CN114686643A - Composite slagging heat-compensating agent for smelting converter with large scrap steel ratio and preparation and use methods thereof - Google Patents

Composite slagging heat-compensating agent for smelting converter with large scrap steel ratio and preparation and use methods thereof Download PDF

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Publication number
CN114686643A
CN114686643A CN202210306139.3A CN202210306139A CN114686643A CN 114686643 A CN114686643 A CN 114686643A CN 202210306139 A CN202210306139 A CN 202210306139A CN 114686643 A CN114686643 A CN 114686643A
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converter
smelting
heat
slagging
agent
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CN114686643B (en
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欧阳德刚
沈继胜
孙伟
朱万军
赵元
周甫
肖邦志
苏尚飞
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025—Adding carbon material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention relates to the technical field of converter steelmaking, and discloses a composite slagging heat-compensating agent for smelting large scrap ratio of a converter, which is prepared from the following raw materials in percentage by weight: 55-60% of silicon-aluminum-calcium-carbon alloy, 10-15% of sintered calcium aluminate, 5-10% of wood charcoal, 5-10% of sintered return ores, 10-15% of manganese ores, 5-10% of light-burned dolomite and 0.3-0.5% of sodium stearate. The invention also discloses a preparation method and a use method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter. The composite slagging heat-compensating agent for smelting the large steel scrap ratio of the converter and the preparation and use methods thereof have the advantages of stable oxygen blowing combustion of the converter, high heat-compensating efficiency, low heat-compensating cost, high converter slagging speed, high dephosphorization efficiency, no increase of the contents of harmful elements and residual elements in molten steel and achieve the purpose of high-quality, high-efficiency, low-cost, low-carbon and green smelting of the large steel scrap ratio of the converter.

Description

Composite slagging heat-compensating agent for smelting converter with large scrap steel ratio and preparation and use methods thereof
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a composite slagging heat-supplementing agent for converter large-scrap-ratio smelting and a preparation and use method thereof.
Background
For the iron and steel combination enterprises, how to reduce the molten iron ratio of the converter and improve the scrap steel ratio is an urgent need for the low-carbon green development of the enterprises. Because the increase of the ratio of the converter to the scrap steel means that the amount of the molten iron entering the converter and the reduction of the physical heat and the chemical heat brought by the molten iron will result in insufficient heat for the converter steelmaking, and in order to ensure the smooth operation of the smelting process, the heat supplement can be carried out by adding a heating agent or raising the temperature by excessively blowing oxygen; the excessive oxygen blowing will cause the over oxidation of molten steel, the consumption of iron and steel materials and alloy consumption, which not only affects the quality of molten steel, but also causes the increase of production cost. Therefore, the technology of adding a heating agent into a converter to carry out heat compensation is rapidly developed, the heating agents of the converter such as a carbonaceous heating agent, a silicon carbide heating agent, a silicon heating agent, an aluminum heating agent and the like are developed successively, but the influence of the addition of different heating agents on the steelmaking of the converter is different, wherein the carbonaceous heating agent does not increase the slag amount, but is easy to be pumped away by a high-speed airflow of a fan of the converter due to light specific gravity, so that the heating effect is poor, and the slagging capacity is poor under the condition of low molten iron [ Si ]; the silicon carbide and the siliceous exothermic agent have high heat productivity, the generated product is an acidic oxide, and in order to ensure the alkalinity of the slag, enough alkaline oxide must be added, so that the slag quantity is increased, the heat loss is increased, the heating capacity of the siliceous exothermic agent is weakened, and the price is high. The aluminum heating agent has large heating capacity, the generated product is neutral aluminum oxide, the influence on the furnace lining of the converter is not large, but the melting point of metal aluminum is low, the metal aluminum is easy to oxidize, the combustion speed is high, the effective heat supplementing time is short, and the price of the heating agent is high, so that the temperature control in the steelmaking process is difficult, and the production cost is increased rapidly.
Aiming at the defects of the conventional exothermic agent, domestic scholars invent a series of composite exothermic agents for converter steelmaking from the aspects of improving the heat supplementing efficiency of the converter, reducing the cost of the exothermic agent, reducing the environmental pollution and the like, and the related typical patents are as follows:
chinese patent (published: 2004, 08 and 25 months and publication number: CN1523121A) discloses a carbon-iron exothermic agent for steelmaking, a production process and a use method thereof, the carbon-iron exothermic agent is composed of a carbon-containing material, an additive, a stabilizer, a specific gravity regulator and a binder, wherein the weight percentage of each component is as follows: 0-10% of additive, 0-15% of stabilizer, 1-20% of specific gravity regulator, 2-16% of binder and the balance of carbon-containing material. Wherein, the carbonaceous material is selected from one of coke, coal, graphite, asphalt, petroleum coke and electrode powder, the additive is selected from one of metal aluminum, silicon and calcium, the stabilizer is selected from one of silicon carbide, silicon iron, silicon-calcium alloy, limestone and dolomite, the specific gravity regulator is selected from one of iron particles, iron slag particles, iron oxide skin and scrap iron, and the binder is selected from one of water glass, numerical value, asphalt, pond slag, paper pulp and water. The exothermic agent is solid particles with a certain shape, and the specific gravity of the exothermic agent is 3.5-4.5 g/cm3After the exothermic agent is added into a converter, the carbon-iron exothermic agent is pulverized at the steelmaking temperature, and is fully oxidized and combusted under the action of strong oxygen flow to generate oxide or dioxide and slag phase thereof, and simultaneously, the heat is released and absorbed by the waste steel or molten steel, thereby achieving the purpose of melting the waste steel or heating the molten steel; the main heating element of the heating agent is carbon, the product is mainly flue gas, the slag amount is small, the adverse effect on the converter lining is avoided, and the metal loss is reduced; the adding mode can be added into the converter along with the scrap steel, and can also be stored in a high-level storage bin to be added in batches in the steelmaking process without changing the prior process; the inhibiting additive for delaying the carbon reaction is added into the exothermic agent, and the granular finished product is added into the furnace without causing the local accumulation of the exothermic agent, thereby avoiding the hidden danger of splashing caused by the overlarge local reaction strength in the furnace. By applying the mixture in a 100-ton converter, 3Kg/t of the mixture is addedSteelHowever, the unit consumption of molten iron reaches 850Kg/tSteelIncreasing the steel yield by 10-15% under the same molten iron condition; compared with a siliceous heat generating agent, the lime consumption is reduced by 3 to 5Kg/t Steel. As can be seen from the disclosure of the patent document, the patent fails to describe the positive effects of the additives and the stabilizers, and the addition amount of the additives and the stabilizers is wide in variation range and can even not be added, but the disclosed additives are high-calorific-value metal aluminum, silicon and calcium, the disclosed stabilizers are high-calorific-value alloy materials, silicon carbide and high-alkalinity endothermic decomposed limestone and dolomite, and therefore, the additives and the stabilizers are improperly controlled, and the chemical heat and heat supplementing effects of the heating agent and the alkalinity of slag are seriously influenced. This may also be the main reason why large-scale applications are not currently seen.
