Beneficiation method for recovering silver, copper, lead, zinc, antimony and sulfur from complex silver-tin paragenic ore

Abstract

The invention belongs to the technical field of beneficiation recovery, and particularly relates to a beneficiation method for recovering silver, copper, lead, zinc, antimony and sulfur from complex silver-tin paragenic ore. The beneficiation method comprises the steps of raw ore grinding, flotation of silver, copper, lead, antimony, sulfur and the like, separation of silver, copper, lead, antimony and sulfur, separation of lead, antimony and sulfur, mixed flotation of zinc and sulfur, separation of zinc and sulfur and the like. According to the characteristics of the complex silver-tin paragenetic ore, efficient enrichment and separation of valuable minerals in the complex silver-tin paragenetic ore are achieved by utilizing floatability difference of sulfide minerals and step-by-step flotation enrichment, silver, copper, lead, antimony, zinc and sulfur resources in the complex silver-tin paragenetic ore are effectively recycled, and the beneficiation method is low in reagent dosage, good in separation effect and advanced in index.

Description

Technical Field

[0001] The present invention belongs to the technical field of ore dressing and recovery, and particularly relates to an ore dressing method for recovering silver, copper, lead, zinc, antimony and sulfur from complex silver-tin symbiotic ore. Background Art

[0002] As a precious metal, silver has long been used as hard currency in human society. Nowadays, with the rapid development of science and technology, silver metal is more widely used due to its excellent stability, electrical conductivity and other special properties. Therefore, the current demand for silver metal by people continues to rise. Due to its strong sulfurophilic property, silver mostly coexists with sulfide minerals in nature, thus forming complex polymetallic symbiotic ores such as silver-copper-lead-zinc-antimony-sulfur. In these complex symbiotic ores, the intergrowth and dissemination relationship of silver, copper, lead, zinc, antimony and sulfur minerals is complex, the dissemination size is extremely uneven, and the content of associated elements is low. For a long time, there has been a lack of ore dressing technologies that can effectively recover multiple metals therein, resulting in the loss of a large amount of precious silver, copper, lead, zinc and antimony resources.

[0003] At the present stage, the ore dressing technology for silver-tin symbiotic ore is usually: grinding and bulk flotation of sulfide ores to produce a bulk sulfide concentrate, and the sulfur flotation tailings are fed for cassiterite separation. The disadvantage is that the obtained bulk sulfide concentrate is affected by a large amount of sulfide reagents, resulting in poor separation effect, low grade of the obtained concentrate, and even inability to separate, with poor benefits.

[0004] The biggest characteristics of the associated copper, lead, zinc, antimony and sulfur in silver-tin symbiotic ore are that there are many types of valuable minerals but low content, the dissemination size of thick and thin is uneven, the grinding size of sulfide ores is restricted by the subsequent cassiterite ore dressing, and the sulfide ore dressing reagents have great interference on cassiterite separation. Therefore, it is necessary to develop a technology with reasonable process and economic feasibility for recovering silver, copper, lead, antimony and sulfur from silver-tin symbiotic ore, which puts forward high requirements for the combination of ore dressing processes and ore dressing reagents.

[0005] CN110404690A discloses a method for recovering independent silver minerals from silver-tin symbiotic ore. The research object is silver-tin symbiotic ore. First, the ore is ground to -15 mm by grinding, and then pre-screened by a high-frequency vibrating screen to obtain -0.2 mm raw ore and +0.2 mm raw ore. The +0.2 mm raw ore is returned to grinding, and so on, until -0.2 mm raw ore is obtained. The -0.2 mm raw ore is subjected to enhanced flotation of independent silver minerals to obtain silver concentrate and silver flotation tailings. The silver flotation tailings are fed into the subsequent cassiterite separation. This invention has the advantages of strong adaptability, extremely high grade of the obtained silver concentrate and high silver recovery rate, and is suitable for recovering silver, especially independent silver minerals, from silver-tin symbiotic ore. However, it does not give a method for recovering other types of complex metals.

[0006] Therefore, it is of great research significance and economic value to develop a method for recovering multiple metals, namely silver, copper, lead, zinc, antimony and sulfur, from complex silver-tin symbiotic ore. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that the prior art lacks a technical method for recovering silver, copper, lead, zinc, antimony and sulfur resources in silver-tin symbiotic ores, and provides a beneficiation method for recovering silver, copper, lead, zinc, antimony and sulfur from complex silver-tin symbiotic ores. The beneficiation method of the present invention can finally obtain silver-copper concentrate, lead-antimony concentrate, zinc concentrate, sulfur concentrate and sulfur-floating tailings, realizing the comprehensive recovery of associated silver, copper, lead, zinc, antimony and sulfur resources in silver-tin symbiotic ores, creating favorable conditions for the subsequent separation of cassiterite, and having the advantages of short process, low reagent consumption and advanced technical and economic indexes.

