In order to achieve the environmental policy of the South Aluminum Industries Complex, the anodizing unit, using advanced technologies in the relevant sectors, based on the highest environmental standards, has considered pollution control. For this purpose, different units have been designed and implemented as follows:
Anode Baking Pollution Control System (FTC):
In the anode Baking Plant, alumina adsorption method is used to purify pollutant gases from the cooking process in accordance with environmental requirements.
The smoke coming out of the chimney of the kiln is cooled by cooling towers to a temperature of 90 + 5 ° C and enters in the reactor. There, a certain amount of fresh Al2O3 and returned Al2O3 are injected to cause a reaction. After the reaction is complete, the smoke enters the bag filters to separate the gas and solid particles. Part of the enriched Al2O3 is transferred through air pressure tubes to an enriched alumina silo to be used in the Pot room and the rest is returned to the system to continue the process. After this process, the cleaned and purified gas is discharged into the environment through the chimney.
Pollution Control Unit (GTC):
It is responsible for purifying the exhaust gases from the regeneration hall. Harmful gases of the reduction cell are hydrogen fluoride (HF) and dust, which contains alumina (as the main raw material of the reduction process). Exhaust dust not only seriously pollutes the environment but also wastes raw materials. Dry scrubbing method is used in the reduction pollution treatment unit. In this method, hydrogen fluoride is absorbed up to 99.6% after passing through alumina and reacting with it, and enriched alumina is obtained. The alumina obtained from this process is divided into two parts. Part of it enters the alumina silo to be sent to the regenerating cell and the other part returns to the dust collector to perform the Dry Scrubbing process.
Anode smoke purification unit:
It is necessary to purify the exhaust bitumen vapors from the process subsets of the raw anode unit before entering the atmosphere. Bitumen vapors produced in the raw anode unit are treated through a dry refining process with coke powder in such a way that the flue gases are in accordance with environmental standards.
Gas and vapor purification unit from bitumen melting :
It is necessary to purify the gases and vapors produced during the operation of smelting bitumen and transferring molten bitumen. In the South Aluminum Industries Complex, the vapors produced during bitumen smelting operations are purified using the electrostatic deposition process, thus ensuring the necessary assurance of environmental and safety standards.