High temperature calcination method of electrolytic aluminum cathode scrap residue

Abstract

The invention discloses a high temperature calcination method of electrolytic aluminum cathode scrap residue. The method is characterized by comprising the following steps of: crushing and ball milling the electrolytic aluminum cathode scrap residue; separating powdered carbon through floatation; then removing iron-containing impurities from the powdered carbon through magnetic separation; and calcining the powdered carbon by a calcining furnace to remove fluoride salt and sulfur from the powdered carbon, thus obtaining high-purity powdered carbon. According to the invention, through direct high temperature calcination of the powdered carbon recovered from the electrolytic aluminum cathode scrap residue, the processes of asphalt blending, tar kneading and profiling are reduced, so that the method is simpler; and compared with calcined carbon blocks, the powdered carbon grains are small and quick in temperature rise, and can rapidly reach a high temperature over 1700 DEG C in the calcining furnace, so that sulfur and fluoride salt are gasified and released. Therefore, the calcination time is greatly reduced, and the calcination can be finished in 10-20 minutes, thus saving a large amount of heating time and electric energy. The calcined powdered carbon has the advantages of low volatile component, low sulfur, high purity and more balanced quality, and can be used as a high-quality carbon raw material.

Description

[0001] technical field [0002] The invention relates to a high-temperature calcination method for electrolytic aluminum waste cathode slag, in particular to a high-temperature carbon desulfurization and fluoride salt removal method. Background technique [0003] With the development of my country's economy, the demand for metal aluminum is increasing, and the production capacity of electrolytic aluminum is increasing year by year. The following is the production and data analysis table of electrolytic aluminum in various regions of the country from 2009 to 2010: [0004] Unit: 10,000 tons [0005] [0006] It can be seen from the above table that the cumulative output of electrolytic aluminum nationwide in 2010 was 15.0225 million tons, a year-on-year increase of 24.88%. Based on the 726,000 tons of electrolytic aluminum output in Guizhou in 2010, 36,000 tons of fluoride salt was consumed, more than 400,000 tons of carbon products were produced, and more than 100,000 to...

AI Technical Summary

Problems solved by technology

The applicant found that in the disclosed technology, the obtained carbon material needs to be kneaded and pressed with pitch and tar to prepare carbon products. The process is relatively complicated, many equipments are used, the heating time is long, and the energy consumption is large.

Images