Combined collecting agent for flotation separation of lead-zinc sulfide ore and application of combined collecting agent

Abstract

The invention discloses a combined collecting agent for flotation separation of lead-zinc sulfide ore and application of the combined collecting agent. The combined collecting agent comprises a pyridine derivative and ethyl xanthate, and the pyridine derivative is one of 2-picolinic acid, 6-methyl-2-picolinic acid, 2-picolinic acid methyl ester and 2, 6-picolinic acid; the combined collecting agent serves as a collecting agent of galena and is used for flotation separation of galena and sphalerite. The method comprises the steps that raw ore is crushed, ground and then mixed, combined inhibitor zinc sulfate and sodium sulfite, a combined collecting agent and a foaming agent are sequentially added into ore pulp for lead flotation operation, and lead concentrate and lead tailings are obtained; an activating agent, a collecting agent and a foaming agent are sequentially added into the lead tailings for zinc flotation operation, and zinc concentrate and zinc tailings are obtained; the combined collecting agent is high in galena selectivity, the use amount of a sphalerite inhibitor can be reduced, meanwhile, the use amount of a subsequent sphalerite activator is reduced, and the beneficiation cost is reduced while the lead-zinc sulfide ore separation effect is improved.

Description

Technical Field

[0001] The invention relates to a combined collector for flotation separation of lead-zinc sulfide ores and application thereof, and in particular to the technical field of mineral separation. Background Art

[0002] Lead-zinc ore is an important strategic mineral resource for the nonferrous metal industry. Due to its special and excellent physical and chemical properties, it has been widely used in aerospace, electronic military, chemical industry and medical fields. Galena (PbS) and sphalerite (ZnS) are primary minerals of lead and zinc, and often coexist densely in sulfide deposits. Since galena has better natural floatability than sphalerite, sphalerite is usually suppressed in the flotation separation process, and galena is floated preferentially.

[0003] In flotation separation, collectors are usually used to expand the wettability differences of different minerals, so that bubbles carry hydrophobic mineral particles to the gas-liquid interface and leave hydrophilic mineral particles in the ore slurry, thereby achieving selective flotation separation. Common collectors in the flotation separation of galena and sphalerite include xanthate, dithiophosphate and dithiocarbamate. Xanthate collectors such as ethyl xanthate and butyl xanthate have strong collection ability but poor selectivity. # Compared with xanthate collectors, dithiophosphate collectors and dithiocarbamate collectors such as black medicine and aniline black medicine have better selectivity, but they need high alkaline conditions to achieve good separation of galena and sphalerite. This not only increases the environmental risk of the mine, but also reduces the flotation recovery rate of associated gold or silver in lead-zinc sulfide ores. Therefore, it is necessary to develop highly selective collectors to achieve lime-free and low-dose inhibitor flotation separation of lead-zinc sulfide ores. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a combined collector for flotation separation of lead-zinc sulfide ores. The combined collector of the present invention comprises a pyridine derivative and an ethyl xanthate. The combined collector has a high selectivity for galena, so as to achieve efficient separation of galena and sphalerite.

[0005] The combined collector of the present invention is used as a collector of galena for flotation separation of galena and sphalerite. The combined collector comprises a pyridine derivative and an ethyl xanthate, wherein the pyridine derivative is one of 2-pyridinecarboxylic acid, 6-methyl-2-pyridinecarboxylic acid, 2-pyridinecarboxylic acid methyl ester and 2,6-pyridinedicarboxylic acid, and the mass ratio of the pyridine derivative to the ethyl xanthate is (150-200):(10-15).

[0006] The present invention also provides an application of the combined collector in the flotation separation of lead-zinc sulfide ores, and the specific steps are as follows:

[0007] (1) The raw ore is crushed and ground to separate the monomers between the minerals and then slurry is prepared.

[0008] (2) adding a combined depressant, a combined collector and a frother to the slurry in sequence to perform lead flotation operations to obtain lead concentrate and lead tailings;

[0009] (3) Adding an activator, a collector and a frother to the lead tailings in sequence to carry out zinc flotation operations to obtain zinc concentrate and tailings.

