I. Introduction Phosphorus mineral resources in Sichuan province can use to maintain reserves of 900 million t, an average grade of nearly 25% of the province can be developed using mining area at 33, it has been the development and utilization at 19, occupies reserves of nearly 240 million t. Mainly distributed in Leshan and Deyang, most of them can directly produce phosphate fertilizer and phosphorus chemical products without mineral processing . Currently, the province formed the Jinhe phosphate rock and phosphate rock Qingping two mining enterprises, the province's annual production capacity of phosphate rock more than 4 million t, Deyang, Shifang, Mianzhu has become a major phosphate production base. According to regional reserves, the reserves of Deyang City are less than 200 million tons, and the reserves of Qingping Phosphate Mine have been basically exhausted. For example, according to the current production, the service life of the two existing mines is less than 20 years; while the Mabian area of ​​Leshan has The reserves are more than 500 million tons, which is basically undeveloped. The sustainable development of phosphate rock and phosphorus chemical industry in Sichuan needs to strengthen the application of low-grade potassium-bearing phosphate rock [1] . In the case of inhibitors for phosphate ore beneficiation, Luo Huihua et al [2] conducted different experimental studies on carbonate-type phosphate rock in Mabian, Sichuan, and found that the high-efficiency reverse flotation inhibitor W-98 is compounded with sulfuric acid. The sorting effect is better. In this paper, a phosphate rock mine was sorted and the effect of inhibitors on flotation index was investigated. Second, the nature of the ore The results of multi-element analysis of raw ore are shown in Table 1. As seen from Table 1, the ore is a medium-low grade high- magnesium phosphate Third, the test method The ore grinding fineness - 200 mesh accounted for 68.92%. The agent used in the test: the mass fraction of H 2 S0 4 was 10%, the mass fraction of WF-01 was 1%, and the mass fraction of TXZ was 5%. The test flow is shown in Figure 1. Fourth, test results and discussion (1) Different inhibitor test results The effects of different inhibitors on phosphate ore flotation are shown in Table 2. From the test results in Table 2, it is seen that H2S04 is used as the inhibitor and WF-01 is the collector , and the phosphorus concentrate P 2 0 5 35.28%, Mg00.87%, and the recovery rate of 71.98% are obtained; and H 2 S0 is used. 4 and TXZ as a compound inhibitor, the obtained index is phosphorus concentrate P 2 0 5 34.11%, Mg00.92%, the recovery rate is 81.59%. The quality of the latter's concentrate decreased slightly, but the recovery rate was 9.61% higher than the former. Obviously, the effect of the compound inhibitor was significantly better than the original inhibitor. In terms of recovery rate, the beneficiation index using the compound inhibitor is better than the H 2 S0 4 alone or H 2 P0 4 alone as the inhibitor. The concentrate quality of H 3 P0 4 alone is higher than that of the other. Excellent, but the cost is higher than that of H 2 S0 4 and higher than that of H 2 S0 4 and TXZ compounding inhibitors. Therefore, considering the combination of H 2 S0 4 and TXZ compounding inhibitors in terms of indicators and economy Have a big advantage. (2) Sweeping time test The conditions of the third group of flotation reagents were kept unchanged, and the sweep test was conducted to investigate the effect of the sweep time on the flotation efficiency of the samples. The results are shown in Table 3. It can be seen from Table 3 that the extension of the sweeping time is conducive to the improvement of the concentrate index, but the recovery rate is slightly reduced. When the sweeping time is 2 min, the phosphate concentrate contains P 2 0 5 34.89%, Mg 01.01%, and the recovery rate is 83.75%. When the sweeping time is 2.5 min, the phosphate concentrate contains P 2 0 5 35.51%, Mg00 .94%, the recovery rate is 80.51%. Comprehensive consideration, extending the sweeping time is conducive to improving the quality of concentrate products. V. Conclusion Phosphate reverse flotation, the choice of inhibitors is very important, and has a great impact on the flotation process and product quality. In this paper, the original inhibitor and H 2 S0 4 and TXZ compound inhibitors were compared. It was found that with the compound inhibitor (H 2 S0 4 10 TXZ), the recovery rate of P 2 0 5 can be increased by 9.61%, indicating the effect. Significantly better than the single inhibitor H 2 S0 4 . In addition, the results of the sweep test show that prolonging the sweep time is conducive to improving the quality of concentrate products. In the reverse flotation test of the phosphate rock, further improvement of the recovery rate is required. references [1] Li Hujie. Development and utilization of Sichuan's dominant non-metallic minerals [J]. Journal of Southwest University of Science and Technology, 2002.17(3): 66-70. [2] Luo Huihua, Cheng Jing. Experimental study on different inhibition methods of reverse flotation of Mabian Phosphorus Mine in Sichuan [J]. Chemical Minerals and Processing, 2007, (11): 11-13. Box-beam production line Box-Beam Production Line,Automatic H-Beam Production Line,Automatic H Beam Production Line,H Beam Production Line Wuxi Zhouxiang Complete Set of Welding Equipment Co., Ltd. , https://www.beamweldingmachine.com