CN103570368A - Magnesia carbon brick for electric furnace and preparation method thereof - Google Patents
Magnesia carbon brick for electric furnace and preparation method thereof Download PDFInfo
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- CN103570368A CN103570368A CN201310545715.0A CN201310545715A CN103570368A CN 103570368 A CN103570368 A CN 103570368A CN 201310545715 A CN201310545715 A CN 201310545715A CN 103570368 A CN103570368 A CN 103570368A
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Abstract
The invention relates to the field of refractory matters, and particularly relates to a magnesia carbon brick with good high-temperature strength for an electric furnace and a preparation method thereof. The magnesia carbon brick is characterized by comprising the following concrete operation steps: 1) firstly, weighing large-grain fused magnesite, medium fused magnesite, small-grain fused magnesite and silicone resin; pre-mixing and grinding for 3-5 minutes in a sand mixer, and then adding graphite to mix and grind for 3-5 minutes; finally adding fused magnesite powder, metal aluminum powder, activated alumina powder and asphalt, and continuing to mix and grind for 5-8 minutes; 2) adding the mixed materials to a mold, pressing and preparing a green body; and 3) feeding the green body to a tunnel drying kiln to carry out thermal treatment, wherein the temperature of a hot air inlet of the drying kiln is 40-60 DEG C, the temperature of a heat preservation interval is 220-265 DEG C, the outlet temperature is 40-60 DEG C and the thermal treatment time is not shorter than 16 hours. Compared with the prior art, the magnesia carbon brick disclosed by the invention has the advantage of continuous high strength, and the defect of poor erosion resistance caused by low strength of a pre-baked magnesia carbon brick is overcome.
Description
Technical field
The present invention relates to fire resisting material field, relate in particular to magnesia carbon brick and preparation method thereof for electric furnace that a kind of hot strength is good.
Background technology
Magnesia carbon brick is the novel refractory that 20 century 70s rise, by Japanese nine continent refractory Company, cross the bright first exploitation in limit the earliest, it is that to take magnesia (high temperature sintering magnesia or electrosmelted magnesite clinker) and carbon materials be raw material, the refractory materials made from various carbonaceous binders.Because magnesia carbon brick has that refractoriness is high, heat-shock resistance is good and corrosion resistance is strong etc. that good characteristic is widely used in iron and steel enterprise, as converter steelmaking and Electric furnace steel making.But the aggregate of magnesia carbon brick is highly purified electric smelting or magnesite clinker (general MgO >=95%), and matrix is partly high purity graphite and highly-purity magnesite.At high temperature, magnesium oxide and carbon do not react, magnesian sintering temperature is higher is about 2000 ℃, therefore magnesia carbon brick sintering not in applied at elevated temperature process, its intensity mainly comes from piles up the intensity forming between the carbochain that forms between the greying of the residual carbon of resol and graphite and magnesia particle and maintains.Common magnesia carbon brick hot strength very low (general MgO >=95%), and magnesia carbon brick in electric furnace is in use except standing the erosion of high temperature impact and slag, also be subject to impact and the mechanical shock of molten steel under electric arc stirring action of stronger electric furnace radiation, hot strength low work-ing life that affects magnesia carbon brick.The magnesia carbon brick that electric furnace is used is in addition in order to meet the needs of good electroconductibility and thermal conductivity, requirement has higher carbon content, and the raising of carbon content must bring the decline of magnesia carbon brick hot strength, therefore, how at assurance electric furnace, with magnesia carbon brick, to have in higher carbon content situation, improve its hot strength and become problem demanding prompt solution.
Summary of the invention
The object of this invention is to provide magnesia carbon brick and preparation method thereof for a kind of electric furnace, with silicone resin, substitute Fen Chuo resin, take siloxane bond as its molecular backbone chain, make magnesia carbon brick product there is higher hot strength, overcome due to the poor shortcoming of the lower flushing resistance causing of magnesia carbon brick intensity after prebake conditions.
To achieve these goals, the technical solution used in the present invention is:
A magnesia carbon brick, its each feed composition is composed as follows by weight percentage:
Granularity≤the 0.15mm of described graphite, fixed carbon content >=94%.
Softening temperature >=120 ℃ of described pitch.
The organic group number connecting on Siliciumatom in described polyorganosiloxane resin is between 1～3, and the polymerization degree is not less than 2.
