CN101029346A - Deoxygenation furnace-curing agent and its production - Google Patents
Deoxygenation furnace-curing agent and its production Download PDFInfo
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- CN101029346A CN101029346A CN 200710054190 CN200710054190A CN101029346A CN 101029346 A CN101029346 A CN 101029346A CN 200710054190 CN200710054190 CN 200710054190 CN 200710054190 A CN200710054190 A CN 200710054190A CN 101029346 A CN101029346 A CN 101029346A
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Abstract
A deoxy-furnace agent and its production are disclosed. The furnace agent consists of magnesium 45-70wt%, silicon carbide10-20wt%, graphite16-25wt% and calcium oxide4-10wt%. The process is carried out by physical and chemical inspecting for raw material, metering formula, mechanically lifting, mixing while agitating, wheel milling while rolling, spheroidizing while shaping, drying, packing and storing. It has stable reactive speed, good deoxygenation effect and better reduction effect.
Description
Technical field:
The invention belongs to smelting iron and steel subsidiary material technical field, be specifically related to deoxygenation furnace-curing agent of using in a kind of steel-smelting electric furnace and preparation method thereof.
Background technology:
In traditional smelting iron and steel technological process, what generally adopt is with CaC
2, C, synthetic materials such as Mn or rare metal are made reductor, because CaC
2, C, the fusing point height must be introduced fluorochemical and make catalyzer, often finishes fluorochemical serious etch furnace wall in participating in reaction process because of the deoxidation index, simultaneously, has also reduced the viscosity of slag, and low viscous slag is at the intensive gas (H in the reaction generation
2O, CO
2Deng) impact down, the molten slag boiling is violent, even splashes, the problem that causes deslagging difficulty etc. to be difficult to overcome.By the deslagging analysis, TFe and manganese Mn content are higher in the slag, influence steel quality and iron and steel output, and the furnace wall etch rates is fast, and furnace life is short partially, waste goods, materials and equipments, and smelting cost height.
Summary of the invention:
Problem at above-mentioned existence; the object of the present invention is to provide a kind of deoxygenation furnace-curing agent and preparation method thereof; deoxygenation furnace-curing agent with this method preparation; it is stable to have speed of response; deoxidation effect is remarkable; improved the reduction effect of Fe in the iron smelting process, improved the ferrimanganic recovery rate, simultaneously the furnace wall has been played a protective role.
For achieving the above object, the technical scheme that the present invention takes: this deoxygenation furnace-curing agent is made up of magnesium oxide, silicon carbide, graphite, calcium oxide, and the each component weight percent is: magnesium oxide 45-70%, silicon carbide 10-20%, graphite 16-25%, calcium oxide 4-10%.
The deoxygenation furnace-curing agent preparation method:
1, raw material physics and chemistry detects: measure moisture content, various raw material effective component content, the oxious component S that influences the smelting iron and steel quality, P content, and standby after the assay was approved;
2, metering prescription: with the starting material that are up to the standards, according to the prescription accurate measurement;
3, mechanical lifting: the starting material of metering are transported to batch mixing stone roller mixing stirring by lifting mechanism;
4, mix stirring: material enters batch mixing and grinds mixing stirring 10 minutes, stirs;
5, rolling roll extrusion: with wheel roller raw material is carried out roll extrusion in 10 minutes, and add suitable moisture content, amount of water generally is controlled at 8-15%;
6, pressure ball moulding: by transfer roller, raw material is transported to ball press, is squeezed into pillow type ball by ball press;
7, go into stove oven dry: after the pressure ball moulding, sift out residue at random, pressure ball is sent into the tunnel like stoving oven dried 1～1.5 hour under 230-285 ℃ of temperature condition, treat that moisture content reaches 0.6% when following, coming out of the stove cools;
8, packing warehouse-in.
