关键词: KOH, 亚熔盐, 钽铌矿, 浸出

Abstract: Production of lignin peroxidase (LiP) and manganese peroxidase (MnP) in three kinds of reactors (stirred tank reactor, bubble column reactor and aeration reactor) by Phanerochaete chrysosporium was studied. High activity of enzymes, especially for LiP, was obtained in the aeration reactor. The production of enzymes and decoloration of orange I were investigated in semi-continuous culture and continuous culture respectively. High activity of enzymes for a long period of time was detected in the semi-continuous culture, in which five batches of dye wastewater could be decolored to more than 90% and the specific decloration rate of orange I was above 46.7 g/(g×d) when the proportion of replacement was 1/2, while enzymes decayed rapidly and poor decoloration was gained in the continuous culture. The application of semi-continuous culture in the aeration reactor was tried for the decoloration of four batches of printing-wastewater, and the decelerations rate of the first three was all above 90%.

Key words: KOH, sub-molten salt, niobium–tantalum ore, leaching