Gravity-flotation combined beneficiation method for carbon-containing lead-zinc sulfide ore

Abstract

The invention discloses a gravity-flotation combined beneficiation method for carbon-containing lead-zinc sulfide ore, which comprises the following steps of: grinding raw ore, sequentially adding a carbon collecting agent and a foaming agent, removing amorphous carbon in the raw ore through a flotation process, and carrying out roughing, scavenging, concentration and flotation on flotation concentrate to obtain lead concentrate and lead concentrate tailings, and the lead flotation tailings are subjected to roughing, scavenging, concentration and flotation, and zinc concentrate is obtained. The method is simple and convenient in technological process, easy for industrial production, convenient for cost reduction, good in adaptability to the amorphous carbon-containing lead-zinc sulfide ore, and capable of effectively avoiding adverse effects of amorphous carbon on lead-zinc flotation and obtaining better lead-zinc flotation indexes.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing engineering, and in particular relates to a gravity-flotation combined beneficiation method for carbon-containing lead-zinc sulfide ore. Background Art

[0002] Metallic lead and zinc have excellent properties such as good calendering and corrosion resistance. They are widely used in machinery, ships, batteries and other industries, and play an important role in industrial and economic development. Lead and zinc mainly exist in the form of sulfides, and are currently mainly separated from lead-zinc sulfide ores by flotation. The formation of sedimentary lead-zinc deposits (such as the Mississippi Valley type) mainly depends on sedimentation, which enriches lead and zinc elements. During the sedimentation process, organic matter undergoes a series of geological processes and material migration, and finally exists in the lead-zinc ore in the form of amorphous carbon. Therefore, sedimentary lead-zinc deposits often contain amorphous carbon. Amorphous carbon is a carbon material without a specific shape and periodic structure. It has the characteristics of rich pore structure, fine particle size, and large specific surface area. In the flotation process of lead-zinc sulfide ores, amorphous carbon will adsorb a large amount of collectors, resulting in reagent waste and cost increase. In addition, excessive consumption of collectors makes it difficult for lead-zinc sulfide ores to float, which seriously affects the efficient recovery of lead-zinc resources. Summary of the invention

[0003] The object of the present invention is to provide a combined gravity-flotation beneficiation method for carbon-containing lead-zinc sulfide ore, so as to solve the problem of poor separation index caused by amorphous carbon in the flotation process of lead-zinc sulfide ore.

[0004] The gravity-flotation combined beneficiation method for carbon-containing lead-zinc sulfide ore provided by the present invention comprises the following steps:

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

[0006] S2. Adding a carbon collector and a frother to the grinding product obtained in step S1, slurrying is performed, and then the slurry is transported to a table flotation table to obtain a table flotation table concentrate and carbon-containing tailings;

[0007] S3. The flotation table concentrate obtained in step S2 is transferred to the flotation system, and the lead concentrate and lead tailings are obtained by roughing, scavenging and concentrating;

[0008] S4. The lead tailings obtained in step S3 are subjected to roughing, scavenging and concentrating to obtain zinc concentrate and tailings.

[0009] Furthermore, in step S1, the -0.074 mm particle size accounts for 70% to 90% of the ground product.

[0010] Furthermore, in step S2, the carbon collector is a mixture of kerosene and lauryl alcohol polyether, wherein the mass ratio of kerosene to lauryl alcohol polyether is 16:4-19:1, and the added amount is 10-30 g / t, where g / t is calculated based on the mass of the original ore; the foaming agent is at least one of pine oil or methyl isobutyl carbinol, and the added amount is 10-30 g / t, where g / t is calculated based on the mass of the original ore.

[0011] Further, step S3 includes one lead roughing selection, two lead sweeping selections and three lead cleaning selections, specifically:

[0012] First, the table flotation table concentrate obtained in step S2 is subjected to lead roughing to obtain lead roughing concentrate and lead roughing tailings;

[0013] The lead roughing concentrate is subjected to three lead concentrations. Lead concentration II uses the lead concentration concentrate 1 obtained from lead concentration I as raw material, and lead concentration III uses the lead concentration concentrate 2 obtained from lead concentration II as raw material; the concentrate obtained from lead concentration III is used as lead concentrate; the tailings obtained from lead concentration III are returned to the flotation of lead concentration II; the tailings obtained from lead concentration II are returned to the flotation of lead concentration I; the tailings obtained from lead concentration I are returned to the lead roughing concentrate;

[0014] The lead roughing tailings are subjected to two lead scavengings. Lead scavenging II uses the lead scavenging tailings 1 obtained from lead scavenging I as raw material; the lead scavenging concentrate 1 obtained from lead scavenging I is returned to the flotation of the lead roughing; the lead scavenging concentrate 2 obtained from lead scavenging II is returned to the flotation of lead scavenging I; the tailings obtained from lead scavenging II are used as lead selection tailings.

