CN104294000A - Method for producing high phosphorus steel in 180-tonnage ore furnace - Google Patents
Method for producing high phosphorus steel in 180-tonnage ore furnace Download PDFInfo
- Publication number
- CN104294000A CN104294000A CN201410570349.9A CN201410570349A CN104294000A CN 104294000 A CN104294000 A CN 104294000A CN 201410570349 A CN201410570349 A CN 201410570349A CN 104294000 A CN104294000 A CN 104294000A
- Authority
- CN
- China
- Prior art keywords
- molten iron
- phosphorus
- steel
- iron
- content
- 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.)
- Granted
Links
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a method for producing high phosphorus steel in a 180-tonnage ore furnace. The method comprises the following steps: (1) adding molten iron at the temperature of over 1250 DEG C into a converter, adding active lime, lightly calcined dolomite and high-phosphorus iron ore into the converter, and performing 1.85m lance position oxygen blowing for 90-120 seconds, so that the high-phosphorus iron ore and lime are rapidly molten; (2) adding the active lime, performing 1.7m lance position oxygen blowing to 300-350 seconds, adding the high-phosphorus iron ore, and maintaining 1.8m lance position oxygen blowing to 450 seconds; and (3) finally, reducing the lance position to 1.65m, continuously blowing to 900-930 seconds, finally adjusting the final temperature to 1660-1690 DEG C, controlling the carbon content of the final molten steel to be 0.08-0.1 percent, ending the temperature, and tapping according to the conventional program, thereby obtaining the high phosphorus steel. According to the method disclosed by the invention, a common converter smelting process is taken as the basis, massive raw ore of the high-phosphorus iron ore is added to the converter for reaction, and the high phosphorus steel is directly produced.
Description
Technical field
The invention belongs to field of steel metallurgy, specifically refer to the method for producing high phosphoretic steel in the stove of a kind of 180t ore deposit.
Background technology
From 1996, China becomes the maximum country of global output of steel, China Steel production capacity reached 1,200,000,000 tons in 2013, account for about 50% of world steel aggregated capacity, more than 44% of ultimate production, from 2011, the structural surplus of domestic iron and steel production capacity, the situation that demand growth is glided rapidly starts to occur and the continuous crisis to more deep layer development, this situation is all difficult to remarkable improvement occurs within the coming years, add the not existing obvious improvement of development of world economy, fail to bring worldwide optimum demand growth, by International Iron Ore stone price height enterprise and the finished product price Double Pressures under harsh market competition, it is totally superfluous that Steel Industrial has entered production capacity, whole industry meagre profit runs the Stage of Strategic Transformation even lost.
At present except the profound cause of production capacity surplus, the outstanding reason that iron and steel enterprise's profit degradation even loses is the present situation that the China iron deposit stone degree of self-sufficiency is low, because imported Fe ore cost remains high, steel production cost, the outlet of China are all a greater impact, therefore, the iron ore degree of self-sufficiency is one of basic determinative of domestic steel industry development.At present, China's iron ore degree of self-sufficiency is about about 30%, and namely ore external dependence degree reaches about seventy percent, and huge raw materials cost expenditure has engulfed most of profit of iron and steel enterprise, add the level of steel valency before 2013 fall back 20 years, exacerbate current whole industry quagmire further.The production that the core reasons that the China iron deposit stone degree of self-sufficiency is low are that the own most grade of iron ore of China is low, associated minerals are difficult to select smelting to cause more and utilize high cost, current domestic iron ore average grade is lower than 30%, far below Australia, Brazil etc. easily more than 60% grade, and mine development is seriously delayed, tempo is far below iron and steel production capacity rate of growth.West place in Hubei iron ore is high-phosphorus hematite Kuang Ji district of China, verified stock number and reached 2,000,000,000 tons, deposit scale is large and concentrate, and is one of mining area that resource in the large iron producing area of China ten is the most concentrated, and account for more than 56.2% of national similar resource, be the following important iron ore strategic support of China.But because in this mining area iron ore, phosphorus content is high, associated minerals are more and existence form complicated, mechanical beneficiation and to put forward iron dephosphorization difficulty high, cause the resource in this mining area can not meet the raw materials requirement of our existing iron and steel process for combination producing in batches always, fail to realize mass-producing to develop, conduct a research at present to comprise with more approach on probation and join ore deposit as blast-furnace smelting, dark choosing is carried iron and is fallen phosphorus etc., join ore deposit as blast-furnace smelting to use, for ensureing to smelt stability, very low with addition of ratio, be no more than 10% at most, and increase follow-up converter smelting cost, dark choosing is carried iron and is fallen phosphorus, to equipment and technical requirements very high, and do not possess cost advantage, need could mass-producing to be applied after correlation technique continuous advancement.