[0008] To achieve the above object, the present invention provides a beneficiation method for recovering silver, copper, lead, zinc, antimony and sulfur from complex silver-tin symbiotic ores, comprising the following steps:

[0009] A beneficiation method for recovering silver, copper, lead, zinc, antimony and sulfur from complex silver-tin symbiotic ores, comprising the following steps:

[0010] S1. Grinding the complex silver-tin symbiotic ore to obtain raw ore;

[0011] S2. Flotation of silver, copper, lead, antimony and sulfur: Adding an inhibitor and a collector to the raw ore in step S1 for flotation of silver, copper, lead, antimony and sulfur to obtain a silver-copper-lead-antimony-sulfur mixed concentrate and an isoflotation tailing;

[0012] S3. Flotation separation of silver and copper from lead, antimony and sulfur: Grinding the silver-copper-lead-antimony-sulfur mixed concentrate in step S2, and then adding an inhibitor and a collector for flotation to obtain a silver-copper concentrate and a lead-antimony-sulfur mixed concentrate;

[0013] S4. Flotation separation of lead and antimony from sulfur: Adding an inhibitor, a collector and a foaming agent to the lead-antimony-sulfur mixed concentrate in step S3 for flotation to obtain a lead-antimony concentrate and a sulfur concentrate 1;

[0014] S5. Bulk flotation of zinc and sulfur: Adding an activator, a collector and a foaming agent to the isoflotation tailing in step S2 for bulk flotation of zinc and sulfur to obtain a zinc-sulfur mixed concentrate and a sulfur-floating tailing;

[0015] S6. Separating zinc from sulfur: Adding an inhibitor to the zinc-sulfur mixed concentrate in step S5, grinding, and then adding an activator and a collector for zinc-sulfur separation to obtain a zinc concentrate and a sulfur concentrate 2.

[0016] The beneficiation method for recovering silver, copper, lead, zinc, antimony and sulfur from complex silver-tin symbiotic ores provided by the present invention fully combines the special properties of silver, copper, lead, zinc, antimony and sulfur in silver-tin symbiotic ores and the needs of cassiterite separation, realizing the cascade utilization of unevenly disseminated coarse and fine-grained ores. Due to the large difference in flotability of different minerals in complex ores, the present invention ensures the full recovery of high-value silver, copper, lead and antimony through the flotation of silver, copper, lead, antimony and sulfur, and then strengthens the removal of zinc and sulfur minerals. While ensuring good separation of silver, copper, lead, antimony, zinc and sulfur and efficient desulfurization, it is ensured that lime is not introduced into the main process, avoiding serious interference with the subsequent separation of cassiterite.

[0017] Preferably, the Ag grade of the complex silver-tin symbiotic ore described in step S1 is 88.3 g / t to 163.6 g / t, the Cu grade is 0.21% to 0.42%, the Pb grade is 0.30% to 0.40%, the Zn grade is 0.96% to 1.76%, the Sb grade is 0.20% to 0.31%, and the S grade is 3.44% to 7.43%.

[0018] Preferably, step S2 is to add 1000 g / t to 3000 g / t of inhibitor to the raw ore described in step S1, stir, then add 60 g / t to 120 g / t of collector, stir, conduct rough selection, then add 20 g / t to 30 g / t of collector for one scavenging, add 8 g / t to 20 g / t of collector for two scavengings, and then add 40 g / t to 400 g / t of inhibitor for two to three cleanings to obtain a silver-copper-lead-antimony-sulfur mixed concentrate and an equal-float tailings; the preferred beneficiation process of the present invention can reduce the addition amount of collectors and inhibitors through rough grinding for feeding and step-by-step and sectional flotation methods, avoiding excessive adsorption of minerals on the surface caused by excessive reagents and preventing impurities from mixing into the concentrate, thereby reducing the product grade.

[0019] Preferably, the collector described in step S2 is any one or a combination of two of dibutyl dithiophosphate, Z200, ethyl xanthate, and ethyl dixanthogen;

[0020] Preferably, the inhibitor described in step S2 is any two or three combinations of sodium carbonate, zinc sulfate, sodium sulfite, and water glass. The preferred combined reagents of the present invention can fully promote mineral separation, strengthen the effect of mineral collection, and in combination with the above beneficiation process, further reduce the dosage of reagents. The preferred inhibitor or collector of the present invention can meet the beneficiation requirements of different complex silver-tin symbiotic ores through synergistic effects. For example, in Examples 1-4 of the specific implementation mode, a silver-tin symbiotic ore containing copper, lead, zinc, and antimony in Inner Mongolia, a silver-tin symbiotic ore containing copper, lead, zinc, and antimony in Yunnan, a silver-tin symbiotic ore containing copper, lead, zinc, and antimony in Hunan, and a silver-tin symbiotic ore containing copper, lead, zinc, and antimony in Guangxi respectively adopted the inhibitors and collectors described in this application and obtained good beneficiation effects.

[0021] Preferably, by mass percentage, the grinding in step S1 is to grind the complex silver-tin symbiotic ore described in step S1 into ore particles with a particle size of 0.2 mm to 0.3 mm; the grinding in step S3 is to grind the silver-copper-lead-antimony-sulfur mixed concentrate described in step S2 so that 70%-80% of the ore particle size is not greater than 0.043 mm; the grinding in step S6 is to add an inhibitor to the zinc-sulfur mixed concentrate described in step S5 and grind it so that 70%-75% of the ore particle size is not greater than 0.043 mm.

[0022] The process provided by the present invention is applicable to the treatment of ores with relatively coarse dissemination sizes, which can fully avoid over-grinding of high-value cassiterite, retain the natural surface properties of minerals, reduce oxidation or slime formation caused by excessive grinding, improve flotation selectivity, and also reduce grinding time and energy consumption, and reduce equipment wear, etc. Under the rough grinding conditions of the present invention, over-grinding of minerals can be effectively avoided, and fine particle sizes are not generated, providing a basis for effectively separating minerals through step-by-step flotation next.

