A method for preparing high-basicity chromium-containing all-vanadium-titanium pellets by adding calcium carbonate

Abstract

The invention relates to a method for preparing high alkalinity chromium-containing all-vanadium titanium pellets by adding calcium carbonate, which includes the steps: S1: Ingredients: adding calcium carbonate and sodium bentonite ingredients to the red grid chromium-containing vanadium titanium magnetite; S2: Divide the mixture into two parts. Add 3-4% of the mass of water to the first part and 6-8% of the mass of the material to the second part. Wet mix them separately and let them stand for stewing; S3 : Material separation and pelletizing: Make balls on the disc pelletizing machine at a speed of 30‑45r / min. The water spray volume is controlled at 1‑2ml / 10g of mineral material. The interval between adding water and materials is 30s‑100s; during the cue ball forming period, use the third One part of the mineral material is pelletized, and the second part of the mineral material is used for long-term pelletizing in the cue ball; S4: drying; S5: pre-roasting of calcium carbonate decomposition and pre-oxidation: first decompose calcium carbonate at 900℃-950℃ Pre-baking, and then introduce insufficient air into the furnace for pre-oxidation and pre-baking; S6: High-temperature oxidation consolidation roasting: Inject increasing amounts of air into the furnace at 1250℃-1300℃ for high-temperature oxidation consolidation roasting and sintering. After completion, it is cooled to obtain high alkalinity chromium-containing all-vanadium titanium pellets.

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 high-alkalinity chromium-containing all-vanadium-titanium pellets. 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 vanadium-titanium-magnetite met...

AI Technical Summary

Problems solved by technology

[0007] Based on the above reasons, the present invention proposes a method for adding calcium carbonate to prepare high-basic chromium-containing all-vanadium-titanium pellets, 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 mineral powder and pelletizing, low pelletizing efficiency, easy bonding between cue balls, uneven composition, low pelleting rate caused by easy bursting after drying, and low pelleting rate after roasting. The compressive strength is lower than the blast furnace requirement and the reduction pulverization rate is high.

Images