The typical feature of west place in Hubei iron ore is high phosphorus, low-sulfur, poor iron, at home main flow with blast furnace, converter is under core smelts the technical process condition of reactor, substantially function and the technique of liquid iron pretreatment dephosphorizing is not possessed at present, therefore, high phosphorus hot metal is produced with addition of high-phosphorus iron ore in blast furnace, common steel grade is produced again by existing converter smelting process, then need to add a large amount of slag material in converter steelmaking process, by increasing total quantity of slag, improve basicity of slag to ensure higher dephosphorization rate, tapping phosphorus content is made to reach the phosphorus span of control of steel grade, advanced steel enterprise is as Baosteel at home, Wuhan Iron and Steel Plants etc. have developed the techniques such as double slag process to process high phosphorus hot metal, but on the whole, technology stability is not enough, cost is higher, productivity is lower, fail to embody advantage.
Along with the development of Iron And Steel Industry, the individual requirement of user to steel performance becomes increasingly conspicuous, and phosphorus is broken as the concept of steel grade harmful element, in recent years, the kind of high phosphorus content steel grade as weather resisting steel, steel for container and phosphor intensified steel etc. is increasing, and demand is obviously amplified.The method of existing production high phosphorus mainly with conventional converter smelting for core, in refining process, improving phosphorus content by adding ferrorphosphorus, finally reaching steel grade phosphorus content target call.The method is stripped of most phosphorus in molten steel on the one hand in converter steelmaking process, then in refining process, ferrorphosphorus is added again, cause larger mineral wealth waste, on the other hand, produce the process that ferrorphosphorus is highly energy-consuming, high pollution, be unfavorable for the green of steel industry, Sustainable development.
Summary of the invention
The object of the invention is to provide the method for producing high phosphoretic steel in the stove of a kind of 180t ore deposit according to the deficiencies in the prior art, the method can directly utilize high-phosphorus iron ore to produce high phosphoretic steel, improves raw material availability, simplifies production technique, reduce production cost.
Technical scheme of the present invention is as follows: the method for producing high phosphoretic steel in the stove of a kind of 180t ore deposit, and its step comprises:
(1) be that the molten iron of more than 1250 DEG C is blended into converter by temperature, in stove, add quickened lime in the ratio of 10 ~ 20kg/t molten iron, the ratio of 2 ~ 4kg/t molten iron adds light dolomite, start to make high-phosphorus iron ore and lime rapid melting with 1.85 meters of rifle position oxygen blast 90 ~ 120s after the ratio of 15 ~ 30kg/t molten iron adds high-phosphorus iron ore;
(2) add quickened lime according to the ratio of 10-15kg/t molten iron again, at 1.7 meters of rifle position oxygen blast to 300 ~ 350s, then add high-phosphorus iron ore according to the ratio of 15-45kg/t molten iron, keep 1.8 meters of rifle position oxygen blast to 450s;
(3) finally rifle position to 1.65 meter is reduced, lime is supplemented in the ratio of 0 ~ 5kg/t molten iron depending on slag situation, continue blowing to terminate to 900 ~ 930s, finally adjusting terminal temperature is 1660 ~ 1690 DEG C, endpoint molten steel carbon content controls 0.08 ~ 0.1%, end temp, program tapping obtains high phosphoretic steel routinely;
In described molten iron, phosphorus content is 0.08 ~ 0.12%, and after desulfurization pre-treatment, molten steel sulfur content is 0.001 ~ 0.002%, molten iron silicon content>=0.4%; In described high-phosphorus iron ore, TFe content 35 ~ 45%, P content is 0.8 ~ 1.0%, S content be 0.02 ~ 0.05%, CaO content is 8 ~ 15%, SiO
2content is 10 ~ 20%.
Add lime and high-phosphorus iron ore to carry out oxygen blast and can maintain smelting process stability in batches, control basicity in stove, reduce dephosphorization rate, improve reaction efficiency, terminal point control carbon content, can lower molten steel and slag beneficiation in higher level, improves the recovery rate of phosphorus.