Chinese patent (published: 2011, 03 and 23 days, publication number: CN101988137A) discloses a heating agent for converter low-calorific-value molten iron, which is a converter heating agent composed of a carbonaceous material, a siliceous material, bauxite, iron particles, scrap iron, a binder and the like, and comprises the following components in percentage by weight: 31-44% of a carbonaceous material; 35-48% of a siliceous material; 6-14% of bauxite; 4-10% of iron particles or/and scrap iron; 4-8% of a binder; the bulk specific gravity of the heat generating agent is 2.2 to 3.5 tons/m3. The invention aims at low-silicon and low-temperature molten iron with low calorific value, namely: silicon content [ Si ] of charged molten iron]Not more than 0.25 percent, or the temperature of molten iron is not more than 1300 ℃, graphite and electrode powder are taken as heating elements, and the amount of slag is not increased in the smelting process of a converter; ferrosilicon and silicon carbide are used as high-calorific-value heating elements to provide SiO2 content required by slag melting; iron particles and scrap iron are used as specific gravity additives, so that the specific gravity of the silicon-carbon spheres is greater than that of the slag, the silicon-carbon spheres are added into a converter, the silicon-carbon spheres can directly enter molten steel and are prevented from being drawn away by a converter fan; and 6-14% of bauxite is added, so that the content of Al2O3 in the slag is controlled to be 2.5-4.5%, lime dissolution is accelerated, slag melting at the early stage of blowing is promoted, and the phosphorus and sulfur removal capability of the slag is improved. And is applied in the actual production, not only the heat supplement of the converter is realized, but also the TFe content of the converter final slag is reduced by more than 2.5 percent, the dephosphorization rate of the converter is improved by more than 2 percent, and the aim of reducing the Free [ O ] of the converter molten steel is achieved]And the purity of the molten steel is improved. However, the utilization of a large amount of high-heating-value heating elements of ferrosilicon and silicon carbide leads to high cost of the heating agent and large slag amount, reduces the alkalinity of slag and increases the lime consumption of the converter.
In addition, domestic scholars achieve the purposes of reducing the cost of the exothermic agent and reducing environmental pollution by recycling waste resources, and form a series of patent technologies, such as:
chinese patent (published: 09/15/2018, publication number: CN108165697A) discloses a heating agent for converter steelmaking and a production method thereof, wherein the heating agent is composed of industrial silicon powder, AD powder and iron oxide raw materials, wherein the weight percentage of the industrial silicon powder is 40-60%, the weight percentage of the AD powder is 20-40%, the weight percentage of the iron oxide raw materials is 10-30%, and the balance is binder and additive. Wherein the industrial silicon powder is produced by cutting monocrystalline silicon for semiconductor industry and polycrystalline silicon for solar cells, the granularity is not more than 3mm, and the content of metal silicon is 70-95%; the AD powder is a slag generated in the aluminum smelting process, the granularity is not more than 3mm, and the content of metallic aluminum is 5-35 percent; the additive accounts for 0 to 15 percent of the total weight of the heating agent, and consists of at least one of silicon carbide, metal aluminum powder, ferrosilicon powder and graphite, and the granularity of the iron oxide is not more than 5 mm; the adhesive accounts for 0 to 10 percent of the total weight of the heat generating agent and is composed of at least one of water glass, cement, starch, flake caustic soda, 801 glue, yellow dextrin and CMC. Mixing industrial silicon powder, AD powder and iron oxide, adding an additive and a binder, fully stirring and uniformly mixing, and pressing into a spherical body by using a high-pressure double-roller ball press to obtain the required heating agent. The heat supplement amount of the heating agent is improved by introducing metal silicon in industrial silicon powder and metal aluminum high-heat-productivity substances in AD powder, an oxygen source is provided for the oxidation of the metal silicon and the metal aluminum by introducing ferric oxide, the specific gravity of the heating agent is increased, and the possibility that the heating agent is directly removed by dust removal in use is avoided. According to the patent disclosure, the main heating elements of the exothermic agent are metal silicon and metal aluminum, which still cause the defects of increasing the slag amount and reducing the alkalinity of the converter, and meanwhile, the use of a large amount of particle raw materials greatly increases the difficulty of compression molding of the spheres of the exothermic agent, reduces the strength of the spheres and causes the crushing and pulverization of the exothermic agent in the processes of transportation and addition.
In addition, Chinese patent (published: 2012: 07/04/h, publication number: CN102534091A) discloses a heat generating agent for steelmaking and a production method thereof, wherein the heat generating agent consists of 15-50% of photovoltaic cutting waste, 45-85% of industrial silicon carbide, an additive and a binder, the granularity of the photovoltaic cutting waste is not more than 3mm, the content of metal silicon powder is not less than 15%, and the content of silicon carbide is not less than 55%; the granularity of the silicon carbide is not more than 10mm, and the SiC content is 40-90 percent; the additive is composed of at least one of silicon powder, metal aluminum powder, ferrosilicon powder and graphite; the binder is composed of at least one of water glass, cement, starch, flake caustic soda, 801 glue and yellow dextrin. The main components of the exothermic agent are SiC, fixed C and metallic silicon, which are good reducing agents. During smelting, the oxygen blown into the furnace oxidizes the oxygen to release heat, and the iron oxide in the slag is reduced, so that the iron loss is reduced while the heat is released, the yield of molten iron is improved, and the smelting cost is reduced.
Chinese patent (published: 2020, 09/08, publication No. CN111635979A) discloses a low-cost heating agent for a converter and a production method thereof, wherein industrial silicon powder and AD powder are used as the heating agent of main heating materials, at least one of aluminum powder, silicon carbide and carbon powder is used as an additive, at least one of cement, starch and water glass is used as a binder, the heating effect of the heating agent reaches and exceeds that of a ferrosilicon heating agent, and the cost is reduced by 50%.
The two patents mainly adopt metal silicon, metal aluminum, silicon carbide and carbon materials as main heating components for compounding, the cost of the heating agent is reduced through the utilization of industrial silicon powder and AD powder, and the high-efficiency reutilization of industrial solid wastes is realized, but the defects of increased converter slag amount, reduced alkalinity and increased lime consumption caused by silicon dioxide and aluminum oxide formed after the oxidation combustion of the heating components such as the metal silicon, the metal aluminum, the silicon carbide and the like are still caused, and meanwhile, the fluctuation of the content of heating elements in industrial solid waste secondary resources of the industrial silicon powder and the AD powder is large, which is also the main reason that related invention patents taking the industrial silicon powder and the AD powder as main heating agent components are difficult to obtain the approval of users and popularize and apply; as for the heating agent mainly comprising carbon components such as the coke briquette, the anthracite and the like, the application of the heating agent in the smelting of high-added-value variety steel is restricted due to the high content of acidic ash and harmful elements, and the adaptability and the application prospect of the converter smelting of the heating agent containing the coke briquette and the anthracite components are greatly reduced; in addition, a large amount of acidic combustion products in the exothermic agent are generated, so that the converter slag amount is large, the lime consumption is high, the slag forming process is slow, the earlier-stage dephosphorization of the converter is not facilitated, and the efficient smelting of the converter is restricted.
It can be seen from the above analysis that it is necessary to develop the research of the multifunctional novel composite heating agent with high heat supplementing and rapid slagging functions under the condition of large steel scrap ratio from the full play of the high heat value effect of the components of metal silicon, metal aluminum, silicon carbide and the like and the control of the adverse effect of the heating agent on converter slagging as a breakthrough, so as to improve the heat supplementing efficiency, slagging speed, dephosphorization rate and the like of the converter, and achieve the purpose of green and low-carbon smelting of the converter with high steel scrap ratio, high quality, high efficiency and low cost. However, no technical data report related to the exothermic agent with the dual functions of efficient heat compensation and rapid slagging is found at present.
