CN100392112C - Slag making recarburized ball and its production method - Google Patents
Slag making recarburized ball and its production method Download PDFInfo
- Publication number
- CN100392112C CN100392112C CNB2005101336881A CN200510133688A CN100392112C CN 100392112 C CN100392112 C CN 100392112C CN B2005101336881 A CNB2005101336881 A CN B2005101336881A CN 200510133688 A CN200510133688 A CN 200510133688A CN 100392112 C CN100392112 C CN 100392112C
- Authority
- CN
- China
- Prior art keywords
- ball
- coal
- slag
- granularity
- broken
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The present invention relates to a foamed slag forming agent for the steel making of an electric-arc furnace, particularly to a slag forming recarburizing ball and a production method thereof. The present invention is characterized in that the slag forming recarburizing ball is mixture which is composed of components with the percentages by weight: 95 to 96% of coal of which activity degree is bigger than or equal to 68%, 1.5 to 2% of industry starch, 0.8 to 1% of sodium hydroxide and 1 to 2% of water. The production method comprises the production procedures of primary pulverization, fine pulverization, once pugging, secondary pugging, sand loosening, extrusion molding, drying and screen sieving. The present invention has the advantages that the slag forming recarburizing ball has high specific gravity, highly pressure resistance intensity and high carbon content; the slag forming recarburizing ball can directly enter furnace cinder layers to quickly reacts with oxygen and form foamed slag in the steel making process, furnace temperature can be maintained to accelerate smelting, and energy consumption is reduced; furnace walls can be prevented from being eroded by electric arcs, nitrogen in molten steel is prevented from being sucked, and coal consumption is reduced; meanwhile, the function of carbon supplement is performed during the smelting of high carbon steel, and the molten steel is avoided from peroxidation. In addition, the production technique of the slag forming recarburizing ball is simple and easy to popularize and has obvious social and economic benefit.
Description
Technical field
The present invention relates to a kind of electric-arc furnace steelmaking foamy slag slag former, relate in particular to a kind of slag making recarburized ball and manufacture method thereof.
Background technology
In the electric-arc furnace steelmaking slagging process, at present, generally use foamy slag technology, foamy slag is to burn to generate carbon monoxide and carbon dioxide and be packed in the slag that swims in the top layer in oxygen by carbon to form.In with the steel scrap steelmaking process, the huge heat energy that the foam slag blanket generates electric arc remains on steel scrap and molten steel inside, play insulation effect and quickened smelting process, simultaneously, electric arc and furnace wall isolation can be prevented the arc erosion furnace wall, in addition, the quality that can also stop the suction raising steel that contacting of molten steel and furnace air reduced nitrogen, thereby make electric-arc furnace steelmaking obtain better metallurgical effect, thereby having made foamy slag is an important link in arc furnace smelting procedure.Realize that making foamed slag can have multiple mode, adopt the carbon-oxygen gun mechanical manipulator can obtain better effects, but cost an arm and a leg the cost height.At present, the making foam slag technology that steelworks generally uses be by from be arranged on fire door blow the carbon rifle and oxygen-blowing gun is blown into coal dust and oxygen carries out, yet, owing to tension force is arranged on the slag surface, and its granularity of coal dust that slag former adopts is very light less than 3mm, is again negative-pressure operation in the stove, thereby be blown at coal dust and have 30% coal dust to be aspirated in the process approximately by the dedusting hole, rest parts just drops on the top of the slag, and the loss of fire door breeze blowing is big, is difficult to be blown in the slag blanket, cause the foaming difficulty, untimely, thereby make the naked leakage overlong time of electrode arc light, like this, just cause erosion easily electric stove wall, thermal energy dissipation, power consumption is too high, simultaneously, can not block molten steel because of foamy slag is bad and contact with air, the molten steel nitrogen content is improved, influenced the quality of steel; In addition, in high carbon steel is smelted, have at present that to smelt the latter stage decarbonization rate fast, the Molten Steel over-oxidation problem has influenced the carbon content of steel, causes degradation.