Typically, before being blended into converter with molten iron, temperature is 1300 DEG C, in molten iron, silicone content is calculate based on 0.4%, and it is 35 ~ 45kg/t molten iron that whole process adds high-phosphorus iron ore amount, as benchmark, when silicone content is fixed, enter stokehold temperature often reduce or improve 10 DEG C, high-phosphorus iron ore add-on reduces or increases by 1.5 ~ 2kg/t molten iron, when temperature is fixed, in molten iron, silicone content often increases or reduces 0.1%, and high-phosphorus iron ore add-on increases or reduces 4 ~ 6kg/t molten iron;
Be blended into the molten iron temperature before converter and silicone content according to molten iron, adjustment adds the amount of high-phosphorus iron ore, can maintain thermal equilibrium in stove.
Preferably, before being blended into molten iron, add steel scrap 2 ~ 4 tons.
Before being blended into molten iron, adding steel scrap can reducing impact to furnace bottom when being blended into molten iron.
Ratio >=95% of described high-phosphorus iron ore particle diameter 10-30mm.
Described oxygen blast adopts dynamic bottom blowing, and omnidistance bottom blowing strength maintenance is at 0.06 ~ 0.1Nm
3the level of/mint, rear churning time>=1 minute.
Point blows 1.5 meters, rifle position, is no more than twice.
Molten iron Intake Quantity 170t ~ 180t under the general working condition of the present invention, scrap ratio 8 ~ 20% is main slag material with quickened lime, and quickened lime consumption is 40-60kg/t molten iron, finishing slag amount 80-90kg/t molten iron.The high-phosphorus iron ore direct-reduction height phosphoretic steel that the present invention will add in converter, by reducing quickened lime consumption (< 40kg/t molten iron) thus making low alkalinity slag (CaO/SiO
2< 2.8), make the Fe3+ reduction recovery rate in ore reach more than 60%, dephosphorization rate controls the scope 45 ~ 55%, makes the phosphorus content of smelting endpoint molten steel be up to more than 0.085%.
The present invention is based on common converter smelting technology, converter reaction is entered with addition of the block raw ore of high-phosphorus iron ore, ferriferous oxide part direct-reduction in such ore deposit is entered molten steel, and by reducing basicity of slag, control the methods such as slag beneficiation and reduce dephosphorization rate, phosphorus content in effective raising smelting endpoint molten steel produces high phosphoretic steel, reach the object that mineral inferior make full use of, and directly save dark choosing, the contour phosphorus ore processing links of roasting, save energy, emissions reduction, reduce costs, improve enterprise Green, the ability of Sustainable development, there is very strong practicality.
Embodiment
The present invention is further illustrated below by way of specific embodiment:
Based on Wuhan Iron and Steel Plant factory 180t top and bottom combined blown converter, this converter is advanced computer control converter, generally molten iron Intake Quantity 170t ~ 180t, scrap ratio 8 ~ 20%, be main slag material with quickened lime, quickened lime consumption is 40-60kg/t steel, finishing slag amount 80-90kg/t steel.Carry out the condition of pretreatment desulfurizing at molten iron under, based on this type converter, the technical scheme of producing high phosphoretic steel with addition of high-phosphorus iron ore is as follows:
1) basic condition: it is 1250 ~ 1400 DEG C that molten iron enters stokehold temperature, be calculated in mass percent, conventional molten iron phosphorus content 0.08 ~ 0.12%, conventional molten steel sulfur content 0.001 ~ 0.002% after desulfurization pre-treatment, for balance adds thermal equilibrium after high-phosphorus iron ore, molten iron silicon content >=0.4% must be ensured.In high-phosphorus iron ore, TFe content 35 ~ 45%, P content is 0.8 ~ 1.0%, S content be 0.02 ~ 0.05%, CaO content is 8 ~ 15%, SiO
2content is 10 ~ 20%, and blowing total time is 900 ~ 930s.
2) iron and steel stock loads system: adding the endothermic effect after converter to balance high-phosphorus iron ore, should reduce the add-on of steel scrap as far as possible.Before being blended into molten iron, add steel scrap 2 ~ 4 tons according to furnace bottom situation (comprising bottom brick erosion condition, the exposed situation of gas permeable brick etc.), to the impact of furnace bottom when being blended into molten iron to reduce, be blended into molten iron afterwards.
