Special binder for corundum slag pellets and its preparation and use method

Abstract

The invention belongs to the technical field of comprehensive utilization and processing of secondary resources, and relates to a special binder for corundum slag pellets and a preparation and use method thereof. The technical problem to be solved by the present invention is to provide a special binder for corundum slag pellets that can improve the pelletizing rate and strength of the pellets. The special binder is prepared from the following raw materials in weight ratio: 65-70% of plant starch, 4-5% of high molecular polyanion cellulose, 16-18% of plant dextrin and 10-12% of curing agent. The special binder for corundum slag pellets of the present invention has high viscosity, which can improve the viscosity of corundum slag materials, ensure the ball forming performance, initial strength and later drying strength, the ball forming rate can reach more than 95%, and the initial strength can reach 2 meters high. Drop once without breaking, and later drying strength reaches 2 meters high, drop 3 times naturally without breaking. The use of the binder of the invention significantly improves product quality, reduces the cost of the binder by 50 yuan / ton, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization and processing of secondary resources, and relates to a special binder for corundum slag pellets and a preparation and use method thereof. Background technique [0002] The aluminothermic method is currently the main method for producing ferrovanadium in China. The aluminothermic method uses aluminum particles as a reducing agent to produce ferrovanadium. Lime is used to adjust the composition of the slag to reduce the melting point and viscosity of the slag. At the same time, it is used as a coolant to adjust the excess heat energy. The main component of the slag (corundum slag) produced by the above process is Al2O 3 , there is a certain amount of calcium magnesium oxide and other impurities, and the scope of comprehensive utilization is narrow. [0003] At present, there are studies on crushing and processing corundum slag into materials with a particle size of 0-2mm, and pre...

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Problems solved by technology

Due to the fine particle size, light specific gravity, poor hydrophilicity and small compression ratio of the corundum slag material, during the test production period, plant starch was used as the binder, and the amount of binder added reached 5.0% of the total weight of the material. During the production process, there are still poor material viscosity, large amount of water added (about 20%, which is not conducive to the next step of drying), poor ball forming (initial ball forming rate is less than 80%), and low strength (the initial strength is broken at 1.5m, and the later strength is 2m Falling and breaking, the powder surface ratio is greater than 20%), which directly leads to the failure of product quality to meet the technical requirements of post-processing technology, resulting in high cost of binder

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