PART VI: Environment and waste management

Title: The Fractionated Precipitation Process of Zinc and lead Compounds in Ammonical Ammonium Carbonate Solutions

Author(s): Ali Ahmed, J. Tomas, W. Hintz, T. Günther

Address: University of Gezira | Otto-von-Guericke-University Magdeburg, Germany | Otto-von-Guericke-University Magdeburg, Germany | Otto-von-Guericke-University Magdeburg, Germany

Reference: First Sudanese Diaspora International Conference - 2009 pp. 199 - 206

Abstract/Summary: Chemical and metallurgical industries produce each year millions of tons of waste products containing low grade oxidized Zinc and other materials which contain toxic and harmful elements depending on their sources. This paper attempts to develop a process to fractionate precipitation of Zinc and Lead compounds using solvents of ammonia and ammonium carbonate forming different levels of leach types to which Electric Arc Furnace Dust (EAF) is added. A total mass of suspension was composed of mass of distilled water, mass of ammonium carbonate, mass of ammonium hydroxide and mass of EAF dust making 26 mass suspensions to each of which several parameters were applied. The parameters included system temperatures, pH values, carbon dioxide flow rate, using a reactor where these suspensions were subjected to different speeds of the stirrer, different conductivityv and different time. The research concluded by reaching an appropriate combination of the parameters which simultaneously achieved a break point that produced the desired optimum recovery of the heavy metal. This break point has the following specification: the optimum solution was 2746.9 (g) being composed of 39.14% distilled water, 19.5% Ammonium carbonate 16.33% ammonium hydroxide and 24.99 % EAF dust while the optimum level of carbon dioxide flow rate was 5 in/min, rotation speed was 700 rpm and temperature was 50 °C.

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