Powder spraying device and method for efficient vanadium extracting process of converter
A powder spraying and converter technology, applied in the field of metallurgy, can solve the problems of poor reaction kinetics in the molten pool, easy to produce extremely cold and extremely hot in the molten pool, and unable to control the temperature continuously, so as to shorten the smelting cycle and improve the kinetics and thermodynamics. Conditions, the effect of significant economic benefits
Active Publication Date: 2011-12-21
HEBEI IRON AND STEEL +1
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However, due to the low temperature of the converter vanadium extraction process, the carbon-oxygen reaction is inhibited, and the content of vanadium in the molten iron is only 0.3% to 0.4%. The blowing time also reduces the recovery rate of vanadium, and the reaction kinetics of the molten pool is poor, resulting in high TFe content in the semi-steel remaining vanadium and slag; at the same time, the vanadium extraction process has very strict requirements on the temperature of the molten pool. Vanadium pig iron blocks, iron ore, and iron oxide balls are used to control the temperature of massive coolants, but the massive coolants cannot continuously control the temperature of the converter vanadium extraction process, which makes the molten pool prone to extreme cold and extreme heat, which is not conducive to vanadium extraction The smooth progress of the reaction
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[0018] For a 150-ton vanadium extraction converter, the inner diameter D1 of the powder spray gun is selected to be 25mm, and the ring slit width D2 is 1.5mm. The powder spray gun is installed 300mm below the liquid surface, the angle α to the liquid surface is 15°, and the installation angle β of the tangent plane to the furnace wall installation point is 60°. The powder spraying smelting process adopts N 2 As carrier gas and protective gas.
[0019] Powder spraying operation control process: ①Open the pressure valve 7 and increase the tank pressure to 0.50~0.55MPa; ②Adjust the carrier gas flow; ③Open the discharge valve 13; ④Open the fluidization valve 10 to adjust the fluidization pressure to 0.50MPa.
[0020] Feeding period: when loading scrap steel into molten iron, blowing nitrogen to protect powder spray gun, auxiliary blowing flow 200~300Nm 3 / h, the carrier gas flow is 100Nm 3 / h, the air flow rate of the annular joint is 150~200Nm 3 / h.
[0021] Early stage of smelting: blo...
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The invention discloses a powder spraying device and a powder spraying method for an efficient vanadium extracting process of a converter, belongs to the technical field of metallurgy, and aims to solve the technical problems of poor dynamical condition, low oxidation conversion rate of vanadium and the like in the vanadium extracting process of the converter. The device comprises a powder spraying tank system, a PLC (programmable logic controller) control system, a gas adjusting valve set and a powder spraying gun. The powder spraying rate is accurately and continuously controlled by adjusting the frequency of a rotary feeding tray motor, the powder spraying gun has a double-sleeve structure, carrier gas powder spraying is adopted in a central pipe, meanwhile, auxiliary blowing gas ensures continuous operation of the powder spraying process, and circular seam blowing protective gas protects the powder spraying gun. The powder spraying gun is arranged on the side or the bottom of the vanadium extracting converter, and protective sleeve bricks are embedded around the powder spraying gun. The device is suitable for the vanadium extracting converter of 10 to 200 tons, can spray 50 to200kg / min iron concentrate powder in the vanadium extracting process of the converter, improve the dynamical and thermodynamic conditions of vanadium extraction of the converter, reduce the content of half steel vanadium to be less than 0.03 percent and improve the content of vanadium slag (V2O5) by 2 to 5 percent, meanwhile, is favorable for shortening the vanadium extracting smelting period of the converter, and realizes efficient vanadium extraction of the converter.
Description
Technical field [0001] The invention relates to a powder spraying metallurgical device and method, in particular to a powder spraying vanadium extraction device and method that uses a set of powder spraying system to spray vanadium iron fine powder as a coolant into a vanadium extraction converter for efficient vanadium extraction. Metallurgical technology field. Background technique [0002] At present, the vanadium extraction process at home and abroad is mainly based on the converter vanadium extraction. The converter vanadium extraction must achieve the ideal vanadium oxidation conversion rate, obtain the highest possible semi-steel residual carbon and superheat, and at the same time effectively control the quality of vanadium slag. The key to the shortest vanadium conversion cycle and other goals is to grasp the temperature control of the converter bath in the vanadium extraction process and provide good bath stirring capabilities to create good kinetic and thermodynamic con...
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IPC IPC(8): C21C5/36C21C5/46F27D3/18C22B34/22
Inventor 朱荣白瑞国吕明张兴利梁新维王磊王宝华林腾昌
Owner HEBEI IRON AND STEEL