Separation of alumina from the paint sludge of automotive industry by leaching method

Subject Areas : environmental management

Mostafa Khezri ¹ , Fateme Abdollah ²

1 - Professor of Environmental Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran.
2 - MSc. in Environmental Engineering -Water Resources, Science and Research Branch, Islamic Azad University Tehran, Iran.

Received: 2013-07-13 Accepted : 2014-06-07 Published : 2014-07-23

Keywords: Automotive industry, Paint sludge, Alumina, Leaching, Saipa Automotive Manufacturing,

Abstract :

Paint sludge of automotive industries, due to having heavy metals, unbaked polymers, organic andinorganic pollutants, has been classified as a hazardous waste. For this reason, its proper disposal isfaced with many problems. Various methods yet have been developed by the great automobilecompanies of the world to reduce the environmental impacts of paint sludge. One of the effective aneconomical methods for reduction of pollution is separation of heavy metals from paint sludge. Thepresent study was carried out to investigate the pollution of paint sludge from automotive industry, toreduce its pollution to environmental standard levels, and to recover alumina from the paint sludgethrough leaching method. After XRD and XRF tests on paint sludge, it was found that the amount ofalumina is relatively high. Separation of alumina was considered because of its economic value andvarious applications in different industries. After utilizing the common separation methods, it wasrevealed that by optimizing the parameters such as temperature, sludge particle size, and sulfuric acidconcentration through the leaching method, about 70% of alumina can be recovered

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