[0023] Preferably, step S3 is to grind the silver-copper-lead-antimony-sulfur mixed concentrate described in step S2, add 100 g / t to 300 g / t of inhibitor, stir, then add 1 g / t to 3 g / t of collector, stir, conduct rough selection, then add 0.2 g / t to 0.5 g / t of collector, conduct one scavenging, then add 0.1 g / t to 0.3 g / t of collector, conduct two scavengings, then add 20 g / t to 60 g / t of inhibitor, and conduct two to three cleanings to obtain silver-copper concentrate and lead-antimony-sulfur mixed concentrate;

[0024] Preferably, the inhibitor in step S3 is any one or a combination of two of sodium sulfite and sodium thiosulfate;

[0025] Preferably, the collector in step S3 is any one of No. 25 black medicine and No. 15 black medicine.

[0026] Preferably, step S4 is to add 100 g / t to 300 g / t of inhibitor to the lead-antimony-sulfur mixed concentrate described in step S3, stir, then add 2 g / t to 6 g / t of collector, stir, then add 0.5 g / t to 1 g / t of foaming agent, conduct rough selection, then add 0.5 g / t to 1 g / t of collector, conduct one scavenging, then add 0.2 g / t to 0.4 g / t of collector, conduct two scavengings, then add 20 g / t to 60 g / t of inhibitor, and conduct two to three cleanings to obtain lead-antimony concentrate and sulfur concentrate 1;

[0027] Preferably, the inhibitor in step S4 is any one or a combination of two of lime and sodium humate;

[0028] Preferably, the inhibitor in step S4 is a composition of lime and sodium humate with a mass ratio of 10:1;

[0029] The present invention provides a composition of lime and sodium humate with a mass ratio of 10:1 for ore types that cannot use only a small amount of lime as an inhibitor, which can achieve a better inhibitor effect without increasing the amount of lime, and avoids disrupting the separation sequence by simultaneously inhibiting multiple minerals.

[0030] Preferably, the collector in step S4 is any one of ethyl thionocarbamate and ethyl thionocarbamate acrylonitrile ester;

[0031] Preferably, the foaming agent described in step S4 is methyl isobutyl carbinol.

[0032] Preferably, step S5 is to add 80 g / t - 600 g / t of activator to the bulk flotation tailings described in step S2, stir, then add 80 g / t - 120 g / t of collector, stir, then add 10 g / t - 20 g / t of foaming agent, conduct rough selection, then add 10 g / t - 20 g / t of collector, conduct first scavenging, then add 10 g / t - 20 g / t of collector, conduct second scavenging, and then conduct second to third cleaning to obtain zinc-sulfur mixed concentrate and sulfur flotation tailings;

[0033] Preferably, the activator described in step S5 is one or a combination of two of copper sulfate and oxalic acid;

[0034] Preferably, the collector described in step S5 is any one or a combination of two of butyl xanthate, ethyl xanthate, and Z200;

[0035] Preferably, the foaming agent described in step S5 is pine oil or methyl isobutyl carbinol.

[0036] Preferably, step S6 is to add 200 g / t - 600 g / t of inhibitor to the zinc-sulfur mixed concentrate described in step S5, then grind, then add 5 g / t - 10 g / t of activator, stir, then add 2 g / t - 4 g / t of collector, stir, conduct rough selection, then add 0.5 g / t - 1 g / t of collector, conduct first scavenging, then add 0.2 g / t - 0.4 g / t of collector, conduct second scavenging, and then add 40 g / t - 100 g / t of inhibitor, conduct third to fourth cleaning to obtain zinc concentrate and sulfur concentrate 2;

[0037] Preferably, the activator described in step S6 is copper sulfate;

[0038] Preferably, the inhibitor described in step S6 is any one or a combination of two of lime and sodium humate;

[0039] Preferably, the inhibitor described in step S6 is a composition of lime and sodium humate with a mass ratio of 10:1;

[0040] The composition of lime and sodium humate with a mass ratio of 10:1 preferably used in the present invention is designed for complex silver-tin symbiotic ores that cannot use only lime. When using this ore dressing method of the present invention for such ores, using only lime will result in a large dosage of drugs. The composition of lime and sodium humate with a mass ratio of 10:1 provided by the present invention can achieve a better inhibitor effect without increasing the dosage of lime, avoiding the reduction of concentrate grade caused by excessive drug dosage.

[0041] Preferably, the collector described in step S6 is any one or a combination of two of ethyl xanthate and butyl xanthate.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) Combining with the special properties of silver, copper, lead, zinc, antimony and sulfur in the silver-tin symbiotic ore and the requirements of cassiterite separation, the beneficiation method of the present invention divides the process into: flotability of silver, copper, lead, antimony and sulfur, separation of silver and copper from lead, antimony and sulfur, separation of lead and antimony from sulfur, bulk flotation of zinc and sulfur, separation of zinc and sulfur, and cascade utilization of unevenly disseminated coarse and fine-grained ores, achieving the purpose of efficient mutual separation of silver, copper, lead, zinc, antimony and sulfur, fully ensuring the recovery of high-value silver, copper, lead and antimony, and then strengthening the removal of zinc and sulfur minerals. While ensuring good separation of silver, copper, lead, antimony, zinc and sulfur and efficient desulfurization, the main process does not introduce lime, avoiding serious interference with subsequent cassiterite separation, and realizing the resource recovery of silver, copper, lead, zinc, antimony and sulfur in the silver-tin symbiotic ore.