[0010] In the step (1) of the present invention, the ore is ground to a particle fineness of -0.074 mm, accounting for 78% to 82%.

[0011] The lead flotation operation in step (2) includes one roughing selection, two scavenging selections, and two concentrating selections. The zinc flotation operation in step (3) includes one roughing selection, two scavenging selections, and two concentrating selections.

[0012] In step (2), the combined inhibitor is composed of sodium sulfite and zinc sulfate, the addition ratio is 3:1, and the foaming agent is 2# oil.

[0013] In step (2), the dosage of the combined inhibitor sodium sulfite in the roughing is 1200-1500 g / t, the dosage of zinc sulfate is 400-500 g / t, the dosage of the combined collector pyridine derivative is 150-200 g / t, the dosage of ethyl xanthate is 10-15 g / t, and the dosage of 2# oil is 25-30 g / t; in the selection I, the dosage of the combined inhibitor sodium sulfite is 600-750 g / t, the dosage of zinc sulfate is 200-250 g / t, and the selection II is blank flotation; in the scavenging I, the dosage of pyridine derivative is 75-100 g / t, the dosage of ethyl xanthate is 5-7 g / t, and the dosage of 2# oil is 10-15 g / t, and the scavenging II is blank flotation;

[0014] In step (3), the activator is copper sulfate, the collector is butyl xanthate, and the frother is 2# oil, wherein the amount of copper sulfate in the roughing is 150-200 g / t, the amount of butyl xanthate is 200-250 g / t, and the amount of 2# oil is 20-25 g / t, and the selection I and selection II are blank flotation; the amount of copper sulfate in the scavenging selection I is 75-100 g / t, the amount of butyl xanthate is 100-150 g / t, and the amount of 2# oil is 10-15 g / t, and the amount of copper sulfate in the scavenging selection II is 20-50 g / t, the amount of butyl xanthate is 25-50 g / t, and the amount of 2# oil is 5-10 g / t.

[0015] In step (2) and step (3) of the present invention, the reagent is configured as a 1% mass concentration aqueous solution for addition, each roughing operation takes 5-6 minutes, each sweeping operation takes 4-5 minutes, and each fine selection operation takes 5-6 minutes.

[0016] No. 2 oil is added according to the weight required for the actual ore volume.

[0017] Principle of the present invention: The combined collector of the present invention includes pyridine derivatives and ethyl xanthate. The present invention mainly utilizes pyridine organic matter and ethyl xanthate to produce a synergistic effect and improve the overall capture performance. Pyridine derivatives contain two electron donors, O atoms and N atoms, and can form a stable five-membered chelate ring with the Pb metal on the surface of galena in space (as shown below). The test results show that pyridine derivatives have good selectivity for galena, but the relative capture ability is relatively weak, and galena cannot be well recovered by a single pyridine derivative. Therefore, a small amount of ethyl yellow is selected to enhance the activity of galena in advance, and galena is effectively recovered in combination with pyridine derivatives, thereby improving the overall lead recovery rate.

[0018]

[0019] Schematic diagram of the chelation of Pb with 2-pyridinecarboxylic acid, 6-methyl-2-pyridinecarboxylic acid, 2-pyridinecarboxylic acid methyl ester and 2,6-pyridinedicarboxylic acid among pyridine derivatives.

[0020] Beneficial effects of the present invention:

[0021] (1) The pyridine derivative in the combined collector of galena of the present invention has strong selectivity, and can significantly improve the separation of galena from sphalerite and gangue in the lead-zinc sulfide ore by cooperating with ethyl xanthate, thereby increasing the grade of lead concentrate and the recovery rate of lead.

[0022] (2) Compared with the large-scale use of sphalerite inhibitors, the combined collector of galena used in the present invention not only reduces the amount of sphalerite inhibitors, but also reduces the amount of sphalerite activators used in subsequent flotation, thereby saving reagent costs.

