According to data analysis properties of the ore, Zinc ore will manage the case of lead-zinc ore Refractory high low lead zinc, natural environment and in accordance with the general principles of the floating lead and zinc can be lead and zinc, the zinc can be preferentially floating lead depressant The selection process or the mixed flotation process of lead-zinc mixing and then lead-zinc separation or floatable processes such as lead and zinc. The specific measures are as follows:

First, fine grinding.

Second, the use of lime to adjust the pH value of the pulp, by adjusting the pH value of the pulp under the alkaline conditions to inhibit zinc and lead.

Third, the combination of (ZnSO ₄ + YN) high-efficiency sphalerite inhibitor.

4. An effective conventional chemical sulfur-nitrogen collector or combination collector using galena.

5. Adjust the dosage of collectors appropriately and increase the recovery rate of lead and zinc.

6. Floating zinc under alkaline conditions.

Laboratory beneficiation test

The test mainly adopts two schemes, namely: (lime + ZnSO ₄ + YN) zinc-suppressing and floating lead scheme and the regulation of slurry potential zinc-suppressing and floating lead by lime. The experiment first explored the types of lead collectors and found that SN-9 ^# has good selectivity to lead and the agent is environmentally friendly, meeting the requirements of cleaner production. At the same time, the test carried out the closed-circuit process of the two kinds of schemes for the pharmaceutical system and process parameters of the two schemes. See Table 1.

Table 1 Small closed-circuit test indicators of two kinds of Fangning /%

It can be seen from Table 1 that the two schemes used have obtained high quality lead-zinc concentrate. Explain that the selected clean and efficient collector SN-9 ^# has good selectivity for lead minerals, whether it is the combination of the first solution (ZnSO ₄ +YN) or the lime control potential of the second scheme. The lead and zinc separation environment is better, and the selection process is simpler, not afraid of the influence of slime, no need to remove mud. Among them, the scheme only adds one kind of agent to the on-site process, and the YN dosage is not large. The collector is selected. The dosage is small and the second method uses lime. The other inhibitors are not used, and the pharmaceutical system is simpler. Therefore, the cost of mineral processing is not high, which will be very beneficial to the mine to improve economic efficiency. From the test results and considering the parameters of the process operation, the industrial test on the first scheme is recommended first.

Table 2 Complex refractory lead-zinc ore clean high-efficiency beneficiation new process industrial test and industrial production application index /%

Although it is subject to objective conditions, after the new process, in the case of lead containing 1.31% lead and 8.68% zinc, 66.34% of lead is contained, 7.60% of zinc is contained, and the recovery rate of lead is 57.14%. The lead concentrate has a lead concentrate of 1.57% and a zinc content of 56.13%, corresponding to a zinc recovery of 76.64%. Compared with the original process, the lead concentrate grade and recovery rate increased by 11.89% and 0.89%, respectively, and the zinc concentrate grade and recovery rate increased by 0.23% and 2.60%, respectively. At the same time, the zinc content in lead concentrate decreased from 11.71% of the original process to 7.60%. At the same time, it can be seen that the application of the new process does not reduce the zinc content in the tailings. The zinc content in the tailings is as high as 2.23%. From the chemical analysis of the tailings, it can be seen that the oxidation rate of zinc in the tailings is as high as 90%, so it is difficult to comprehensively recover this part of zinc in the new process system, so it is necessary to reprocess the tailings.

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