Study on the leaching of galena, sphalerite and pyrite in Huize lead-zinc mine

Huize lead zinc mine located in the northeast of Yunnan Province, is one of the high-grade lead and zinc. The Beijing Research Institute of Mining and Metallurgy has carried out in-depth research and analysis on the characteristics of ore. Based on small-scale experiments and semi-industrial tests, the company has developed a lead-sulphur asynchronous and other floatable process for sulfide ore [1 , 2] . The so-called asynchronous like sulfur can lead float refers mainly throughout lead flotation of sulfur, artificial, floating mineral slurry stages controlling the pH, inhibit the activation conditions and factors, action collector strength, to ensure that the mineral sulfur, lead Under the appropriate flotation conditions, the unique floatation is fully utilized [3]. The authors found that during the test galena, flash with planktonic difference between zinc and pyrite, galena and pyrite and planktonic and preferably similar floating sphalerite poor. In order to study the floating and asynchronous floating mechanism of Huize lead-zinc mine, this paper carried out a detailed flotation test on three single minerals to explore the selection basis of the lead-sulphur asynchronous and other floatable processes.

First, the test materials and methods

Galena, sphalerite and pyrite are taken from No. 6 ore body of Huize Lead-Zinc Mine. Through chemical analysis and phase identification, the purity of single mineral after purification is above 97%. The flotation test is carried out in the XFG type trough-type flotation machine. Each time, 1 g of the ore sample is weighed into a 30 mL flotation cell, and an appropriate amount of deionized ion is added, and the slurry, dosing, and floating are performed according to the flow shown in FIG. selected. Flotation size -01074+01038mm. After the flotation is finished, the concentrate and tailings are dried at a low temperature, weighed, and the recovery rate is calculated.

Figure 1 Single mineral flotation process

Second, the results and analysis

(1) Effect of ethyl xanthate on the planktonic properties of three minerals

It can be seen from Fig. 2 that the recovery rate of the three minerals gradually increases with the increase of the amount of the yellow medicinal herb. When the amount of thyroxine was increased to 2×10 - 4 mol/L, the recovery rate basically reached the maximum value, and almost no longer changed with the increase of the amount of thyroxine. The planktonicity of sphalerite is better than that of galena and pyrite, and the leaching of galena and pyrite is similar. It can be seen from Fig. 3 that galena has good floatation in the range of pH 2-12; sphalerite has better buoyancy in acidic, neutral and weak alkali medium, and is poor in strong alkali medium; yellow Iron ore has better buoyancy in weak acid, weak base and neutral medium, and is poor in strong acid and alkali medium.

Figure 2 Effect of the amount of thyroxine on mineral recovery

(natural pH 5.45 ~ 5.89)

Figure 3 Effect of pH on mineral recovery

(Yellow medicinal amount 2 × 10 - 4 mol / L)

(2) Effect of ZnSO 4 and soluble starch on the planktonicity of three minerals In the concentration of 2×10 - 4 mol/L of the xanthate flotation system, when ZnSO 4 and soluble starch were added, the amount and pH value were added. The influence of the other party's lead ore, sphalerite and pyrite on the planktonicity is shown in Figures 4-7.

1. Adjusting agent dosage test

Figure 4 Effect of ZnSO 4 dosage on mineral recovery (pH 8)

Figure 5 Effect of soluble starch dosage on mineral recovery (pH 8)

Figure 6 Effect of pH on mineral recovery (ZnSO 4 dosage 200mg/L)

Figure 7 Effect of pH on mineral recovery

(soluble starch dosage 20mg/L)

It can be seen from Fig. 4 that when the amount of ZnSO 4 is 200-800 mg/L, ZnSO 4 has a significant inhibitory effect on sphalerite, while the other side lead ore and pyrite have weak inhibition, and galena and pyrite The plankton is similar. It can be seen from Fig. 5 that when the amount of soluble starch is 20-80 mg/L, the soluble starch has a significant inhibitory effect on sphalerite, while the floatation of the ore and pyrite has little effect.

2. Adjusting agent pH test chart

It can be seen from Fig. 6 that when ZnSO 4 is present, the floatation of sphalerite is weak in the range of pH 6.5 to 10, and the leaching of galena and pyrite is strong. In the range of pH 6.5-7.5, galena has better floatability than pyrite. In the range of pH 7.5~12, pyrite has better floatability than galena. It can be seen from Fig. 7 that when soluble starch is present, soluble starch has a strong inhibitory effect on sphalerite in the range of pH 6-10, while the influence of the lead ore and pyrite is relatively small.

In summary, in the Xanthate flotation system, ZnSO 4 or soluble starch is used as the adjusting agent, and the leaching property of galena and pyrite is very similar under certain conditions and pH conditions. Therefore, the separation of sphalerite from galena and pyrite can be achieved by mixed flotation. This coincides with the industrial floatation and so on. The results of the single mineral flotation test show that under certain flotation conditions, lead-based mixed lead-sulphur flotation process can be realized, which proves the feasibility of lead-sulfur asynchronous and other floatable processes.

Third, the conclusion

1. The test results show that there is a difference in planktonicity between galena, sphalerite and pyrite in the same ore body of Huize Lead-Zinc Mine. In general, the three minerals have better buoyancy in weak acid, weak base and neutral medium, and poorer buoyancy in strong acid and alkali medium.

2. In the case that galena and pyrite maintain good planktonicity, ZnSO 4 and soluble starch can significantly inhibit sphalerite, which indicates the feasibility of adopting lead-sulphur asynchronous and other floatable processes in Huize lead-zinc mine. Further provide a theoretical basis for the lead-sulfur asynchronous and other floatable processes.

references

[1] Beijing General Research Institute of Mining and Metallurgy Research Yunnan Chihong Zinc and Germanium Co., deep mixed mineral flotation tests continuously expand [R]. Beijing General Research Institute of Mining and Metallurgy, 2003

[2] Beijing Research Institute of Mining and Metallurgy. Research on new mineral processing technology of complex refractory leaching lead-zinc sulfide oxidation mixed ore [R]. Beijing Research Institute of Mining and Metallurgy, 2003

[3] Li Fenglou, Stratum of Zhao pure recording, research and other asynchronous Mix Concentration flotation new technology [J] non-ferrous metals (MINERAL PROCESSING SECTION), (2): 30 to 36

Author unit:

Northeastern University (Chen Jinghua, Sun Chuanqi)

Beijing Research Institute of Mining and Metallurgy (Sun Chuanqi)

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