Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2024
Thesis Language: Turkish
Student: Sinem ERDEMİR GURAN
Supervisor: Fatih Akkurt
Abstract:
Flocculants supplied from abroad are used in the flocculation stage of the production process of borax products. The consumption amount of flocculants in the process is quite high. Therefore, this situation makes us dependent on foreign countries. Therefore, domestic flocculant production is important in our country. In order to address this need, the use of different flocculants in the process was investigated with two different experimental studies and the appropriate flocculant properties for the process and the experimental working conditions with the flocculant after synthesis in the laboratory environment were determined. For the first stage experiments, suspension samples were obtained from the process before flocculant addition. For the second stage experiments, raw tincal ore was obtained. Firstly, surface charge measurements of the samples were performed and mineralogical and chemical analyses were carried out. Afterwards, liquid and solid samples were prepared and flocculation experiments were carried out to ensure the process conditions. Anionic, cationic and non-ionic flocculants with different properties were used in the experiments. The results of the two-stage experiment were evaluated according to the sedimentation rate and upstream turbidity data obtained after flocculation. Within the scope of the experiments; the effect of parameters such as flocculant type, dosage, load density, moleculer weight, suspension mixing speed and time, agitator level, suspension solid density on flocculation was investigated. In the flocculation experiments carried out in the laboratory, different dosages of flocculants were added for 800 ml suspensions and the best turbidity and settling velocity data were obtained at the optimum flocculant dosage (2 mg/L) with anionic flocculant (AN 905 VHM) with high molecular weight and low charge density. The optimum mixing speed of the flocculation suspension was determined as 150 rpm and the optimum mixing time was determined as 1 minute. In order to see the effect of flocculant feeding method, experiments were carried out with three different levels of agitator level and the best turbidity and settling velocity data were obtained at Level 1. In the flocculation experiments carried out with the suspensions prepared to see the effect of solid density, an increase in the optimum flocculant dosage amount was observed as the suspension solid density increased. The optimum flocculant dosage was determined as 2 mg/L when the solid density was 10% and 13%, and 3 mg/L when the solid density was 17% and 19%. As a result of the studies, suitable flocculant properties for the process and the working conditions in the laboratory environment with this flocculant were determined if the flocculant is synthesized for the process.
Key Words : Flocculation, turbidity, sedimentation rate, flocculant, optimum dosage, borax