Lead zinc ore flotation method for strengthening recovery of micro-fine particle galena

Abstract

The lead-zinc ore flotation method comprises the following steps that raw ore is ground to be fine, after a sulfur inhibitor, a zinc inhibitor, a lead collecting agent, a lead flocculating agent and a foaming agent are sequentially added, lead concentrate is obtained through flotation, after the sulfur inhibitor, a zinc activating agent, the zinc collecting agent and the foaming agent are sequentially added into lead flotation tailings, the lead concentrate is obtained through flotation; and zinc concentrate is obtained through flotation. According to the method, the technological process is simple and convenient, industrial production is easy, the adaptability to ore grinding products containing the micro-fine-particle galena is high, the flotation recovery rate of the micro-fine-particle galena can be increased, the quality of zinc concentrate is guaranteed, and better lead-zinc flotation indexes are obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing engineering, and in particular relates to a lead-zinc ore flotation method for strengthening the recovery of micro-fine galena. Background Art

[0002] Lead metal has excellent properties such as low melting point, high density and high plasticity, and is widely used in the fields of automobiles, electronics, batteries, and construction. Lead sulfide minerals represented by galena are the main source of lead metal recovery. With the vigorous development of high-grade and easily recoverable lead sulfide resources, the current lead sulfide resources have shown the characteristics of "poor, fine and mixed", and the ore types and compositions are complex. Lead sulfide minerals such as galena are finely embedded, and the fineness of the grinding product needs to be increased to obtain monomer-dissociated galena particles. At the same time, galena is brittle and prone to over-grinding during the grinding process, resulting in the production of a large amount of fine galena. Due to the small particle size and low momentum of fine galena, it is difficult for its surface to break through the hydration film and attach to the bubble surface and float after being adsorbed by the collector. Therefore, this type of fine galena cannot be efficiently recovered. Develop efficient flotation recovery technology for fine galena to improve the utilization rate of lead resources. Summary of the invention

[0003] The object of the present invention is to provide a lead-zinc ore flotation method for enhancing the recovery of fine-grained galena, thereby solving the problem of low flotation recovery rate of fine-grained galena in lead-zinc sulfide ores.

[0004] The present invention provides a lead-zinc ore flotation method for enhancing the recovery of fine-grained galena, comprising the following steps:

[0005] S1. Crushing and grinding the raw ore to obtain grinding products;

[0006] S2. The ore grinding product obtained in step S1 is subjected to lead roughing to obtain lead roughing concentrate and lead roughing tailings;

[0007] S3. The lead rougher concentrate is subjected to three lead concentrations to obtain a lead concentrate;

[0008] S4. The lead roughing tailings are subjected to two lead scavenging selections, zinc roughing selections, three zinc cleaning selections and two zinc scavenging selections to obtain zinc concentrate and tailings.

[0009] Furthermore, in step S1, the -0.074 mm particle size accounts for 80% to 90% of the ground product.

[0010] In the present invention, the measurement unit of reagent addition, g / t, is based on the mass of the original ore.

[0011] Further, in step S2, the reagent system for lead roughing is: adding sulfur inhibitor, zinc inhibitor, lead collector, lead flocculant and foaming agent in sequence; the sulfur inhibitor is lime, and the addition amount is 1000-5000 g / t; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the addition amount of zinc inhibitor is specifically: the addition amount of zinc sulfate is 600-2100 g / t, and the addition amount of sodium pyrosulfite is 200-700 g / t;

[0012] The lead collector is a combination of butyl ammonium black powder and alkyl thiocarbamate, wherein the mass ratio of butyl ammonium black powder to alkyl thiocarbamate is (7-27):3, and the added amount of the lead collector is 50-100 g / t; the alkyl thiocarbamate is one of dibutyl dithiocarbamate and dibenzyl dithiocarbamate; the lead flocculant is polyvinyl ether, and the added amount is 10-30 g / t; the foaming agent is at least one of pine oil and methyl isobutyl carbinol, and the added amount is 10-30 g / t.

