Optimizing the Settling Parameters of the Final Tailing of Zonouz Kaolin Processing Plant using RSM

In this research, solid phase settling process from the liquid phase were optimized simultaneously on the different responses, using the response surface methodology (RSM). The effect of solid percentage, flocculant dosage, temperature, and pulp pH were evaluated on the responses of solid settling velocity, water turbidity, viscosity and density of settled pulp. The results showed that by increasing the flocculant dosage from ۰.۵ to ۳.۵ g/ton, settled pulp viscosity decreases from ۴۹.۰۵ cSt to ۱۷.۵۴ cSt. The higher values of pulp pH as well as low amount of solid percentage resulted in high water turbidity, which shows the lack of contact between flocs and suspended particles. The results indicated that the pulp solid percentage and the flocculants dosage are the most significant parameters on the responses. Optimum test conditions were obtained in industrial mode by using ۵ g/t flocculant, solid percentage ۲۳.۹۶%, pH=۷.۵ temperature of the pulp ۲۱.۵°C in which condition, settling rate, pulp viscosity, pulp density and water turbidity were predicted to be ۱۳.۲۳ cm/min, ۵.۱ cSt, ۱.۶۱ g/cm۳ and ۱۵.۷ NTU respectively. Repetition test in the model predicted optimum condition was carried out and verified the predicted optimized condition.

کلیدواژه ها:

Settling rate ، Tailing ، Optimization ، RSM ، flocculation