[0023] (3) The combined collector used in the present invention can achieve good lead-zinc ore separation effect at a lower pH value, which not only reduces the environmental risk of the mine, but also improves the flotation recovery rate of associated gold and silver precious metals in the sulfide lead-zinc ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The process flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0025] Example 1: This example 1 is a flotation separation test study on a lead-zinc sulfide ore in Inner Mongolia. The raw ore contains 2.13-2.18% Pb and 2.87-2.91% Zn. The lead in the ore mainly exists in the form of galena, the zinc mainly exists in the form of sphalerite, and the gangue mineral is mainly quartz.

[0026] Example 1-1 uses a combination of inhibitors 2-pyridine carboxylic acid and ethyl xanthate as a galena collector for lead and zinc separation. Figure 1As shown, the specific steps are as follows:

[0027] (1) crushing and grinding the lead-zinc sulfide ore to obtain a pulp to be floated;

[0028] (2) adding a combined inhibitor of sodium sulfite and zinc sulfate, a combined collector of 2-pyridinecarboxylic acid and ethyl xanthate, and a frother 2# oil to the ore pulp to be floated in step (1) in sequence to carry out lead roughing operation, the roughing time is 7 minutes, and a lead rough concentrate and a lead rough tailing are obtained; wherein the amount of sodium sulfite used is 1200 g / t, the amount of zinc sulfate used is 400 g / t, the amount of 2-pyridinecarboxylic acid used is 150 g / t, the amount of ethyl xanthate used is 10 g / t, and the amount of 2# oil used is 25 g / t;

[0029] (3) adding a combined inhibitor of sodium sulfite and zinc sulfate to the lead rough concentrate in step (2) to carry out lead concentration I, wherein the amount of sodium sulfite used is 600 g / t and the amount of zinc sulfate used is 200 g / t; the lead concentration I concentrate is subjected to a blank concentration again to obtain lead concentration II, thereby obtaining a final lead concentrate; each concentration operation lasts for 6 minutes, wherein the middlings of lead concentrations I and II are respectively returned to the lead rougher concentration and lead concentration I, thereby forming a closed loop;

[0030] (4) adding a combined collector of 2-pyridinecarboxylic acid and ethyl xanthate and a foaming agent 2# oil to the lead rough tailings in step (2) to carry out lead scavenging I, wherein the amount of 2-pyridinecarboxylic acid is 75 g / t, the amount of ethyl xanthate is 5 g / t, and the amount of 2# oil is 10 g / t. The tailings of lead scavenging I are subjected to another blank scavenging, namely lead scavenging II, and each scavenging operation time is 5 minutes, wherein the middlings of lead scavenging I and II are respectively returned to the lead roughing and lead scavenging I, forming a closed loop;

[0031] (5) adding activator copper sulfate, collector butyl xanthate and frother 2# oil to the lead scavenging II tailings in step (4) in sequence to carry out zinc roughing operation, the roughing time is 7 minutes, and zinc rough concentrate and zinc rough tailings are obtained, wherein the amount of copper sulfate is 150 g / t, the amount of butyl xanthate is 200 g / t, and the amount of 2# oil is 20 g / t;

[0032] (6) The zinc rough concentrate in step (5) is subjected to two blank concentrations, each concentration operation time is 6 minutes, to obtain a final zinc concentrate, wherein the middlings of zinc concentration I and II are returned to the zinc rougher and zinc concentration I, respectively, to form a closed loop;

[0033] (7) To the zinc rough tailings in step (5), activator copper sulfate, collector butyl xanthate and frother 2# oil were added in sequence to carry out zinc scavenging I, wherein the amount of copper sulfate, the amount of butyl xanthate and the amount of 2# oil were 75 g / t, 100 g / t and 10 g / t, and to the zinc scavenging I tailings, activator copper sulfate, collector butyl xanthate and frother 2# oil were added to carry out zinc scavenging II, wherein the amount of copper sulfate, the amount of butyl xanthate and the amount of 2# oil were 20 g / t, 25 g / t and 5 g / t, and each scavenging operation time was 5 minutes, wherein the middlings of zinc scavenging I and II were returned to zinc roughing and zinc scavenging I respectively, forming a closed loop, and the product indicators are shown in Table 1.

