I. Introduction Molybdenite has good natural floatability. Since Emer first used fuel oil as a collector for molybdenite in 1902, hydrocarbon oil has been a typical collector for molybdenite [1] . At the same time, polar thiochemicals such as mercaptan, xanthate and black medicine can be well adsorbed on the "edge" surface of molybdenite, which is beneficial to improve the flotation recovery of molybdenite [2 , 3] . Thus, this paper Shaanxi some molybdenum ore, coal with oil as collector, respectively OSN-43, n-dodecyl mercaptan, butyl xanthate and tetrabutylammonium aerofloat as an auxiliary collector studied The influence of various auxiliary collectors on the flotation index of refractory molybdenum ore. Second, the nature of the ore The test ore sample is taken from the fault zone of a molybdenum ore body in Shaanxi, which basically represents the high oxidation rate of the main ore body of the mine. Microscopic identification and measurement results of an electron probe showed the metal ore minerals are mainly pyrite, magnetite, brass and molybdenite ore;. Gangue minerals biotite, quartz, feldspar, green clay Stone and so on. Molybdenum ore is mainly found in quartz veins and quartz, feldspar, and pyrite veins, and is most closely related to quartz, followed by feldspar, pyrite, magnetite and chalcopyrite. The molybdenum ore has a fine grain size, and about 60% of the molybdenite particles are less than 0.15 ram, which must be finely ground to fully dissociate the monomer. The molybdenum ore in the ore sample has a high oxidation rate (about 10%), and it is severely broken, and the mud is turned into a soil and a powder. Third, the test results and discussion (1) Influence of grinding fineness on flotation index According to the nature of the ore and the on-site production practices and requirements, the test uses a rough two-sweep process, as shown in Figure 1. The fixed grinding concentration is 735%, and the kerosene and pine oil are 12og/t. The effect of grinding fineness on the flotation index is examined according to the process shown in Figure 1. The test results are shown in Figure 2. Figure 1 Open circuit test process Figure 2 Effect of grinding fineness on flotation index Kerosene: 120g/t; pine oil: 120g/t 1-total recovery rate; 2-rough recovery rate; 3-grade It can be seen from Fig. 2 that as the fineness of grinding increases, the recovery of crude molybdenum and the total recovery rate increase and the grade of coarse concentrate decreases. Comprehensive consideration to determine the most suitable grinding fineness of -0.076mm accounted for 65%. (II) Effect of kerosene and pine oil on flotation index 1. Orthogonal test of oil and pine oil consumption Since kerosene has defoaming effect, there is a reasonable ratio between kerosene and pine oil. The interaction between kerosene and pine oil is examined according to the process shown in Figure 1. The test results are shown in Table 1. Table 1 Orthogonal test results of kerosene and pine oil It can be seen from Table 1 that the main effect of kerosene dosage and the interaction effect between kerosene and pine oil are significant. The effect of using kerosene at low dosage is better, so pine oil should also be selected as low dosage. 2. The best ratio test of kerosene and pine oil The amount of fixed kerosene is 100g/t. The optimum ratio of kerosene to pine oil is examined according to the process shown in Figure 1. The test results are shown in Figure 3. The best ratio test of kerosene and latitudinal oil Kerosene: 100g/t; grinding fineness: 65%-0.076mm 1-total recovery rate; 2-rough recovery rate; 3-grade It can be seen from Fig. 3 that the suitable ratio of kerosene to pine oil is 1:1 to 1.2. Considering the cost of the chemical, the suitable amount of kerosene and pine oil is 100g/t, and the molybdenum is obtained under these conditions. The coarse recovery of 6.7996 molybdenum concentrate was 78.73%, and the total recovery was 83.04%. (3) Effect of auxiliary collector on flotation index In order to improve the recovery rate of molybdenum flotation, four kinds of thio compounds such as OSN-43, n-dodecyl