عنوان مقاله [English]
In this research, the monitoring and modification of the 0-3 mm processing circuit of the Semirom fireclay factory were investigated. The characterization results show kaolinite is the main mineral, while hematite and goethite are the iron minerals. Study of the polished sections and freedom analysis demonstrated that most of the hematite had been oxidized to goethite and spread in kaolinite particles. This circuit was monitored by sampling from different streams. The effect of parameters including feed rate, separator speed, and particle size, on iron removal, was investigated using a dry drum separator. Experiments with a roller separator with a magnetic field intensity of 10 kilogauss were performed to measure the possibility of further iron removal. According to the results of the experiments and the monitoring of the circuit, a new flowsheet was proposed by adding the roller separators to process the tailing of the first series of the plant separators as well as the final product, which allows the reduction of Fe2O3 grade to less than 1% and 5% increase in recovery in the final product.