[0015] In the lead roughing, sulfur inhibitor, zinc inhibitor, lead collector and foaming agent are sequentially added to carry out lead roughing; wherein the foaming agent is at least one of pine oil or methyl isobutyl carbinol, and the addition amount is 10-30 g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, and the addition amount is 1000-6000 g / t, g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the mass ratio of zinc sulfate to sodium sulfite is 2:1, the addition amount of zinc sulfate is 400-2000 g / t, and the addition amount of sodium sulfite is 200-1000 g / t, g / t is calculated based on the mass of the original ore; the lead collector is at least one of ethylthiocyanate, butylamine black medicine, and ethyl xanthate, and the addition amount of the lead collector is 50-100 g / t, g / t is calculated based on the mass of the original ore;

[0016] A sulfur inhibitor and a zinc inhibitor are sequentially added to the lead concentration I to carry out lead concentration I; wherein the sulfur inhibitor is lime, and the amount used is 500-1500 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the mass ratio of zinc sulfate to sodium sulfite is 2:1, the amount of zinc sulfate added is 200-500 g / t, and the amount of sodium sulfite added is 100-250 g / t, where g / t is calculated based on the mass of the original ore;

[0017] A sulfur inhibitor and a zinc inhibitor are sequentially added to the lead concentration II to carry out lead concentration II; wherein the sulfur inhibitor is lime, and the amount used is 250-750 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the mass ratio of zinc sulfate to sodium sulfite is 2:1, the amount of zinc sulfate added is 100-250 g / t, and the amount of sodium sulfite added is 50-125 g / t, where g / t is calculated based on the mass of the original ore;

[0018] The lead selection III is blank selection;

[0019] A lead collector is added to the lead scavenging I to carry out lead scavenging I; the lead collector is at least one of ethylthiocyanate, butylamine black medicine, and ethyl xanthate, and the amount of the lead collector added is 25-50g / t, where g / t is calculated based on the mass of the original ore;

[0020] A lead collector is added to the lead scavenging II to carry out lead scavenging II; the lead collector is at least one of ethylthiocyanate, butylamine black medicine, and ethyl xanthate, and the amount of the lead collector added is 10-25g / t, where g / t is calculated based on the mass of the original ore;

[0021] Further, step S4 includes one zinc roughing selection, two zinc sweeping selections and three zinc concentrating selections, specifically:

[0022] Firstly, the lead tailings obtained in step S3 are subjected to zinc roughing to obtain zinc roughing concentrate and zinc roughing tailings;

[0023] The zinc rougher concentrate is subjected to three zinc concentrations. Zinc Concentration II uses the zinc concentrate 1 obtained from zinc concentration I as raw material, and zinc concentration III uses the zinc concentrate 2 obtained from zinc concentration II as raw material; the concentrate obtained from zinc concentration III is used as zinc concentrate; the tailings obtained from zinc concentration III are returned to the flotation of zinc concentration II; the tailings obtained from zinc concentration II are returned to the flotation of zinc concentration I; the tailings obtained from zinc concentration I are returned to the zinc rougher concentrate;

[0024] The zinc roughing tailings are subjected to two zinc scavengings. Zinc scavenging II uses zinc scavenging tailings 1 obtained from zinc scavenging I as raw material; zinc scavenging concentrate 1 obtained from zinc scavenging I is returned to zinc roughing; zinc scavenging concentrate 2 obtained from zinc scavenging II is returned to the flotation of zinc scavenging I; and the tailings obtained from zinc scavenging II are used as the final tailings.

[0025] In the zinc roughing, a sulfur inhibitor, a zinc activator, a zinc collector and a foaming agent are sequentially added to carry out zinc roughing; wherein the foaming agent is at least one of pine oil or methyl isobutyl carbinol, and the addition amount is 10-30 g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, and the addition amount is 500-2000 g / t, g / t is calculated based on the mass of the original ore; the zinc activator is copper sulfate, and the addition amount is 200-500 g / t, g / t is calculated based on the mass of the original ore; the zinc collector is at least one of butyl xanthate and ethyl thiocarbamate, and the addition amount of the zinc collector is 60-120 g / t, g / t is calculated based on the mass of the original ore;

[0026] A sulfur inhibitor is added to the zinc concentration I to perform lead concentration I; the sulfur inhibitor is lime, and the amount used is 250-1000 g / t, where g / t is calculated based on the mass of the original ore;

[0027] A sulfur inhibitor is added to the zinc concentration II to carry out lead concentration II; the sulfur inhibitor is lime, and the amount used is 100-500 g / t, where g / t is calculated based on the mass of the original ore;

[0028] The zinc concentration III is blank concentration;

[0029] A zinc collector is added to the zinc scavenging I to carry out lead scavenging I; the zinc collector is at least one of butyl xanthate and ethiocarbamate, and the amount used is 30-60 g / t, where g / t is calculated based on the mass of the original ore;

[0030] A zinc collector is added to the zinc scavenging II to carry out lead scavenging II; the zinc collector is at least one of butyl xanthate and ethylthiocarbamate, and the amount used is 15-30 g / t, where g / t is calculated based on the mass of the original ore;

[0031] Principle of the present invention:

[0032] For lead-zinc sulfide ores containing amorphous carbon, lauryl alcohol polyether is used as an emulsifier for kerosene to synthesize a carbon collector based on the characteristics of fine amorphous carbon particles, low density, and strong surface hydrophobicity, to strengthen the dispersion of kerosene in the slurry system and increase its effective concentration. After the carbon collector acts, it is removed in advance by using the equipment advantages of the table flotation shaker to prevent it from entering the flotation process of the lead-zinc sulfide ore. In addition, based on the difference in density between lead-zinc sulfide minerals and gangue minerals such as calcite, quartz, dolomite, mica, and chlorite, the table flotation process is used to separate some gangue minerals with fine particles and low density, which improves the lead and zinc grades entering the flotation of the lead-zinc sulfide ore to a certain extent, which is conducive to obtaining high-quality lead and zinc concentrates.