[0013] Furthermore, in step S3, the three lead concentrations are specifically:

[0014] The lead roughing concentrate is added with a sulfur inhibitor and a zinc inhibitor for the first lead concentration to obtain a lead concentrate 1 and a lead concentrate tailing 1; the sulfur inhibitor is lime, and the addition amount is one-fifth of that of the lead roughing concentrate; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the addition amount of the zinc inhibitor is half of that of the lead roughing concentrate;

[0015] The lead concentrate 1 is added with a sulfur inhibitor and a zinc inhibitor for a second lead concentration to obtain a lead concentrate 2 and a lead concentrate tailing 2; the lead concentrate tailing 2 is returned to the first lead concentration; the sulfur inhibitor is lime, and the amount added is half of that in the first lead concentration; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the amount of the zinc inhibitor added is half of that in the first lead concentration;

[0016] The lead concentrate 1 is subjected to a third lead concentration without adding reagents to obtain lead concentrate and lead concentrate tailings 3; and the lead concentrate tailings 3 are returned to the second lead concentration.

[0017] Furthermore, in step S4, the lead scanning is specifically as follows:

[0018] The lead roughing tailings are added with a lead collector for the first lead scavenging to obtain a lead scavenging concentrate 1 and a lead scavenging tailing 1; the lead scavenging concentrate 1 and the lead concentrating tailing 1 are returned to the lead roughing; the lead collector is a combination of butylammonium black medicine and alkylthiocarbamate, wherein the mass ratio of butylammonium black medicine to alkylthiocarbamate is (7-27):3, and the amount of the lead collector added is half of that of the lead roughing;

[0019] The lead scavenging tailing 1 is added with a lead collector for a second lead scavenging to obtain a lead scavenging concentrate 2 and a lead scavenging tailing 2; the lead scavenging concentrate 2 is returned to the first lead scavenging. The lead collector is a combination of butylammonium black powder and alkylthiocarbamate, wherein the mass ratio of butylammonium black powder to alkylthiocarbamate is (7-27):3, and the amount of the lead collector added is half of that of the first lead scavenging;

[0020] The zinc roughing is specifically as follows:

[0021] A sulfur inhibitor, a zinc activator, a zinc collector and a foaming agent are sequentially added to the lead scavenging tailings 2 for zinc roughing to obtain a zinc roughing concentrate and a zinc roughing tailings; the sulfur inhibitor is lime, and the addition amount is 500-2000 g / t; the zinc activator is copper sulfate, and the addition amount is 200-400 g / t; the zinc collector is butyl xanthate, and the addition amount is 50-120 g / t; the foaming agent is at least one of pine oil and methyl isobutyl carbinol, and the addition amount is 10-30 g / t.

[0022] The three zinc concentrations are specifically:

[0023] The zinc rougher concentrate is added with a sulfur inhibitor for the first zinc concentration to obtain a zinc concentrate 1 and a zinc concentrate tailing 1; the sulfur inhibitor is lime, and the amount added is half of that of the zinc rougher;

[0024] The zinc concentrate 1 is added with a sulfur inhibitor for a second zinc concentration to obtain a zinc concentrate 2 and a zinc tailing 2; the zinc tailing 2 is returned to the first zinc concentration; the sulfur inhibitor is lime, and the amount added is half of that of the first zinc concentration;

[0025] The zinc concentrate 2 is subjected to a third zinc concentration without adding reagents to obtain zinc concentrate and zinc concentrate tailings 3; the zinc concentrate tailings 3 are returned to the second zinc concentration.

[0026] The two zinc sweeps are specifically:

[0027] The zinc roughing tailings are added with a zinc collector for the first zinc scavenging to obtain a zinc scavenging concentrate 1 and a zinc scavenging tailing 1; the zinc scavenging concentrate 1 and the zinc concentrating tailing 1 are combined and returned to the zinc roughing; the zinc collector is butyl xanthate, and the addition amount is half of that of the zinc roughing;

[0028] The zinc scavenging tailing 1 is added with a zinc collector for a second zinc scavenging to obtain a zinc scavenging concentrate 2 and tailings; the zinc scavenging concentrate 2 is returned to the first zinc scavenging. The zinc collector is butyl xanthate, and the addition amount is half of the first zinc scavenging.