[0034] Example 1-2 uses 6-methyl-2-pyridinecarboxylic acid and ethyl xanthate as galena combined collectors for lead and zinc separation, and other process conditions remain unchanged. The product indicators are shown in Table 1.

[0035] In Example 1-3, methyl 2-picolinate and ethyl xanthate were used as galena combined collectors for lead and zinc separation. Other process conditions remained unchanged. The product indicators are shown in Table 1.

[0036] In Example 1-4, 2,6-pyridinedicarboxylic acid and ethyl xanthate were used as galena combined collectors for lead and zinc separation. Other process conditions remained unchanged. The product indicators are shown in Table 1.

[0037] Comparative Examples 1-5 used a single ethyl xanthate as a galena collector for lead-zinc separation. The dosage of ethyl xanthate in lead roughing and lead scavenging was 160 g / t and 80 g / t, respectively, and other process conditions remained unchanged. The product indicators are shown in Table 1.

[0038] Comparative Examples 1-6 used single 2-picolinic acid as galena collector for lead-zinc separation. The dosage of 2-picolinic acid in lead roughing and lead scavenging was 150 g / t and 75 g / t, respectively, and other process conditions remained unchanged. The product indicators are shown in Table 1.

[0039] Table 1 Flotation separation results of Example 1

[0040]

[0041]

[0042] It can be seen from Table 1 that under the condition of the lowest dosage of reagents, the combined collector increased the lead grade in the lead concentrate by about 7 percentage points, reduced the zinc grade by about 25 percentage points, and increased the lead recovery rate by about 3 percentage points compared with the single ethyl xanthate, indicating that the selectivity of the combined collector for galena is greater than that of ethyl xanthate. Compared with the single pyridine derivative, although the lead grade in the lead concentrate of the combined collector remained almost unchanged, the lead recovery rate was relatively low, down 19 percentage points, indicating that the addition of ethyl xanthate can improve the lead recovery rate.

[0043] Example 2: This example 2 is a flotation separation test study on a lead-zinc sulfide ore in Yunnan. The raw ore contains 3.05-3.15% Pb and 4.40-4.50% Zn. The lead in the ore mainly exists in the form of galena, the zinc mainly exists in the form of sphalerite, and the gangue minerals mainly include quartz, dolomite, etc.

[0044] Example 2-1 uses a combination of inhibitors 2-pyridine carboxylic acid and ethyl xanthate as a galena collector for lead and zinc separation. Figure 1 As shown, the specific steps are as follows:

[0045] (1) crushing and grinding the lead-zinc sulfide ore to obtain a pulp to be floated;

[0046] (2) adding a combined inhibitor of sodium sulfite and zinc sulfate, a combined collector of 2-pyridinecarboxylic acid and ethyl xanthate, and a frother 2# oil to the ore pulp to be floated in step (1) in sequence to carry out lead roughing operation, the roughing time is 7 minutes, and a lead rough concentrate and a lead rough tailing are obtained, wherein the amount of sodium sulfite is 1500 g / t, the amount of zinc sulfate is 500 g / t, the amount of 2-pyridinecarboxylic acid is 200 g / t, the amount of ethyl xanthate is 15 g / t, and the amount of 2# oil is 30 g / t;

[0047] (3) adding a combined inhibitor of sodium sulfite and zinc sulfate to the lead rough concentrate in step (2) to carry out lead concentration I, wherein the amount of sodium sulfite used is 750 g / t and the amount of zinc sulfate used is 250 g / t, and the lead concentration I concentrate is subjected to a blank concentration again to obtain lead concentration II, thereby obtaining a final lead concentrate, wherein each concentration operation time is 6 minutes, wherein the middlings of lead concentration I and II are respectively returned to the lead rougher concentration and lead concentration I, thereby forming a closed loop;