The preparation method of magnesia carbon brick for described a kind of electric furnace, its concrete operation step is as follows:
1) first take the large grain electrosmelted magnesite clinker of whole formula rates, middle grain electrosmelted magnesite clinker, granule electrosmelted magnesite clinker and silicone resin, in sand mill, pre-mixed grind is 3～5 minutes, and then add graphite mixed grind 3～5 minutes, the electrofusion magnesia powder, metallic aluminium powder, active oxidation aluminium powder and the pitch that finally add remaining formula, continue mixed grind 5～8 minutes;
2) material mixing is added in mould, on 500 tons～800 tons friction presses, pressurize, make base substrate;
3) base substrate is sent into tunnel drying oven and heat-treat, 40～60 ℃ of dry kiln hot-wind inlet temperature, between heat preservation zone, temperature is 220 ℃～265 ℃, 40～60 ℃ of temperature outs, heat treatment time is not less than 16 hours.
In silicone resin, take siloxane bond as its molecular backbone chain, Si-O key is larger than the bond energy of C-C key in common organic polymer, in key, electronegative difference of Si, O atom is large, therefore bond polarity is large, connected hydrocarbyl group is played to shielding effect, improved oxidative stability, and the alkyl connecting on Si atom is subject to after thermooxidizing, what generate is the Si-O-Si key that degree of crosslinking is more stable, can prevent the fracture degraded of major key.In addition Organosilicon Polymers Surface Creation-the stable protective layer of Si-O-Si-chain, alleviated the impact on superpolymer inside, these all make Organosilicon Polymers have excellent thermotolerance and weathering resistance.Silicone resin heat resisting temperature can reach 1000～1400 ℃.
The present invention, owing to having introduced employing thermotolerance bonding agent silicone resin, can make the magnesia carbon brick after building by laying bricks or stones after 1000 ℃ of prebake conditions, still have good intensity; In smelting process, the temperature of magnesia carbon brick working lining can reach rapidly 1600 ℃ of left and right, and in this process, silicone resin decomposition loses cohesive action substantially, but the SiO forming
2/ SiO has higher activity can react with active oxidation aluminium powder the dystectic magnesium-aluminium spinel of generation, has improved the bonding strength of matrix; In addition, metallic aluminium powder and graphite can anti-raw reaction generate the aluminium carbide crystal with interlaced needle-like above at 1200 ℃, and magnesia particle is only bonded together and makes magnesia carbon brick at high temperature have higher intensity.
Prior art is compared, and the invention has the beneficial effects as follows:
1) adopt the good silicone resin of thermotolerance to replace resol, not only environmental protection but also can improve the intensity after magnesia carbon brick prebake conditions; 2) silicone resin has polarity and non-polar group simultaneously, can well be combined with magnesia particle and can, well in conjunction with graphite, make magnesia carbon brick have better normal temperature strength; 3) SiO after pyrolytic decomposition belongs to amorphous fine-particle, has higher activity and is easy to react with active oxidation aluminium powder the dystectic magnesium-aluminium spinel of generation, has improved high temperature bond intensity and the slag penetration resistance energy of magnesia carbon brick; 4), in temperature during higher than 1200 ℃, it is that magnesia carbon brick has higher hot strength that graphite and metallic aluminium powder generate the interlaced carborundum crystals of high-melting-point; 5) magnesia carbon brick of the present invention is compared and is had continuous higher-strength with common magnesia carbon brick, has overcome because of the poor shortcoming of the lower flushing resistance causing of magnesia carbon brick intensity after prebake conditions.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
The preparation method of magnesia carbon brick for a kind of electric furnace of the present invention, its concrete operation step is as follows:
1) first take the large grain electrosmelted magnesite clinker of whole formula rates, middle grain electrosmelted magnesite clinker, granule electrosmelted magnesite clinker and silicone resin, in sand mill, pre-mixed grind is 3～5 minutes, and then add graphite mixed grind 3～5 minutes, the electrofusion magnesia powder, metallic aluminium powder, active oxidation aluminium powder and the pitch that finally add remaining formula, continue mixed grind 5～8 minutes;
2) material mixing is added in mould, on 500 tons～800 tons friction presses, pressurize, make base substrate;
3) base substrate is sent into tunnel drying oven and heat-treat, 40～60 ℃ of dry kiln hot-wind inlet temperature, between heat preservation zone, temperature is 220 ℃～265 ℃, 40～60 ℃ of temperature outs, heat treatment time is not less than 16 hours.
Each embodiment and comparative example finished product test the results are shown in Table 1.
In embodiment, the granularity≤0.15mm of graphite, fixed carbon content >=94%; Softening temperature >=120 ℃ of pitch; The organic group number connecting on Siliciumatom in polyorganosiloxane resin is between 1～3, and the polymerization degree is not less than 2.
Table 1
The anti-folding data results of high temperature from test item can find out, utilizes under the high temperature of the magnesia carbon brick that the present invention makes intensity apparently higher than common magnesia carbon brick in the situation that of same carbon content.
