Method for using petroleum coke fine powder in preparation of prebaked anode used for aluminum electrolysis

Abstract

Belonging to production methods of carbon products, the invention discloses a method for using petroleum coke fine powder in preparation of a prebaked anode used for aluminum electrolysis, especially a production method of a prebaked anode used for aluminum electrolysis. According to the method for using petroleum coke fine powder in preparation of a prebaked anode used for aluminum electrolysis, the treatment method consists of: conducting screening with a standard sieve with a mesh of 1mm, drying the screened fine material with a size less than 1mm at a temperature of 90-120DEG C for 1-2h, then carrying out grinding to obtain fine powder with a size less than 0.074mm. The method employs the following materials: 82-84% of calcined coke, 14% of asphalt, and 2-4% of the fine powder. The method provided in the invention utilizes the petroleum coke containing 9-14% of volatile matters, which are mainly light low molecular carbon compounds, and makes use of the intrinsic self-binding and self-sintering properties of the petroleum coke, thereby reducing the adding amount of a binder in traditional carbon product formulas. Therefore, the method saves the calcination cost and the binder cost, and also reduces the calcination loss, dust loss as well as the discharge of calcined asphalt fume.

Description

technical field [0001] The invention belongs to a production method of carbon products, in particular to a production method of a prebaked anode for aluminum electrolysis. Background technique [0002] The powder coke content of less than 8mm used to prepare the prebaked anode petroleum coke is relatively high, especially the fine material less than 1mm is as high as 10%. Petroleum coke smaller than 1 mm has high volatile content and high thermal expansion coefficient, so it cannot be directly used in the production of prebaked anodes. Hazards brought by powder coke in the production process: affect the calcination operation, the finer the petroleum coke powder coke, the greater the volatile content, the discharge port is easy to coke or coke in the tank, the furnace body is blasted, the discharge valve canopy material, etc.; the calcination process is due to powder The calcined burning loss of coke content is as high as 5%, and the flying loss is as high as 3-5% before and...

AI Technical Summary

Problems solved by technology

[0003] At present, the powder coke content of petroleum coke used in the carbon industry is increasing year by year, which not only restricts the stability and improvement of product quality, but also increases production costs due to flying dust and affects calcination equipment

At the same time cause dust pollution to the environment