Statistical Modeling Studies of Iron Recovery from Red Mud Using Thermal Plasma

Abstract

Optimization studies of plasma smelting of red mud were carried out. Reduction of the dried red mud fines was done in an extended arc plasma reactor to recover the pig iron. Lime grit and low ash metallurgical (LAM) coke were used as the flux and reductant, respectively. 2level factorial design was used to study the influence of all parameters on the responses. Response surface modeling was done with the data obtained from statistically designed experiments. Metal recovery at optimum parameters was found to be 79.52%.

An Overview of Thermal Plasma Arc Systems for Treatment of Various Wastes in Recovery of Metals

“…A combined process of thermal plasma technology followed by acid leaching enhanced the metal recovery step from e-waste. The extended arc plasma torch system has treated e-waste for the production of valuable metals such as Cu, Al, and Fe [34]. A schematic flow chart for the plasma treatment of solid waste is shown in Figure 7.…”

Extraction of aluminum and iron from bauxite: A unique closed‐loop ore refining process utilizing oxalate chemistry

“…Numerous researchers have worked on the recovery of valuable metals from red mud using both pyrometallurgy and hydrometallurgy. [12][13][14][15][16] Pyrometallurgy is energy intensive, whereas hydrometallurgical processes using inorganic acids (e.g., sulfuric acid and nitric acid) poses significant environmental risk from the emission of SO X and NO X . The large amount of acid initially involved for neutralizing the caustic red mud and the handling of effluents create an additional burden on the red mud processing.…”

Extraction of Aluminum and Iron from Bauxite: A Unique Closed-Loop Ore Refining Process Utilizing Oxalate Chemistry

“…Numerous researchers have worked on the recovery of valuable metals from red mud using both pyrometallurgy and hydrometallurgy. [12][13][14][15][16] Pyrometallurgy is energy intensive, whereas hydrometallurgical processes using inorganic acids (e.g., sulfuric acid and nitric acid) poses significant environmental risk from the emission of SO X and NO X . The large amount of acid initially involved for neutralizing the caustic red mud and the handling of effluents create an additional burden on the red mud processing.…”