Beneficial effect of the present invention: according to the deoxygenation furnace-curing agent that above-mentioned preparation method makes, owing to contain higher deoxidation material composition in the deoxygenation furnace-curing agent: SiC+C 〉=32%, in steel melting furnace, SiC resolves into C and SiO under hot conditions
2, finish a deoxidation link, C+O → CO
2↑, proceed deoxidation, make that dissolved oxygen disappears substantially in the molten steel, in the hope of the tapping steady quality, reach the deoxidation purpose.Magnesium oxide is to adopt the calcining brucite to allocate into, the extension excellent property of magnesium, and MgO decomposes rapidly under hot conditions, and with materials such as aluminium in the slag, silicon, calcium, congruent melting forms heterogeneous coexistence thick liquid, makes slag remain on an ideal range of viscosities.Thereby make the furnace wall dross even, do not have the visible brickwork joint of obvious etch shape, help improving furnace life, make on average to go out steel heat and bring up to about 2000 times, protected body of heater, saved goods, materials and equipments, reduced the tapping cost by 1356 times before using.Carbon amount in the product is to allocate into high-carbon graphite, graphite speed of response under the condition of high temperature is stable, deoxidation is good, and can make the slag foam state keep a continual and steady relatively process, molten slag does not spatter and does not boil, and has overcome other metallurgic auxiliary materials and has in use seethed with excitement too violent, cause electrode hole, charge cavity, bell slit to smolder and scurry fiery phenomenon, optimize operating environment, improved operational condition, helped environmentally-friendly sanitary and safety in production.Use this deoxygenation furnace-curing agent to make tapping carbon, bring up to 0.062% by 0.051% before using; TFe content reduces deslagging TFe loss 7.61% by using preceding average 41.91% to drop to 34.30% in the discharge slag; Mn reduces deslagging Mn loss 0.38% by by using preceding 4.05% to drop to 3.67% in the discharge slag.The tapping steady quality, recovery rate obviously improves.
In the test of Baoshan Iron ﹠ Steel Co., Ltd's Baosteel Branch's steelworks its result of use is described below by this invention product:
One, deoxygenation furnace-curing agent technical qualification
1, electric furnace deoxygenation furnace-curing agent chemical ingredients
| Composition | MgO | SiC | C | CaO | H 2O |
| ％wt | ≥45 | 10～20 | 16～25 | 4～10 | ≤0.7％ |
Wherein, 1. MgO adopts the calcining brucite to allocate into; 2. SiC adopts the SiC raw material of SiC 〉=70% to allocate into; 3. C adopts the graphite of 85%C to allocate into; 4. CaO adopts quickened lime to allocate into.
2, electric furnace deoxygenation furnace-curing agent size range
| Physical dimension (cm) | Greater than the 35mm screen overflow | Less than the 15mm screen underflow |
| 35×35×40 | - | ≤5％ |
3, electric furnace deoxygenation furnace-curing agent volume density is greater than 1.8g/cm
3
4, electric furnace deoxygenation furnace-curing agent intensity 40-50kg/cm
2, dropping strength: 2 meters high once freely fall to cement floor, and 〉=10mm granularity accounts for total weight percent 〉=85%.
Two, deoxygenation furnace-curing agent process of the test
1, this test material gross weight is 60 tons.
2, adding method: divide two batches of addings, power consumption 20000kWh adds first during the left and right sides, 300 kilograms of add-ons; Add second batch during the power consumption 25000kWh left and right sides, 500～600 kilograms of add-ons.
3, test period: August 30 in 2006 (heat (batch) number 747051 beginnings)～on September 3rd, 2006 (heat (batch) number 847132 finishes).