[0033] Beneficial effects of the present invention:

[0034] (1) The method of the present invention uses lauryl alcohol polyether as an emulsifier for kerosene to synthesize a carbon collector, which effectively avoids the adverse consequences of excessive reagent consumption and low flotation recovery rate of lead-zinc sulfide minerals caused by amorphous carbon;

[0035] (2) The method of the present invention adopts the table flotation process to improve the lead and zinc grades entering the flotation of the lead-zinc sulfide ore, save the reagent consumption in the flotation process of the lead-zinc sulfide ore, help to recover the lead-zinc sulfide minerals, and facilitate the acquisition of high-quality lead and zinc concentrates;

[0036] (3) The process flow of the present invention is simple and easy to industrially produce, and can effectively avoid the adverse effects of amorphous carbon on lead and zinc flotation, thereby obtaining better lead and zinc flotation indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0038] A carbon-containing lead-zinc sulfide ore has a Pb grade of 0.36%, a Zn grade of 2.59%, and an amorphous carbon content of 0.87%. The method of the present invention is used for gravity-flotation combined ore dressing, which includes the following steps:

[0039] S1. Crushing and grinding the raw ore to obtain grinding products; the -0.074mm particle size accounts for 70% of the obtained grinding products;

[0040] S2. Adding a carbon collector and a frother to the grinding product obtained in step S1, slurrying is performed, and then the slurry is transported to a table flotation table to obtain a table flotation table concentrate and carbon-containing tailings;

[0041] The carbon collector is a mixture of kerosene and lauryl alcohol polyether, wherein the mass ratio of kerosene to lauryl alcohol polyether is 16:4, and the addition amount is 10 g / t, where g / t is calculated based on the mass of the original ore;

[0042] The foaming agent is pine oil, and the added amount is 10g / t, where g / t is calculated based on the mass of the original ore.

[0043] S3. The flotation table concentrate obtained in step S2 is transferred to the flotation system, and the lead concentrate and lead tailings are obtained by roughing, scavenging and concentrating;

[0044] Performing lead roughing on the table flotation shaking table concentrate obtained in step S2 to obtain lead roughing concentrate and lead roughing tailings;

[0045] The lead roughing concentrate is subjected to three lead concentrations. Lead concentration II uses the lead concentration concentrate 1 obtained from lead concentration I as raw material, and lead concentration III uses the lead concentration concentrate 2 obtained from lead concentration II as raw material; the concentrate obtained from lead concentration III is used as lead concentrate; the tailings obtained from lead concentration III are returned to the flotation of lead concentration II; the tailings obtained from lead concentration II are returned to the flotation of lead concentration I; the tailings obtained from lead concentration I are returned to the lead roughing concentrate;

[0046] The lead roughing tailings are subjected to two lead scavengings. Lead scavenging II uses the lead scavenging tailings 1 obtained from lead scavenging I as raw material; the lead scavenging concentrate 1 obtained from lead scavenging I is returned to the flotation of the lead roughing; the lead scavenging concentrate 2 obtained from lead scavenging II is returned to the flotation of lead scavenging I; the tailings obtained from lead scavenging II are used as lead selection tailings.

[0047] In the lead roughing, sulfur inhibitor, zinc inhibitor, lead collector and foaming agent are added in sequence to carry out lead roughing; wherein the foaming agent is pine oil, and the addition amount is 10 g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, and the addition amount is 1000 g / t, g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the addition amount of zinc sulfate is 400 g / t, and the sodium sulfite is 200 g / t, g / t is calculated based on the mass of the original ore; the lead collector is butylamine black medicine, and the addition amount is 50 g / t, g / t is calculated based on the mass of the original ore;

[0048] The lead concentration I is sequentially added with a sulfur inhibitor and a zinc inhibitor to carry out lead concentration I; wherein the sulfur inhibitor is lime, and the amount used is 500 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the amount of zinc sulfate added is 200 g / t, and the amount of sodium sulfite added is 100 g / t, where g / t is calculated based on the mass of the original ore;

[0049] The lead concentration II is sequentially added with a sulfur inhibitor and a zinc inhibitor to carry out lead concentration II; wherein the sulfur inhibitor is lime, and the amount used is 250 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the amount of zinc sulfate added is 100 g / t, and the amount of sodium sulfite added is 50 g / t, where g / t is calculated based on the mass of the original ore;

[0050] The lead selection III is blank selection;

[0051] A lead collector is added to the lead scavenging I to carry out lead scavenging I; the lead collector is butylamine black medicine, and the dosage is 25g / t, where g / t is calculated based on the mass of the original ore;

[0052] A lead collector is added to the lead scavenging II to carry out lead scavenging II; the lead collector is butylamine black medicine, and the dosage is 10g / t, where g / t is calculated based on the mass of the original ore;

[0053] S4. The lead tailings obtained in step S3 are subjected to roughing, scavenging and concentrating to obtain zinc concentrate and tailings.