[0044] (2) Combining with the special properties of silver, copper, lead, zinc, antimony and sulfur in the silver-tin symbiotic ore and the requirements of cassiterite separation, the beneficiation method of the present invention adopts rough grinding for feeding, avoiding over-grinding of high-value cassiterite and facilitating the improvement of the recovery rate of cassiterite separation.

[0045] (3) The present invention obtains silver-copper concentrate, lead-antimony concentrate, zinc concentrate and sulfur concentrate with relatively high grades and high recovery rates. The beneficiation method of the present invention recovers a variety of concentrate products from complex silver-tin symbiotic ores, such as silver-copper concentrate, lead-antimony concentrate, zinc concentrate and sulfur concentrate, etc. The indexes are significantly improved, promoting the efficient recovery of silver, copper, lead, zinc, antimony and sulfur in the silver-tin symbiotic ore, and at the same time creating good conditions for subsequent cassiterite separation.

[0046] (4) The collector and inhibitor combination provided by the present invention can fully address the problem of poor flotability of ores containing the same metal but with uneven contents, ensuring the recovery efficiency of silver, copper, lead, zinc, antimony and sulfur. At the same time, in cooperation with the beneficiation process, the use of reagents is further reduced, avoiding the adverse effects of a large amount of reagents on beneficiation, and eliminating the reagent removal step.

[0047] (5) The whole process flow of the beneficiation method of the present invention is compact, which is conducive to industrialization. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a beneficiation flow chart for recovering silver, copper, lead, zinc, antimony and sulfur from complex silver-tin symbiotic ores. DETAILED DESCRIPTION OF THE INVENTION

[0049] The present invention will be further described below in conjunction with embodiments. It should be noted that the following embodiments are only used to explain the present invention, rather than to limit the present invention. The experimental methods used in the following embodiments are all conventional methods without special instructions. The materials, reagents, etc. used in the following embodiments can be obtained through commercial channels without special instructions. Unless otherwise specified, the percentages mentioned in the present invention are all mass percentages.

[0050] Any non-substantial changes and substitutions made by those skilled in the art based on the present invention fall within the scope of protection required by the present invention.

[0051] Example 1

[0052] A beneficiation method for recovering silver, copper, lead, zinc, antimony and sulfur from a complex silver-tin symbiotic ore, comprising the following steps:

[0053] S1. Grinding and screening the complex silver-tin symbiotic ore to obtain raw ore with a particle size of the ore grains less than or equal to -0.3 mm;

[0054] S2. Adding an inhibitor to the obtained raw ore, stirring for 2.5 minutes, then adding a collector, stirring for 2.5 minutes, performing rough selection, then respectively adding a collector for scavenging 1 and scavenging 2, and then respectively adding an inhibitor for cleaning 1, cleaning 2 and cleaning 3 to obtain a silver, copper, lead, antimony and sulfur mixed concentrate and an equal-floating tailing;

[0055] S3. Grinding the silver, copper, lead, antimony and sulfur mixed concentrate to 80% with a particle size less than or equal to -0.043 mm; adding an inhibitor, stirring for 2.5 minutes, then adding a collector, stirring for 2.5 minutes, performing rough selection, then respectively adding a collector for scavenging 1 and scavenging 2, and then respectively adding an inhibitor for cleaning 1, cleaning 2 and cleaning 3 to obtain a silver and copper concentrate and a lead, antimony and sulfur mixed concentrate;

[0056] S4. Adding an inhibitor to the lead, antimony and sulfur mixed concentrate, stirring for 2.5 minutes, then adding a collector, stirring for 2.5 minutes, adding a foaming agent, performing rough selection, then respectively adding a collector for scavenging 1 and scavenging 2, and then respectively adding an inhibitor for cleaning 1, cleaning 2 and cleaning 3 to obtain a lead and antimony concentrate and a sulfur concentrate 1;

[0057] S5. Adding an activator to the equal-floating tailing, stirring for 2.5 minutes, then adding a collector, stirring for 2.5 minutes, adding a foaming agent, performing rough selection, then respectively adding a collector for scavenging 1 and scavenging 2, and performing secondary cleaning to obtain a zinc and sulfur mixed concentrate and a floating sulfur tailing;

[0058] S6. Adding an inhibitor to the zinc and sulfur mixed concentrate and grinding it to 70% of the zinc and sulfur mixed concentrate with a particle size less than or equal to -0.043 mm; adding an activator, stirring for 2.5 minutes, adding a collector, stirring for 2.5 minutes, performing rough selection, then respectively adding a collector for scavenging 1 and scavenging 2, and then respectively adding an inhibitor for cleaning 1, cleaning 2 and cleaning 3 to obtain a zinc concentrate and a sulfur concentrate 2.

[0059] The specific usage of the beneficiation agents is shown in Table 1, and the complex silver-tin symbiotic ore is a silver-tin symbiotic ore containing copper, lead, zinc and antimony in a certain place in Inner Mongolia.

