چكيده به لاتين
Separation and extraction of valuable metals from the copper smelting furnace’s dust is so attractive; due to the high economic value of these metals and the ability to increase production efficiency, as well as especially due to the elimination of environmental problems and the prevention of the release of these dusts in the atmosphere, the discussion of recycling this filter powder in The world is an important and valuable issue. In this research, which is related to the filter powder of one of the copper smelting factories in Semnan city, Iran. According to the analysis of the powder, the percentage of elements is copper 25%, zinc1%, lead 10%, iron 7.4% and potassium, 6.5%. In the project of the recycling of this powder, iron and potassium elements are considered impurity and extraction of valuable elements copper, lead and zinc will be the goal of this research. So that in four stages, first: By using sulfuric acid leaching, all metals are converted from the oxide phase to the sulfate phase. Then we separate the solution from the obtained ash by filtration. Then, in order to extract the copper in the solution, the cementation process was used, which is a simple substitution reaction of oxidation-reduction, and the cemented copper product is obtained. Also, pH, Temperature, Time, and the amount of Iron powder were the factors for copper cementation that were examined. In the following stage, according to the graph of iron and potassium, it is observed that at pH = 5, complete removal of iron and potassium impurities is possible, and in the second step, according to the graph, at pH = 8, the zinc in the solution is precipitated as zinc hydroxide. It is given, the zinc deposition efficiency was about 99% in the second stage of deposition. Finally, the ash obtained in the leaching stage, which contains lead sulfate, is also leached using an innovative process in an alkaline environment and in the presence of Tartaric acid, and is extracted as lead tartrate and after calcination as lead monoxide, the efficiency of this stage of the process is around 91%.