[0029] Principle of the present invention:

[0030] Adding lead collector, butylamine black medicine and alkyl thiocarbamate in the slurry is beneficial to the synergistic adsorption on the surface of fine galena, which improves the hydrophobicity of the surface of fine galena. After adding lead flocculant polyethylene ether, the collector adsorbed on the surface of fine galena and the flocculant interact with each other due to hydrophobic force. Therefore, multiple galena particles are aggregated on the flocculant molecular chain, which effectively increases the apparent particle size of fine galena. At this time, the flocculated particles have a large momentum and can break through the hydration film on the surface of the bubble and attach to achieve the floating of fine galena.

[0031] Beneficial effects of the present invention:

[0032] (1) The lead-zinc ore flotation method provided by the present invention has strong adaptability to grinding products containing fine-grained galena, can enhance the flotation recovery of fine-grained galena, improve the utilization rate of lead resources, reduce the impact on the quality of zinc concentrate, and help achieve efficient flotation separation and recovery of lead and zinc resources;

[0033] The process flow of the invention is simple and convenient, and is easy for industrial production. It has strong adaptability to grinding products containing fine galena, can improve the flotation recovery rate of fine galena, ensure the quality of zinc concentrate, and obtain better lead-zinc flotation indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, application method and beneficial effects of the present invention clearer, the embodiments of the present invention will be described in detail below to facilitate the understanding of technicians.

[0036] Example 1

[0037] The Pb grade of a lead-zinc sulfide ore is 5.14% and the Zn grade is 15.23%. The specific flotation process is as follows: Figure 1 As shown, the following steps are included:

[0038] 1) The raw ore is crushed and ground, and the -0.074 mm particle size accounts for 80% of the ground product;

[0039] 2) The ground ore product obtained in step 1) is sequentially added with 5000 g / t of lime, 2100 g / t of zinc sulfate, 700 g / t of sodium sulfite, 100 g / t of lead collector (butylamine black medicine and dibutyl dithiocarbamate according to a mass ratio of 7:3), 30 g / t of lead flocculant (polyethylene ether), and 30 g / t of pine oil to carry out lead roughing to obtain lead roughing concentrate and lead roughing tailings;

[0040] 3) adding a sulfur inhibitor and a zinc inhibitor to the lead rougher concentrate to carry out the first lead concentration to obtain a lead concentrate 1 and a lead concentrate tailing 1; the sulfur inhibitor is lime, and the addition amount is 1000 g / t; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the addition amount of the zinc inhibitor is: 1050 g / t of zinc sulfate and 350 g / t of sodium sulfite;

[0041] The lead concentrate 1 is added with a sulfur inhibitor and a zinc inhibitor for a second lead concentration to obtain a lead concentrate 2 and a lead tailing 2; the lead tailing 2 is returned to the first lead concentration; the sulfur inhibitor is lime, and the addition amount is 500g / t; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the addition amount of the zinc inhibitor is: zinc sulfate 525g / t, sodium sulfite 175g / t;

[0042] The lead concentrate 1 is subjected to a third lead concentration without adding reagents to obtain a lead concentrate and a lead concentrate tailing 3; the lead concentrate tailing 3 is returned to the second lead concentration;

[0043] 4) adding a lead collector to the lead roughing tailings for the first lead scavenging to obtain a lead scavenging concentrate 1 and a lead scavenging tailing 1; the lead scavenging concentrate 1 and the lead concentrated tailing 1 are returned to the lead roughing; the lead collector is a combination of butylammonium black medicine and alkylthiocarbamate, wherein the mass ratio of butylammonium black medicine to alkylthiocarbamate is 7:3, and the amount of the lead collector added is 50 g / t;