Warm before being blended into converter with molten iron=1300 DEG C, silicone content is 0.4%, calculate based on the total add-on of steel scrap 3 tons, it is 35 ~ 45kg/t molten iron that whole process can add high-phosphorus iron ore amount, as benchmark, when silicone content is fixed, enter stokehold temperature often reduce or improve 10 DEG C, high-phosphorus iron ore add-on reduces or increases by 1.5 ~ 2kg/t molten iron, when temperature is fixed, silicone content often increases by 0.1%, and high-phosphorus iron ore add-on increases by 4 ~ 6kg/t molten iron.
3) smelting process control system: adopt single slag melting technique, first the first step blowing is carried out, namely first time slagging process, in stove, quickened lime is added in the ratio of 10 ~ 20kg/t molten iron before blowing starts, the ratio of 2-4kg/t molten iron adds light dolomite, the ratio of 15 ~ 30kg/t molten iron adds high-phosphorus iron ore (ratio >=95% of particle diameter 10-30mm), at once start higher rifle position (normally to open and blow 1.7 meters, rifle position, the present invention opens that to blow rifle position be about 1.85 meters) oxygen blast, ensure the rapid melting of high-phosphorus iron ore and lime, after oxygen blast starts 90s ~ 120s, add second batch quickened lime 10-15kg/t molten iron again, reduce rifle position to 1.7 meter, when continuing oxygen blast to 300-350s, rifle position is risen to about 1.8 meters again, the high-phosphorus iron ore adding for 1 ~ 2 time and remain and can add is divided in the ratio of 15-45kg/t molten iron, keep 1.8 meters of rifle position blowing to about 450s, reduce afterwards about rifle position to 1.65 meter, lime is supplemented in the ratio of 0 ~ 5kg/t molten iron depending on slag situation, continue blowing to terminate to 900 ~ 930s, whole process does not add any dissolving agent, finally adjust terminal temperature and composition, endpoint molten steel carbon content controls the level 0.08 ~ 0.1%, end temp is 1660 ~ 1690 DEG C, tap by normal procedure.
Bottom blowing system: adopt dynamic bottom blowing system, omnidistance bottom blowing strength maintenance is at 0.06 ~ 0.1Nm
3the level of/mint, rear churning time>=1 minute, to improve the speed of high-phosphorus iron ore fusing and reaction.
Point blowing degree: point blows 1.5 meters, rifle position, is no more than twice.
Other: the relevant institutions of other systems steel grade is routinely carried out.
Embodiment 1
Have 180t top and bottom combined blown converter for Wuhan Iron and Steel Plant factory, the technical scheme of producing high phosphoretic steel with addition of high-phosphorus iron ore is as follows:
In described molten iron, phosphorus content is 0.08%, and after desulfurization pre-treatment, molten steel sulfur content is 0.001%, and molten iron temperature is 1250 DEG C, and molten iron silicon content is 0.4%; In described high-phosphorus iron ore, TFe content 45%, P content is 0.8%, S content be 0.02%, CaO content is 15%SiO
2content is 20%.。
(1) first in converter, 2 tons of steel scraps are loaded, afterwards molten iron is blended into converter, in stove, add quickened lime in the ratio of 10kg/t molten iron, the ratio of 2kg/t molten iron adds light dolomite, start to make high-phosphorus iron ore and lime rapid melting with 1.85 meters of rifle position oxygen blast 90s after the ratio of 15kg/t molten iron adds high-phosphorus iron ore;
(2) add quickened lime according to the ratio of 10kg/t molten iron again, 1.7 meters of rifle position oxygen blast to 300s, rifle position is risen to 1.8 meters, then add high-phosphorus iron ore according to the ratio of 20kg/t molten iron, keep 1.8 meters of rifle position oxygen blast to 440s;
(3) finally reduce rifle position to 1.65 meter, no longer add lime, continue blowing and terminate to 900s, finally adjusting terminal temperature is 1690 DEG C, and endpoint molten steel carbon content controls 0.1%, and program tapping obtains high phosphoretic steel 1 routinely.
Bottom blowing system: adopt dynamic bottom blowing system, omnidistance bottom blowing strength maintenance is at 0.1Nm
3the level of/mint, rear churning time 2 minutes, to improve the speed of high-phosphorus iron ore fusing and reaction.
