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. The method comprises the following steps of S1, ingredient, addingcalcium carbonate and sodium-based bentonite into red-lattice chromium-containing vanadium titano-magnetite, and preparing a medium-low-alkalinity mixture; S2, wet-mixing and braising, adding water which does not exceed 7% of the mass of the mixture, and uniformly mixing; and then standing is carried out, so that the humidity is uniformly distributed; S3, pelletizing is carried out, wherein 30r to 40r per minute is used on a disc pelletizer, the water spraying amount in the forming period of the mother ball is controlled to be every 10 g is provided with1ml to 2ml of mineral materials, and fully rolling and compacting the ore materials, increasing the water spraying amount in the growth period of the mother balls to obtain the diameter of 6mm to 13mm; S4, drying the green pellets; S5, placing the green pellets in a furnace to be heated to 900 DEG c to 950 DEG c , and in the heat preservation condition, introducing insufficient amount of air into the furnace for pre-oxidation roasting,wherein the roasting time is 10minutes to 20minutes; S6, and carrying out high-temperature oxidation consolidation roasting, introducing the increment air into a furnace of 1250 DEG c to 1300 DEG c to increase the oxidizing atmosphere, carrying out high-temperature oxidation consolidation roasting, and then cooling to room temperature to prepare the medium-low-alkalinity chromium-containing all-vanadium-titanium self-fluxing pellet.

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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