[0060] Example 2

[0061] S1. Grind and screen the complex silver-tin symbiotic ore to obtain raw ore with a particle size of less than or equal to -0.25 mm;

[0062] S2. Add an inhibitor to the raw ore, stir for 2 minutes, then add a collector, stir for 2 minutes, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, and then add the inhibitor separately for cleaning 1, cleaning 2, and cleaning 3 to obtain a silver-copper-lead-antimony-sulfur mixed concentrate and an equal-float tailings;

[0063] S3. Grind the silver-copper-lead-antimony-sulfur mixed concentrate to 70% with a particle size of less than or equal to -0.043 mm; add an inhibitor, stir for 2 minutes, then add a collector, stir for 2 minutes, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, and then add the inhibitor separately for cleaning 1, cleaning 2, and cleaning 3 to obtain a silver-copper concentrate and a lead-antimony-sulfur mixed concentrate;

[0064] S4. Add an inhibitor to the lead-antimony-sulfur mixed concentrate, stir for 2 minutes, then add a collector, stir for 2 minutes, add a frother, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, add the inhibitor separately for cleaning 1, cleaning 2, and cleaning 3 to obtain a lead-antimony concentrate and a sulfur concentrate 1;

[0065] S5. Add an activator to the equal-float tailings, stir for 2 minutes, then add a collector, stir for 2 minutes, add a frother, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, and then conduct secondary cleaning to obtain a zinc-sulfur mixed concentrate and a floating sulfur tailings;

[0066] S6. Add an inhibitor to the zinc-sulfur mixed concentrate and grind it to 75% of the zinc-sulfur mixed concentrate with a particle size of less than or equal to -0.043 mm; add an activator, stir for 2 minutes, add a collector, stir for 2 minutes, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, and then add the inhibitor separately for cleaning 1, cleaning 2, and cleaning 3 to obtain a zinc concentrate and a sulfur concentrate 2.

[0067] The specific reagent usage for separation is shown in Table 1. The complex silver-tin symbiotic ore is a silver-tin symbiotic ore containing copper, lead, zinc, and antimony in a certain place in Yunnan. The specific index situation is shown in Table 5.

[0068] Example 3

[0069] A beneficiation method for recovering silver, copper, lead, antimony, and sulfur from silver-tin symbiotic ore, comprising the following steps:

[0070] S1. Grind and screen the complex silver-tin symbiotic ore to obtain raw ore with a particle size of less than or equal to -0.2 mm;

[0071] S2. Add an inhibitor to the raw ore, stir for 3 minutes, then add a collector, stir for 3 minutes, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, then add the inhibitor separately for cleaning 1 and cleaning 2 to obtain a silver-copper-lead-antimony-sulfur mixed concentrate and an equal-float tailing;

[0072] S3. Grind the silver-copper-lead-antimony-sulfur mixed concentrate until 75% of the ore particle size is less than or equal to -0.043 mm; add an inhibitor, stir for 3 minutes, then add a collector, stir for 3 minutes, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, then add the inhibitor separately for cleaning 1, cleaning 2 and cleaning 3 to obtain a silver-copper concentrate and a lead-antimony-sulfur mixed concentrate;

[0073] S4. Add an inhibitor to the lead-antimony-sulfur mixed concentrate, stir for 3 minutes, then add a collector, stir for 3 minutes, add a frother, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, then add the inhibitor separately for cleaning 1, cleaning 2 and cleaning 3 to obtain a lead-antimony concentrate and a sulfur concentrate 1;

[0074] S5. Add an activator to the equal-float tailing, stir for 3 minutes, then add a collector, stir for 3 minutes, add a frother, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, and conduct cleaning 1, cleaning 2 and cleaning 3 to obtain a zinc-sulfur mixed concentrate and a floating sulfur tailing;

[0075] S6. Add an inhibitor to the zinc-sulfur mixed concentrate and grind it until 70% of the zinc-sulfur mixed concentrate has an ore particle size less than or equal to -0.043 mm; add an activator, stir for 3 minutes, add a collector, stir for 3 minutes, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, add an inhibitor, and conduct cleaning 1, cleaning 2, cleaning 3 and cleaning 4 to obtain a zinc concentrate and a sulfur concentrate 2.

[0076] The specific reagent usage in the separation is shown in Table 2. The complex silver-tin symbiotic ore is a silver-tin symbiotic ore containing copper, lead, zinc and antimony in a certain place in Hunan. The specific index situation is shown in Table 5.

[0077] Example 4

[0078] A beneficiation method for recovering silver, copper, lead, antimony and sulfur from a silver-tin symbiotic ore, comprising the following steps:

[0079] S1. Grind and screen the complex silver-tin symbiotic ore to obtain a raw ore with an ore particle size less than or equal to -0.25 mm;

[0080] S2. Add an inhibitor to the raw ore, stir for 3 minutes, then add a collector, stir for 2 minutes, conduct rough selection, then add the collector separately for scavenging 1 and scavenging 2, then add the inhibitor separately for cleaning 1 and cleaning 2 to obtain a silver-copper-lead-antimony-sulfur mixed concentrate and an equal-float tailing;