Point blowing degree: do not put and blow.
Other: the relevant institutions of other systems steel grade is routinely carried out.
Smelting endpoint basicity of slag is 2.32, and dephosphorization rate is 45%, and end phosphorus content is 0.057%, and final sulfur content is 0.0055%, calculates iron in ore reduction recovery rate and reaches 68%.
Embodiment 2
Have 180t top and bottom combined blown converter for Wuhan Iron and Steel Plant factory, the technical scheme of producing high phosphoretic steel with addition of high-phosphorus iron ore is as follows:
Described molten iron temperature is 1400 DEG C, and molten iron phosphorus content is 0.12%, and after desulfurization pre-treatment, molten steel sulfur content is 0.002%, and molten iron silicon content is 1.0%; In described high-phosphorus iron ore, TFe content is 35%, P content be 1.0%, S content be 0.06%, CaO content is 8%, SiO
2content is 10%.
(1) first in converter, 3 tons of steel scraps are loaded, afterwards molten iron is blended into converter, in stove, add quickened lime in the ratio of 20kg/t molten iron, the ratio of 4kg/t molten iron adds light dolomite, start to make high-phosphorus iron ore and lime rapid melting with 1.85 meters of rifle position oxygen blast 120s after the ratio of 30kg/t molten iron adds high-phosphorus iron ore;
(2) quickened lime is added according to the ratio of 15kg/t molten iron again, 1.7 meters of rifle position oxygen blast to 350s, rifle position is risen to 1.8 meters, then high-phosphorus iron ore is added according to the ratio of 25kg/t molten iron and 20kg/t molten iron at twice, twice joining day interval 30s, keeps 1.8 meters of rifle position oxygen blast to 460s;
(3) finally reduce rifle position to 1.65 meter, add lime in the ratio of 5kg/t molten iron, continue blowing and terminate to 930s, finally adjusting terminal temperature is 1660 DEG C, and endpoint molten steel carbon content controls 0.08%, and program tapping obtains high phosphoretic steel 2 routinely.
Bottom blowing system: adopt dynamic bottom blowing system, omnidistance bottom blowing strength maintenance is at 0.06Nm
3the level of/mint, rear churning time 1 minute, to improve the speed of high-phosphorus iron ore fusing and reaction.
Point blowing degree: point blows 1 time.
Other: the relevant institutions of other systems steel grade is routinely carried out.
Terminal smelting endpoint basicity of slag is 1.96, and because slag charge is comparatively large, dephosphorization rate is 55%, and end phosphorus content is 0.088%, and final sulfur content is 0.0050%, calculates iron in ore reduction recovery rate and reaches 60%.
Embodiment 3
Have 180t top and bottom combined blown converter for Wuhan Iron and Steel Plant factory, the technical scheme of producing high phosphoretic steel with addition of high-phosphorus iron ore is as follows:
Described molten iron temperature is 1399 DEG C, and molten iron phosphorus content is 0.11%, and after desulfurization pre-treatment, molten steel sulfur content is 0.0015%, and molten iron silicon content is 0.41%; In described high-phosphorus iron ore, TFe content is 40%, P content be 0.9%, S content be 0.04%, CaO content is 12%, SiO
2content is 12%.。
(1) first in converter, 2.5 tons of steel scraps are loaded, afterwards molten iron is blended into converter, in stove, add quickened lime in the ratio of 16kg/t molten iron, the ratio of 3kg/t molten iron adds light dolomite, start to make high-phosphorus iron ore and lime rapid melting with 1.85 meters of rifle position oxygen blast 110s after the ratio of 28kg/t molten iron adds high-phosphorus iron ore;
(2) quickened lime is added according to the ratio of 10kg/t molten iron again, 1.7 meters of rifle position oxygen blast to 310s, rifle position is risen to 1.8 meters, then high-phosphorus iron ore is added according to the ratio of 22kg/t molten iron and 15kg/t molten iron at twice, twice joining day interval 25s, keeps 1.8 meters of rifle position oxygen blast to 450s;
(3) finally reduce rifle position to 1.65 meter, no longer add into lime, continue blowing and terminate to 910s, finally adjusting terminal temperature is 1680 DEG C, and endpoint molten steel carbon content controls 0.09%, and program tapping obtains high phosphoretic steel 3 routinely.
