Abstract: Microcrystalline graphite, also known as amorphous graphite, is named for its small crystal structure. The particle size of the microcrystalline graphite is small, and the flotation foam is easy to physically polymerize with the fine gangue during fine grinding and purification, resulting in unsatisfactory flotation and purification effect. Especially because the higher the fixed carbon content is, the higher the viscosity of the flotation foam is, the heavier the physical entrainment in the foam product, resulting in the current production problems such as long selection process, low product quality, and high production power consumption.In this paper, the variation rule of half-life of flotation froth under different dosage of sodium chloride and 2^# oil is compared and studied. It is confirmed that adding sodium chloride can improve the flotation index of microcrystalline graphite, and is verified by actual ore. The research results can provide reference for industrial application and popularization of microcrystalline graphite flotation.