[0048] (4) adding a combined collector of 2-pyridinecarboxylic acid and ethyl xanthate and a frother 2# oil to the lead rough tailings in step (2) to carry out lead scavenging I, wherein the amount of 2-pyridinecarboxylic acid is 100 g / t, the amount of ethyl xanthate is 7 g / t, and the amount of 2# oil is 15 g / t. The lead scavenging I tailings are subjected to another blank scavenging, i.e., lead scavenging II, and each scavenging operation time is 5 minutes, wherein the middlings of lead scavenging I and II are respectively returned to the lead roughing and lead scavenging I, forming a closed loop;

[0049] (5) Adding activator copper sulfate, collector butyl xanthate and frother 2# oil to the lead scavenging II tailings in step (4) in sequence to carry out zinc roughing operation, the roughing time is 7 minutes, and zinc rough concentrate and zinc rough tailings are obtained. The amount of copper sulfate used is 200g / t, the amount of butyl xanthate used is 250g / t, and the amount of 2# oil used is 25g / t;

[0050] (6) The zinc rough concentrate in step (5) is subjected to two blank concentrations, each concentration operation time is 6 minutes, to obtain a final zinc concentrate, wherein the middlings of zinc concentration I and II are returned to the zinc rougher and zinc concentration I, respectively, to form a closed loop.

[0051] (7) To the zinc rough tailings in step (5), activator copper sulfate, collector butyl xanthate and frother 2# oil were added in sequence to carry out zinc scavenging I, wherein the amount of copper sulfate was 100 g / t, the amount of butyl xanthate was 150 g / t, and the amount of 2# oil was 15 g / t. To the zinc scavenging I tailings, activator copper sulfate, collector butyl xanthate and frother 2# oil were added to carry out zinc scavenging II, wherein the amount of copper sulfate was 50 g / t, the amount of butyl xanthate was 50 g / t, and the amount of 2# oil was 10 g / t. Each scavenging operation time was 5 minutes. The middlings of zinc scavenging I and II were returned to zinc roughing and zinc scavenging I, respectively, to form a closed loop. The product indicators are shown in Table 2.

[0052] Example 2-2 uses 6-methyl-2-pyridinecarboxylic acid and ethyl xanthate as galena combined collectors for lead and zinc separation, and other process conditions remain unchanged. The product indicators are shown in Table 2.

[0053] Example 2-3 uses methyl 2-picolinate and ethyl xanthate as galena combined collectors for lead and zinc separation, and other process conditions remain unchanged. The product indicators are shown in Table 2.

[0054] Example 2-4 uses 2,6-pyridinedicarboxylic acid and ethyl xanthate as galena combined collectors for lead and zinc separation, and other process conditions remain unchanged. The product indicators are shown in Table 2.

[0055] Comparative Example 2-5 uses a single ethyl xanthate as a galena collector for lead-zinc separation. The dosage of ethyl xanthate in lead roughing and lead scavenging I is 215 g / t and 107 g / t, and other process conditions remain unchanged. The product indicators are shown in Table 2.

[0056] Comparative Example 2-6 uses a single 2-picolinic acid as a galena collector for lead-zinc separation. The dosage of 2-picolinic acid in lead roughing and lead scavenging is 200 g / t and 100 g / t, respectively, and other process conditions remain unchanged. The product indicators are shown in Table 2.

[0057] Table 2 Flotation separation results of Example 2

[0058]

[0059]

[0060] It can be seen from Table 2 that under the condition of the lowest dosage of reagents, the combined collector increased the lead grade in the lead concentrate by about 12 percentage points, reduced the zinc grade by about 13 percentage points, and increased the lead recovery rate by about 12 percentage points compared with the single ethyl xanthate, indicating that the selectivity of the combined collector for galena is greater than that of ethyl xanthate. Compared with the single pyridine derivative, although the lead grade in the lead concentrate of the combined collector remained almost unchanged, the lead recovery rate was relatively low, down 20 percentage points, indicating that the addition of ethyl xanthate can improve the lead recovery rate.

[0061] Example 3: This example 3 is a flotation separation test study on a lead-zinc sulfide ore in Yunnan. The raw ore contains 2.90-2.95% Pb and 2.77-2.82% Zn. The lead in the ore mainly exists in the form of galena, the zinc mainly exists in the form of sphalerite, and the gangue mineral is mainly quartz.