[0054] Performing zinc roughing on the lead tailings obtained in step S3 to obtain zinc roughing concentrate and zinc roughing tailings;

[0055] The zinc rougher concentrate is subjected to three zinc concentrations. Zinc Concentration II uses the zinc concentrate 1 obtained from zinc concentration I as raw material, and zinc concentration III uses the zinc concentrate 2 obtained from zinc concentration II as raw material; the concentrate obtained from zinc concentration III is used as zinc concentrate; the tailings obtained from zinc concentration III are returned to the flotation of zinc concentration II; the tailings obtained from zinc concentration II are returned to the flotation of zinc concentration I; the tailings obtained from zinc concentration I are returned to the zinc rougher concentrate;

[0056] The zinc roughing tailings are subjected to two zinc scavengings. Zinc scavenging II uses zinc scavenging tailings 1 obtained from zinc scavenging I as raw material; zinc scavenging concentrate 1 obtained from zinc scavenging I is returned to the flotation of zinc roughing; zinc scavenging concentrate 2 obtained from zinc scavenging II is returned to the flotation of zinc scavenging I; and the tailings obtained from zinc scavenging II are used as the final tailings.

[0057] In the zinc roughing, a sulfur inhibitor, a zinc activator, a zinc collector and a foaming agent are sequentially added to carry out zinc roughing; wherein the foaming agent is pine oil, and the addition amount is 10 g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, and the addition amount is 500 g / t, g / t is calculated based on the mass of the original ore; the zinc activator is copper sulfate, and the addition amount is 200 g / t, g / t is calculated based on the mass of the original ore; the zinc collector is butyl xanthate, and the addition amount is 60 g / t, g / t is calculated based on the mass of the original ore;

[0058] A sulfur inhibitor is added to the zinc concentration I to perform lead concentration I; the sulfur inhibitor is lime, and the amount used is 250 g / t, where g / t is calculated based on the mass of the original ore;

[0059] A sulfur inhibitor is added to the zinc concentration II to carry out lead concentration II; the sulfur inhibitor is lime, and the amount used is 100 g / t, where g / t is calculated based on the mass of the original ore;

[0060] The zinc concentration III is blank concentration;

[0061] A zinc collector is added to the zinc scavenging I to carry out lead scavenging I; the zinc collector is butyl xanthate, and the dosage is 30 g / t, where g / t is calculated based on the mass of the original ore;

[0062] A zinc collector is added to the zinc scavenging II to carry out lead scavenging II; the zinc collector is butyl xanthate, and the dosage is 15g / t, where g / t is calculated based on the mass of the original ore;

[0063] The experimental results are shown in Table 1.

[0064] Table 1 Flotation test results / %

[0065]

[0066]

[0067] Comparative Example 1

[0068] The other conditions were consistent with those in Example 1, except that the table flotation process for removing amorphous carbon in step S2 was not performed, and lead and zinc flotation recovery was directly carried out. The test results are shown in Table 2.

[0069] Table 2 Flotation test results / %

[0070]

[0071] Comparative Example 2

[0072] The other conditions are the same as those in Example 1, except that the carbon collector is only kerosene. The test results are shown in Table 3.

[0073] Table 3 Flotation test results / %

[0074]

[0075]

[0076] Example 2

[0077] A carbon-containing lead-zinc sulfide ore has a Pb grade of 1.07%, a Zn grade of 2.98%, and an amorphous carbon content of 1.24%. The method of the present invention is used for gravity-flotation combined ore dressing, which includes the following steps:

[0078] S1. Crushing and grinding the raw ore to obtain grinding products; the -0.074mm particle size accounts for 90% of the obtained grinding products;

[0079] S2. Adding a carbon collector and a frother to the grinding product obtained in step S1, slurrying is performed, and then the slurry is transported to a table flotation table to obtain a table flotation table concentrate and carbon-containing tailings;

[0080] The carbon collector is a mixture of kerosene and lauryl alcohol polyether, wherein the mass ratio of kerosene to lauryl alcohol polyether is 19:1, and the addition amount is 20 g / t, where g / t is calculated based on the mass of the original ore;

[0081] The foaming agent is pine oil, and the added amount is 20g / t, where g / t is calculated based on the mass of the original ore.

[0082] S3. The flotation table concentrate obtained in step S2 is transferred to the flotation system, and the lead concentrate and lead tailings are obtained by roughing, scavenging and concentrating;

[0083] Performing lead roughing on the table flotation shaking table concentrate obtained in step S2 to obtain lead roughing concentrate and lead roughing tailings;

[0084] The lead roughing concentrate is subjected to three lead concentrations. Lead concentration II uses the lead concentration concentrate 1 obtained from lead concentration I as raw material, and lead concentration III uses the lead concentration concentrate 2 obtained from lead concentration II as raw material; the concentrate obtained from lead concentration III is used as lead concentrate; the tailings obtained from lead concentration III are returned to the flotation of lead concentration II; the tailings obtained from lead concentration II are returned to the flotation of lead concentration I; the tailings obtained from lead concentration I are returned to the lead roughing concentrate;

[0085] The lead roughing tailings are subjected to two lead scavengings. Lead scavenging II uses the lead scavenging tailings 1 obtained from lead scavenging I as raw material; the lead scavenging concentrate 1 obtained from lead scavenging I is returned to the flotation of the lead roughing; the lead scavenging concentrate 2 obtained from lead scavenging II is returned to the flotation of lead scavenging I; the tailings obtained from lead scavenging II are used as lead selection tailings.

