Sharif Digital Repository

Crystallization of Aluminum Hydroxide is the most important section of the Alumina production processes as the product yield and crystal size distribution (CSD) of this stage strongly affects the whole Alumina production process. In this work to simulate the crystallization in industrial steady precipitation tanks two Population Balance based models developed. First one is the Coupled CFD-Population Balance Model which considers the effects of flow hydrodynamics on crystallization kinetics and CSD. For development of this model the computational fluid dynamics software ANSYS FLUENT has been used. The two phase flow field has been simulated using Eulerian granular multiphase model coupled... 

Almost all of the country's industrial enzyme needs are met through imports. In this regard, much attention has been paid to industrial production of detergent enzymes such as protease, lipase, amylase and cellulase. Proteases, are the most important industrial enzymes with 60% of the world's enzyme market. Extracellular alkaline proteases of microbial origin are most widely used in the laundry detergent industry to help clear protein stains on clothing caused by blood, milk, eggs, and meat. In this study, bacterial alkaline protease enzyme produced by Bacillus subtilis ATCC6633 was used as a model of functional enzymes in detergent industries.Enzyme immobilization-drying operations are one... 

In this study, the feasibility and optimization of recovering uranium from the tailings of the Meidok copper plant using heap leaching on a laboratory scale were investigated. The initial phase involved evaluating the agglomeration process and stabilizing particles. Parameters such as drum speed, acidity level, coarse-to-fine particle ratio, and residence time were examined and optimized. Following the optimization of the agglomeration process, column leaching tests (heap leaching method) with dimensions of 50 cm in height and 10 cm in diameter were performed. The selection of an appropriate and optimized heap leaching system considered parameters like solution injection rate, pH, and...