[0062] Example 3-1 uses a combination of inhibitors 2-pyridine carboxylic acid and ethyl xanthate as a galena collector for lead and zinc separation. Figure 1 As shown, the specific steps are as follows:

[0063] (1) crushing and grinding the lead-zinc sulfide ore to obtain a pulp to be floated;

[0064] (2) adding a combined inhibitor of sodium sulfite and zinc sulfate, a combined collector of 2-picolinic acid and ethyl xanthate, and a frother 2# oil to the ore pulp to be floated in step (1) in sequence to carry out lead roughing operation, the roughing time is 7 minutes, and a lead rough concentrate and a lead rough tailing are obtained; wherein the amount of sodium sulfite used is 1350 g / t, the amount of zinc sulfate used is 450 g / t, the amount of 2-picolinic acid used is 175 g / t, the amount of ethyl xanthate used is 12 g / t, and the amount of 2# oil used is 22 g / t;

[0065] (3) adding a combined inhibitor of sodium sulfite and zinc sulfate to the lead rough concentrate in step (2) to carry out lead concentration I, wherein the amount of sodium sulfite used is 675 g / t and the amount of zinc sulfate used is 225 g / t; the lead concentration I concentrate is subjected to a blank concentration again to obtain lead concentration II, thereby obtaining a final lead concentrate; each concentration operation lasts for 6 minutes, wherein the middlings of lead concentrations I and II are respectively returned to the lead rougher concentration and lead concentration I, thereby forming a closed loop;

[0066] (4) adding a combined collector of 2-pyridinecarboxylic acid and ethyl xanthate and a foaming agent 2# oil to the lead rough tailings in step (2) to carry out lead scavenging I, wherein the amount of 2-pyridinecarboxylic acid used is 87 g / t, the amount of ethyl xanthate used is 6 g / t, and the amount of 2# oil used is 12 g / t. The lead scavenging I tailings are subjected to another blank scavenging, i.e., lead scavenging II, and each scavenging operation time is 5 minutes, wherein the middlings of lead scavenging I and II are respectively returned to the lead roughing and lead scavenging I, forming a closed loop;

[0067] (5) adding activator copper sulfate, collector butyl xanthate and frother 2# oil to the lead scavenging II tailings in step (4) in sequence to carry out zinc roughing operation, the roughing time is 7 minutes, and zinc rough concentrate and zinc rough tailings are obtained, wherein the amount of copper sulfate is 175 g / t, the amount of butyl xanthate is 225 g / t, and the amount of 2# oil is 23 g / t;

[0068] (6) The zinc rough concentrate in step (5) is subjected to two blank concentrations, each concentration operation time is 6 minutes, to obtain a final zinc concentrate, wherein the middlings of zinc concentration I and II are returned to the zinc rougher and zinc concentration I, respectively, to form a closed loop;

[0069] (7) To the zinc rough tailings in step (5), activator copper sulfate, collector butyl xanthate and frother 2# oil were added in sequence to carry out zinc scavenging I, wherein the amount of copper sulfate, the amount of butyl xanthate and the amount of 2# oil were 87 g / t, 125 g / t and 13 g / t, and to the zinc scavenging I tailings, activator copper sulfate, collector butyl xanthate and frother 2# oil were added to carry out zinc scavenging II, wherein the amount of copper sulfate, the amount of butyl xanthate and the amount of 2# oil were 35 g / t, 38 g / t and 8 g / t, and each scavenging operation time was 5 minutes, wherein the middlings of zinc scavenging I and II were returned to zinc roughing and zinc scavenging I respectively, forming a closed loop, and the product indicators are shown in Table 3.

[0070] Example 3-2 uses 6-methyl-2-pyridinecarboxylic acid and ethyl xanthate as galena combined collectors for lead and zinc separation, and other process conditions remain unchanged. The product indicators are shown in Table 3.

[0071] Example 3-3 uses methyl 2-picolinate and ethyl xanthate as galena combined collectors for lead and zinc separation, and other process conditions remain unchanged. The product indicators are shown in Table 3.

