Diseño de una planta de valorización de lodos generados en el tratamiento de efluentes del anodizado de piezas de aluminio

Abstract

The aim of this research was designed a plant valuation of the sludge generated in the treatment effluents from aluminum anodizing industry by pyro metallurgical and hydrometallurgical processes. On the one hand, with the hydrometallurgy is used for the recovery of the aluminum by acidic leaching and alkaline extraction (100 g/L, 1 %, 24 h and stirring at 600 rpm). Otherwise, with the pirometallurgy are calcined a different temperature (200 ºC until 1 200 °C, for 2 h and a heat rates10 °C/min). The best leaching agent was with sodic hydroxide, so the aluminum recovery was at 97, 48 %. This means that showing to be nine time more that the leaching agent acidic. In change, the calcination of the anodic sludge show a recovery aluminum of 99, 06 % at calcination temperature of 1 200 °C. The main phase was corundum α-alumina with 88 %. The best alternative was the pirometallurgy; therefore, the flow diagram were formed: the solar sludge drying, two electric furnace and a roll mil. This proposal is economically workable due to financial indices: PV = 157 461,00 USD, IRR = 24,38 % y C/B = 1,56