Aluminium dross is an industrial waste from aluminium refining industry and classified as toxic substances. However, the disposal of dross as a waste is a burden to aluminium manufacturer industries due to its negative effects to the ecosystem, surface, and ground water. Therefore the purpose of this study is to evaluate the influence of sodium hydroxide (NaOH) on the surface area and pore size of aluminium dross. There were 3 stages in the treatment activities, which were leaching, precipitation, and calcination process. The optimum result from this study was the surface area of aluminium dross increases from 10.1 m2/g up to 80.0 m2/g at 40°C, 1% NaOH, and 15-minute reaction time. Thus, aluminium dross has a potential to be converted into other useful material such as catalyst and absorbent. The benefit of this research is that the hazardous industrial waste can be turned into wealth to be used in other applications such as in catalytic activities and absorber in waste water treatment. Further investigation on the physicochemical of aluminium dross with different acid or alkali should be conducted to get deeper understanding on the aluminium dross as a catalyst-type material.

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Highly pure aluminum sulphate is an important chemical from the industrial point of view , especially for paper makers. It is also used for water treatments, dyeing of cloth, fire proofing fabrics, leather tanning and for cellulosic insulations. Dross is an industrial waste from aluminum production factories and is of wide varieties , being a problematic issue for aluminum producing factories, such as the Egyptian Aluminum company at Nag Hammadi which produces hudge amounts daily of such wastes needing either marketing , landfilling or processing to useful products. The present investigation exposes one of the processing ideas of changing the aluminum content of such waste either to impure aluminum sulphate solution, pure aluminum sulphate solution or aluminum sulphate in the solid form, using simple treatments at low temperatures so as to increase benefits and decrease costs of transformation. Laboratory studies proved the possibility of such transformations at temperatures ranging from 70 o C to 100 o C, using sulphuric acid. These results had been scaled-up for an engineering scope by the design of a semi-pilot scale sediment where the laboratory sedimentation results of the obtained aluminum sulphate had been tried. Results of the present investigation represent a step for environmental friendship by processing the daily dross waste at the Nag Hammadi "Egyptalum company", by increasing the income from selling such a waste to other purchasers ; whereby "the waste " dross will become an aluminum " by-product" .