[0044] The lead scavenging tailing 1 is added with a lead collector for a second lead scavenging to obtain a lead scavenging concentrate 2 and a lead scavenging tailing 2; the lead scavenging concentrate 2 is returned to the first lead scavenging. The lead collector is a combination of butylammonium black medicine and alkylthiocarbamate, wherein the mass ratio of butylammonium black medicine to alkylthiocarbamate is 7:3, and the amount of the lead collector added is 25g / t;

[0045] The lead scavenging tailing 2 is sequentially added with a sulfur inhibitor, a zinc activator, a zinc collector and a foaming agent for zinc roughing to obtain a zinc roughing concentrate and a zinc roughing tailing; the sulfur inhibitor is lime, and the addition amount is 2000g / t; the zinc activator is copper sulfate, and the addition amount is 400g / t; the zinc collector is butyl xanthate, and the addition amount is 120g / t; the foaming agent is pine oil, and the addition amount is 30g / t;

[0046] The zinc rougher concentrate is added with a sulfur inhibitor for the first zinc concentration to obtain a zinc concentrate 1 and a zinc concentrate tailing 1; the sulfur inhibitor is lime, and the addition amount is 1000g / t;

[0047] The zinc concentrate 1 is added with a sulfur inhibitor for a second zinc concentration to obtain a zinc concentrate 2 and a zinc tailing 2; the zinc tailing 2 is returned to the first zinc concentration; the sulfur inhibitor is lime, and the addition amount is 500g / t;

[0048] The zinc concentrate 2 is subjected to a third zinc concentration without adding reagents to obtain zinc concentrate and zinc concentrate tailings 3; the zinc concentrate tailings 3 are returned to the second zinc concentration;

[0049] The zinc roughing tailings are added with a zinc collector for the first zinc scavenging to obtain a zinc scavenging concentrate 1 and a zinc scavenging tailing 1; the zinc scavenging concentrate 1 and the zinc concentrating tailing 1 are combined and returned to the zinc roughing; the zinc collector is butyl xanthate, and the addition amount is 60g / t;

[0050] The zinc scavenging tailing 1 is added with a zinc collector for a second zinc scavenging to obtain a zinc scavenging concentrate 2 and tailings; the zinc scavenging concentrate 2 is returned to the first zinc scavenging. The zinc collector is butyl xanthate, and the addition amount is 30g / t; the final results are shown in Table 1.

[0051] Table 1 Flotation test results / %

[0052]

[0053] Comparative Example 1

[0054] The other conditions were the same as those in Example 1, except that no lead flocculant was added. The test results are shown in Table 2.

[0055] Table 2 Flotation test results / %

[0056]

[0057] Comparative Example 2

[0058] Other conditions are consistent with those in Example 1, except that the lead collector is only butylamine black medicine. The test results are shown in Table 3.

[0059] Table 3 Flotation test results / %

[0060]

[0061] Example 2

[0062] The Pb grade of a lead-zinc sulfide ore is 3.16% and the Zn grade is 7.88%. The specific flotation process includes the following steps:

[0063] 1) The raw ore is crushed and ground, and the -0.074mm particle size accounts for 90% of the ground product;

[0064] 2) The ground ore product obtained in step 1) is sequentially added with 1000 g / t of lime, 1500 g / t of zinc sulfate, 500 g / t of sodium sulfite, 70 g / t of lead collector (butylamine black medicine and dibutyl dithiocarbamate in a mass ratio of 9:1), 20 g / t of lead flocculant (polyethylene ether), and 20 g / t of methyl isobutyl carbinol to carry out lead roughing to obtain lead roughing concentrate and lead roughing tailings;

[0065] 3) adding a sulfur inhibitor and a zinc inhibitor to the lead rougher concentrate for the first lead concentration to obtain a lead concentrate 1 and a lead concentrate tailing 1; the sulfur inhibitor is lime, and the addition amount is 200 g / t; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the addition amounts of the zinc inhibitor are: 750 g / t zinc sulfate and 250 g / t sodium sulfite;

[0066] The lead concentrate 1 is added with a sulfur inhibitor and a zinc inhibitor for a second lead concentration to obtain a lead concentrate 2 and a lead tailing 2; the lead tailing 2 is returned to the first lead concentration; the sulfur inhibitor is lime, and the addition amount is 100g / t; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the addition amount of the zinc inhibitor is: 375g / t zinc sulfate and 125g / t sodium sulfite;

