Abstract: In order to provide higher efficiency and higher quality reagents for flotation in Tonglushan Concentrator，the upgrading and transformation scheme of the preparation room was studied in view of the safety and environmental protection problems such as aging facilities，great safety hazards and strong odor of reagents in the old preparation room of the concentrator. The operation status of the old preparation room of the concentrator is analyzed. The two transformation schemes are compared in the aspects of site selection， engineering matters and advantages and disadvantages of the new preparation room. Finally，the chemical scheme of dismantling the old preparation room and building the new preparation room is determined. Through the implementation of the chemical scheme and the upgrading of the new preparation room，the labor intensity of workers is reduced，the related safety and environmental protection problems are solved， and remarkable environmental benefits are achieved，which meets the requirements of scientific and green development of mines.

Key words: preparation room, chemicals, xanthate, pine oil, upgrading and transformation