A method for preparing self-fluxing pellets of medium-low alkalinity chromium-containing all-vanadium-titanium

Abstract

The invention relates to a method for preparing medium-low alkalinity chromium-containing all-vanadium titanium self-fluxing pellets, which includes the steps: S1: Ingredients: adding calcium carbonate and sodium bentonite to red grid chromium-containing vanadium titanium magnetite; Prepare a mixture with medium and low alkalinity; S2: Wet mixed stew material: add water not exceeding 7% of the mass of the mixture, mix evenly, and then let it stand to make the humidity distribution uniform; S3: Ball making: Make it in a disc The ball machine is used to make balls at a speed of 30r / min-45r / min. During the cue ball forming period, the water spray volume is controlled at 1-2ml / 10g of mineral material to fully roll and compact the mineral material; during the cue ball growth period, increase Spray the amount of water to make pellets with a diameter of 6mm-13mm; S4: Dry the green balls; S5: Place the green balls in the furnace and raise the temperature to 900℃-950℃ for calcium carbonate decomposition and pre-baking; while maintaining heat, Insufficient air is introduced into the furnace for pre-oxidation roasting, and the roasting time is 10min-20min; S6: High-temperature oxidation consolidation roasting: Injecting incremental air into the furnace at 1250℃-1300℃ to increase the oxidizing atmosphere, and perform high-temperature oxidation After consolidation and roasting, and then cooling to room temperature, medium-low basicity chromium-containing all-vanadium-titanium self-fluxing pellets are obtained.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and ironmaking production, in particular to a method for preparing self-fluxing pellets of chromium-containing all-vanadium-titanium with medium and low alkalinity. Background technique [0002] Vanadium-titanium magnetite is a special magnetic iron ore in which iron, vanadium and titanium are symbiotic. Due to the symbiosis of iron and titanium, vanadium exists in titanium-magnetite in the same quality and shape, so it is called vanadium-titanium magnetite. . This kind of ore is distributed all over the world. Due to the differences in geological structure and ore-forming conditions, the characteristics of vanadium-titanium magnetite in various places are different. According to different types of vanadium-titanium magnetite, its smelting method and internal reaction properties of the smelting process There are also obvious differences. [0003] There are four major ore deposits in the ...

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Problems solved by technology

[0007] Based on the above-mentioned reasons, the present invention proposes a method for preparing self-fluxing pellets containing chromium-containing vanadium-titanium with medium and low alkalinity, so as to overcome the traditional production method of acid pellets that is prone to occur in the process of producing alkaline pellets. A series of technical problems, such as large amount of water absorption in the process of ore and ball making, low ball forming efficiency, easy bonding between cue balls, uneven composition, low ball forming rate caused by easy bursting after drying, and low ball forming rate after roasting The compressive strength is lower than the blast furnace requirements and the reduction pulverization rate is high.

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