Summary of the invention
Main purpose of the present invention is: at the problems referred to above, a kind of high specific gravity is provided, high resistance to compression, the foamy slag slag former and the manufacture method thereof of high carbon content, using this slag former in steelmaking process can directly enter slag layer and form the foam slag blanket fast by the reaction with oxygen and play and keep furnace temperature to quicken smelting process, energy-saving and cost-reducing effect, reduced the consumption of coal amount simultaneously, also prevent the arc erosion furnace wall, prolong the electric arc furnace life-span, prevent that the suction of nitrogen in the molten steel from improving the quality of steel, in addition, when the smelting high carbon steel grade, benefit carbon means are provided as carburelant.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of slag making recarburized ball is characterized in that it is to be mixed with mixture by weight percentage by following raw materials according, wherein: and the coal 95-96% of activity degree 〉=68%,
Industrial starch 1.5-2%,
Sodium hydroxide 0.8-1%,
Water 1-2%.
A kind of manufacture method of above-mentioned slag making recarburized ball is characterized in that comprising the steps:
(1) just broken: as the coal of activity degree 〉=68% to be broken into the broken coal piece that granularity is 10mm with pulverizer;
(2) in small, broken bits: is that the broken coal piece of 10mm further is broken into the coal particle that granularity is 0-2mm with pulverizer with granularity;
(3) once mixed pinching: be the coal particle of 0-2mm at first with activity degree 〉=68%, granularity, industrial starch, sodium hydroxide and water are according to the per-cent batching of following weight, wherein: coal particle 95-96%, industrial starch 1.5-2%, sodium hydroxide 0.8-1%, temperature is 30-40 ℃ water 1-2%, batching is placed stirrer, fully stirred 5-6 minute, mix;
(4) secondary mixing is pinched: once mix on the basis of pinching in step (3), the compound that forms is inserted in the sand mill roll, continue 5-6 minute, making industrial starch and sodium hydroxide coated equably is the coal particle surface of 0-2mm in granularity;
(5) fluffing of moulding sand: will shelve 1-2 minute through the compound that step (4) secondary mixing is pinched, and make its further ripe homogenizing of row;
(6) extrusion molding: will be the ball of granularity 50-60mm with the extrusion machine extrusion molding through the ripe uniform compound of step (5) row;
(7) oven dry: the slag making recarburized ball after the moulding is put into stoving oven, and oven dry is 2 hours in temperature 130-160 ℃ environment;
(8) screening: remove disintegrating slag.
Advantage of the present invention is: provide a kind of have high specific gravity, high compressive strength, foamy slag slag former-the slag making recarburized ball and the manufacture method thereof of high carbon content, slag making recarburized ball can directly enter slag layer inside in steelmaking process, form foamy slag fast by reaction and can play barrier function with oxygen, prevent that molten steel from contacting with air, can keep furnace temperature, quicken smelting process, energy-saving and cost-reducing; Can prevent the arc erosion furnace wall again, prolong the electric arc furnace life-span; And prevent that the suction of nitrogen in the molten steel from improving the quality of steel; Compare with the coal dust slag making and to have reduced the consumption of coal amount; When the smelting high carbon steel grade, provide benefit carbon means as carburelant simultaneously, avoided Molten Steel over-oxidation, and the slag making recarburized ball manufacturing process has been simple, be easy to promote, economic results in society are obvious.
Below in conjunction with embodiment to the detailed description of the invention.
Embodiment
Embodiment 1
1) raw material sources
The raw material of slag making recarburized ball is the commercially available prod, and the coal buying of activity degree 〉=68% is from the gasification of coal of Shuozhou, Shanxi Coal Production, and sodium hydroxide is the sodium hydroxide of industrial 95% purity of chemical plant, Dagu production, and industrial starch can directly be buied by market.
2) each component content in the slag making recarburized ball batching is counted by weight,
As shown in table 1: the coal 95 of activity degree 〉=68%, sodium hydroxide 1, industrial starch 2, water 2; Here the activity degree of coal is the index of expression coal evolving gas ability in combustion processes, and activity degree is high more, and escaping gas is many more.
