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

Abstract

The invention relates to a method of preparing high-alkalinity chromium-containing all-vanadium titaniferous pellets by adding calcium carbonate. The method comprises the following steps that S1, batching is performed, calcium carbonate and sodium-based bentonite ingredients are added into red-lattice chromium-containing vanadium titano-magnetite; S2, the mixture is divided into two parts, the first part of the mixture material is added with 3-4% of water by mass, the second part of the mixture material is added with the 6-8% of the water by mass, and wet mixing and leaving the materials to stand to ferment are performed correspondingly; and S3, material dividing and pelletizing are performed, pelletizing is performed on a disk pelletizer with revolving speed of 30-45 r / min, the water spraying amount is controlled to be 1-2 ml / 10 g of mineral aggregates, and the water adding and material feeding are performed per 30-100 seconds at intervals; the first part of mineral aggregates are used for pelletizing in the forming period of a master ball, and the second part of ore material aggregates are used for pelletizing in the growth period of the mother ball; S4, drying is performed; S5,the calcium carbonate is decomposed, pre-oxidated and pre-roasted, the calcium carbonate is decomposed and pre-roasted firstly at the temperature of 900-950 DEG C, and then insufficient amount of airis introduced into a furnace for pre-oxidation and pre-roasting; and S6, high-temperature oxidation consolidation roasting is performed, the incremental air is introduced into the furnace at the temperature of 1250-1300 DEG C to perform the high-temperature oxidation consolidation roasting, after sintering is completed, cooling is performed to prepare the high-alkalinity chromium-containing all-vanadium titaniferous 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.

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