[0067] The lead concentrate 1 is subjected to a third lead concentration without adding reagents to obtain a lead concentrate and a lead concentrate tailing 3; the lead concentrate tailing 3 is returned to the second lead concentration;

[0068] 4) adding a lead collector to the lead roughing tailings for the first lead scavenging to obtain a lead scavenging concentrate 1 and a lead scavenging tailing 1; the lead scavenging concentrate 1 and the lead concentrated tailing 1 are returned to the lead roughing; the lead collector is a combination of butylammonium black medicine and alkylthiocarbamate, wherein the mass ratio of butylammonium black medicine to alkylthiocarbamate is 9:1, and the amount of the lead collector added is 35 g / t;

[0069] The lead scavenging tailing 1 is added with a lead collector for a second lead scavenging to obtain a lead scavenging concentrate 2 and a lead scavenging tailing 2; the lead scavenging concentrate 2 is returned to the first lead scavenging. The lead collector is a combination of butylammonium black powder and alkylthiocarbamate, wherein the mass ratio of butylammonium black powder to alkylthiocarbamate is 9:1, and the amount of the lead collector added is 17.5 g / t;

[0070] The lead scavenging tailing 2 is sequentially added with a sulfur inhibitor, a zinc activator, a zinc collector and a foaming agent to perform zinc roughing to obtain a zinc roughing concentrate and a zinc roughing tailing; the sulfur inhibitor is lime, and the addition amount is 500 g / t; the zinc activator is copper sulfate, and the addition amount is 300 g / t; the zinc collector is butyl xanthate, and the addition amount is 100 g / t; the foaming agent is methyl isobutyl carbinol, and the addition amount is 20 g / t;

[0071] The zinc rougher concentrate is added with a sulfur inhibitor for the first zinc concentration to obtain a zinc concentrate 1 and a zinc concentrate tailing 1; the sulfur inhibitor is lime, and the addition amount is 250g / t;

[0072] The zinc concentrate 1 is added with a sulfur inhibitor for a second zinc concentration to obtain a zinc concentrate 2 and a zinc tailing 2; the zinc tailing 2 is returned to the first zinc concentration; the sulfur inhibitor is lime, and the addition amount is 125g / t;

[0073] The zinc concentrate 2 is subjected to a third zinc concentration without adding reagents to obtain zinc concentrate and zinc concentrate tailings 3; the zinc concentrate tailings 3 are returned to the second zinc concentration;

[0074] The zinc roughing tailings are added with a zinc collector for the first zinc scavenging to obtain a zinc scavenging concentrate 1 and a zinc scavenging tailing 1; the zinc scavenging concentrate 1 and the zinc concentrating tailing 1 are combined and returned to the zinc roughing; the zinc collector is butyl xanthate, and the addition amount is 50g / t;

[0075] The zinc scavenging tailing 1 is added with a zinc collector for a second zinc scavenging to obtain a zinc scavenging concentrate 2 and tailings; the zinc scavenging concentrate 2 is returned to the first zinc scavenging. The zinc collector is butyl xanthate, and the addition amount is 25g / t; the test results are shown in Table 4.

[0076] Table 4 Flotation test results / %

[0077]

[0078] Comparative Example 3

[0079] The other conditions are consistent with those in Example 2, except that no lead flocculant is added. The test results are shown in Table 5.

[0080] Table 5 Flotation test results / %

[0081]

[0082] Comparative Example 4

[0083] The other conditions are consistent with those in Example 2, except that no lead flocculant is added. The test results are shown in Table 6.