Disclosure of Invention
The invention aims to provide a composite slagging heat-compensating agent for smelting large steel scrap ratio of a converter and a preparation and use method thereof, aiming at the defects of the technology, and the composite slagging heat-compensating agent has the advantages of stable converter oxygen blowing combustion, high heat-compensating efficiency, low heat-compensating cost, high converter slagging speed, high dephosphorization efficiency, no increase of harmful elements and residual element content of molten steel, and achieves the purpose of high-quality, high-efficiency, low-cost, low-carbon and green smelting of large steel scrap ratio of the converter.
In order to achieve the purpose, the composite slagging heat-compensating agent for smelting the large-scrap-ratio converter, which is designed by the invention, is prepared from the following raw materials in percentage by weight: 55-60% of silicon-aluminum-calcium-carbon alloy, 10-15% of sintered calcium aluminate, 5-10% of wood charcoal, 5-10% of sintered return ores, 10-15% of manganese ores, 5-10% of light-burned dolomite and 0.3-0.5% of sodium stearate.
Preferably, the silicon-aluminum-calcium-carbon alloy consists of Si, Al, Ca, C and Fe, and the impurity element is P, S, wherein the weight percentage content ranges of Si, Al, Ca and C are as follows: 35-45% of Si, 5-12% of Al, 9-19% of Ca, 4-12% of C, and the weight percentage content range of metal Fe is as follows: 15-25%, wherein the content of the impurity element P, S in percentage by weight is as follows: p is less than or equal to 0.05 percent and S is less than or equal to 0.1 percent.
Preferably, the sintered calcium aluminate has a composition of 12CaO 7Al2O3，12CaO· 7Al2O3The content is more than or equal to 85 percent.
Preferably, the wood charcoal is a charcoal material obtained by distilling raw materials of wattle wood, sawdust, wood block, coconut shell, fruit shell, cotton stalk or rice hull.
Preferably, the sintered return ores are undersize sintered ores obtained after crushing and screening of steel mill sintered ores.
Preferably, the manganese ore is pyrolusite or psilomelane.
A preparation method of the composite slagging heat-compensating agent for smelting the large steel scrap ratio of the converter comprises the following steps:
A) preparing raw materials;
B) respectively crushing the silicon-aluminum-calcium-carbon alloy, the wood charcoal and the sintered return ores, and screening and blanking by a screen with 5mm meshes to obtain natural-grade granules with the grain size of less than or equal to 5 mm; respectively carrying out ball milling on the sintered calcium aluminate, the manganese ore and the light-burned dolomite, and screening and blanking by using a 150-mesh sieve to obtain powder with the particle size smaller than 150 meshes; rolling sodium stearate, selecting a 100-mesh screen to sieve and discharge the materials to obtain powder with the particle size less than 100 meshes;
C) weighing the raw materials treated in the step B) according to the weight percentage, adding the raw materials into a vertical stirrer, and stirring and mixing for 10-15 minutes to obtain a roller-milled mixture;
D) and C), adding the roller-milled mixture obtained in the step C) into a high-strength double-roller ball press, performing dry pressing to obtain a spheroid, wherein the diameter of the spheroid is 25-50 mm, and packaging and warehousing the spheroid in a sealing packaging mode to obtain the converter large scrap steel ratio smelting composite slagging heat-compensating agent.
A use method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
1) according to the chemical composition, the temperature, the molten iron amount and the scrap steel amount of the molten iron fed into the converter, a converter smelting static model is adopted to calculate the heat balance and the material balance of the converter, and the adding amount of the composite slagging heat-supplementing agent and the adding amount of the scrap steel for smelting the large scrap steel ratio of the converter under the condition of smelting the converter with the large scrap steel ratio of the converter are determined according to the calculation principle that the adding amount of the composite slagging heat-supplementing agent corresponds to 4-6 Kg of the adding amount of the scrap steel for smelting the large scrap steel ratio of the converter with 1Kg of the converter;
2) adding a bottom-padding slagging flux into a converter after tapping and deslagging to pad the converter, preventing the bottom of the converter from being damaged by smashing when adding waste steel, wherein the adding amount of the bottom-padding slagging flux is 5-10 Kg/t of steel, then adding the waste steel according to the adding amount of the waste steel obtained by calculating in the step 1), then adding a composite slag-making and heat-supplementing agent for smelting the large-waste-steel ratio of the converter through a material bin, feeding the converter into a lance to start blowing after adding molten iron, then adding a second batch of slagging flux, blowing until the blowing is stopped until 30-35% of the total oxygen consumption of the blowing process determined according to a static model for smelting the converter, adding a third batch of slagging flux to continue blowing until the temperature of the auxiliary lance is measured and sampled, then blowing according to a dynamic model for smelting according to the temperature measurement and sampling result of the auxiliary lance until the converter stops blowing, and then carrying out the converter, wherein the adding amount of the composite slag-making and heat-supplementing agent for smelting the large-steel ratio of the converter obtained by calculating in the step 1) is the adding amount of the composite slag-making and heat-supplementing agent for smelting the large-steel ratio of the converter, the sum of the addition amount of the second batch of slagging flux and the bottom-up slagging flux accounts for 70-80% of the weight of all slagging fluxes.
The principle of the invention is as follows:
the corresponding alloy element oxides are formed in the converter heat supplementing process through high-heat value Si, Al and Ca alloy elements in the silicon-aluminum-calcium-carbon alloy, the formation and the outward heat loss of high-temperature flue gas are avoided, the heat transfer speed in the heat supplementing process of the heating agent and the converter heat supplementing efficiency are improved, meanwhile, various high-activity oxides formed by oxygen blowing combustion of various alloy elements are increased, the material composition of a converter slagging material and the formation conditions of low-melting-point composite oxides are increased, and the formation speed of the composite oxides and the converter slagging speed are promoted by high-activity oxidation products.
Through the compounding of a proper amount of C alloy elements and wood carbon in the silicon-aluminum-calcium-carbon alloy, the oxidation combustion speed and the heat-supplementing aging effect of the silicon-aluminum-calcium-carbon alloy in the converter are delayed, the smelting temperature system of the converter is improved, and the dephosphorization efficiency is improved.
CaO produced by oxidizing Ca alloy elements in the silicon-aluminum-calcium-carbon alloy improves the alkalinity of combustion products of the heat-compensating agent, reduces the consumption of a converter flux and promotes the slagging process of the converter.
By using low melting point 12 CaO.7 Al2O3The composite addition of the sintered calcium aluminate and the light-burned dolomite which are main components not only improves the slagging and slagging speed of the converter, but also improves the basicity of the formed slag, promotes the slag-metal reaction of converter smelting, simultaneously improves the basicity and MgO content of the slag, and reduces the consumption of a flux and the corrosion speed of a furnace lining.
The preparation method has the advantages that the melting point of converter slagging is reduced, the slagging and slagging time is shortened, the thermodynamic and kinetic conditions of converter dephosphorization are improved, the dephosphorization efficiency is improved, and meanwhile, the combustion speed and the combustion efficiency of carbon materials in the heat supplement agent are improved and the heat supplement effect of the heat supplement agent is improved through the catalytic action of iron oxide and manganese oxide in the sintered return ores and manganese ores on the combustion of the carbon materials.
The introduction of sodium stearate improves the waterproofness of the large scrap steel of the converter compared with the smelting composite slagging heat-supplementing agent, avoids moisture absorption and dampness of the heat-supplementing agent in storage and transportation, improves the thermodynamics and kinetics of slagging of the converter and improves the slagging speed by medium-temperature decomposition and stirring of sodium stearate.