Bottom blowing system: adopt dynamic bottom blowing system, omnidistance bottom blowing strength maintenance is at 0.08Nm
3the level of/mint, rear churning time 1.5 minutes, to improve the speed of high-phosphorus iron ore fusing and reaction.
Point blowing degree: point blows 2 times.
Other: the relevant institutions of other systems steel grade is routinely carried out.
Terminal smelting endpoint basicity of slag is 2.8, and dephosphorization rate is 52%, and end phosphorus content is 0.081%, and final sulfur content is 0.0052%, calculates iron in ore reduction recovery rate and reaches 62%.
Embodiment 4
Have 180t top and bottom combined blown converter for Wuhan Iron and Steel Plant factory, the technical scheme of producing high phosphoretic steel with addition of high-phosphorus iron ore is as follows:
Described molten iron temperature is 1290 DEG C, and molten iron phosphorus content is 0.105%, and after desulfurization pre-treatment, molten steel sulfur content is 0.0012%, and molten iron silicon content is 0.8%; In described high-phosphorus iron ore, TFe content is 40%, P content be 1.0%, S content be 0.04%, CaO content is 15%, SiO
2content is 11%.。
(1) first in converter, 2.8 tons of steel scraps are loaded, afterwards molten iron is blended into converter, in stove, add quickened lime in the ratio of 20kg/t molten iron, the ratio of 2.5kg/t molten iron adds light dolomite, start to make high-phosphorus iron ore and lime rapid melting with 1.85 meters of rifle position oxygen blast 100s after the ratio of 25kg/t molten iron adds high-phosphorus iron ore;
(2) quickened lime is added according to the ratio of 12kg/t molten iron again, 1.7 meters of rifle position oxygen blast to 320s, rifle position is risen to 1.8 meters, then high-phosphorus iron ore is added according to the ratio of 20kg/t molten iron and 15kg/t molten iron at twice, twice joining day interval 35s, keeps 1.8 meters of rifle position oxygen blast to 455s;
(3) finally reduce rifle position to 1.65 meter, add lime in the ratio of 4kg/t molten iron, continue blowing and terminate to 925s, finally adjusting terminal temperature is 1670 DEG C, and endpoint molten steel carbon content controls 0.09%, and program tapping obtains high phosphoretic steel 4 routinely.
Bottom blowing system: adopt dynamic bottom blowing system, omnidistance bottom blowing strength maintenance is at 0.09Nm
3the level of/mint, rear churning time 1.5 minutes, to improve the speed of high-phosphorus iron ore fusing and reaction.
Point blowing degree: do not put and blow.
Other: the relevant institutions of other systems steel grade is routinely carried out.
Terminal smelting endpoint basicity of slag is 2.1, and dephosphorization rate is 48%, and end phosphorus content is 0.086%, and final sulfur content is 0.0053%, calculates iron in ore reduction recovery rate and reaches 64%.
Embodiment 5
Have 180t top and bottom combined blown converter for Wuhan Iron and Steel Plant factory, the technical scheme of producing high phosphoretic steel with addition of high-phosphorus iron ore is as follows:
Described molten iron temperature is 1330 DEG C, and molten iron phosphorus content is 0.095%, and after desulfurization pre-treatment, molten steel sulfur content is 0.0018%, and molten iron silicon content is 0.55%; In described high-phosphorus iron ore, TFe content is 40%, P content be 0.95%, S content be 0.05%, CaO content is 14%, SiO
2content is 13%.。
(1) first in converter, 2.3 tons of steel scraps are loaded, afterwards molten iron is blended into converter, in stove, add quickened lime in the ratio of 16kg/t molten iron, the ratio of 2.5kg/t molten iron adds light dolomite, start to make high-phosphorus iron ore and lime rapid melting with 1.85 meters of rifle position oxygen blast 115s after the ratio of 22kg/t molten iron adds high-phosphorus iron ore;
(2) quickened lime is added according to the ratio of 12kg/t molten iron again, 1.7 meters of rifle position oxygen blast to 335s, rifle position is risen to 1.8 meters, then high-phosphorus iron ore is added according to the ratio of 18kg/t molten iron and 12kg/t molten iron at twice, twice joining day interval 20s, keeps 1.8 meters of rifle position oxygen blast to 452s;
(3) finally reduce rifle position to 1.65 meter, add lime in the ratio of 1kg/t molten iron, continue blowing and terminate to 918s, finally adjusting terminal temperature is 1675 DEG C, and endpoint molten steel carbon content controls 0.096%, and program tapping obtains high phosphoretic steel 5 routinely.