3) manufacturing step is as follows:
(1) just broken: as the coal of activity degree 〉=68% to be broken into the broken coal piece that granularity is 10mm with pulverizer; (2) in small, broken bits: is that the broken coal piece of 10mm further is broken into the coal particle that granularity is 0-2mm with pulverizer with granularity; (3) once mixed pinching: the coal particle, industrial starch, sodium hydroxide and the water that at first with granularity are 0-2mm are according to each component concentration batching shown in the table 1, and wherein the temperature of water is 40 ℃, and batching is placed stirrer, fully stirs 5-6 minute, mixes; (4) secondary mixing is pinched: once mix on the basis of pinching in step (3), the compound that forms is inserted in the sand mill roll, continue 5-6 minute, making industrial starch and sodium hydroxide coated equably is the coal particle surface of 0-2mm in granularity; (5) fluffing of moulding sand: will shelve 1-2 minute through the compound that step (4) secondary mixing is pinched, and make its further ripe homogenizing of row; (6) extrusion molding: will be the ball of granularity 50-60mm with the extrusion machine extrusion molding through the ripe uniform compound of step (5) row; (7) oven dry: the slag making recarburized ball after the moulding is put into stoving oven, and stoving oven can adopt the chain-arranged type stoving oven, and oven dry is 2 hours in temperature 130-160 ℃ environment; Carry out step (8) screening at last: remove disintegrating slag.The production unit of slag making recarburized ball is commercially available conventional equipment, and slag making recarburized ball can be made into spheroidal, oval sphere or pincushion, and the mould that is equipped with respective shapes with conventional extrusion machine can be realized.Table 1 shows the test result of its main performance index, and as can be seen, its bulk density reaches 1.591t/M greatly
3, ultimate compression strength is up to 60Kg/, and carbon content is very up to 84.5%.
Embodiment 2
1) raw material sources are with embodiment 1;
2) the batching each component content of slag making recarburized ball, meter is as shown in table 1: the coal 96 of activity degree 〉=68%, sodium hydroxide 0.8, industrial starch 1.7, water 1.5 by weight;
3) manufacturing step is with embodiment 1.
Table 1 shows the test result of its main performance index, and as can be seen, its bulk density reaches 1.642t/M greatly
3, ultimate compression strength is up to 60Kg/, and carbon content is very up to 85%.
Table 1
| 1 each component concentration (weight part) | Embodiment 1 | Embodiment 2 |
| The coal of activity degree 〉=68% | 95 | 96 |
| Sodium hydroxide | 1 | 0.8 |
| Industrial starch | 2 | 1.7 |
| Water | 2 | 1.5 |
| 2 slag making recarburized ball performances | ||
| Granularity (mm) | 60 | 60 |
| Bulk density (t/M 3) | 1.591 | 1.642 |
| Ultimate compression strength (crushing strength) (Kg/) | 60 | 60 |
| Fixed carbon content (%) | 84.5 | 85 |
With the electric arc furnace smelting steel scrap time, replace coal dust to add in the steel melting furnace with certain speed above-mentioned slag making recarburized ball from the furnace roof high hopper, by fire door oxygen blast making foamed slag, because its bulk density is big, the ultimate compression strength height, from a high position pound into, broken through the slag surface tension, the break effect has appearred, directly enter electrode centers, again because of its activity degree height, the carbon content height is so generate a large amount of carbon monoxide and carbonic acid gas bubbles with the oxygen rapid reaction and be filled in the slag that swims in the top layer under up to 1600 ℃ temperature, form foamy slag rapidly, it is very big that it has certain viscosity surface tension, becomes the effect that submerged arc is played on the blocking layer, cut off the erosion of high-temperature electric arc to the furnace wall, simultaneously heat is remained on steel scrap and insulation effect is played in molten steel inside, quicken the melting process of steel, reduce melting electric consumption, improve utilization rate of electrical; Also prevented contacting of nitrogen in molten steel and the gas, played a role, guaranteed quality product reducing the molten steel