[0086] In the lead roughing, a sulfur inhibitor, a zinc inhibitor, a lead collector and a foaming agent are sequentially added to carry out lead roughing; wherein the foaming agent is methyl isobutyl carbinol, and the addition amount is 20 g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, and the addition amount is 3000 g / t, g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the addition amount of zinc sulfate is 1000 g / t, and the sodium sulfite is 500 g / t, g / t is calculated based on the mass of the original ore; the lead collector is ethyl thiocyanate, and the addition amount is 80 g / t, g / t is calculated based on the mass of the original ore;

[0087] The lead concentration I is sequentially added with a sulfur inhibitor and a zinc inhibitor to carry out lead concentration I; wherein the sulfur inhibitor is lime, and the amount used is 1000 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the amount of zinc sulfate added is 500 g / t, and the amount of sodium sulfite added is 250 g / t, where g / t is calculated based on the mass of the original ore;

[0088] A sulfur inhibitor and a zinc inhibitor are sequentially added to the lead concentration II to carry out lead concentration II; wherein the sulfur inhibitor is lime, and the amount used is 300 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the amount of zinc sulfate added is 250 g / t, and the amount of sodium sulfite added is 125 g / t, where g / t is calculated based on the mass of the original ore;

[0089] The lead selection III is blank selection;

[0090] A lead collector is added to the lead scavenging I to carry out lead scavenging I; the lead collector is ethyl thiocyanate, and the amount used is 40g / t, where g / t is calculated based on the mass of the original ore;

[0091] A lead collector is added to the lead scavenging II to carry out lead scavenging II; the lead collector is ethyl thiocyanate, and the dosage is 20 g / t, where g / t is calculated based on the mass of the original ore;

[0092] S4. The lead tailings obtained in step S3 are subjected to roughing, scavenging and concentrating to obtain zinc concentrate and tailings.

[0093] Performing zinc roughing on the lead tailings obtained in step S3 to obtain zinc roughing concentrate and zinc roughing tailings;

[0094] The zinc rougher concentrate is subjected to three zinc concentrations. Zinc Concentration II uses the zinc concentrate 1 obtained from zinc concentration I as raw material, and zinc concentration III uses the zinc concentrate 2 obtained from zinc concentration II as raw material; the concentrate obtained from zinc concentration III is used as zinc concentrate; the tailings obtained from zinc concentration III are returned to the flotation of zinc concentration II; the tailings obtained from zinc concentration II are returned to the flotation of zinc concentration I; the tailings obtained from zinc concentration I are returned to the zinc rougher concentrate;

[0095] The zinc roughing tailings are subjected to two zinc scavengings. Zinc scavenging II uses zinc scavenging tailings 1 obtained from zinc scavenging I as raw material; zinc scavenging concentrate 1 obtained from zinc scavenging I is returned to the flotation of zinc roughing; zinc scavenging concentrate 2 obtained from zinc scavenging II is returned to the flotation of zinc scavenging I; and the tailings obtained from zinc scavenging II are used as the final tailings.

[0096] In the zinc roughing, sulfur inhibitor, zinc activator, zinc collector and foaming agent are sequentially added to carry out zinc roughing; wherein, the foaming agent is methyl isobutyl carbinol, the addition amount is 20g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, the addition amount is 1500g / t, g / t is calculated based on the mass of the original ore; the zinc activator is copper sulfate, the addition amount is 300g / t, g / t is calculated based on the mass of the original ore; the zinc collector is ethylthiocarbamate, the addition amount is 90g / t, g / t is calculated based on the mass of the original ore;

[0097] A sulfur inhibitor is added to the zinc concentration I to perform lead concentration I; the sulfur inhibitor is lime, and the amount used is 800g / t, where g / t is calculated based on the mass of the original ore;

[0098] A sulfur inhibitor is added to the zinc concentration II to carry out lead concentration II; the sulfur inhibitor is lime, and the amount used is 400g / t, where g / t is calculated based on the mass of the original ore;

[0099] The zinc concentration III is blank concentration;

[0100] A zinc collector is added to the zinc scavenging I to carry out lead scavenging I; the zinc collector is ethiocarbamate, and the addition amount is 45 g / t, where g / t is calculated based on the mass of the original ore;

[0101] A zinc collector is added to the zinc scavenging II to carry out lead scavenging II; the zinc collector is ethiocarbamate, and the addition amount is 25 g / t, where g / t is calculated based on the mass of the original ore;

[0102] The experimental results are shown in Table 4.

[0103] Table 4 Flotation test results / %

[0104]

[0105] Comparative Example 3

[0106] The other conditions were consistent with those in Example 2, except that the table flotation process for removing amorphous carbon in step S2 was not performed, and lead and zinc flotation recovery was directly carried out. The test results are shown in Table 5.

[0107] Table 5 Flotation test results / %

[0108]

[0109] Comparative Example 4

[0110] The other conditions are the same as those in Example 2, except that the carbon collector is only kerosene. The test results are shown in Table 6.