Bottom blowing system: adopt dynamic bottom blowing system, omnidistance bottom blowing strength maintenance is at 0.075Nm
3the level of/mint, rear churning time 1.5 minutes, to improve the speed of high-phosphorus iron ore fusing and reaction.
Point blowing degree: do not put and blow.
Other: the relevant institutions of other systems steel grade is routinely carried out.
Terminal smelting endpoint basicity of slag is 2.46, and dephosphorization rate is 49%, and end phosphorus content is 0.074%, and final sulfur content is 0.0048%, calculates iron in ore reduction recovery rate and reaches 62%.
Claims (6)
1. produce a method for high phosphoretic steel in the stove of 180t ore deposit, its step comprises:
(1) be that the molten iron of more than 1250 DEG C is blended into converter by temperature, in stove, add quickened lime in the ratio of 10 ~ 20kg/t molten iron, the ratio of 2 ~ 4kg/t molten iron adds light dolomite, start to make high-phosphorus iron ore and lime rapid melting with 1.85 meters of rifle position oxygen blast 90 ~ 120s after the ratio of 15 ~ 30kg/t molten iron adds high-phosphorus iron ore;
(2) add quickened lime according to the ratio of 10-15kg/t molten iron again, at 1.7 meters of rifle position oxygen blast to 300 ~ 350s, then add high-phosphorus iron ore according to the ratio of 15-45kg/t molten iron, keep 1.8 meters of rifle position oxygen blast to 450s;
(3) finally rifle position to 1.65 meter is reduced, lime is supplemented in the ratio of 0 ~ 5kg/t molten iron, continue blowing to terminate to 900 ~ 930s, finally adjusting terminal temperature is 1660 ~ 1690 DEG C, endpoint molten steel carbon content controls 0.08 ~ 0.1%, end temp, program tapping obtains high phosphoretic steel routinely;
In described molten iron, phosphorus content is 0.08 ~ 0.12%, and after desulfurization pre-treatment, molten steel sulfur content is 0.001 ~ 0.002%, molten iron silicon content >=0.4%; In described high-phosphorus iron ore, TFe content is 35 ~ 45%, P content be 0.8 ~ 1.0%, S content be 0.02 ~ 0.05%, CaO content is 8 ~ 15%.
2. in the stove of 180t ore deposit according to claim 1, produce the method for high phosphoretic steel, it is characterized in that: before being blended into converter with molten iron, temperature is 1300 DEG C, in molten iron, silicone content is calculate based on 0.4%, it is 35 ~ 45kg/t molten iron that whole process adds high-phosphorus iron ore amount, as benchmark, when silicone content is fixed, enter stokehold temperature often reduce or improve 10 DEG C, high-phosphorus iron ore add-on reduces or increases by 1.5 ~ 2kg/t molten iron, when temperature is fixed, in molten iron, silicone content often increases by 0.1%, and high-phosphorus iron ore add-on increases by 4 ~ 6kg/t molten iron.
3. produce the method for high phosphoretic steel in the stove of 180t ore deposit according to claim 1, it is characterized in that: before being blended into molten iron, add steel scrap 2 ~ 4 tons.
4. produce the method for high phosphoretic steel in the stove of 180t ore deposit according to claim 1, it is characterized in that: ratio >=95% of described high-phosphorus iron ore particle diameter 10-30mm.
5. produce the method for high phosphoretic steel in the stove of 180t ore deposit according to claim 1, it is characterized in that: described oxygen blast adopts dynamic bottom blowing, omnidistance bottom blowing strength maintenance is at 0.06 ~ 0.1Nm
3the level of/mint, rear churning time>=1 minute.
