Dross Press
The function of the aluminum dross press system is to recover the maximum amount of metal in the smelter itself, and at the same time to rapidly cool the dross to 350 ℃ and reduce its oxidation process, thus allowing for greater metal recovery in secondary processes.
The working principle of the dross press is to extract liquid aluminium from still-hot dross, giving the necessary pressure, squeezing the liquid aluminium and rapidly cooling the dross, causing a rolling effect on the shell during the pressing process. In other words, the small metal particles still residing in the dross coagulate in the pressing process in the form of sheets, forming what we call a dross shell. The fact that the aluminium still residing in the dross is coagulated in this way making it possible to obtain higher percentages of aluminium recovery in the secondary processes, and therefore provides added value to these dross.
The pressing effect of the hot dross generates a triple effect:
• It recovers aluminium metal by pressing effect and draining to a mould at the bottom: Aluminium ingot.
• It quenches the thermitic effect of the dross,drowning it by the pressing effect.
• It generates a metal shell containing the dross,being a pressed package with the oxides, which facilitates its handling
This process recovers part of the metal in the smelter (20 to 30%), and minimises the oxidation of the aluminium that remains in the dross. We still have a residue, but we have recovered the dross, extracting part of the metal,leaving a dross rich in aluminium (45 to 55%).
Aluminum Dross Press System Advantages:
• High recovery with rapid cooling, avoids additional oxidization and reduces the possibility of thermitic reactions.
• Increases recovery from 5 to 40% depending on practices and alloys.
• Improves recovery in secondary recycler by 10-20% (if today <50%).
• Reduces waste storage and facilitates handling
• Minimises fume generation
• Another advantage of the formation of this solid dross shell is the reduction in the amount of dust generated, which can be easily handled and stored.
Prevention to avoid thermic effect:
To minimize the thermic effect of dross, it is advisable to establish guidelines to reduce metal losses.
◆ Avoid charging Scrap into the burner flame.
◆ Avoid pushing scrap up to the roof of the furnace in direct contact with the flame can start the thermite reaction.
◆ Avoid flame impact on the dross.
◆ Removing all dross every melt cycle and the furnace should be skimmed every melt cycle.
◆ Avoid additions of exothermic fluxes, a complete waste of money and higher cost in lost aluminum, should be more effective practice adding fluxes (little or no fluxes)
Conclusion:
The hot aluminum dross extracted from the smelting furnace will be oxidized in the air, and the aluminum dross press system can quickly force cooling of the aluminum dross to reduce the loss of metal and the impact of the smoke and dust emitted on the environment. Technological innovation is also based on people's needs to develop, the use of some equipment to maximize recycling, reduce the loss of resources, not only improve the efficiency, but also play a role in protecting the environment. If you are interested in our dross press, dross pan, sow mold etc. equipment, please contact us at tech@huan-tai.org.
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