[0081] S3. Grind the silver-copper-lead-antimony-sulfur mixed concentrate to 80% with the particle size of the ore particles less than or equal to -0.043 mm; add an inhibitor and stir for 3 minutes, then add a collector and stir for 3 minutes, conduct rough selection, then add the collector respectively for scavenging 1 and scavenging 2, then add the inhibitor respectively for cleaning 1, cleaning 2 and cleaning 3 to obtain silver-copper concentrate and lead-antimony-sulfur mixed concentrate;

[0082] S4. Add an inhibitor to the lead-antimony-sulfur mixed concentrate and stir for 3 minutes, then add a collector and stir for 3 minutes, add a frother, conduct rough selection, then add the collector respectively for scavenging 1 and scavenging 2, then add the inhibitor respectively for cleaning 1, cleaning 2 and cleaning 3 to obtain lead-antimony concentrate and sulfur concentrate 1;

[0083] S5. Add an activator to the equal-floatation tailings and stir for 3 minutes, then add a collector and stir for 3 minutes, add a frother, conduct rough selection, then add the collector respectively for scavenging 1 and scavenging 2, then conduct cleaning 1, cleaning 2 and cleaning 3 to obtain zinc-sulfur mixed concentrate and floating sulfur tailings;

[0084] S6. Add an inhibitor to the zinc-sulfur mixed concentrate and grind it so that 75% of the zinc-sulfur mixed concentrate has a particle size less than or equal to -0.043 mm; add an activator and stir for 3 minutes, add a collector and stir for 3 minutes, conduct rough selection, then add the collector respectively for scavenging 1 and scavenging 2, add an inhibitor, conduct cleaning 1, cleaning 2, cleaning 3 and cleaning 4 to obtain zinc concentrate and sulfur concentrate 2.

[0085] The specific reagent usage for separation is shown in Table 2. The complex silver-tin symbiotic ore is a silver-tin symbiotic ore containing copper, lead, zinc and antimony in a certain place in Guangxi, and the specific index situation is shown in Table 5.

[0086] Comparative Example 1

[0087] The conventional beneficiation method for the silver-tin symbiotic ore containing copper, lead, zinc, antimony and sulfur is the same as the feed ore in Example 1, and the difference from Example 1 lies in different beneficiation processes and different reagents used.

[0088] It includes the following steps:

[0089] S1. Grind the complex silver-tin symbiotic ore to a particle size less than or equal to -0.3 mm;

[0090] S2. Silver-copper-lead-zinc-antimony-sulfur bulk flotation: Add an inhibitor to the ground product, stir for 3 minutes, then add a collector and stir for 2 minutes, then add a frother and stir for 2 minutes, conduct rough selection, add the collector respectively for scavenging 1 and scavenging 2, and then conduct cleaning 1, cleaning 2 and cleaning 3 to obtain silver-copper-lead-zinc-antimony-sulfur mixed concentrate and floating sulfur tailings;

[0091] S3 adds activated carbon to the silver-copper-lead-zinc-antimony-sulfur mixed concentrate for de-dosing;

[0092] S4 grinds the de-dosed silver-copper-lead-zinc-antimony-sulfur mixed concentrate until the particle size of the ore particles is less than or equal to -0.043 mm and accounts for 82%;

[0093] S5. Flotation separation of silver-copper-lead-antimony and zinc-sulfur: Add inhibitors to the ground silver-copper-lead-zinc-antimony-sulfur mixed concentrate for scavenging 1 and scavenging 2 respectively, and then add collectors for cleaning 1, cleaning 2 and cleaning 3 respectively to obtain silver-copper-lead-antimony concentrate and zinc-sulfur mixed concentrate;

[0094] S6. Zinc-sulfur separation: Add inhibitors, activators and collectors to the zinc-sulfur mixed concentrate for zinc-sulfur separation to obtain zinc concentrate and sulfur concentrate.

[0095] The complex silver-tin symbiotic ore is the same as that in Example 1. The specific reagent usage in the separation is shown in Table 3, and the specific indexes are shown in Table 6.

[0096] Comparative Example 2

[0097] The conventional beneficiation method for the silver-tin symbiotic ore containing copper-lead-zinc-antimony-sulfur is the same as the feed ore in Example 2, and the difference from Example 1 lies in the different beneficiation processes and the different reagents used.

[0098] It includes the following steps:

[0099] S1. Grind the complex silver-tin symbiotic ore until the particle size of the ore particles is less than or equal to -0.25 mm;

[0100] S2. Silver-copper-lead-zinc-antimony-sulfur bulk flotation:

[0101] Add inhibitors to the ground product, stir for 3 minutes, then add collectors, stir for 2 minutes, then add frothers and stir for 2 minutes for roughing, add collectors respectively for scavenging 1 and scavenging 2, and then carry out cleaning 1, cleaning 2 and cleaning 3 to obtain silver-copper-lead-zinc-antimony-sulfur mixed concentrate and sulfur flotation tailings;

[0102] Add inhibitors, collectors and frothers to the ground product for silver-copper-lead-zinc-antimony-sulfur bulk flotation to obtain silver-copper-lead-zinc-antimony-sulfur mixed concentrate and sulfur flotation tailings;

[0103] S3 adds activated carbon to the silver-copper-lead-zinc-antimony-sulfur mixed concentrate for de-dosing;

[0104] S4 grinds the de-dosed silver-copper-lead-zinc-antimony-sulfur mixed concentrate until the particle size of the ore particles is less than or equal to -0.043 mm and accounts for 78%;

[0105] S5. Flotation separation of silver-copper-lead-antimony and zinc-sulfur: Add inhibitors and collectors to the ground silver-copper-lead-zinc-antimony-sulfur mixed concentrate for flotation to obtain silver-copper-lead-antimony concentrate and zinc-sulfur mixed concentrate;

[0106] S6. Zinc-sulfur separation: Add inhibitors, activators, and collectors to the zinc-sulfur mixed concentrate for zinc-sulfur separation to obtain zinc concentrate and sulfur concentrate.

