace current stabilization was in the 2500-2800A scope with plank.Melt after about 40 minutes, material all melts, and feed liquid is constantly emerged around stove upper electrode rod.After this, enter refining period, the electric furnace electric current transfers in the 1800-2000A scope, and melting was mentioned electrode bar after 30 minutes, the ball of turndown spray immediately.Products obtained therefrom is a white, and alumina content is 99.4%, and principal crystalline phase is an Alpha-alumina, and granularity is 0.2-5.0mm, and tap density is 0.65g/m
3
Claims (10)
1. one kind is raw material with the commercial alumina, and melting in DC electric arc ore-smelting furnace is jetted with air, makes the method for alumina hollow ball.It is characterized in that: the hot stove anode in electric arc ore deposit is fixed on the electric furnace bottom, is connected with the furnace hearth liner, and negative electrode is the Graphite Electrodes rod, is suspended in the middle of the furnace hearth, can move up and down.During the starting the arc, contact the starting the arc by positive and negative electrode.After the starting the arc was stable, raw material once added in the stove.After treating that material melts fully, feed liquid is heated to 2200-2300 ℃, turndown blows ball then.
2. according to claim 1, the granularity of commercial alumina powder should be less than 0.15mm, and alumina content is greater than 98.0%.
3. according to claim 1, the liner of DC electric arc ore-smelting furnace is a graphite.
4. according to claim 1, the positive and negative electrode by DC electric arc ore-smelting furnace comes the starting the arc, and striking voltage is 70-110V, and electric current is 1000-3500A.
5. according to claim 1, after the starting the arc, in 10-30 minute, raw material is once added in the stove.
6. according to claim 1, the raw material fusing time is 30-60 minute, and voltage is 70-110V, and electric current is 2400-3000A.
7. according to claim 1, after the raw material fusing, refining time is 10-30 minute, and voltage is 70-110V, and electric current is 1500-2400A.
8. according to claim 1, air pressure is 8-10kg/cm
2
9. according to claim 1, blow the ball nozzle and be fixed on 70-90mm place, converter nose below, nozzle and converter nose angle are 60-70 °.
10. according to claim 1, nozzle is the flat steel pipe, and diameter of steel tube is 40-50mm, and the jet hole width is 3-7mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98123165 CN1227189A (en) | 1998-12-07 | 1998-12-07 | Method for producing hollow aluminium oxide ball in DC electric arc ore-smelting furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98123165 CN1227189A (en) | 1998-12-07 | 1998-12-07 | Method for producing hollow aluminium oxide ball in DC electric arc ore-smelting furnace |
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| CN1227189A true CN1227189A (en) | 1999-09-01 |
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| CN 98123165 Pending CN1227189A (en) | 1998-12-07 | 1998-12-07 | Method for producing hollow aluminium oxide ball in DC electric arc ore-smelting furnace |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337975C (en) * | 2005-10-28 | 2007-09-19 | 浙江大学 | Preparation method of brown corundum bollow ball |
| CN101792317A (en) * | 2010-03-09 | 2010-08-04 | 浙江大学 | Method for producing high-strength alumina hollow spheres |
| CN1884083B (en) * | 2006-07-12 | 2011-02-09 | 华东理工大学 | Process for preparing nano alumina hollow sphere structure |
| CN101268014B (en) * | 2005-09-21 | 2011-06-22 | 研磨剂与耐火品研究与开发中心C.A.R.R.D.有限公司 | Spherical corundum particles, based on fused aluminium oxide and a method for producing said particles |
| CN103058240A (en) * | 2013-01-15 | 2013-04-24 | 雅安百图高新材料有限公司 | Method for preparing spherical alpha-phase alumina |
| CN109773939A (en) * | 2019-01-17 | 2019-05-21 | 山东磊宝锆业科技股份有限公司 | It is the method for raw material blowing polycrystalline flint clay hollow sphere with flint clay |
-
1998
- 1998-12-07 CN CN 98123165 patent/CN1227189A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101268014B (en) * | 2005-09-21 | 2011-06-22 | 研磨剂与耐火品研究与开发中心C.A.R.R.D.有限公司 | Spherical corundum particles, based on fused aluminium oxide and a method for producing said particles |
| CN100337975C (en) * | 2005-10-28 | 2007-09-19 | 浙江大学 | Preparation method of brown corundum bollow ball |
| CN1884083B (en) * | 2006-07-12 | 2011-02-09 | 华东理工大学 | Process for preparing nano alumina hollow sphere structure |
| CN101792317A (en) * | 2010-03-09 | 2010-08-04 | 浙江大学 | Method for producing high-strength alumina hollow spheres |
| CN101792317B (en) * | 2010-03-09 | 2012-12-19 | 浙江大学 | Method for producing high-strength alumina hollow spheres |
| CN103058240A (en) * | 2013-01-15 | 2013-04-24 | 雅安百图高新材料有限公司 | Method for preparing spherical alpha-phase alumina |
| CN109773939A (en) * | 2019-01-17 | 2019-05-21 | 山东磊宝锆业科技股份有限公司 | It is the method for raw material blowing polycrystalline flint clay hollow sphere with flint clay |
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