nitrogen content; Foamy slag is effective and the long advantage of persistence arranged, especially at the smelting initial stage, after steel scrap is gone into stove, when penetrating steel scrap, electrode can add slag making recarburized ball, can realize making steel the whole process making foamed slag, this is that to blow the carbon rifle irreplaceable, has reduced the loss by the fire door coal injection, has reduced production cost.In addition, it is higher that this ball contains fixed carbon, in the smelting high carbon steel, can be used as carburelant, the shop is gone into furnace bottom and is placed carburetting below the steel scrap, smelting the later stage, steel scrap all melts, and this moment, carbon content was high more all the more fast to smelting process, further energy-conservation of consumption reduction, when tapping in the later stage simultaneously,, quicken the finished product molten steel and form with a large amount of oxygen blast carbon eliminations of ultra-high speed oxygen rifle, the control down to eaf tapping point carbon gives to help preferably to the later stage carbon elimination to adopt carburelant, the may command molten steel is smelted the decarbonization rate in latter stage, avoids Molten Steel over-oxidation, improves electric furnace oxygen rifle utilization ratio.Do through the slag making recarburized ball that in electric-arc furnace steelmaking, makes by embodiment 2 that slag former is tested and cook slag former with coal dust compares with 200 tons (t), the result shows, cook slag former steel-making with coal dust and consume coal 10.47Kg/t, cook slag former steel-making with slag making recarburized ball and consume coal 6.18Kg/t, 1.86 yuan/t reduces cost; The electric arc furnace power consumption then consumes 498Kwh/t by with coal dust the time and drops to 476Kwh/t with slag making recarburized ball, and power savings is remarkable.
Claims (2)
1. a slag making recarburized ball is characterized in that it is to be mixed with mixture by weight percentage by following raw materials according, wherein: and the coal 95-96% of activity degree 〉=68%,
Industrial starch 1.5-2%,
Sodium hydroxide 0.8-1%,
Water 1-2%.
2. the manufacture method of a slag making recarburized ball as claimed in claim 1 is characterized in that comprising the steps:
(1) just broken: as the coal of activity degree 〉=68% to be broken into the broken coal piece that granularity is 10mm with pulverizer;
(2) in small, broken bits: is that the broken coal piece of 10mm further is broken into the coal particle that granularity is 0-2mm with pulverizer with granularity;
(3) once mixed pinching: be the coal particle of 0-2mm at first with activity degree 〉=68%, granularity, industrial starch, sodium hydroxide and water are according to the per-cent batching of following weight, wherein: coal particle 95-96%, industrial starch 1.5-2%, sodium hydroxide 0.8-1%, temperature is 30-40 ℃ water 1-2%, batching is placed stirrer, fully stirred 5-6 minute, mix;
(4) secondary mixing is pinched: once mix on the basis of pinching in step (3), the compound that forms is inserted in the sand mill roll, continue 5-6 minute, making industrial starch and sodium hydroxide coated equably is the coal particle surface of 0-2mm in granularity;
(5) fluffing of moulding sand: will shelve 1-2 minute through the compound that step (4) secondary mixing is pinched, and make its further ripe homogenizing of row;
(6) extrusion molding: will be the ball of granularity 50-60mm with the extrusion machine extrusion molding through the ripe uniform compound of step (5) row;
(7) oven dry: the slag making recarburized ball after the moulding is put into stoving oven, and oven dry is 2 hours in temperature 130-160 ℃ environment;
(8) screening: remove disintegrating slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101336881A CN100392112C (en) | 2005-12-27 | 2005-12-27 | Slag making recarburized ball and its production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101336881A CN100392112C (en) | 2005-12-27 | 2005-12-27 | Slag making recarburized ball and its production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1800417A CN1800417A (en) | 2006-07-12 |
| CN100392112C true CN100392112C (en) | 2008-06-04 |
Family