mercaptan, butyl xanthate and butyl ammonium black drug are used as auxiliary collectors, and the best kerosene obtained in the previous section. The dosage test was carried out under the conditions of the use of pine oil, and the test results are shown in Fig. 4. Figure 4 Effect of auxiliary collector on flotation index Kerosene: 100g/t; pine oil: 100g/t; grinding fineness: 65%-0.076mm 1-(butylammonium) total recovery; 2-(butyl yellow) total recovery; 3-(thiol) total recovery; 4-(OSN-43) total recovery; 5-(butylammonium) crude recovery; 6-Dinghuang crude recovery; 7_(thiol) crude recovery; 8-(OSN-43) crude recovery; 9-(butyl rib) grade; 10-(butyl yellow) grade; 11-(thiol) grade; 12-(OSN-43) grade It can be seen from the test results that 5~15g/t of the above auxiliary collector is added in the rough selection operation, the recovery of molybdenum and the total recovery rate are obviously improved, but the grades of coarse concentrates are decreased to different extents. . Among them, the effect of butylammonium black drug was the most significant. When 10g/t was added, the recovery of crude molybdenum and the total recovery rate increased by 4.23% and 4.71%, respectively, but the grade of coarse concentrate decreased from 6.79% to 2.72%. (4) Closed circuit test According to the results of the open circuit test, the effects of the butylammonium black drug on the molybdenum flotation index were further examined according to the closed circuit flow and the pharmaceutical system shown in Fig. 5(I) and Fig. 6(II): Fig. 5 only used kerosene and pine oil; Fig. 6 In addition to kerosene and pine oil, 5g/t butylammonium black is added to the roughing operation. The test results are shown in Table 3. Country 5 closed-circuit test procedure (no butyl ammonium black drug) Figure 6 Closed-circuit test procedure (Gentammonium black medicine) Table 3 % of closed circuit test results The closed-circuit test results showed that the addition of 5g/t butylammonium black drug in the rough selection operation increased the molybdenum recovery rate by 3.43% and the coarse concentrate grade by 3.68%, but the total beneficiation efficiency (E) increased by 1.77%. The butyl ammonium black drug can improve the flotation index of the refractory molybdenum ore. Fourth, the conclusion This paper is aimed at a refractory molybdenum mine in Shaanxi, using kerosene as a collector and pine oil as a foaming agent. The proper ratio of the two is 1:0.8. Kerosene in an amount of 100g / t, the aluminum is obtained containing 7.86% molybdenum concentrate crude recovery was 82.46%. Adding a small amount (about 10g/t) of polar thiochemicals as auxiliary auxiliary in roughing operation is beneficial to improve the recovery rate of molybdenum flotation, but the grade of coarse concentrate has different degrees of decline. The effect of ammonium black medicine is most pronounced. In the open circuit test, 10g/t butylammonium black was added to the rough selection. The recovery of crude molybdenum and the total recovery were increased by 4.3% and 4.71%, respectively, but the grade of coarse concentrate decreased by 4.07%. In the closed circuit test, it was thick. With the addition of 5g]t butyl ammonium black, the recovery of molybdenum increased by 3.43%, the grade of coarse concentrate decreased by 3.68%, but the total beneficiation efficiency (E Han ) increased by 1.77%. Therefore, the butyl ammonium black drug is beneficial to improve the flotation index of the refractory molybdenum ore. references [1] Bai Xingui. Data Analysis and Experimental Optimization Design [M]. Beijing: Tsinghua University Press, 1986. [2] Fang Kaitai. Uniform design and uniform design table [M] Beijing: Science Press, 1994. [3] Heilongjiang Institute of Civil Engineering and Architecture. Building Materials [M] Beijing: China Building Industry Press. 1982. [4] FW Braquebush (USA). Basic knowledge of paste filling systems [M]. [5] Moss (Canada) Paste - Future Filling Materials [M]. Steering System,Eps Performance Test Line,Steering System Testing Line,Electric Power Steering Wujiang Jinlan Machinery Manufacture Co.,Ltd , https://www.jinlan-technology.com