Method for producing roll collars by recycling tungsten carbide from waste hard alloy roll collars

Abstract

The invention discloses a method for producing roll collars by recycling tungsten carbide from waste hard alloy roll collars. The method includes the steps: recycling coarse-grain tungsten carbide serving as a raw material from the waste hard alloy roll collars, mixing the coarse-grain tungsten carbide with other raw materials according to a formula of the roll collars, placing the mixture into a rotary mill, adding industrial alcohol which has alcohol content more than 95.5% and account for 13.8%-15.7% of the weight of the raw materials into the mixture, milling the mixture for 22 to 24 hours, screening, drying, blending rubber, pressing, removing rubber, pressurizing 6MPa at the temperature ranging from 1410 DEG C to 1460 DEG C in a vacuum pressurizing sintering furnace for longer than 70min, and uncovering the furnace with the temperature not higher than 100 DEG C to obtain the hard alloy roll collars. The method is physical, pollution-free and low in cost, and the recycled tungsten carbide is complete in shape and unchanged in alloy property.

Description

technical field [0001] The invention belongs to the technical field of producing cemented carbide roll rings by using waste materials, and in particular relates to a method for producing roll rings by recovering coarse-grained tungsten carbide from waste hard alloy roll rings. Background technique [0002] Carbide roll rings are widely used, and its main raw material is tungsten carbide, which is generally produced by metal tungsten powder and carbon powder at present, and its price is relatively high; the current recycling method of tungsten carbide generally adopts electrochemical methods, zinc melting method, mechanical crushing method, etc. [0003] The electrochemical method requires the use of a large amount of chemical raw materials and consumes a large amount of electric energy. Due to the use of chemical raw materials, some harmful substances will be produced. If they are directly discharged, they will cause environmental pollution. Therefore, harmless treatment is ...

AI Technical Summary

Problems solved by technology

[0005] The zinc melting method is to add zinc at a temperature of about 900°C to form a zinc-cobalt alloy from Co, Ni and zinc in the waste cemented carbide, and then undergo vacuum furnace distillation to remove zinc at a certain temperature to form a spongy alloy block. Then it is crushed, and the ingredients are ground into raw materials. This method has large investment in equipment, high production costs and energy consumption, and it is difficult to completely remove zinc, resulting in unstable product quality and performance. The zinc used is harmful to the environment and has the problem of environmental pollution.