6. produce the method for high phosphoretic steel in the stove of 180t ore deposit according to claim 1, it is characterized in that: point blows 1.5 meters, rifle position, is no more than twice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410570349.9A CN104294000B (en) | 2014-10-23 | 2014-10-23 | The method producing high phosphoretic steel in the stove of 180t ore deposit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410570349.9A CN104294000B (en) | 2014-10-23 | 2014-10-23 | The method producing high phosphoretic steel in the stove of 180t ore deposit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104294000A true CN104294000A (en) | 2015-01-21 |
| CN104294000B CN104294000B (en) | 2016-08-24 |
Family
ID=52313946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410570349.9A Active CN104294000B (en) | 2014-10-23 | 2014-10-23 | The method producing high phosphoretic steel in the stove of 180t ore deposit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104294000B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1789464A (en) * | 2004-12-10 | 2006-06-21 | 涟源钢铁集团有限公司 | Method for smelting phosphor-containing steel |
| CN102776313A (en) * | 2012-08-20 | 2012-11-14 | 武汉钢铁(集团)公司 | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter |
| CN103361462A (en) * | 2013-08-02 | 2013-10-23 | 武汉钢铁(集团)公司 | Control method for low-carbon high-phosphorus steel tapping in converter |
| CN104046718A (en) * | 2014-06-25 | 2014-09-17 | 首钢总公司 | Smelting process of high-phosphorus molten steel |
-
2014
- 2014-10-23 CN CN201410570349.9A patent/CN104294000B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1789464A (en) * | 2004-12-10 | 2006-06-21 | 涟源钢铁集团有限公司 | Method for smelting phosphor-containing steel |
| CN102776313A (en) * | 2012-08-20 | 2012-11-14 | 武汉钢铁(集团)公司 | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter |
| CN103361462A (en) * | 2013-08-02 | 2013-10-23 | 武汉钢铁(集团)公司 | Control method for low-carbon high-phosphorus steel tapping in converter |
| CN104046718A (en) * | 2014-06-25 | 2014-09-17 | 首钢总公司 | Smelting process of high-phosphorus molten steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104294000B (en) | 2016-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103525972B (en) | Converter vanadium-extracting method of molten iron containing vanadium | |
| CN102776313B (en) | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter | |
| CN101775451A (en) | Blast-furnace smelting method for vanadium titano-magnetite | |
| CN102168160B (en) | Converter steelmaking technology for directly reducing-alloying manganese ore | |
| CN103146873B (en) | The semi-steel making slagging method of enrichment sludge ball and semi-steel making | |
| CN103642971B (en) | Improve method and the Semi-steel making method of semi-steel making endpoint carbon content | |
| CN101407852A (en) | Method for extracting vanadium slag from ultra-low vanadium-containing molten iron by using converter | |
| CN103555879B (en) | Control method for reducing total iron content of SPHC (steel plate heat commercial) final slag | |
| CN101696460B (en) | Process and device for dual continuous steel making with iron-containing material rotary hearth furnace | |
| CN103352101A (en) | Low-cost smelting technology of converter | |
| CN103710543A (en) | Method for producing low-carbon high-silicon manganese-silicon alloy from manganese-containing industrial waste slag through two-step method | |
| CN104195290A (en) | Molten steel dephosphorization agent and molten steel dephosphorization refining method | |
| CN104060021B (en) | A kind of low silicon low temperature vanadium-bearing hot metal vanadium extraction by converter blowing technique | |
| CN102041400B (en) | Process and equipment for producing high-content manganese silicon alloy from low-grade ferromanganese ore | |
| CN104060020B (en) | A kind of dephosphorization method for making steel improving converter terminal molten steel Fe content | |
| CN103409595B (en) | Dephosphorization and steel-making method of vanadium-containing molten iron | |
| CN104789732A (en) | Method for slagging in semisteel steelmaking converter | |
| CN104017932A (en) | Converter double-slag steelmaking method | |
| CN102876830B (en) | Converter smelting method for high-phosphorus steel for containers | |
| CN103725877A (en) | Method for recycling converter steelmaking dust | |
| CN103966389A (en) | Method of utilizing semisteel to smelt high-carbon steel | |
| CN103773916B (en) | A kind of method of converter high phosphorus tapping Smelting Weathering Steel | |
| CN103215408A (en) | Method for converter steelmaking by adding steel slag blocks | |
| CN101956035A (en) | Iron-containing material slag bath smelting reduction steelmaking technical method and device | |
| CN107385213A (en) | A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome |
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 | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170726 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 15 Wuchang, Wuhan Friendship Avenue, No. 999, block A, layer (Wuhan Iron and steel science and technology innovation department), No. 430080, Patentee before: Wuhan Iron & Steel (Group) Corp. |
|
| TR01 | Transfer of patent right |