Compared with the prior art, the invention has the following advantages:
1. the converter large scrap steel has the characteristics of high oxidation combustion heat value, low content of harmful elements, low cost, convenient preparation, promotion of converter slagging and slagging, improvement of converter dephosphorization efficiency and the like compared with the smelting composite slagging heat-supplementing agent;
2. the slag-removing agent is applied as a converter smelting heat-supplementing agent, has the advantages of stable converter oxygen blowing combustion, high heat-supplementing efficiency, low heat-supplementing cost, high converter slagging speed, high dephosphorization efficiency and no increase of harmful elements and residual element content of molten steel, and achieves the aim of high-quality, high-efficiency, low-cost, low-carbon and green smelting of large waste steel of a converter;
3. the preparation and use methods of the composite slagging heat-compensating agent for smelting the large steel scrap ratio of the converter ensure the preparation quality and the application effect of the composite slagging heat-compensating agent for smelting the large steel scrap ratio of the converter, realize the synchronous implementation of the high-efficiency heat compensation and the rapid slagging of the converter through industrial tests, achieve the comprehensive aims of reducing the consumption of the heat-compensating agent and a flux of the converter, improving the steel scrap ratio and the metal yield of the converter, shortening the smelting period, stabilizing the tapping quality and the like, and meet the production requirements of the high-quality, high-efficiency, low-cost, low-carbon and green smelting of the large steel scrap ratio of the converter.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
A composite slagging heat-compensating agent for smelting of converter large scrap steel ratio is prepared from the following raw materials in percentage by weight: 55% of silicon-aluminum-calcium-carbon alloy, 10% of sintered calcium aluminate, 8% of wood charcoal, 6% of sintered return ores, 13% of manganese ores, 7.5% of light-burned dolomite and 0.5% of sodium stearate.
The silicon-aluminum-calcium-carbon alloy consists of Si, Al, Ca, C and Fe, wherein the impurity element is P, S, and the weight percentage content ranges of the Si, the Al, the Ca and the C are as follows: si, 35%, Al, 12%, Ca, 18%, C, 9%, and the content range of metal Fe by weight percent is: 25 percent, and the content range of the impurity element P, S by weight percent is as follows: p is less than or equal to 0.05 percent and S is less than or equal to 0.1 percent.
The sintered calcium aluminate contains 12CaO 7Al2O3，12CaO·7Al2O3Is 85% by weight.
The wood charcoal is a charcoal material obtained by distilling a viter material serving as a raw material, the sintered return ore is undersize sintered ore obtained by crushing and screening steel mill sintered ore, the manganese ore is pyrolusite, the light calcined dolomite is a commercially available product, and the sodium stearate is industrial-grade sodium stearate.
The preparation method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
A) preparing raw materials;
B) respectively crushing the silicon-aluminum-calcium-carbon alloy, the wood charcoal and the sintered return ores, and screening and blanking by a screen with 5mm meshes to obtain natural-grade granules with the grain size of less than or equal to 5 mm; respectively carrying out ball milling on the sintered calcium aluminate, the manganese ore and the light-burned dolomite, and screening and blanking by using a 150-mesh sieve to obtain powder with the particle size smaller than 150 meshes; rolling sodium stearate, selecting a 100-mesh screen to sieve and discharge the materials to obtain powder with the particle size less than 100 meshes;
C) weighing the raw materials processed in the step B) according to the weight percentage, adding the raw materials into a vertical stirring machine, and stirring and mixing for 10 minutes to obtain a roller-milled mixture;
D) and C), adding the roller-milled mixture obtained in the step C) into a high-strength double-roller ball press, performing dry pressing to obtain a spheroid, wherein the diameter of the spheroid is 25mm, and packaging and warehousing the spheroid in a sealing packaging mode to obtain the converter large scrap steel ratio smelting composite slagging heat-compensating agent.
The use method of the composite slagging heat-replenishing agent for smelting the large scrap ratio of the converter comprises the following steps:
1) according to the chemical composition, the temperature, the molten iron amount and the scrap amount of the molten iron fed into the converter, a converter smelting static model is adopted to calculate the heat balance and the material balance of the converter, and the adding amount of the composite slagging heat-supplementing agent and the adding amount of the scrap for smelting the large scrap ratio of the converter under the smelting condition of the converter with the large scrap ratio of the converter are determined according to the calculation principle that the adding amount of the composite slagging heat-supplementing agent for smelting the large scrap ratio of the converter with 1Kg corresponds to the adding amount of the scrap with 4 Kg;
2) adding a bottom-padding slagging flux into a converter after deslagging, padding the bottom of the converter by the bottom-padding slagging flux, adding 5Kg/t of steel according to the adding amount of the waste steel obtained by calculating in the step 1), adding a composite slag-making heat-supplementing agent for smelting the large-ratio waste steel of the converter through a bunker, feeding molten iron, blowing by a gun, adding a second batch of slagging flux, blowing until the total oxygen consumption of the blowing process is 30% determined according to a static model for smelting the converter, adding a third batch of slagging flux, continuing blowing until temperature measurement sampling by a sublance, blowing according to a dynamic model of the sublance temperature measurement sampling result, stopping blowing the converter, tapping the converter, wherein the adding amount of the composite slag-making heat-supplementing agent for smelting the large-ratio waste steel of the converter calculated in the step 1) is the adding amount of the composite slag-making heat-supplementing agent for smelting the large-ratio waste steel of the converter, the total adding amount of the second batch of slagging flux and the bottom-up slagging flux accounts for 70 percent of the total weight of all slagging fluxes.
Example 2
A composite slagging heat-compensating agent for smelting of converter large scrap steel ratio is prepared from the following raw materials in percentage by weight: 60% of silicon-aluminum-calcium-carbon alloy, 12% of sintered calcium aluminate, 10% of wood charcoal, 5% of sintered return ores, 7% of manganese ores, 5.7% of light-burned dolomite and 0.3% of sodium stearate.
The silicon-aluminum-calcium-carbon alloy consists of Si, Al, Ca, C and Fe, and the impurity element is P, S, wherein the weight percentage content ranges of the Si, the Al, the Ca and the C are as follows: si, 45%, Al, 10%, Ca, 9%, C, 12%, and the content range of metal Fe by weight percent is: 24 percent, and the content range of the impurity element P, S by weight percent is as follows: p is less than or equal to 0.05 percent and S is less than or equal to 0.1 percent.
The sintered calcium aluminate contains 12CaO 7Al2O3，12CaO·7Al2O3The weight percentage of (B) is 83%.
The wood charcoal is a charcoal material obtained by distilling wood chips as a raw material, the sintering return ore is undersize sintered ore obtained by crushing and screening steel mill sintered ore, the manganese ore is a manganese hard ore, the light burned dolomite is a commercial product, and the sodium stearate is industrial-grade sodium stearate.
The preparation method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
A) preparing raw materials;
B) respectively crushing the silicon-aluminum-calcium-carbon alloy, the wood charcoal and the sintered return ores, and screening and blanking by a screen with 5mm meshes to obtain natural-grade granules with the grain size of less than or equal to 5 mm; respectively carrying out ball milling on the sintered calcium aluminate, the manganese ore and the light-burned dolomite, and screening and blanking by using a 150-mesh sieve to obtain powder with the particle size smaller than 150 meshes; rolling sodium stearate, selecting a 100-mesh screen to sieve and discharge the materials to obtain powder with the particle size less than 100 meshes;
C) weighing the raw materials processed in the step B) according to the weight percentage, adding the raw materials into a vertical stirring machine, and stirring and mixing for 15 minutes to obtain a roller-milled mixture;
D) and C), adding the roller-milled mixture obtained in the step C) into a high-strength double-roller ball press, performing dry pressing to obtain a spherical body, wherein the diameter of the spherical body is 50mm, and packaging and warehousing the spherical body in a sealing packaging manner to obtain the converter high scrap steel ratio smelting composite slagging heat-supply agent.