[0072] Example 3-4 uses 2,6-pyridinedicarboxylic acid and ethyl xanthate as galena combined collectors for lead and zinc separation, and other process conditions remain unchanged. The product indicators are shown in Table 3.

[0073] Table 3 Flotation separation results of Example 3

[0074]

[0075]

[0076] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A combined collector for flotation separation of lead-zinc sulfide ores, characterized in that: The combined collector comprises a pyridine derivative and an ethyl xanthate, wherein the pyridine derivative is one of 2-pyridinecarboxylic acid, 6-methyl-2-pyridinecarboxylic acid, 2-pyridinecarboxylic acid methyl ester and 2,6-pyridinedicarboxylic acid.

2. The combined collector for flotation separation of lead-zinc sulfide ores according to claim 1, characterized in that: The combined collector is used as a collector for galena for flotation separation of galena and sphalerite.

3. The combined collector for flotation separation of lead-zinc sulfide ores according to claim 1, characterized in that: The mass ratio of pyridine derivatives to ethyl xanthate is (150-200):(10-15).

4. An application of the combined collector for flotation separation of lead-zinc sulfide ores as claimed in claims 1 to 3, characterized in that , the specific steps are as follows: (1) Crushing and grinding the raw ore until the monomers between the minerals are dissociated and then slurry is prepared; (2) adding a combined depressant, a combined collector and a frother to the slurry in sequence to perform lead flotation operations to obtain lead concentrate and lead tailings; (3) Adding an activator, a collector and a frother to the lead tailings in sequence to carry out zinc flotation operations to obtain zinc concentrate and tailings.

5. The use of the combined collector for flotation separation of lead-zinc sulfide ores according to claim 4, characterized in that: Step (1) grinding the ore to a particle fineness of -0.074 mm accounts for 78% to 82%.

6. The use of the combined collector for flotation separation of lead-zinc sulfide ores according to claim 4, characterized in that: The lead flotation operation in step (2) includes one roughing selection, two scavenging selections, and two concentrating selections. The zinc flotation operation in step (3) includes one roughing selection, two scavenging selections, and two concentrating selections.

7. The use of the combined collector for flotation separation of lead-zinc sulfide ores according to claim 4, characterized in that: In step (2), the combined inhibitor is composed of sodium sulfite and zinc sulfate, the addition ratio is 3:1, and the foaming agent is 2# oil.

8. The use of the combined depressant for flotation separation of lead-zinc sulfide ores according to claim 4, characterized in that: In step (2), the amount of sodium sulfite as the combined inhibitor in the roughing selection is 1200-1500 g / t, the amount of zinc sulfate is 400-500 g / t, the amount of pyridine derivatives as the combined collector is 150-200 g / t, the amount of ethyl xanthate is 10-15 g / t, and the amount of 2# oil is 25-30 g / t; in the selection I, the amount of sodium sulfite as the combined inhibitor is 600-750 g / t, the amount of zinc sulfate is 200-250 g / t, and the selection II is blank flotation; in the scavenging selection I, the amount of pyridine derivatives in the combined collector is 75-100 g / t, the amount of ethyl xanthate is 5-7 g / t, and the amount of 2# oil is 10-15 g / t, and the scavenging selection II is blank flotation.

9. The use of the combined depressant for flotation separation of lead-zinc sulfide ores according to claim 4, characterized in that: In step (3), the activator is copper sulfate, the collector is butyl xanthate, and the frother is 2# oil, wherein the amount of copper sulfate in the roughing is 150-200 g / t, the amount of butyl xanthate is 200-250 g / t, and the amount of 2# oil is 20-25 g / t, and the selection I and selection II are blank flotation; the amount of copper sulfate in the scavenging selection I is 75-100 g / t, the amount of butyl xanthate is 100-150 g / t, and the amount of 2# oil is 10-15 g / t, and the amount of copper sulfate in the scavenging selection II is 20-50 g / t, the amount of butyl xanthate is 25-50 g / t, and the amount of 2# oil is 5-10 g / t.

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