Three, deoxygenation furnace-curing agent result of use
1, in the deoxygenation furnace-curing agent process of the test, get 4 slag samples at random and analyze, its composition and the contrast of not test (N.T.) deoxygenation furnace-curing agent heat slag specimen composition see the following form:
| Kind | Slag specimen number | Steel grade | Tapping carbon | Tapping phosphorus | TFe | CaO | SiO 2 | MgO | P 2O 5 | S | MnO |
| Do not add deoxygenation furnace-curing agent | 847048 | 25Mn2 | 0.038％ | 0.003％ | 44.12 | 33.28 | 6.00 | 4.35 | 0.774 | 0.064 | 3.50 |
| 847050 | 25Mn2 | 0.048％ | 0.003％ | 41.51 | 32.84 | 8.11 | 6.16 | 0.959 | 0.068 | 3.30 | |
| 845783 | 25Mn2 | 0.044％ | 0.006％ | 42.03 | 30.77 | 9.20 | 6.22 | 1.036 | 0.078 | 4.28 | |
| 845777 | St45EQ | 0.046％ | 0.004％ | 43.69 | 30.43 | 8.80 | 6.41 | 1.023 | 0.074 | 4.27 | |
| 845779 | 27SiMn | 0.075％ | 0.006％ | 42.83 | 30.25 | 8.94 | 7.71 | 1.042 | 0.070 | 4.32 | |
| 845775 | 25Mn2 | 0.054％ | 0.003％ | 39.31 | 32.43 | 9.06 | 8.35 | 1.030 | 0.075 | 4.36 | |
| 845781 | 27SiMn | 0.050％ | 0.005％ | 39.85 | 31.66 | 9.25 | 7.82 | 1.115 | 0.079 | 4.32 | |
| On average | 0.051％ | 0.046％ | 41.91 | 31.67 | 8.48 | 6.72 | 0.997 | 0.072 | 4.05 | ||
| The deoxygenation furnace-curing agent test | 747051 | 25Mn2 | 0.067％ | 0.005％ | 34.42 | 35.75 | 9.78 | 6.73 | 1.143 | 0.058 | 3.60 |
| 747067 | St45EQ | 0.076％ | 0.005％ | 32.97 | 34.24 | 12.71 | 6.81 | 1.267 | 0.071 | 4.05 | |
| 747069 | St45EQ | 0.072％ | 0.007％ | 34.97 | 33.34 | 13.51 | 5.79 | 1.169 | 0.071 | 3.66 | |
| 747079 | 25MnG | 0.064％ | 0.005％ | 34.84 | 35.71 | 9.67 | 6.92 | 1.006 | 0.063 | 3.37 | |
| On average | 0.069％ | 0.049％ | 34.30 | 34.76 | 11.42 | 6.56 | 1.146 | 0.068 | 3.67 |
2, owing to contain higher deoxidation composition (SiC+C 〉=32%) in the deoxygenation furnace-curing agent, as seen, all iron content will significantly be lower than the contrast heat in the test heat slag, on average reduces by 7.6% in the slag specimen composition contrast table; Manganese oxide also on average reduces by 0.38% in the slag.
3, owing to contain higher magnesium oxide (MgO 〉=45%) in the deoxygenation furnace-curing agent, content of magnesia is suitable with the contrast heat in the slag of test heat, has all reached more than 6.50%.For safeguarding furnace lining, do not add the every stove 2 tons of left and right sides light dolomite pieces of adding of deoxygenation furnace-curing agent heat and 900 kilograms of slag supplying agents etc. and contain magnesian furnace retaining auxiliary material, the every stove of test heat adds 1.5 tons of light dolomite briquettings and 800～900 kilograms of deoxygenation furnace-curing agents.Magnesium oxide adopts the calcining brucite to allocate in the deoxygenation furnace-curing agent, decomposes rapidly.
4, owing to ferric oxide in the slag significantly reduces, and content of magnesia is higher in the slag, and slag viscosity obviously improves in the deoxygenation furnace-curing agent test heat, has eliminated the rare partially phenomenon of former slag.Slag viscosity improves furnace wall, back dry slag effect and is clearly better, and the furnace wall dry slag is even, does not have obviously visible brickwork joint and exists.
5, owing to adopting the graphite of 85%C, carbon in the deoxygenation furnace-curing agent allocates into, the graphite carbon long reaction time, foam duration is long and stable, overcome former furnace retaining auxiliary material and added the too violent and electrode hole of fashionable foamy slag, charge cavity, bell slit etc. and locate to smolder and scurry fiery phenomenon, significantly improved envrionment conditions.
6, in the deoxygenation furnace-curing agent process of the test, dephosphorization, the desulfurization of visible slag do not have deterioration from the slag specimen contrast.
Below in conjunction with accompanying drawing specific embodiments of the invention are described in further detail.