The use method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
1) according to the chemical composition, the temperature, the molten iron amount and the scrap amount of the molten iron fed into the converter, a converter smelting static model is adopted to calculate the heat balance and the material balance of the converter, and the adding amount of the composite slagging heat-supplementing agent and the adding amount of the scrap for smelting the large scrap ratio of the converter under the smelting condition of the converter with the large scrap ratio of the converter are determined according to the calculation principle that the adding amount of the composite slagging heat-supplementing agent for smelting the large scrap ratio of the converter with 1Kg corresponds to the adding amount of the scrap with 6 Kg;
2) adding a bottom-padding slagging flux into a converter after tapping and deslagging to pad the converter, wherein the adding amount of the bottom-padding slagging flux is 10Kg/t of steel, then adding scrap steel according to the adding amount of the scrap steel obtained by calculation in the step 1), then adding a converter large scrap ratio smelting composite slagging heat-supplementing agent through a bunker, feeding the converter into a gun to start blowing after molten iron is added, then adding a second batch of slagging flux, blowing until 35% of the total oxygen consumption of the blowing process determined according to a converter smelting static model, adding a third batch of slagging flux to continue blowing until temperature measurement sampling of the auxiliary gun is carried out, then blowing according to a smelting dynamic model according to the temperature measurement sampling result of the auxiliary gun until the converter stops blowing, and then tapping the converter, wherein the adding amount of the converter large scrap ratio smelting composite slagging heat-supplementing agent is the adding amount of the converter large scrap ratio smelting composite slagging heat-supplementing agent obtained by calculation in the step 1), the sum of the addition amount of the second batch of slagging flux and the bottom-up slagging flux accounts for 80 percent of the weight of all slagging fluxes.
Example 3
A composite slagging heat-compensating agent for smelting of converter large scrap steel ratio is prepared from the following raw materials in percentage by weight: 58 percent of silicon-aluminum-calcium-carbon alloy, 15 percent of sintered calcium aluminate, 5 percent of wood carbon, 6.6 percent of sintered return ores, 10 percent of manganese ores, 5 percent of light-burned dolomite and 0.4 percent of sodium stearate.
The silicon-aluminum-calcium-carbon alloy consists of Si, Al, Ca, C and Fe, and the impurity element is P, S, wherein the weight percentage content ranges of the Si, the Al, the Ca and the C are as follows: si, 43%, Al, 10%, Ca, 19%, C, 12%, and the content range of metal Fe by weight percent is: 15 percent, and the content ranges of the impurity element P, S by weight percent are as follows: p is less than or equal to 0.05 percent and S is less than or equal to 0.1 percent.
The sintered calcium aluminate contains 12CaO 7Al2O3，12CaO·7Al2O3Is 82 percent by weight.
The wood charcoal is a charcoal material obtained by distilling wood blocks as raw materials, the sintering return ore is undersize sintered ore obtained by crushing and screening steel mill sintered ore, manganese ore is scleromanganese ore, light-burned dolomite is a commercially available product, and sodium stearate is industrial-grade sodium stearate.
The preparation method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
A) preparing raw materials;
B) respectively crushing the silicon-aluminum-calcium-carbon alloy, the wood charcoal and the sintered return ores, and screening and blanking by a screen with 5mm meshes to obtain natural-grade granules with the grain size of less than or equal to 5 mm; respectively carrying out ball milling on the sintered calcium aluminate, the manganese ore and the light-burned dolomite, and screening and blanking by using a 150-mesh sieve to obtain powder with the particle size smaller than 150 meshes; rolling sodium stearate, selecting a 100-mesh screen to sieve and discharge the materials to obtain powder with the particle size less than 100 meshes;
C) weighing the raw materials processed in the step B) according to the weight percentage, adding the raw materials into a vertical stirring machine, and stirring and mixing for 13 minutes to obtain a roller-milled mixture;
D) and C), adding the roller-milled mixture obtained in the step C) into a high-strength double-roller ball press, performing dry pressing to obtain a spheroid, wherein the diameter of the spheroid is 35mm, and packaging and warehousing the spheroid in a sealing packaging mode to obtain the converter large scrap steel ratio smelting composite slagging heat-compensating agent.
The use method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
1) according to the chemical composition, the temperature, the molten iron amount and the scrap amount of the molten iron fed into the converter, a converter smelting static model is adopted to calculate the heat balance and the material balance of the converter, and the adding amount of the composite slagging heat-supplementing agent and the adding amount of the scrap for smelting the large scrap ratio of the converter under the smelting condition of the converter with the large scrap ratio of the converter are determined according to the calculation principle that the adding amount of the composite slagging heat-supplementing agent for smelting the large scrap ratio of the converter with 1Kg corresponds to the adding amount of the scrap with 5 Kg;
2) adding a bottom-up slagging flux into a converter after deslagging during tapping to carry out converter bottom-up, wherein the adding amount of the bottom-up slagging flux is 8Kg/t steel, then adding scrap steel according to the adding amount of the scrap steel obtained by calculation in the step 1), then adding a converter large-scrap-ratio smelting composite slagging heat-supplementing agent through a bunker, feeding the converter into a gun to start blowing after molten iron is added, then adding a second batch of slagging flux, blowing until the total oxygen consumption of the blowing process is 33% determined according to a converter smelting static model, adding a third batch of slagging flux to continue blowing until the temperature of an auxiliary gun is measured and sampled, and then blowing according to a smelting dynamic model according to the result of temperature measurement sampling of the auxiliary gun until the converter stops blowing, and then tapping the converter, wherein the adding amount of the converter large-scrap-ratio smelting composite slagging heat-supplementing agent is the adding amount of the converter large-scrap-ratio smelting composite slagging heat-supplementing agent calculated in the step 1), the total adding amount of the second batch of slagging flux and the bottom-up slagging flux accounts for 75 percent of the total weight of the slagging fluxes.
Example 4
A composite slagging heat-compensating agent for smelting of converter large scrap steel ratio is prepared from the following raw materials in percentage by weight: 56% of silicon-aluminum-calcium-carbon alloy, 10.6% of sintered calcium aluminate, 6% of wood charcoal, 10% of sintered return ores, 11% of manganese ores, 6% of light-burned dolomite and 0.4% of sodium stearate.
The silicon-aluminum-calcium-carbon alloy consists of Si, Al, Ca, C and Fe, and the impurity element is P, S, wherein the weight percentage content ranges of the Si, the Al, the Ca and the C are as follows: si, 43%, Al, 5%, Ca, 17%, C, 11%, and the content range of metal Fe by weight percent is: 23 percent, and the content range of the impurity element P, S by weight percent is as follows: p is less than or equal to 0.05 percent and S is less than or equal to 0.1 percent.
The sintered calcium aluminate contains 12CaO 7Al2O3，12CaO·7Al2O3Is 85% by weight.
The wood charcoal is a charcoal material obtained by distilling coconut shells serving as a raw material, the sintering return ore is undersize sinter obtained by crushing and screening steel mill sinter, manganese ore is pyrolusite, light calcined dolomite is a commercial product, and sodium stearate is industrial-grade sodium stearate.
