A low-cost carbon anode for electrolytic aluminum and its preparation method

Abstract

The invention relates to a low-cost carbon anode for aluminum electrolysis, and a preparation method thereof. Raw materials of the carbon anode comprise 80-85wt% of aggregate and 15-20wt% of a binder, the aggregate comprises 50-60wt% of carbonized rice husk having a granularity of 2-6mm and subjected to acid and alkali ash removal, 15-20wt% of anthracite having a granularity of 0-1mm, 12-16wt% of petroleum coke and 12-16wt% of artificial graphite having a granularity of 0-1mm, and the binder comprises 60-70wt% of a modified phenolic resin and 30-40wt% of modified asphalt. The preparation method comprises the following steps: preprocessing the aggregate, mixing with the binder, carrying out compression molding, roasting and cooling to prepare the carbon anode. The preparation method, which uses the carbonized rice husk and the anthracite to substitute the petroleum coke as a main aggregate, can mitigate Chinese petroleum import pressure and alleviate the petroleum scarcity crisis caused by the rapid industrial development to realize the effective utilization of byproducts of agricultural products and the reduction of the aluminum electrolysis cost.

Description

technical field [0001] The invention relates to a carbon anode for electrolytic aluminum and a preparation method thereof, in particular to a carbon anode for electrolytic aluminum produced by using carbonized rice husk and anthracite coke as raw materials and a preparation method thereof. Background technique [0002] At present, the 350~400KA electrolytic cell in my country has gradually become the mainstream cell type of aluminum electrolysis. With the enlargement of the electrolytic cell, the overall technology of the aluminum electrolytic cell has approached the international level, but the current domestic carbon anode consumption is about 490kg / t aluminum, and the electrode change cycle is in 30 days or so. Prebaked anodes for electrolytic aluminum have the largest output among domestic carbon products, but their service life and conductivity are far behind the international level, resulting in huge waste of materials and energy in my country's aluminum electrolysis in...

AI Technical Summary

Problems solved by technology

In recent years, with the rapid development of the national economy, the consumption of carbon products has been rising year after year, so that the cost of carbon prebaked anodes with petroleum coke as raw materials has been greatly increased. During the production of carbon anodes, coal tar pitch releases SO2 at high temperatures , CO2 and other harmful substances have a negative impact on the working environment. The more gas discharged at high temperature, the lower the yield of the product, resulting in a lot of waste; the gas removed by carbonization leads to the formation of many pores in the finished product. higher porosity

In normal aluminum electrolysis production, as the electrolysis proceeds, the carbon anode aggregate is oxidized, and the electrolyte easily penetrates into the pores, which undoubtedly speeds up the consumption of the anode