Preparation method of electrolytic aluminum steel jaw aluminum ash protection ring

Abstract

The invention discloses a preparation method of an electrolytic aluminum steel jaw aluminum ash protection ring. The preparation method comprises the following steps: firstly, aluminum ash raw materials salvaged in casting of molten aluminum are cooled to reach a normal temperature, and are crushed by a ball mill; then, the selected materials are dryly mixed by a kneading machine, are added with a corrugated paper ash binding agent being 8-12% of the total weight of the raw materials, are wetly mixed by the kneading machine, and are put in a forming machine for vibration formation; and finally, a raw aluminum ash protection ring is roasted to 300+-10 DEG C, is heated by 30 minutes, and is cooled to the room temperature to obtain a finished aluminum ash protection ring. The waste aluminum ash is directly adopted as the raw materials, and is matched with the binding agent produced by corrugated papers to preferably solve the aluminum ash bonding problem to achieve the effect of changing wastes into wealth; and the preparation method can largely increase the recycling rate of the waste aluminum ash, largely reduces the enterprise production cost, is free of influence on an electrolyte system, prolongs the life of a steel jaw by 3 times, and also can reduce the aluminum oxide consumption by about 5 kg / tAL.

Description

technical field [0001] The invention relates to the technical field of equipment accessories in the electrolytic aluminum industry, in particular to a preparation method for a steel claw protection ring for electrolytic aluminum anodes. Background technique [0002] The electrolytic aluminum industry is a huge industry that provides many jobs and produces many sources of pollution. Aluminum ash is one of them. At present, waste aluminum ash has been included in the national hazardous waste list, and waste aluminum ash is confirmed as hazardous waste. For example, an aluminum electrolysis enterprise produces 500,000 tons of primary aluminum annually, but produces 5,000 tons of waste aluminum ash. Many companies dispose of aluminum ash by simply selling it out, which costs about 1,000 yuan per ton, and the annual recovery is only 5 million yuan. Waste and waste Great loss. [0003] At the same time, the cast steel claws used in the large prebaking tank have a high working en...

AI Technical Summary

Problems solved by technology

For example, an aluminum electrolysis enterprise produces 500,000 tons of primary aluminum annually, but produces 5,000 tons of waste aluminum ash. Many companies dispose of aluminum ash by simply selling it out, which costs about 1,000 yuan per ton, and the annual recovery is only 5 million yuan. Waste and waste great loss

[0003] At the same time, the cast steel claws used in the large prebaking tank have a high working environment temperature, and the diameter of each cycle is reduced by about 2.32mm due to high-temperature oxidation. The scale is very serious, which leads to the following problems: The electricity increases; secondly, the oxide skin enters the electrolytic cell through the surface shell material, direct scattering, etc., causing a significant increase in the content of primary aluminum and iron, which also increases the difficulty of packaging for casting and increases the loss; thirdly, the maintenance cost of steel claws Substantial increase, reaching tens of millions of yuan per year (capacity of 500,000 tons / year)

However, this method only uses aluminum ash as one of the raw materials, it still uses petroleum coke as the main raw material, and uses coal tar pitch as the causative agent, which weakens its effect to a large extent

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