The preparation method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
A) preparing raw materials;
B) respectively crushing the silicon-aluminum-calcium-carbon alloy, the wood charcoal and the sintered return ores, and screening and blanking by a screen with 5mm meshes to obtain natural-grade granules with the grain size of less than or equal to 5 mm; respectively carrying out ball milling on the sintered calcium aluminate, the manganese ore and the light-burned dolomite, and screening and blanking by using a 150-mesh sieve to obtain powder with the particle size smaller than 150 meshes; rolling sodium stearate, selecting a 100-mesh screen to sieve and discharge the materials to obtain powder with the particle size less than 100 meshes;
C) weighing the raw materials processed in the step B) according to the weight percentage, adding the raw materials into a vertical stirring machine, and stirring and mixing for 12 minutes to obtain a roller-milled mixture;
D) and C), adding the roller-milled mixture obtained in the step C) into a high-strength double-roller ball press, performing dry pressing to obtain a spherical body, wherein the diameter of the spherical body is 40mm, and packaging and warehousing the spherical body in a sealing packaging manner to obtain the converter large scrap steel ratio smelting composite slagging heat-supply agent.
The use method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
1) according to the chemical composition, the temperature, the molten iron amount and the scrap steel amount of the molten iron fed into the converter, a converter smelting static model is adopted to calculate the heat balance and the material balance of the converter, and the adding amount of the composite slagging heat-supplementing agent and the adding amount of the scrap steel for smelting the large scrap steel ratio of the converter under the smelting condition of the converter are determined according to the calculation principle that the adding amount of the composite slagging heat-supplementing agent for smelting the large scrap steel ratio of the converter is 1Kg and the adding amount of the scrap steel is 4.5 Kg;
2) adding a bottom-padding slagging flux into a converter after deslagging, padding the bottom of the converter by using the bottom-padding slagging flux, wherein the adding amount of the bottom-padding slagging flux is 8Kg/t of steel, then adding scrap steel according to the adding amount of the scrap steel obtained by calculating in the step 1), then adding a composite slag-making heat-supplementing agent for smelting the large-ratio scrap steel of the converter through a bunker, feeding the converter into a lance to start blowing after molten iron is added, then adding a second batch of slagging flux, blowing until the oxygen consumption of the blowing process is 32% determined according to a static model for smelting the converter, adding a third batch of slagging flux to continue blowing until the temperature of the lance is measured and sampled, and then blowing according to a dynamic model for smelting until the converter stops blowing according to the result of temperature measurement and sampling of the lance, and then tapping of the converter, wherein the adding amount of the composite slag-making heat-supplementing agent for smelting the large-ratio steel of the converter calculated in the step 1) is the adding amount of the composite slag-making heat-supplementing agent for smelting the large-making slag-making heat-supplementing agent for smelting the large-ratio of the converter, the total adding amount of the second batch of slagging flux and the bottom-up slagging flux accounts for 76 percent of the weight of all slagging fluxes.
Example 5
A composite slagging heat-compensating agent for smelting of converter large scrap steel ratio is prepared from the following raw materials in percentage by weight: 55% of silicon-aluminum-calcium-carbon alloy, 11% of sintered calcium aluminate, 5% of wood carbon, 7% of sintered return ores, 11.5% of manganese ores, 10% of light-burned dolomite and 0.5% of sodium stearate.
The silicon-aluminum-calcium-carbon alloy consists of Si, Al, Ca, C and Fe, and the impurity element is P, S, wherein the weight percentage content ranges of the Si, the Al, the Ca and the C are as follows: si, 44%, Al, 10%, Ca, 17%, C, 4%, and the content range of metal Fe by weight percent is: 24 percent, and the content range of the impurity element P, S by weight percent is as follows: p is less than or equal to 0.05 percent and S is less than or equal to 0.1 percent.
The sintered calcium aluminate contains 12CaO 7Al2O3，12CaO·7Al2O3Is 82 percent by weight.
The wood charcoal is a charcoal material obtained by distilling shells serving as raw materials, the sintering return ore is undersize sintered ore obtained by crushing and screening steel mill sintered ore, manganese ore is pyrolusite, light burned dolomite is a commercially available product, and sodium stearate is industrial-grade sodium stearate.
The preparation method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
A) preparing raw materials;
B) respectively crushing the silicon-aluminum-calcium-carbon alloy, the wood charcoal and the sintered return ores, and screening and blanking by a screen with 5mm meshes to obtain natural-grade granules with the grain size of less than or equal to 5 mm; respectively carrying out ball milling on the sintered calcium aluminate, the manganese ore and the light-burned dolomite, and screening and blanking by using a 150-mesh sieve to obtain powder with the particle size smaller than 150 meshes; rolling sodium stearate, selecting a 100-mesh screen to sieve and discharge the materials to obtain powder with the particle size less than 100 meshes;
C) weighing the raw materials processed in the step B) according to the weight percentage, adding the raw materials into a vertical stirring machine, and stirring and mixing for 15 minutes to obtain a roller-milled mixture;
D) and D) adding the roller-milled mixture obtained in the step C) into a high-strength double-roller ball press, performing dry pressing to obtain a spherical body, wherein the diameter of the spherical body is 45mm, and packaging and warehousing the spherical body in a sealing packaging manner to obtain the large scrap steel ratio smelting composite slagging heat-supplementing agent for the converter.
The use method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
1) according to the chemical composition, the temperature, the molten iron amount and the scrap amount of the molten iron fed into the converter, a converter smelting static model is adopted to calculate the heat balance and the material balance of the converter, and the adding amount of the composite slagging heat-supplementing agent and the adding amount of the scrap for smelting the large scrap ratio of the converter under the smelting condition of the converter with the large scrap ratio of the converter are determined according to the calculation principle that the adding amount of the composite slagging heat-supplementing agent for smelting the large scrap ratio of the converter with 1Kg corresponds to the adding amount of the scrap with 6 Kg;
2) adding a bottom-padding slagging flux into a converter after deslagging, padding the bottom of the converter by using the bottom-padding slagging flux, wherein the adding amount of the bottom-padding slagging flux is 8Kg/t of steel, then adding scrap steel according to the adding amount of the scrap steel obtained by calculating in the step 1), then adding a converter large scrap steel ratio smelting composite slagging heat-supplementing agent through a bunker, feeding the converter into a gun to start blowing after molten iron is added, then adding a second batch of slagging flux, blowing until 35% of total oxygen consumption of a blowing process determined according to a converter smelting static model, adding a third batch of slagging flux to continue blowing until temperature measurement sampling of the auxiliary gun is carried out, then blowing according to a smelting dynamic model according to the result of the auxiliary gun temperature measurement sampling until the converter stops blowing, and then tapping the converter, wherein the adding amount of the converter large scrap steel ratio smelting composite slagging heat-supplementing agent is the adding amount of the converter large scrap steel ratio smelting composite slagging heat-supplementing agent obtained by calculating in the step 1), the total adding amount of the second batch of slagging flux and the bottom-up slagging flux accounts for 75 percent of the total weight of the slagging fluxes.
Example 6
A composite slagging heat-compensating agent for smelting of converter large scrap steel ratio is prepared from the following raw materials in percentage by weight: 56% of silicon-aluminum-calcium-carbon alloy, 11% of sintered calcium aluminate, 5% of wood carbon, 6% of sintered return ores, 15% of manganese ores, 6.7% of light-burned dolomite and 0.3% of sodium stearate.
The silicon-aluminum-calcium-carbon alloy consists of Si, Al, Ca, C and Fe, and the impurity element is P, S, wherein the weight percentage content ranges of the Si, the Al, the Ca and the C are as follows: si, 42%, Al, 11%, Ca, 18%, C, 8%, and the content range of metal Fe by weight percent is: 20 percent, and the content range of the impurity element P, S by weight percent is as follows: p is less than or equal to 0.05 percent and S is less than or equal to 0.1 percent.