Description of drawings:
Fig. 1 is preparation technology's schema of deoxygenation furnace-curing agent of the present invention
Embodiment:
Embodiment 1:
This deoxygenation furnace-curing agent comprises magnesium oxide, silicon carbide, graphite, calcium oxide.Wherein magnesium oxide is obtained by the calcining brucite, calcining brucite Mg (OH)
2Generate MgO at 1200 ℃ of temperature lower calcinations, calcining back MgO content reaches more than 90%, consumption is 45% of a weight percentages, silicon carbide adopts GB SiC70% industrial goods, consumption is 20% of a weight percentages, and graphite adopts the high-carbon graphite of carbon containing 85-90%, and consumption is 25% of a weight percentages, calcium oxide is made quickened lime CaCO by the quickened lime calcining
3Calcining generates CaO under 1250 ℃ high temperature, and CaO is not less than 70% after the hydrolysis, and consumption is 10% of a weight percentages.The preparation method of this deoxygenation furnace-curing agent: 1, raw material physics and chemistry detects: 1. measure moisture content, H
22. O＜0.6% measures various raw material effective component contents: 3. MgO 〉=45%, SiC 〉=70%, C 〉=85%, CaO 〉=70% measure oxious component S, the P content that influences the smelting iron and steel quality, S＜0.03, and P＜0.03 enters production sequence after the assay was approved; 2, metering prescription: according to production batch with smelt steel grade and adopt smelting equipment, with the starting material that are up to the standards according to the prescription accurate measurement; 3, mechanical lifting: the starting material of metering are transported to batch mixing stone roller mixing stirring by lifting mechanism; 4, mix stirring: material enters batch mixing and grinds mixing stirring 10 minutes, stirs; 5, rolling roll extrusion: with SND1630 type wheel roller raw material is carried out roll extrusion in 10 minutes, and add moisture content, amount of water is controlled at 8%, to improve the cohesiveness of raw material, improves the balling-up effect; 6, pressure ball moulding: by the flat defeated machine of net belt type, raw material is transported to DYQD560N type ball press, reaches 300Kg/cm in crushing strength
2Under the condition, be squeezed into 35 * 35 * 40 specification pillow type balls; 7, go into stove oven dry: after the pressure ball moulding, sift out residue at random, pressure ball is sent into the tunnel like stoving oven dried 1.5 hours under 230 ℃ of left and right sides temperature condition, treat that moisture content reaches 0.6% when following, coming out of the stove cools; 8, packing warehouse-in.
Embodiment 2:
This deoxygenation furnace-curing agent comprises magnesium oxide, silicon carbide, graphite, calcium oxide.Wherein magnesium oxide is obtained by the calcining brucite, calcining brucite Mg (OH)
2Generate MgO at 1200 ℃ of temperature lower calcinations, calcining back MgO content reaches more than 90%, consumption is 55% of a weight percentages, silicon carbide adopts GB SiC70% industrial goods, consumption is 15% of a weight percentages, and graphite adopts the high-carbon graphite of carbon containing 85-90%, and consumption is 20% of a weight percentages, calcium oxide is made quickened lime CaCO by the quickened lime calcining
3Calcining generates CaO under 1250 ℃ high temperature, and CaO is not less than 70% after the hydrolysis, and consumption is 10% of a weight percentages.The preparation method of this deoxygenation furnace-curing agent: 1, raw material physics and chemistry detects: 1. measure moisture content, H
2O＜0.6%, 2. measure various raw material effective component contents: MgO 〉=45%, SiC 〉=70%, C 〉=85%, CaO 〉=70%, 3. measure oxious component S, the P content that influences the smelting iron and steel quality, S＜0.03, P＜0.03 enters production sequence after the assay was approved; 2, metering prescription: according to production batch with smelt steel grade and adopt smelting equipment, with the starting material that are up to the standards according to the prescription accurate measurement; 3, mechanical lifting: the starting material of metering are transported to batch mixing stone roller mixing stirring by lifting mechanism; 4, mix stirring: material enters batch mixing and grinds mixing stirring 10 minutes, stirs; 5, rolling roll extrusion: with SND1630 type wheel roller raw material is carried out roll extrusion in 10 minutes, and add moisture content, amount of water is controlled at 10%, to improve the cohesiveness of raw material, improves the balling-up effect; 6, pressure ball moulding: by the flat defeated machine of net belt type, raw material is transported to DYQD560N type ball press, reaches 300Kg/cm in crushing strength
2Under the condition, be squeezed into 35 * 35 * 40 specification pillow type balls; 7, go into stove oven dry: after the pressure ball moulding, sift out residue at random, pressure ball is sent into the tunnel like stoving oven dried 1.3 hours under 245 ℃ of left and right sides temperature condition, treat that moisture content reaches 0.6% when following, coming out of the stove cools; 8, packing warehouse-in.