[0111] Table 6 Flotation test results / %

[0112]

[0113] Example 3

[0114] A carbon-containing lead-zinc sulfide ore has a Pb grade of 2.31%, a Zn grade of 13.66%, and an amorphous carbon content of 1.88%. The method of the present invention is used for gravity-flotation combined ore dressing, which includes the following steps:

[0115] S1. Crushing and grinding the raw ore to obtain grinding products; the -0.074mm particle size accounts for 80% of the obtained grinding products;

[0116] S2. Adding a carbon collector and a frother to the grinding product obtained in step S1, slurrying is performed, and then the slurry is transported to a table flotation table to obtain a table flotation table concentrate and carbon-containing tailings;

[0117] The carbon collector is a mixture of kerosene and lauryl alcohol polyether, wherein the mass ratio of kerosene to lauryl alcohol polyether is 18:2, and the addition amount is 30 g / t, where g / t is calculated based on the mass of the original ore;

[0118] The foaming agent is pine oil, and the added amount is 30g / t, where g / t is calculated based on the mass of the original ore.

[0119] S3. The flotation table concentrate obtained in step S2 is transferred to the flotation system, and the lead concentrate and lead tailings are obtained by roughing, scavenging and concentrating;

[0120] Performing lead roughing on the table flotation shaking table concentrate obtained in step S2 to obtain lead roughing concentrate and lead roughing tailings;

[0121] The lead roughing concentrate is subjected to three lead concentrations. Lead concentration II uses the lead concentration concentrate 1 obtained from lead concentration I as raw material, and lead concentration III uses the lead concentration concentrate 2 obtained from lead concentration II as raw material; the concentrate obtained from lead concentration III is used as lead concentrate; the tailings obtained from lead concentration III are returned to the flotation of lead concentration II; the tailings obtained from lead concentration II are returned to the flotation of lead concentration I; the tailings obtained from lead concentration I are returned to the lead roughing concentrate;

[0122] The lead roughing tailings are subjected to two lead scavengings. Lead scavenging II uses the lead scavenging tailings 1 obtained from lead scavenging I as raw material; the lead scavenging concentrate 1 obtained from lead scavenging I is returned to the flotation of the lead roughing; the lead scavenging concentrate 2 obtained from lead scavenging II is returned to the flotation of lead scavenging I; the tailings obtained from lead scavenging II are used as lead selection tailings.

[0123] In the lead roughing, sulfur inhibitor, zinc inhibitor, lead collector and foaming agent are added in sequence to carry out lead roughing; wherein the foaming agent is pine oil, and the addition amount is 30 g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, and the addition amount is 6000 g / t, g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the addition amount of zinc sulfate is 2000 g / t, and the sodium sulfite is 1000 g / t, g / t is calculated based on the mass of the original ore; the lead collector is ethyl xanthate, and the addition amount is 100 g / t, g / t is calculated based on the mass of the original ore;

[0124] The lead concentration I is sequentially added with a sulfur inhibitor and a zinc inhibitor to carry out lead concentration I; wherein the sulfur inhibitor is lime, and the amount used is 1500 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the amount of zinc sulfate added is 500 g / t, and the amount of sodium sulfite added is 250 g / t, where g / t is calculated based on the mass of the original ore;

[0125] A sulfur inhibitor and a zinc inhibitor are sequentially added to the lead concentration II to carry out lead concentration II; wherein the sulfur inhibitor is lime, and the amount used is 750 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the amount of zinc sulfate added is 250 g / t, and the amount of sodium sulfite added is 125 g / t, where g / t is calculated based on the mass of the original ore;

[0126] The lead selection III is blank selection;

[0127] A lead collector is added to the lead scavenging I to carry out lead scavenging I; the lead collector is ethyl xanthate, and the amount used is 50g / t, where g / t is calculated based on the mass of the original ore;

[0128] A lead collector is added to the lead scavenging II to carry out lead scavenging II; the lead collector is ethyl xanthate, and the dosage is 25g / t, where g / t is calculated based on the mass of the original ore;

[0129] S4. The lead tailings obtained in step S3 are subjected to roughing, scavenging and concentrating to obtain zinc concentrate and tailings.

[0130] Performing zinc roughing on the lead tailings obtained in step S3 to obtain zinc roughing concentrate and zinc roughing tailings;

[0131] The zinc rougher concentrate is subjected to three zinc concentrations. Zinc Concentration II uses the zinc concentrate 1 obtained from zinc concentration I as raw material, and zinc concentration III uses the zinc concentrate 2 obtained from zinc concentration II as raw material; the concentrate obtained from zinc concentration III is used as zinc concentrate; the tailings obtained from zinc concentration III are returned to the flotation of zinc concentration II; the tailings obtained from zinc concentration II are returned to the flotation of zinc concentration I; the tailings obtained from zinc concentration I are returned to the zinc rougher concentrate;

[0132] The zinc roughing tailings are subjected to two zinc scavengings. Zinc scavenging II uses zinc scavenging tailings 1 obtained from zinc scavenging I as raw material; zinc scavenging concentrate 1 obtained from zinc scavenging I is returned to the flotation of zinc roughing; zinc scavenging concentrate 2 obtained from zinc scavenging II is returned to the flotation of zinc scavenging I; and the tailings obtained from zinc scavenging II are used as the final tailings.

