Recycling Salt Cake Efficiently, Economically
A consortium tasked with developing an advanced flue-gas transfer system for an in situ salt cake recycling technology in aluminum recycling facilities, has added HRS Heat Exchangers S.L.U., Lorqui Murcia, Spain, to its ranks.
As part of Alusalt, HRS will have ownership of the flue-gas transfer system hardware. Processing of recycled aluminum generates byproducts such as salt cake and dross. The salt cake stream consists of aluminum, salt and oxide residue (nonmetallic product), which is a problem that needs addressing in a cost-effective way.
Alusalt aims to develop a system that will take the heat and pressure of the flue gas from the rotary furnace and reuse it to evaporate the water by using a single-stage forced-circulation evaporator. The new process would reuse all available energy that is lost during the aluminum recycling process and would not require additional energy for the salt-cake recycling.
The plan is for Alusalt to create a recycling system 10 to 15 times smaller than existing technologies that will make salt cake recycling more accessible, cost effective and safer for the environment. A new technology would reduce current recycling salt-cake operating costs by more than 75 percent, lifting cost-prohibitive barriers for new entrepreneurs to enter the market, HRS says.