Embodiment 3:
This deoxygenation furnace-curing agent comprises magnesium oxide, silicon carbide, graphite, calcium oxide.Wherein magnesium oxide is obtained by the calcining brucite, calcining brucite Mg (OH)
2Generate MgO at 1200 ℃ of temperature lower calcinations, calcining back MgO content reaches more than 90%, consumption is 70% of a weight percentages, silicon carbide adopts GB SiC70% industrial goods, consumption is 10% of a weight percentages, and graphite adopts the high-carbon graphite of carbon containing 85-90%, and consumption is 16% of a weight percentages, calcium oxide is made quickened lime CaCO by the quickened lime calcining
3Calcining generates CaO under 1250 ℃ high temperature, and CaO is not less than 70% after the hydrolysis, and consumption is 4% of a weight percentages.The preparation method of this deoxygenation furnace-curing agent: 1, raw material physics and chemistry detects: 1. measure moisture content, H
22. O＜0.6% measures various raw material effective component contents: 3. MgO 〉=45%, SiC 〉=70%, C 〉=85%, CaO 〉=70% measure oxious component S, the P content that influences the smelting iron and steel quality, S＜0.03, and P＜0.03 enters production sequence after the assay was approved; 2, metering prescription: according to production batch with smelt steel grade and adopt smelting equipment, with the starting material that are up to the standards according to the prescription accurate measurement; 3, mechanical lifting: the starting material of metering are transported to batch mixing stone roller mixing stirring by lifting mechanism; 4, mix stirring: material enters batch mixing and grinds mixing stirring 10 minutes, stirs; 5, rolling roll extrusion: with SND1630 type wheel roller raw material is carried out roll extrusion in 10 minutes, and add moisture content, amount of water is controlled at 15%, to improve the cohesiveness of raw material, improves the balling-up effect; 6, pressure ball moulding: by the flat defeated machine of net belt type, raw material is transported to DYQD560N type ball press, reaches 300Kg/cm in crushing strength
2Under the condition, be squeezed into 35 * 35 * 40 specification pillow type balls; 7, go into stove oven dry: after the pressure ball moulding, sift out residue at random, pressure ball is sent into the tunnel like stoving oven dried 1 hour under 245 ℃ of left and right sides temperature condition, treat that moisture content reaches 0.6% when following, coming out of the stove cools; 8, packing warehouse-in.
Claims (3)
1, a kind of deoxygenation furnace-curing agent is characterized in that: be made up of magnesium oxide, silicon carbide, graphite, calcium oxide, its each component weight percent is: magnesium oxide 45-70%, silicon carbide 10-20%, graphite 16-25%, calcium oxide 4-10%.
2, deoxygenation furnace-curing agent according to claim 1 is characterized in that the weight percent of each component is: magnesium oxide 55%, silicon carbide 15%, graphite 20%, calcium oxide 10%.
3, the preparation method of deoxygenation furnace-curing agent according to claim 1 and 2,
1) raw material physics and chemistry detects: measure moisture content, various raw material effective component content, the oxious component S that influences the smelting iron and steel quality, P content, and standby after the assay was approved;
2) metering prescription: with the starting material that are up to the standards, according to the prescription accurate measurement;
3) mechanical lifting: the starting material of metering are transported to batch mixing stone roller mixing stirring by lifting mechanism;
4) mix stirring: material enters batch mixing and grinds mixing stirring 10 minutes, stirs;
5) rolling roll extrusion: with wheel roller raw material is carried out roll extrusion in 10 minutes, and add suitable moisture content, amount of water generally is controlled at 8-15%;
6) pressure ball moulding: by transfer roller, raw material is transported to ball press, is squeezed into pillow type ball by ball press;
7) go into stove oven dry: after the pressure ball moulding, sift out residue at random, pressure ball is sent into the tunnel like stoving oven dried 1～1.5 hour under 230-285 ℃ of temperature condition, treat that moisture content reaches 0.6% when following, coming out of the stove cools;
8) packing warehouse-in.
