Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2019
Thesis Language: Turkish
Student: AHMET GÜN
Supervisor: MUZAFFER BALBAŞI
Abstract:It is an inevitable fact that technology uses wastes as raw materials in the near future. Nowadays, the recycling of used metals has gained importance as much as the recovery of precious metals from natural sources. Gold is used in various fields such as electronics industry, aerospace, construction, medicine, textile sectors, coating and decoration arts, an investment tool. However, recycling of scrap gold and gold in the waste generated during production can be recycled by means of related facilities. In this study, the optimization of the process conditions was studied in a facility that recycles gold from activated carbon sludge containing waste gold. Laboratory scale experimental studies were planned according to two-level factorial design and response surface experimental design methods. These methods can be used in the optimization of process conditions in the industrial field and can provide scientific inferences based on statistical models so that the process can be easily understood and improved by an economic number of experiments. In experimental planning, the main parameters which have a direct effect on the process and the two and three interactions between these parameters are investigated based on experimental data. In the two-level factorial design method, the main parameters were used for urea and sodium metabisulphite based on stoichiometric amounts, and the temperature was included as a third parameter. The results showed that the temperature had no effect on the process. However, the other two parameters interact with each other in a nonlinear way. According to this result, response surface experiments were planned and realized by removing the temperature parameter. As a result, the statistical model showing the relationship between the amount of gold used in the recovery process and the amount of gold obtained was derived. Optimal working ranges can be estimated for maximum gain using the model. According to the results obtained from the factorial design experiments, the stoichiometric ratios of urea and SMB calculated from the gold precipitation reactions are used in 1,275 times or more and provide 100% precipitation efficiency