[0133] In the zinc roughing, a sulfur inhibitor, a zinc activator, a zinc collector and a foaming agent are sequentially added to carry out zinc roughing; wherein the foaming agent is pine oil, the addition amount is 30 g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, the addition amount is 2000 g / t, g / t is calculated based on the mass of the original ore; the zinc activator is copper sulfate, the addition amount is 500 g / t, g / t is calculated based on the mass of the original ore; the zinc collector is butyl xanthate, the addition amount is 120 g / t, g / t is calculated based on the mass of the original ore;

[0134] A sulfur inhibitor is added to the zinc concentration I to perform lead concentration I; the sulfur inhibitor is lime, and the amount used is 1000 g / t, where g / t is calculated based on the mass of the original ore;

[0135] A sulfur inhibitor is added to the zinc concentration II to carry out lead concentration II; the sulfur inhibitor is lime, and the amount used is 500g / t, where g / t is calculated based on the mass of the original ore;

[0136] The zinc concentration III is blank concentration;

[0137] A zinc collector is added to the zinc scavenging I to carry out lead scavenging I; the zinc collector is butyl xanthate, and the dosage is 60g / t, where g / t is calculated based on the mass of the original ore;

[0138] A zinc collector is added to the zinc scavenging II to carry out lead scavenging II; the zinc collector is butyl xanthate, and the dosage is 30g / t, where g / t is calculated based on the mass of the original ore;

[0139] The experimental results are shown in Table 7.

[0140] Table 7 Flotation test results / %

[0141]

[0142] Comparative Example 5

[0143] The other conditions were consistent with those in Example 3, except that the table flotation process for removing amorphous carbon in step S2 was not performed, and lead and zinc flotation recovery was directly carried out. The test results are shown in Table 8.

[0144] Table 8 Flotation test results / %

[0145]

[0146] Comparative Example 6

[0147] The other conditions are the same as those in Example 3, except that the carbon collector is only kerosene. The test results are shown in Table 9.

[0148] Table 9 Flotation test results / %

[0149]

[0150] In summary, it can be seen that it is difficult to effectively recover lead-zinc sulfide minerals by directly carrying out lead-zinc flotation recovery without removing amorphous carbon. At the same time, when only kerosene is used as a carbon collector, the lead and zinc recovery rates will also be affected to a certain extent. When a mixture of kerosene and lauryl alcohol polyether in a mass ratio of 16:4 to 19:1 is used as a carbon collector and amorphous carbon is removed by table flotation process, efficient flotation recovery of lead-zinc sulfide minerals can be achieved.

Claims

1. A combined gravity-flotation beneficiation method for carbon-containing lead-zinc sulfide ore, characterized in that: The steps include: S1. Crushing and grinding the raw ore to obtain grinding products; S2. Adding a carbon collector and a frother to the grinding product obtained in step S1, slurrying is performed, and then the slurry is transported to a table flotation table to obtain a table flotation table concentrate and carbon-containing tailings; S3. The flotation table concentrate obtained in step S2 is transferred to the flotation system, and the lead concentrate and lead tailings are obtained by roughing, scavenging and concentrating; S4. The lead tailings obtained in step S3 are subjected to roughing, scavenging and concentrating to obtain zinc concentrate and tailings.

2. The gravity-flotation combined beneficiation method for carbon-containing lead-zinc sulfide ore according to claim 1, characterized in that: In step S1, the -0.074 mm particle size accounts for 70% to 90% of the ground product.

3. The gravity-flotation combined beneficiation method of carbon-containing lead-zinc sulfide ore according to claim 1, characterized in that: In step S2, the carbon collector is a mixture of kerosene and lauryl alcohol polyether, wherein the mass ratio of kerosene to lauryl alcohol polyether is 16:4-19:1, and the addition amount is 10-30 g / t, where g / t is calculated based on the mass of the original ore; The foaming agent is at least one of pine oil and methyl isobutyl carbinol, and the added amount is 10-30 g / t, where g / t is calculated based on the mass of the original ore.

4. The gravity-flotation combined beneficiation method of carbon-containing lead-zinc sulfide ore according to claim 1, characterized in that: Step S3 includes one lead roughing selection, two lead sweeping selections and three lead cleaning selections, specifically: First, the table flotation table concentrate obtained in step S2 is subjected to lead roughing to obtain lead roughing concentrate and lead roughing tailings; The lead roughing concentrate is subjected to three lead concentrations. Lead concentration II uses the lead concentration concentrate 1 obtained from lead concentration I as raw material, and lead concentration III uses the lead concentration concentrate 2 obtained from lead concentration II as raw material; the concentrate obtained from lead concentration III is used as lead concentrate; the tailings obtained from lead concentration III are returned to the flotation of lead concentration II; the tailings obtained from lead concentration II are returned to the flotation of lead concentration I; the tailings obtained from lead concentration I are returned to the lead roughing concentrate; The lead roughing tailings are subjected to two lead scavengings. Lead scavenging II uses the lead scavenging tailings 1 obtained from lead scavenging I as raw material; the lead scavenging concentrate 1 obtained from lead scavenging I is returned to the flotation of the lead roughing; the lead scavenging concentrate 2 obtained from lead scavenging II is returned to the flotation of lead scavenging I; the tailings obtained from lead scavenging II are used as lead selection tailings.