[0084] Table 6 Flotation test results / %

[0085]

[0086] Example 3

[0087] The Pb grade of a lead-zinc sulfide ore is 2.03% and the Zn grade is 4.22%. The specific flotation process includes the following steps:

[0088] 1) The raw ore is crushed and ground, and the -0.074 mm particle size accounts for 85% of the ground product;

[0089] 2) The ground ore product obtained in step 1) is sequentially added with 3000 g / t of lime, 600 g / t of zinc sulfate, 200 g / t of sodium sulfite, 50 g / t of lead collector (butylamine black medicine and dibutyl dithiocarbamate in a mass ratio of 8:2), 10 g / t of lead flocculant (polyethylene ether), and 10 g / t of pine oil to perform lead roughing to obtain lead roughing concentrate and lead roughing tailings;

[0090] 3) adding a sulfur inhibitor and a zinc inhibitor to the lead rougher concentrate to carry out the first lead concentration, thereby obtaining a lead concentrate 1 and a lead concentrate tailing 1; the sulfur inhibitor is lime, and the addition amount is 600 g / t; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the addition amount of the zinc inhibitor is: 300 g / t zinc sulfate and 100 g / t sodium sulfite;

[0091] The lead concentrate 1 is added with a sulfur inhibitor and a zinc inhibitor for a second lead concentration to obtain a lead concentrate 2 and a lead tailing 2; the lead tailing 2 is returned to the first lead concentration; the sulfur inhibitor is lime, and the addition amount is 300g / t; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the addition amount of the zinc inhibitor is: 150g / t zinc sulfate and 50g / t sodium sulfite;

[0092] The lead concentrate 1 is subjected to a third lead concentration without adding reagents to obtain a lead concentrate and a lead concentrate tailing 3; the lead concentrate tailing 3 is returned to the second lead concentration;

[0093] 4) adding a lead collector to the lead roughing tailings for the first lead scavenging to obtain a lead scavenging concentrate 1 and a lead scavenging tailing 1; the lead scavenging concentrate 1 and the lead concentrated tailing 1 are returned to the lead roughing; the lead collector is a combination of butylammonium black medicine and alkylthiocarbamate, wherein the mass ratio of butylammonium black medicine to alkylthiocarbamate is 8:2, and the amount of the lead collector added is 25 g / t;

[0094] The lead scavenging tailing 1 is added with a lead collector for a second lead scavenging to obtain a lead scavenging concentrate 2 and a lead scavenging tailing 2; the lead scavenging concentrate 2 is returned to the first lead scavenging. The lead collector is a combination of butylammonium black powder and alkylthiocarbamate, wherein the mass ratio of butylammonium black powder to alkylthiocarbamate is 8:2, and the amount of the lead collector added is 12.5 g / t;

[0095] The lead scavenging tailing 2 is sequentially added with a sulfur inhibitor, a zinc activator, a zinc collector and a foaming agent to carry out zinc roughing to obtain a zinc roughing concentrate and a zinc roughing tailing; the sulfur inhibitor is lime, and the addition amount is 1000g / t; the zinc activator is copper sulfate, and the addition amount is 200g / t; the zinc collector is butyl xanthate, and the addition amount is 50g / t; the foaming agent is pine oil, and the addition amount is 10g / t;

[0096] The zinc rougher concentrate is added with a sulfur inhibitor for the first zinc concentration to obtain a zinc concentrate 1 and a zinc concentrate tailing 1; the sulfur inhibitor is lime, and the addition amount is 500g / t;

[0097] The zinc concentrate 1 is added with a sulfur inhibitor for a second zinc concentration to obtain a zinc concentrate 2 and a zinc tailing 2; the zinc tailing 2 is returned to the first zinc concentration; the sulfur inhibitor is lime, and the addition amount is 250g / t;

[0098] The zinc concentrate 2 is subjected to a third zinc concentration without adding reagents to obtain zinc concentrate and zinc concentrate tailings 3; the zinc concentrate tailings 3 are returned to the second zinc concentration;

[0099] The zinc roughing tailings are added with a zinc collector for the first zinc scavenging to obtain a zinc scavenging concentrate 1 and a zinc scavenging tailing 1; the zinc scavenging concentrate 1 and the zinc concentrating tailing 1 are combined and returned to the zinc roughing; the zinc collector is butyl xanthate, and the addition amount is 25g / t;

[0100] The zinc scavenging tailing 1 is added with a zinc collector for a second zinc scavenging to obtain a zinc scavenging concentrate 2 and tailings; the zinc scavenging concentrate 2 is returned to the first zinc scavenging. The zinc collector is butyl xanthate, and the addition amount is 12.5 g / t; the test results are shown in Table 7.