[0107] The complex silver-tin symbiotic ore is the same as that in Example 2. The specific reagent usage for separation is shown in Table 3, and the specific indexes are shown in Table 6.

[0108] Comparative Example 3

[0109] The conventional beneficiation method for the silver-tin symbiotic ore containing copper, lead, zinc, antimony, and sulfur has the same feed as that in Example 3 and is different from that in Example 1 in terms of beneficiation process and reagents used.

[0110] It includes the following steps:

[0111] S1. Grind the complex silver-tin symbiotic ore to a particle size less than or equal to -0.2 mm.

[0112] S2. Bulk flotation of silver, copper, lead, zinc, antimony, and sulfur: Add inhibitors, collectors, and frothers to the ground product for bulk flotation of silver, copper, lead, zinc, antimony, and sulfur to obtain a bulk concentrate of silver, copper, lead, zinc, antimony, and sulfur and sulfur flotation tailings.

[0113] S3. Add activated carbon to the bulk concentrate of silver, copper, lead, zinc, antimony, and sulfur for drug removal.

[0114] S4. Grind the drug-removed bulk concentrate of silver, copper, lead, zinc, antimony, and sulfur to a particle size such that 82% is less than or equal to -0.043 mm.

[0115] S5. Flotation separation of silver, copper, lead, and antimony from zinc and sulfur: Add inhibitors and collectors to the ground bulk concentrate of silver, copper, lead, zinc, antimony, and sulfur for flotation to obtain a concentrate of silver, copper, lead, and antimony and a zinc-sulfur mixed concentrate.

[0116] S6. Zinc-sulfur separation: Add inhibitors, activators, and collectors to the zinc-sulfur mixed concentrate for zinc-sulfur separation to obtain zinc concentrate and sulfur concentrate.

[0117] The complex silver-tin symbiotic ore is the same as that in Example 3. The specific reagent usage for separation is shown in Table 4, and the specific indexes are shown in Table 6.

[0118] Comparative Example 4

[0119] The conventional beneficiation method for the silver-tin symbiotic ore containing copper, lead, zinc, antimony, and sulfur has the same feed as that in Example 4 and is different from that in Example 1 in terms of beneficiation process and reagents used.

[0120] It includes the following steps:

[0121] S1. Grind the complex silver-tin symbiotic ore to a particle size less than or equal to -0.25 mm.

[0122] S2. Silver-Copper-Lead-Zinc-Antimony-Sulfur Bulk Flotation: Add inhibitors, collectors, and frothers to the products after grinding for silver-copper-lead-zinc-antimony-sulfur bulk flotation to obtain silver-copper-lead-zinc-antimony-sulfur bulk concentrate and sulfur flotation tailings;

[0123] S3. Add activated carbon to the silver-copper-lead-zinc-antimony-sulfur bulk concentrate for drug removal;

[0124] S4. Grind the silver-copper-lead-zinc-antimony-sulfur bulk concentrate after drug removal to a particle size where particles less than or equal to -0.043 mm account for 75%;

[0125] S5. Silver-Copper-Lead-Antimony and Zinc-Sulfur Flotation Separation: Add inhibitors and collectors to the silver-copper-lead-zinc-antimony-sulfur bulk concentrate after grinding for flotation to obtain silver-copper-lead-antimony concentrate and zinc-sulfur bulk concentrate;

[0126] S6. Zinc-Sulfur Separation: Add inhibitors, activators, and collectors to the zinc-sulfur bulk concentrate for zinc-sulfur separation to obtain zinc concentrate and sulfur concentrate.

[0127] The complex silver-tin symbiotic ore is the same as in Example 4. The specific reagent usage in beneficiation is shown in Table 4, and the specific indicators are shown in Table 6.

[0128] Table 1 Reagent Usage Table for the Beneficiation Methods of Examples 1 - 2

[0129]

[0130]

[0131]

[0132] Table 2 Reagent Usage Table for the Beneficiation Methods of Examples 3 - 4

[0133]

[0134]

[0135] Table 3 Reagent Usage Table for the Beneficiation Methods of Comparative Examples 1 - 2

[0136]

[0137]

[0138] Table 4 Reagent Usage Table for the Beneficiation Methods of Comparative Examples 3 - 4

[0139]

[0140]

[0141]

[0142] Table 5 Separation Results of Examples 1 - 4

[0143]

[0144] Continued Table 5 Separation Results of Examples 1 - 4

[0145]

[0146]

[0147] Table 6 Separation Results of Each Comparative Example (%)

[0148]

[0149] As can be seen from the above examples, compared with the prior art, the recovery method of the present invention can recover valuable elements such as silver, copper, lead, zinc, antimony, and sulfur from the silver - tin symbiotic ore containing copper, lead, zinc, antimony, and sulfur well.