The sintered calcium aluminate contains 12CaO 7Al2O3，12CaO·7Al2O3Is 83 percent by weight.
The wood charcoal is a charcoal material obtained by distilling cotton stalks as raw materials, the sintering return ore is undersize sintered ore obtained by crushing and screening steel mill sintered ore, manganese ore is pyrolusite, light-burned dolomite is a commercially available product, and sodium stearate is industrial-grade sodium stearate.
The preparation method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
A) preparing raw materials;
B) respectively crushing the silicon-aluminum-calcium-carbon alloy, the wood charcoal and the sintered return ores, and screening and blanking by a screen with 5mm meshes to obtain natural-grade granules with the grain size of less than or equal to 5 mm; respectively performing ball milling on the sintered calcium aluminate, the manganese ore and the light-burned dolomite, screening by using a 150-mesh screen, and discharging to obtain powder with the particle size of less than 150 meshes; rolling sodium stearate, selecting a 100-mesh screen to sieve and discharge the materials to obtain powder with the particle size less than 100 meshes;
C) weighing the raw materials processed in the step B) according to the weight percentage, adding the raw materials into a vertical stirring machine, and stirring and mixing for 12 minutes to obtain a roller-milled mixture;
D) and C), adding the roller-milled mixture obtained in the step C) into a high-strength double-roller ball press, performing dry pressing to obtain a spheroid, wherein the diameter of the spheroid is 30mm, and packaging and warehousing the spheroid in a sealing packaging mode to obtain the converter large scrap steel ratio smelting composite slagging heat-compensating agent.
The use method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
1) according to the chemical composition, the temperature, the amount of molten iron and the amount of scrap steel of the molten iron fed into the converter by the converter, a converter smelting static model is adopted to calculate the heat balance and the material balance of the converter, and according to the calculation principle that the addition of 1Kg of converter large scrap steel ratio smelting composite slagging heat-supplementing agent corresponds to the addition of 5Kg of scrap steel, the addition of the converter large scrap steel ratio smelting composite slagging heat-supplementing agent and the addition of the scrap steel under the current large scrap steel ratio converter smelting condition are determined;
2) adding a bottom-padding slagging flux into a converter after deslagging, padding the bottom of the converter by the bottom-padding slagging flux, adding waste steel according to the addition of the waste steel obtained by calculating in the step 1), adding a converter large waste steel ratio smelting composite slagging heat-supplementing agent through a bunker, feeding molten iron, blowing by a gun, adding a second batch of slagging flux, blowing until the total oxygen consumption of the blowing process is 32% determined according to a converter smelting static model, adding a third batch of slagging flux, continuing blowing until the temperature of a sublance is measured and sampled, blowing according to a smelting dynamic model according to the result of the sublance temperature measurement sampling until the converter stops blowing, and then tapping the converter, wherein the addition of the converter large waste steel ratio smelting composite slagging heat-supplementing agent is the addition of the converter large waste steel ratio smelting composite slagging heat-supplementing agent calculated in the step 1), the total adding amount of the second batch of slagging flux and the bottom-up slagging flux accounts for 72 percent of the total slagging flux.
Example 7
A composite slagging heat-compensating agent for smelting of converter large scrap steel ratio is prepared from the following raw materials in percentage by weight: 56.7 percent of silicon-aluminum-calcium-carbon alloy, 12 percent of sintered calcium aluminate, 7 percent of wood charcoal, 7 percent of sintered return ores, 11 percent of manganese ores, 6 percent of light-burned dolomite and 0.3 percent of sodium stearate.
The silicon-aluminum-calcium-carbon alloy consists of Si, Al, Ca, C and Fe, and the impurity element is P, S, wherein the weight percentage content ranges of the Si, the Al, the Ca and the C are as follows: si, 43%, Al, 9%, Ca, 16%, C, 11%, and the content range of metal Fe by weight percent is: 21 percent, and the content ranges of the impurity element P, S by weight percent are as follows: p is less than or equal to 0.05 percent and S is less than or equal to 0.1 percent.
The sintered calcium aluminate contains 12CaO 7Al2O3，12CaO·7Al2O3Is 85% by weight.
The wood charcoal is made of rice husk as raw material and through distillation to obtain charcoal material, the sintering return ore is undersize sintered ore obtained by crushing and sieving steel mill sintered ore, manganese ore is scleromanganese ore, light-burned dolomite is a commercially available product, and sodium stearate is industrial grade sodium stearate.
The preparation method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
A) preparing raw materials;
B) respectively crushing the silicon-aluminum-calcium-carbon alloy, the wood charcoal and the sintered return ores, and screening and blanking by a screen with 5mm meshes to obtain natural-grade granules with the grain size of less than or equal to 5 mm; respectively carrying out ball milling on the sintered calcium aluminate, the manganese ore and the light-burned dolomite, and screening and blanking by using a 150-mesh sieve to obtain powder with the particle size smaller than 150 meshes; rolling sodium stearate, selecting a 100-mesh screen to sieve and discharge the materials to obtain powder with the particle size less than 100 meshes;
C) weighing the raw materials processed in the step B) according to the weight percentage, adding the raw materials into a vertical stirring machine, and stirring and mixing for 10 minutes to obtain a roller-milled mixture;
D) and D) adding the roller-milled mixture obtained in the step C) into a high-strength double-roller ball press, performing dry pressing to obtain a spheroid, wherein the diameter of the spheroid is 30mm, and packaging and warehousing the spheroid by adopting a sealing packaging mode to obtain the large scrap steel ratio smelting composite slagging heat-supplementing agent for the converter.
The use method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter comprises the following steps:
1) according to the chemical composition, the temperature, the molten iron amount and the scrap amount of the molten iron fed into the converter, a converter smelting static model is adopted to calculate the heat balance and the material balance of the converter, and the adding amount of the composite slagging heat-supplementing agent and the adding amount of the scrap for smelting the large scrap ratio of the converter under the smelting condition of the converter with the large scrap ratio of the converter are determined according to the calculation principle that the adding amount of the composite slagging heat-supplementing agent for smelting the large scrap ratio of the converter with 1Kg corresponds to the adding amount of the scrap with 5 Kg;
2) adding a bottom-up slagging flux into a converter after tapping and deslagging to carry out converter bottom-up, wherein the adding amount of the bottom-up slagging flux is 10Kg/t steel, then adding scrap steel according to the adding amount of the scrap steel obtained by calculation in the step 1), then adding a converter large-scrap-ratio smelting composite slagging heat-supplementing agent through a silo, feeding molten iron, then blowing by a gun, then adding a second batch of slagging flux, blowing until the total oxygen consumption of the blowing process is 35% determined according to a converter smelting static model, adding a third batch of slagging flux to continue blowing until temperature measurement and sampling of an auxiliary gun are carried out, then blowing according to a smelting dynamic model according to the temperature measurement and sampling result of the auxiliary gun until the converter stops blowing, and then tapping is carried out by the converter, wherein the adding amount of the converter large-scrap-ratio smelting composite slagging heat-supplementing agent calculated in the step 1) is the adding amount of the converter large-scrap-ratio smelting composite slagging heat-supplementing agent, the total adding amount of the second batch of slagging flux and the bottom-up slagging flux accounts for 75 percent of the total weight of the slagging fluxes.