ID=36810626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101336881A Expired - Fee Related CN100392112C (en) | 2005-12-27 | 2005-12-27 | Slag making recarburized ball and its production method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100392112C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385147A (en) * | 2017-09-12 | 2017-11-24 | 韶关市新弘立冶金实业有限公司 | A kind of production technology that the low nitrogen carburant of high-carbon low-sulfur is produced using calcined anthracite |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB877558A (en) * | 1959-09-29 | 1961-09-13 | Southern Wharves Ltd | Improved binder for the production of coal briquettes |
| CN1043521A (en) * | 1988-12-22 | 1990-07-04 | 中国科学院山西煤炭化学研究所 | The preparation method of moulded coal |
| EP0479487A1 (en) * | 1990-09-27 | 1992-04-08 | Gary Botha | Briquettes |
| CN1107878A (en) * | 1994-03-02 | 1995-09-06 | 煤炭科学研究总院北京煤化学研究所 | Gasifying briquette for chemical fertilizer |
-
2005
- 2005-12-27 CN CNB2005101336881A patent/CN100392112C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB877558A (en) * | 1959-09-29 | 1961-09-13 | Southern Wharves Ltd | Improved binder for the production of coal briquettes |
| CN1043521A (en) * | 1988-12-22 | 1990-07-04 | 中国科学院山西煤炭化学研究所 | The preparation method of moulded coal |
| EP0479487A1 (en) * | 1990-09-27 | 1992-04-08 | Gary Botha | Briquettes |
| CN1107878A (en) * | 1994-03-02 | 1995-09-06 | 煤炭科学研究总院北京煤化学研究所 | Gasifying briquette for chemical fertilizer |
Non-Patent Citations (2)
| Title |
|---|
| 煤与粘结剂的相互作用的型煤抗压强度的关系. 李登新，吴家珊.煤炭转化，第15卷第4期. 1992 |
| 煤与粘结剂的相互作用的型煤抗压强度的关系. 李登新，吴家珊.煤炭转化，第15卷第4期. 1992 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1800417A (en) | 2006-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101177720A (en) | Slag Splashing Furnace Protection Method for Highly Oxidizing Slag in Converter | |
| CN109750210A (en) | Production method of low-oxygen, high-manganese-hydrogen-content steel | |
| CN110129510B (en) | A method for improving the life of bottom blowing and oxygen powder spraying gun | |
| CN103045789A (en) | Converter smelting method for high-silicon molten iron generated during new blow-in of blast furnace | |
| CN109136455A (en) | A method of it bessemerizing terminal slag bubble and quickly eliminates | |
| CN109207672A (en) | A kind of production method of Slagoff method and ultra-low phosphoretic steel in ultra-low phosphoretic steel production process | |
| US20180087120A1 (en) | Method and apparatus for treating iron-contained raw material using bath smelting furnace | |
| CN101487069B (en) | Foam slag inhibitor for converter | |
| CN102796841A (en) | Method for slagging steelmaking by side blowing of powder particle limestone in top-bottom combined blown converter | |
| CN100392112C (en) | Slag making recarburized ball and its production method | |
| CN102766724A (en) | Method adopting oxygen lance to jet granulated powder limestone to make slag and steel in combined blown converter | |
| JP4984946B2 (en) | Hot metal pretreatment method | |
| CN111020115A (en) | Method for refining molten steel outside furnace by using liquid blast furnace slag | |
| CN107354266A (en) | Electric furnace smelting stainless steel foaming agent and its application method | |
| CN114317885A (en) | A kind of biomass electric furnace foaming agent and its production method and application method | |
| CN113278765A (en) | Desulfurizing agent for converter and desulfurizing method | |
| CN101693940B (en) | Utilizing method of waste slag of vacuum degassing refining furnace | |
| CN101736115B (en) | Converter-strengthened slagging agent and preparation method and using method thereof | |
| CN113278760A (en) | Method for defoaming converter double-slag smelting steel slag | |
| KR100340572B1 (en) | Slag Forming Method in DC Furnace | |
| CN109504817A (en) | A kind of electric furnace foaming agent and production method | |
| CN103820598A (en) | Slag-regulating and converter-protecting method of boric sludge for slag-splashing converter protection | |
| CN116790844A (en) | Method for improving foaming of LF refining slag | |
| CN107419056A (en) | Stainless steel EAF foaming slag and its application method | |
| CN105803147A (en) | Method for smelting and reducing iron ores through converter steelmaking system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080604 Termination date: 20100127 |