Aluminum dross hot and cold treatment recovery methods

Aluminum dross hot and cold treatment recovery methods

Aluminum dross hot and cold treatment recovery methods

Aluminum dross is a valuable by-product generated in the aluminum smelting process of any aluminium smelter or aluminium foundry.

Aluminum dross is not a waste but a valuable by-product of the smelter.

The amount of aluminum dross generated in the melting is a big quantity each year for some big smelters.

The storing of this aluminum dross in the factory area not only causes resource waste but also causes environmental pollution.

Therefore, the research on the comprehensive utilization technology of aluminum dross has a great economic and social benefits.

Aluminium dross hot and cold treatment recovery method

At present, there are many methods for recovering aluminum from aluminum dross, which can be roughly divided into two classifications: heat treatment recovery method and cold treatment recovery method. The aluminum recovery rate in these methods can reach more than 80%.

The heat treatment recovery method is mainly aimed at primary aluminum dross (white dross), which is a mixture of aluminum oxide and aluminum metal with the metal content varying from 15 to 80%. The aluminum content of this dross is usually from 15- 80%.

The cold treatment recovery method is mainly for secondary aluminum dross.

The aluminum dross treated by the heat treatment recovery method still contains a certain amount of aluminum, and the cooled metallic aluminum forms small particles, the aluminum content varies from 7 to 35% and in special circumstances as high as 50%.

It can be generally recovered by screening, gravity concentration, rotary furnace method or electrical concentration method.

1. Screening

After cooling, the heat-treated aluminum dross that is processed by aluminum dross machine will be ground and crushed by the ball mill.

During ball milling, aluminum metal and other components in the dross will be separated and reach different particle sizes that are suitable for recycling, through the impact, grinding and crushing of the ball mill medium, aluminum dross will be screened in different grades for the recovery.

Aluminium dross processing machine, dross cooling and ball mill and sieving machine, one completed solution for the dross recycling.

2. Gravity concentration

The main equipment of gravity beneficiation treatment of aluminum dross is a table concentrator.

This method has been widely used in the sorting of precious metal ores such as tungsten, tin and gold.

The principle is to use the density of metal and gangue particles, it is separated in an environment where water is the main medium.

This method is more suitable for processing aluminum dross after the heat treatment recovery method (which can be called secondary aluminum dross).

3. Rotary kiln method

The rotary kiln method is a more commonly used method for aluminum dross treatment.  

It has greater advantages in terms of mechanization and environmental protection.

The premise of adopting this method is to ensure that there is enough aluminum dross, so this processing method is suitable for the smelters with large aluminum dross generated from the furnace and requires recycled aluminum smelters with an annual output of more than 20,000 tons.

4. Electrical concentration

The principle of electrical separation is a beneficiation method that utilizes the different electrical properties of various materials.

The electric separation equipment has a rotating drum with good grounding. At the same time, there is a high-voltage DC electrode near the rotating drum.

This electrode generates an electric field against the rotating drum.

There is a hopper at the top of the rotating drum.

Aluminium dross continues to fall on the surface of the drum and enter the corona field.

At this time, all the components in the aluminum dross are charged, and the electrical properties of aluminum are different from other substances.

The charge obtained by the aluminum particles is immediately transferred to the ground by the drum and lost.

After the charge, under the action of the centrifugal force and gravity of the drum, aluminum particles fall, but the non-conductor has a charge, is adsorbed on the drum, is taken to the other end, and then passed through the brush, the falling point of the two is obviously different So that aluminum and non-aluminum substances in aluminum dross can be effectively separated.

Aluminum dross is a kind of renewable resource with comprehensive utilization value.

All smelters should pay attention to the combination of the recycling process and residual dross application technology to avoid the residual dross being buried deeply because of being unusable, causing environmental pollution.

The above comprehensive utilization technology of aluminum dross can realize the recycling of aluminum dross, fully develop the value of aluminum dross, reduce the environmental pollution of aluminum dross, and create higher economic benefits and social benefits.

Brightstar Aluminum Machinery provides automatic and energy-saving aluminum dross processing machine, dross cooling machine, ball mill and sieving machine for our customers, which can achieve high-efficiency utilization of aluminum dross.

Contact us now for a reliable no-obligation quote on your aluminium dross machine. The total solution and package deal!