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| CN101798234A (en) * | 2010-02-12 | 2010-08-11 | 闫晓峰 | Titanium carbonitride blast furnace protecting agent and preparation method thereof |
| CN102234700A (en) * | 2010-04-20 | 2011-11-09 | 宝山钢铁股份有限公司 | Electric furnace slag reactant and preparation method thereof |
| CN102534099A (en) * | 2012-03-06 | 2012-07-04 | 通化市宇鑫耐火材料有限公司 | MgO-C ball capable of improving splashing slag furnace protection effect of converter |
| CN102660662A (en) * | 2012-05-11 | 2012-09-12 | 西峡县兴宝冶金保温耐材有限公司 | Method for producing deoxidized furnace protecting agent by utilizing waste magnesia carbon brick and gangue |
| CN102952922A (en) * | 2011-08-19 | 2013-03-06 | 鞍钢股份有限公司 | Magnesium deoxidizer, and production method and use method thereof |
| CN104099469A (en) * | 2014-06-26 | 2014-10-15 | 武汉钢铁(集团)公司 | Resource utilization method of waste magnesia powder after treating oriented silicon steel |
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| AU2001250996A1 (en) * | 2000-03-27 | 2001-10-08 | NEWLAND, Bart G. | Compositions and methods for the deoxidation of steel |
| WO2002022891A1 (en) * | 2000-09-14 | 2002-03-21 | Nkk Corporation | Refining agent and refining method |
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| CN102234700B (en) * | 2010-04-20 | 2013-03-13 | 宝山钢铁股份有限公司 | Electric furnace slag reactant and preparation method thereof |
| CN102952922B (en) * | 2011-08-19 | 2015-06-03 | 鞍钢股份有限公司 | Magnesium deoxidizer, and production method and use method thereof |
| CN102952922A (en) * | 2011-08-19 | 2013-03-06 | 鞍钢股份有限公司 | Magnesium deoxidizer, and production method and use method thereof |
| CN102534099A (en) * | 2012-03-06 | 2012-07-04 | 通化市宇鑫耐火材料有限公司 | MgO-C ball capable of improving splashing slag furnace protection effect of converter |
| CN102660662A (en) * | 2012-05-11 | 2012-09-12 | 西峡县兴宝冶金保温耐材有限公司 | Method for producing deoxidized furnace protecting agent by utilizing waste magnesia carbon brick and gangue |
| CN104894333A (en) * | 2014-03-05 | 2015-09-09 | 鞍钢股份有限公司 | Method for deoxidizing molten steel in converter |
| CN104099469A (en) * | 2014-06-26 | 2014-10-15 | 武汉钢铁(集团)公司 | Resource utilization method of waste magnesia powder after treating oriented silicon steel |
| CN104099469B (en) * | 2014-06-26 | 2016-06-15 | 武汉钢铁(集团)公司 | The resource utilization method of discarded magnesia powder after orientation silicon steel heat treatment |
| CN104131132A (en) * | 2014-07-24 | 2014-11-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Magnesian furnace protection burden for converter |
| CN104131132B (en) * | 2014-07-24 | 2016-06-22 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of magnesia furnace retaining material of coverter pig |
| CN104561736A (en) * | 2014-12-29 | 2015-04-29 | 芜湖国鼎机械制造有限公司 | High-strength gray cast iron, casting and preparation method of high-strength gray cast iron |
| CN113502375A (en) * | 2021-08-31 | 2021-10-15 | 芜湖县天海耐火炉料有限公司 | Rare earth carbon composite deoxidizer and preparation process thereof |
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