Claims (5)
1. an electric furnace magnesia carbon brick, is characterized in that, its each feed composition is composed as follows by weight percentage:
2. a kind of electric furnace magnesia carbon brick according to claim 1, is characterized in that, the granularity≤0.15mm of described graphite, fixed carbon content >=94%.
3. a kind of electric furnace magnesia carbon brick according to claim 1, is characterized in that softening temperature >=120 ℃ of described pitch.
4. a kind of electric furnace magnesia carbon brick according to claim 1, is characterized in that, the organic group number connecting on Siliciumatom in described polyorganosiloxane resin is between 1～3, and the polymerization degree is not less than 2.
5. a kind of preparation method of electric furnace use magnesia carbon brick described in claim 1, is characterized in that, its concrete operation step is as follows:
1) first take the large grain electrosmelted magnesite clinker of whole formula rates, middle grain electrosmelted magnesite clinker, granule electrosmelted magnesite clinker and silicone resin, in sand mill, pre-mixed grind is 3～5 minutes, and then add graphite mixed grind 3～5 minutes, the electrofusion magnesia powder, metallic aluminium powder, active oxidation aluminium powder and the pitch that finally add remaining formula, continue mixed grind 5～8 minutes;
2) material mixing is added in mould, on 500 tons～800 tons friction presses, pressurize, make base substrate;
3) base substrate is sent into tunnel drying oven and heat-treat, 40～60 ℃ of dry kiln hot-wind inlet temperature, between heat preservation zone, temperature is 220 ℃～265 ℃, 40～60 ℃ of temperature outs, heat treatment time is not less than 16 hours.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108191439A (en) * | 2018-02-28 | 2018-06-22 | 攀钢冶金材料有限责任公司 | A kind of blast furnace slag high temperature cabonization electric furnace refractory brick and preparation method thereof |
| CN108863414A (en) * | 2018-08-14 | 2018-11-23 | 上海新泰山高温工程材料有限公司 | A kind of high performance magnesia carbon brick and preparation method thereof |
| CN110606733A (en) * | 2019-11-12 | 2019-12-24 | 攀钢冶金材料有限责任公司 | Modified magnesia carbon brick and preparation method thereof |
| CN111996333A (en) * | 2020-08-28 | 2020-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing oxidation of magnesia carbon brick of electric furnace |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101708996A (en) * | 2009-11-19 | 2010-05-19 | 鞍山市和丰耐火材料有限公司 | Method for producing slag line magnesia carbon brick for clean steel ladles |
| CN102701752A (en) * | 2012-01-10 | 2012-10-03 | 河南安瑞高温材料股份有限公司 | High-heat-conductive refractory material for carbon roasting fire wall and preparation method of high-heat-conductive refractory material |
| CN102765953A (en) * | 2012-08-07 | 2012-11-07 | 营口鲅鱼圈耐火材料有限公司 | Magnesia carbon brick containing composite antioxidant and preparation thereof |
-
2013
- 2013-11-06 CN CN201310545715.0A patent/CN103570368A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708996A (en) * | 2009-11-19 | 2010-05-19 | 鞍山市和丰耐火材料有限公司 | Method for producing slag line magnesia carbon brick for clean steel ladles |
| CN102701752A (en) * | 2012-01-10 | 2012-10-03 | 河南安瑞高温材料股份有限公司 | High-heat-conductive refractory material for carbon roasting fire wall and preparation method of high-heat-conductive refractory material |
| CN102765953A (en) * | 2012-08-07 | 2012-11-07 | 营口鲅鱼圈耐火材料有限公司 | Magnesia carbon brick containing composite antioxidant and preparation thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108191439A (en) * | 2018-02-28 | 2018-06-22 | 攀钢冶金材料有限责任公司 | A kind of blast furnace slag high temperature cabonization electric furnace refractory brick and preparation method thereof |
| CN108191439B (en) * | 2018-02-28 | 2021-04-27 | 攀钢冶金材料有限责任公司 | Refractory brick for blast furnace slag high-temperature carbonization electric furnace and preparation method thereof |
| CN108863414A (en) * | 2018-08-14 | 2018-11-23 | 上海新泰山高温工程材料有限公司 | A kind of high performance magnesia carbon brick and preparation method thereof |
| CN110606733A (en) * | 2019-11-12 | 2019-12-24 | 攀钢冶金材料有限责任公司 | Modified magnesia carbon brick and preparation method thereof |
| CN111996333A (en) * | 2020-08-28 | 2020-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing oxidation of magnesia carbon brick of electric furnace |
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Application publication date: 20140212 |