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Smelting method for melting steel slag into mineral wool material in converter steelmaking process
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A converter steel and mineral technology, applied in the direction of manufacturing tools, manufacturing converters, glass manufacturing equipment, etc., can solve the problems of large reducing dose, unimplementation, and splashing, etc., to reduce FeO content and metal iron content, Huge economic and social benefits, the effect of improving slag fluidity
Inactive Publication Date: 2018-07-10
王虎
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Problems solved by technology
To modify the initial converter slag with an alkalinity [CaO / SiO2) of 1.0-2.0 into mineral wool with an acidity (SiO2+Al2O) / (CaO+MgO) of 1.1-1.7 requires the addition of a large amount of modifiers and reducing agents. In addition to the heat generated by the reducing agent, there is no other heat source. The viscosity of the slag is already high, and the volume of the slag tank is small. Adding a large amount of modifier and reducing agent can not stir evenly, and it is difficult to reach the mineral wool Modification effect required
Using mechanical stirring, its service life and stirring effect are unsuitable for use. Using gas stirring will cause splashing and large temperature drop, and it cannot be implemented; since there is no other heat source, it is modified to the modifier and added when the acidity is greater than 1.5. The amount of reducing agent is large, the amount of reducing agent added is small, and the heat is not enough. If the amount of reducing agent added is too large, the FeO content in the slag cannot be guaranteed, so the viscosity of the slag material cannot be controlled, so it is impossible to use this patented technology to produce rock wool.
At the same time, a converter with this patented technology requires frequent lifting of 2-5 slag tanks, and the operating rate of the vehicle is not allowed; the reduced iron is difficult to completely precipitate and recover due to the thick slag layer
Method used
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Embodiment 1
[0012] 110 tons of converter, 95 tons of molten iron, 12 tons of steel scrap, double slag retention process, blowing 5′30″ dephosphorization slag composition TFe14.5%, FeO 13.1%, CaO 41.7%, SiO2 27.8%, MgO 6.2%, P2O5 3.2%, Al2O3 2.1%, MnO 2.83% R 1.5; add 750 kg of bauxite, press the gun for about 30″ and then add 700 kg of yellow sand, at the same time, continue to press the gun for 20″ Then stop blowing out the slag to obtain tempered slag with an acidity of 1.2, FeO 4.8%, and a temperature of 1356°C. After heat preservation, the slag is directly sent to the blowing machine until the viscosity is suitable, and then the mineral wool can be blown.
Embodiment 2
[0014] 110 tons of converter, 93 tons of molten iron, 13 tons of steel scrap, double slag retention process, blowing 5′20″ dephosphorization slag composition TFe16.5%, FeO 15.1%, CaO 35.79%, SiO2 29.8%, MgO 5.27%, P2O5 3.3%, Al2O3 1.82%, MnO 2.81%, R 1.2; add 750 kg of Al2O3 series refining slag, and then add 700 kg of yellow sand after the pressure gun blowing is about 30″, and at the same time, continue the pressure gun operation 30″, the slag is released after the blowing is stopped, the acidity is 1.2, the FeO is 4.5%, the temperature is 1341°C, and the mineral wool can be blown after the viscosity is suitable and the temperature is 1341°C.
Embodiment 3
[0016] 110 tons of converter, 97 tons of molten iron, 11 tons of steel scrap, slag retention process, blowing 3′20″ desiliconization slag composition TFe21.5%, FeO 19.52%, CaO 25.6%, SiO2 31.8%, MgO 4.5% , P2O5 2.01%, Al2O3 3.22%, MnO 4.03%, R 0.81363°C; add 450 kg of bauxite, at the same time, operate the pressure gun at 1′10″, stop the blowing gun and add 300 kg of SiC to remove the slag , to obtain acidity 1.3, FeO 3.2%, temperature 1370 ° C, heat preservation and stand still, directly sent to blowing machine to blow mineral wool after the viscosity is suitable.
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Abstract
The invention discloses a smelting method for melting steel slag into a mineral wool material in a converter steelmaking process. The smelting method can process steel slag in the initial stage of steelmaking into a mineral wool material with acidity and temperature satisfying the requirements through a conditioner or a reducing agent. The smelting method fully utilizes the existing converter equipment of the steel factory, fully utilizes steel slag and the thermal energy of the steel slag to produce a high value-added mineral wool material, solves the problems of steel slag thermal energy useand converter steel slag use and provides an efficient path for high value-added use of steel slag. Through use of the conditioner, the steel slag fluidity is greatly improved. After the initial stage of steelmaking, the poured phosphorus-containing steel slag is greatly increased and the burden of subsequent dephosphorization is reduced. In the later stage of tempering blowing, a gun caulking process is carried out so that the FeO content and metaliron content of the slag are greatly reduced, the steel consumption is reduced and the mineral wool quality is improved. The conditioner comprises a variety of waste slag so that waste slag use is realized and a use value of the waste slag is improved. The smelting method greatly reduces the yield of the mineral wool, reduces the coal consumption and waste gaspollution caused by the coal consumption and has enormous economic and social benefits.
Description
technical field [0001] The process relates to the field of converter steelmaking, in particular to smelting steel slag into mineral wool material while converter steel is being made. Background technique [0002] Smeltingblast furnace dry slag or hot molten blast furnace slag to make slag wool is a mature process. In recent years, there has been a patent application technology for producing slag wool by using converter molten steel slag "a method for producing mineral wool by using molten steel slag in the early stage of converter" (Application No.: 201610369708.3) came out. This patent application technology uses low-alkalinitymolten steel slag in the early stage of the converter to enter the slag tank, and then adds a modifier and a heating agent, that is, a silicon-iron-aluminum reducing agent to reduce heat and reduce the iron oxide in the slag. To counteract the temperature drop caused by the addition of SiO2-based materials or Al2O3-based modifiers, through stirring,...
Claims
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Application Information
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