5. The gravity-flotation combined beneficiation method of carbon-containing lead-zinc sulfide ore according to claim 4, characterized in that: In the lead roughing, sulfur inhibitor, zinc inhibitor, lead collector and foaming agent are sequentially added to carry out lead roughing; wherein the foaming agent is at least one of pine oil or methyl isobutyl carbinol, and the addition amount is 10-30 g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, and the addition amount is 1000-6000 g / t, g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the mass ratio of zinc sulfate to sodium sulfite is 2:1, the addition amount of zinc sulfate is 400-2000 g / t, and the addition amount of sodium sulfite is 200-1000 g / t, g / t is calculated based on the mass of the original ore; the lead collector is at least one of ethylthiocyanate, butylamine black medicine, and ethyl xanthate, and the addition amount of the lead collector is 50-100 g / t, g / t is calculated based on the mass of the original ore; A sulfur inhibitor and a zinc inhibitor are sequentially added to the lead concentration I to carry out lead concentration I; wherein the sulfur inhibitor is lime, and the amount used is 500-1500 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the mass ratio of zinc sulfate to sodium sulfite is 2:1, the amount of zinc sulfate added is 200-500 g / t, and the amount of sodium sulfite added is 100-250 g / t, where g / t is calculated based on the mass of the original ore; A sulfur inhibitor and a zinc inhibitor are sequentially added to the lead concentration II to carry out lead concentration II; wherein the sulfur inhibitor is lime, and the amount used is 250-750 g / t, where g / t is calculated based on the mass of the original ore; the zinc inhibitor is a combination of zinc sulfate and sodium sulfite, and the mass ratio of zinc sulfate to sodium sulfite is 2:1, the amount of zinc sulfate added is 100-250 g / t, and the amount of sodium sulfite added is 50-125 g / t, where g / t is calculated based on the mass of the original ore; The lead selection III is blank selection; A lead collector is added to the lead scavenging I to carry out lead scavenging I; the lead collector is at least one of ethylthiocyanate, butylamine black medicine, and ethyl xanthate, and the amount of the lead collector added is 25-50g / t, where g / t is calculated based on the mass of the original ore; A lead collector is added to the lead scavenging II to carry out lead scavenging II; the lead collector is at least one of ethylthiocyanate, butylamine black medicine, and ethyl xanthate, and the amount of the lead collector added is 10-25g / t, where g / t is calculated based on the mass of the original ore.

6. The gravity-flotation combined beneficiation method of carbon-containing lead-zinc sulfide ore according to claim 1, characterized in that: Step S4 includes one zinc roughing selection, two zinc sweeping selections and three zinc concentrating selections, specifically: Firstly, the lead tailings obtained in step S3 are subjected to zinc roughing to obtain zinc roughing concentrate and zinc roughing tailings; The zinc rougher concentrate is subjected to three zinc concentrations. Zinc Concentration II uses the zinc concentrate 1 obtained from zinc concentration I as raw material, and zinc concentration III uses the zinc concentrate 2 obtained from zinc concentration II as raw material; the concentrate obtained from zinc concentration III is used as zinc concentrate; the tailings obtained from zinc concentration 3 are returned to the flotation of zinc concentration II; the tailings obtained from zinc concentration II are returned to the flotation of zinc concentration I; the tailings obtained from zinc concentration I are returned to the zinc rougher concentrate; The zinc roughing tailings are subjected to two zinc scavengings. Zinc scavenging II uses zinc scavenging tailings 1 obtained from zinc scavenging I as raw material; zinc scavenging concentrate 1 obtained from zinc scavenging I is returned to the flotation of zinc roughing; zinc scavenging concentrate 2 obtained from zinc scavenging II is returned to the flotation of zinc scavenging I; and the tailings obtained from zinc scavenging II are used as the final tailings.

7. The gravity-flotation combined beneficiation method of carbon-containing lead-zinc sulfide ore according to claim 6, characterized in that: In the zinc roughing, a sulfur inhibitor, a zinc activator, a zinc collector and a foaming agent are sequentially added to carry out zinc roughing; wherein the foaming agent is at least one of pine oil or methyl isobutyl carbinol, and the addition amount is 10-30 g / t, g / t is calculated based on the mass of the original ore; the sulfur inhibitor is lime, and the addition amount is 500-2000 g / t, g / t is calculated based on the mass of the original ore; the zinc activator is copper sulfate, and the addition amount is 200-500 g / t, g / t is calculated based on the mass of the original ore; the zinc collector is at least one of butyl xanthate and ethyl thiocarbamate, and the addition amount of the zinc collector is 60-120 g / t, g / t is calculated based on the mass of the original ore; A sulfur inhibitor is added to the zinc concentration I to perform lead concentration I; the sulfur inhibitor is lime, and the amount used is 250-1000 g / t, where g / t is calculated based on the mass of the original ore; A sulfur inhibitor is added to the zinc concentration II to carry out lead concentration II; the sulfur inhibitor is lime, and the amount used is 100-500 g / t, where g / t is calculated based on the mass of the original ore; The zinc concentration III is blank concentration; A zinc collector is added to the zinc scavenging I to carry out lead scavenging I; the zinc collector is at least one of butyl xanthate and ethylthiocarbamate, and the amount of the zinc collector added is 30-60 g / t, where g / t is calculated based on the mass of the original ore; A zinc collector is added to the zinc scavenging II to carry out lead scavenging II; the zinc collector is at least one of butyl xanthate and ethylthiocarbamate, and the amount of the zinc collector added is 15-30 g / t, where g / t is calculated based on the mass of the original ore.

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