[0101] Table 7 Flotation test results / %

[0102]

[0103] Comparative Example 5

[0104] The other conditions are consistent with those in Example 3, except that no lead flocculant is added. The test results are shown in Table 8.

[0105] Table 8 Flotation test results / %

[0106]

[0107]

[0108] Comparative Example 3

[0109] The other conditions are consistent with those in Example 3, except that no lead flocculant is added. The test results are shown in Table 9.

[0110] Table 9 Flotation test results / %

[0111]

[0112] In summary, the use of butylamine black medicine and alkylthiocarbamate as a lead collector, and polyvinyl ether as a lead flocculant can achieve a higher lead recovery rate and a higher zinc grade. When only butylamine black medicine is used as a lead collector, or polyvinyl ether is not added, the lead recovery rate in the lead concentrate will be reduced, some fine galena particles cannot float, and the zinc grade in the zinc concentrate will be reduced, making it difficult to achieve efficient separation and recovery of lead and zinc resources.

Claims

1. A lead-zinc ore flotation method for enhancing the recovery of fine galena, characterized in that: The following steps are involved: S1. Crushing and grinding the raw ore to obtain grinding products; S2. The ore grinding product obtained in step S1 is subjected to lead roughing to obtain lead roughing concentrate and lead roughing tailings; S3. The lead rougher concentrate is subjected to three lead concentrations to obtain a lead concentrate; S4. The lead roughing tailings are subjected to two lead scavenging selections, zinc roughing selections, three zinc cleaning selections and two zinc scavenging selections to obtain zinc concentrate and tailings.

2. The lead-zinc ore flotation method for enhancing the recovery of fine-grained galena according to claim 1, characterized in that: In step S1, the -0.074 mm particle size accounts for 80% to 90% of the ground product.

3. The lead-zinc ore flotation method for enhancing the recovery of fine-grained galena according to claim 1, characterized in that: In step S2, the reagent system for lead roughing is: adding sulfur inhibitor, zinc inhibitor, lead collector, lead flocculant and foaming agent in sequence; the sulfur inhibitor is added in an amount of 1000-5000 g / t; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, the zinc sulfate is added in an amount of 600-2100 g / t, and the sodium pyrosulfite is added in an amount of 200-700 g / t; the lead collector is added in an amount of 50-100 g / t; the lead flocculant is added in an amount of 10-30 g / t; and the foaming agent is added in an amount of 10-30 g / t.

4. The lead-zinc ore flotation method for enhancing the recovery of fine-grained galena according to claim 3, characterized in that: The sulfur inhibitor is lime; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1; the lead collector is a combination of butyl ammonium black powder and alkyl thiocarbamate, wherein the mass ratio of butyl ammonium black powder to alkyl thiocarbamate is (7-27):3; the alkyl thiocarbamate is one of dibutyl dithiocarbamate and dibenzyl dithiocarbamate; the lead flocculant is polyvinyl ether; and the foaming agent is at least one of pine oil and methyl isobutyl carbinol.

5. The lead-zinc ore flotation method for enhancing the recovery of fine galena according to claim 1, characterized in that: In step S3, the three lead cleaning steps are as follows: The lead roughing concentrate is added with a sulfur inhibitor and a zinc inhibitor for the first lead concentration to obtain a lead concentrate 1 and a lead concentrate tailing 1; the sulfur inhibitor is lime, and the addition amount is one-fifth of that of the lead roughing concentrate; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the addition amount of the zinc inhibitor is half of that of the lead roughing concentrate; The lead concentrate 1 is added with a sulfur inhibitor and a zinc inhibitor for a second lead concentration to obtain a lead concentrate 2 and a lead concentrate tailing 2; the lead concentrate tailing 2 is returned to the first lead concentration; the sulfur inhibitor is lime, and the amount added is half of that in the first lead concentration; the zinc inhibitor is a combination of zinc sulfate and sodium pyrosulfite, wherein the mass ratio of zinc sulfate to sodium pyrosulfite is 3:1, and the amount of the zinc inhibitor added is half of that in the first lead concentration; The lead concentrate 1 is subjected to a third lead concentration without adding reagents to obtain lead concentrate and lead concentrate tailings 3; and the lead concentrate tailings 3 are returned to the second lead concentration.