According to statistics, in the above examples, compared with the prior art, the average scrap steel consumption per kg of the heat-compensating agent is increased and the converter smelting period is shortened as shown in the following table:
Figure BDA0003565372640000191
in the embodiment, the average scrap steel consumption of each kilogram of the heat-supplementing agent is increased by 5Kg, and the converter smelting period is shortened by more than 1.5min compared with that of converter-entering molten iron under the condition of 0.8-0.85.
The composite slagging heat-compensating agent for smelting the large steel scrap ratio of the converter and the preparation and use methods thereof have the characteristics of high oxidation combustion heat value, low harmful element content, low cost, convenient preparation, promotion of converter slagging and slagging, improvement of converter dephosphorization efficiency and the like; the slag-removing agent is applied as a converter smelting heat-supplementing agent, has the advantages of stable converter oxygen-blowing combustion, high heat-supplementing efficiency, low heat-supplementing cost, high converter slagging speed, high dephosphorization efficiency and no increase of the contents of harmful elements and residual elements in molten steel, and achieves the aim of high-quality, high-efficiency, low-cost, low-carbon and green smelting of large waste steel of a converter; the preparation and use methods of the composite slagging heat-compensating agent for smelting the large steel scrap ratio of the converter ensure the preparation quality and the application effect of the composite slagging heat-compensating agent for smelting the large steel scrap ratio of the converter, realize the synchronous implementation of the high-efficiency heat compensation and the rapid slagging of the converter through industrial tests, achieve the comprehensive aims of reducing the consumption of the heat-compensating agent and a flux of the converter, improving the steel scrap ratio and the metal yield of the converter, shortening the smelting period, stabilizing the tapping quality and the like, and meet the production requirements of the high-quality, high-efficiency, low-cost, low-carbon and green smelting of the large steel scrap ratio of the converter.

Claims (8)

1. The composite slagging heat-compensating agent for smelting the large scrap ratio of the converter is characterized by comprising the following components in parts by weight: the material is prepared from the following raw materials in percentage by weight: 55-60% of silicon-aluminum-calcium-carbon alloy, 10-15% of sintered calcium aluminate, 5-10% of wood charcoal, 5-10% of sintered return ores, 10-15% of manganese ores, 5-10% of light-burned dolomite and 0.3-0.5% of sodium stearate.
2. The composite slagging heat-supplying agent for smelting large scrap ratio of converter according to claim 1, which is characterized in that: the silicon-aluminum-calcium-carbon alloy consists of Si, Al, Ca, C and Fe, and the impurity element is P, S, wherein the weight percentage content ranges of the Si, the Al, the Ca and the C are as follows: 35-45% of Si, 5-12% of Al, 9-19% of Ca, 4-12% of C, and the weight percentage content range of metal Fe is as follows: 15-25%, wherein the content of the impurity element P, S in percentage by weight is as follows: p is less than or equal to 0.05 percent and S is less than or equal to 0.1 percent.
3. The composite slagging heat-supplying agent for smelting large scrap ratio of converter according to claim 1, which is characterized in that: the sintered calcium aluminate contains 12CaO 7Al2O3，12CaO·7Al2O3The weight percentage of the component (a) is more than or equal to 85 percent.
4. The composite slagging heat-supplying agent for smelting large scrap ratio of converter according to claim 1, which is characterized in that: the wood charcoal is a carbonaceous material obtained by distilling raw materials of wattle wood, sawdust, wood block, coconut shell, fruit shell, cotton stalk or rice hull.
5. The composite slagging heat-supplying agent for smelting large scrap ratio of converter according to claim 1, which is characterized in that: the sintering return ores are undersize sintered ores obtained after crushing and screening of steel mill sintered ores.
6. The composite slagging heat-supplying agent for smelting large scrap ratio of converter according to claim 1, which is characterized in that: the manganese ore is pyrolusite or pyrolusite.
7. The preparation method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter according to claim 1 is characterized by comprising the following steps: the method comprises the following steps:
A) preparing raw materials;
B) respectively crushing the silicon-aluminum-calcium-carbon alloy, the wood charcoal and the sintered return ores, and screening and blanking by selecting a screen with 5mm meshes to obtain natural-graded granules with the particle size of less than or equal to 5 mm; respectively carrying out ball milling on the sintered calcium aluminate, the manganese ore and the light-burned dolomite, and selecting a 150-mesh screen to sieve the materials to obtain powder with the particle size of less than 150 meshes; rolling sodium stearate, selecting a 100-mesh screen to sieve and discharge the materials to obtain powder with the particle size less than 100 meshes;
C) weighing the raw materials treated in the step B) according to the weight percentage, adding the raw materials into a vertical stirrer, and stirring and mixing for 10-15 minutes to obtain a roller-milled mixture;
D) and C), adding the roller-milled mixture obtained in the step C) into a high-strength double-roller ball press, performing dry pressing to obtain a spheroid, wherein the diameter of the spheroid is 25-50 mm, and packaging and warehousing the spheroid in a sealing packaging mode to obtain the converter large scrap steel ratio smelting composite slagging heat-compensating agent.
8. The use method of the composite slagging heat-compensating agent for smelting the large scrap ratio of the converter according to claim 1 is characterized by comprising the following steps: the method comprises the following steps:
1) according to the chemical composition, the temperature, the molten iron amount and the scrap steel amount of the molten iron fed into the converter, a converter smelting static model is adopted to calculate the heat balance and the material balance of the converter, and according to the calculation principle that the addition of the composite slagging heat-supplementing agent for smelting the large scrap steel of the 1Kg converter corresponds to the addition of 4-6 Kg scrap steel, the addition of the composite slagging heat-supplementing agent for smelting the large scrap steel of the converter and the addition of the scrap steel under the smelting condition of the converter with the large scrap steel ratio are determined;
2) adding a bottom-up slagging flux into a converter after deslagging, padding the bottom of the converter by the bottom-up slagging flux, wherein the adding amount of the bottom-up slagging flux is 5-10 Kg/t of steel, then adding scrap steel according to the adding amount of the scrap steel obtained by calculation in the step 1), then adding a composite slag-making heat-supplementing agent for smelting the large-ratio scrap steel of the converter through a bunker, feeding the converter into a lance to start blowing after molten iron is added, then adding a second batch of slagging flux, blowing until the total oxygen consumption of the blowing process is 30-35% determined according to a static model for smelting the converter, adding a third batch of slagging flux to continue blowing until the temperature of the lance is measured and sampled, blowing according to a dynamic model for smelting according to the temperature measurement sampling result of the lance until the converter stops blowing, and then tapping the converter, wherein the adding amount of the composite slag-making heat-supplementing agent for smelting the large-ratio of the converter calculated in the step 1) is the adding amount of the composite slag-making heat-supplementing agent for smelting the large-making steel of the converter, the sum of the addition amount of the second batch of slagging flux and the bottom-up slagging flux accounts for 70-80% of the total slagging flux by weight.
CN202210306139.3A 2022-03-25 2022-03-25 Composite slag-making and heat-supplementing agent for converter large scrap ratio smelting and preparation and use methods thereof Active CN114686643B (en)

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CN106591538A (en) * 2016-12-02 2017-04-26 青岛特殊钢铁有限公司 Environmental-protecting and energy-saving premelting refining slag conditioning agent
CN111635979A (en) * 2020-06-03 2020-09-08 马鞍山市兴达冶金新材料有限公司 Low-cost heat generating agent for converter and production method thereof
CN113005260A (en) * 2021-04-19 2021-06-22 武汉钢铁有限公司 Converter composite heat generating agent and preparation method thereof

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CN1523121A (en) * 2003-09-04 2004-08-25 吴光亮 Carbon-iron heat generating agent for steel-making and producing process and method of using thereof
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