6. The lead-zinc ore flotation method for enhancing the recovery of fine-grained galena according to claim 1, characterized in that: In step S4, the lead scanning is specifically as follows: The lead roughing tailings are added with a lead collector for the first lead scavenging to obtain a lead scavenging concentrate 1 and a lead scavenging tailing 1; the lead scavenging concentrate 1 and the lead concentrating tailing 1 are returned to the lead roughing; the lead collector is a combination of butylammonium black medicine and alkylthiocarbamate, wherein the mass ratio of butylammonium black medicine to alkylthiocarbamate is (7-27):3, and the amount of the lead collector added is half of that of the lead roughing; Lead scavenging tailings 1 are added with a lead collector for a second lead scavenging to obtain lead scavenging concentrate 2 and lead scavenging tailings 2; the lead scavenging concentrate 2 is returned to the first lead scavenging; the lead collector is a combination of butylammonium black powder and alkylthiocarbamate, wherein the mass ratio of butylammonium black powder to alkylthiocarbamate is (7-27):3, and the amount of lead collector added is half of that in the first lead scavenging.

7. The lead-zinc ore flotation method for enhancing the recovery of fine galena according to claim 1, characterized in that: In step S4, the zinc roughing is specifically as follows: A sulfur inhibitor, a zinc activator, a zinc collector and a foaming agent are sequentially added to the lead scavenging tailings 2 for zinc roughing to obtain a zinc roughing concentrate and a zinc roughing tailings; the sulfur inhibitor is lime, and the addition amount is 500-2000 g / t; the zinc activator is copper sulfate, and the addition amount is 200-400 g / t; the zinc collector is butyl xanthate, and the addition amount is 50-120 g / t; the foaming agent is at least one of pine oil and methyl isobutyl carbinol, and the addition amount is 10-30 g / t.

8. The lead-zinc ore flotation method for enhancing the recovery of fine galena according to claim 1, characterized in that: The three zinc concentrations are specifically: The zinc rougher concentrate is added with a sulfur inhibitor for the first zinc concentration to obtain a zinc concentrate 1 and a zinc concentrate tailing 1; the sulfur inhibitor is lime, and the amount added is half of that of the zinc rougher; The zinc concentrate 1 is added with a sulfur inhibitor for a second zinc concentration to obtain a zinc concentrate 2 and a zinc tailing 2; the zinc tailing 2 is returned to the first zinc concentration; the sulfur inhibitor is lime, and the amount added is half of that of the first zinc concentration; The zinc concentrate 2 is subjected to a third zinc concentration without adding reagents to obtain zinc concentrate and zinc concentrate tailings 3; the zinc concentrate tailings 3 are returned to the second zinc concentration.

9. The lead-zinc ore flotation method for enhancing the recovery of fine galena according to claim 1, characterized in that: The two zinc sweeps are specifically: The zinc roughing tailings are added with a zinc collector for the first zinc scavenging to obtain a zinc scavenging concentrate 1 and a zinc scavenging tailing 1; the zinc scavenging concentrate 1 and the zinc concentrating tailing 1 are combined and returned to the zinc roughing; the zinc collector is butyl xanthate, and the addition amount is half of that of the zinc roughing; The zinc scavenging tailing 1 is added with a zinc collector for a second zinc scavenging to obtain a zinc scavenging concentrate 2 and tailings; the zinc scavenging concentrate 2 is returned to the first zinc scavenging; the zinc collector is butyl xanthate, and the addition amount is half of the first zinc scavenging.

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