[0150] Specifically, for the silver - copper concentrate in Example 1, the Ag grade is 8287.9 g / t, the Ag recovery rate reaches 83.21%, the Cu grade is 18.91%, the Cu recovery rate is 78.11%, for the lead - antimony concentrate, the Pb grade is 19.19%, the Pb recovery rate is 58.40%, the Sb grade is 12.97%, the Sb recovery rate is 58.68%, for the zinc concentrate, the Zn grade is 41.69%, the Zn recovery rate is 70.55%, for the first sulfur concentrate, the S grade is 41.67%, the S recovery rate is 27.54%, for the second sulfur concentrate, the S grade is 43.59%, the S recovery rate is 41.90%, and the total S recovery rate is 69.44%;

[0151] For the silver - copper concentrate in Example 2, the Ag grade is 9465.7 g / t, the Ag recovery rate can reach 82.04%, the Cu grade is 16.89%, the Cu recovery rate is 70.59%, for the lead - antimony concentrate, the Pb grade is 18.67%, the Pb recovery rate is 66.52%, the Sb grade is 11.83%, the Sb recovery rate is 64.83%, for the zinc concentrate, the Zn grade is 40.91%, the Zn recovery rate is 68.62%, for the first sulfur concentrate, the S grade is 39.16%, the S recovery rate is 27.35%, for the second sulfur concentrate, the S grade is 42.81%, the S recovery rate is 41.23%, and the total S recovery rate is 68.58%;

[0152] The Ag grade of the silver-copper concentrate in Example 3 is 7,264.8 g / t, the Ag recovery rate can reach 83.05%, the Cu grade is 18.12%, the Cu recovery rate is 80.23%, the Pb grade of the lead-antimony concentrate is 20.61%, the Pb recovery rate is 60.77%, the Sb grade is 13.26%, the Sb recovery rate is 56.41%, the Zn grade of the zinc concentrate is 45.12%, the Zn recovery rate is 77.24%, the S grade of the first sulfur concentrate is 42.58%, the S recovery rate is 36.06%, the S grade of the second sulfur concentrate is 45.91%, the S recovery rate is 36.59%, and the total S recovery rate is 72.65%.

[0153] The Ag grade of the silver-copper concentrate in Example 4 is 10,243.5 g / t, the Ag recovery rate can reach 80.01%, the Cu grade is 20.91%, the Cu recovery rate is 70.08%, the Pb grade of the lead-antimony concentrate is 18.59%, the Pb recovery rate is 69.31%, the Sb grade is 12.19%, the Sb recovery rate is 65.21%, the Zn grade of the zinc concentrate is 42.86%, the Zn recovery rate is 73.87%, the S grade of the first sulfur concentrate is 40.27%, the S recovery rate is 25.28%, the S grade of the second sulfur concentrate is 39.61%, the S recovery rate is 36.26%, and the total S recovery rate is 61.54%.

[0154] The existing beneficiation technology for silver-tin symbiotic ore containing copper, lead, zinc, antimony and sulfur is: bulk flotation of sulfide ores - depressant removal from bulk concentrate - separation of silver, copper, lead and antimony from zinc and sulfur - separation of zinc and sulfur. Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 use the existing technology to process the raw ores of Example 1, Example 2, Example 3 and Example 4, and the specific corresponding test indexes obtained are as follows:

[0155] The Ag grade of the silver-copper-lead-antimony concentrate in Comparative Example 1 is 4,186.2 g / t, the Ag recovery rate is 79.38%, the Cu grade is 9.67%, the Cu recovery rate is 73.92%, the Pb grade is 6.16%, the Pb recovery rate is 51.30%, the Sb grade is 4.02%, the Sb recovery rate is 49.26%, the Zn grade of the zinc concentrate is 33.29%, the Zn recovery rate is 62.42%, the S grade of the sulfur concentrate is 42.16%, and the S recovery rate is 63.88%.

[0156] The Ag grade of the silver-copper-lead-antimony concentrate in Comparative Example 2 is 3,512.5 g / t, the Ag recovery rate is 73.82%, the Cu grade is 6.03%, the Cu recovery rate is 58.14%, the Pb grade is 9.29%, the Pb recovery rate is 51.21%, the Sb grade is 5.58%, the Sb recovery rate is 48.66%, the Zn grade of the zinc concentrate is 31.22%, the Zn recovery rate is 58.20%, the S grade of the sulfur concentrate is 38.91%, and the S recovery rate is 68.56%.

[0157] The silver-copper-lead-antimony concentrate of Comparative Example 3 has an Ag grade of 3967.8 g / t, an Ag recovery rate of 79.73%, a Cu grade of 9.28%, a Cu recovery rate of 74.02%, a Pb grade of 8.12%, a Pb recovery rate of 59.33%, an Sb grade of 5.93%, an Sb recovery rate of 59.73%, a zinc concentrate with a Zn grade of 35.91% and a Zn recovery rate of 68.60%, and a sulfur concentrate with an S grade of 42.17% and an S recovery rate of 66.99%;

[0158] The silver-copper-lead-antimony concentrate of Comparative Example 4 has an Ag grade of 3695.8 g / t, an Ag recovery rate of 67.78%, a Cu grade of 8.96%, a Cu recovery rate of 67.50%, a Pb grade of 9.69%, a Pb recovery rate of 52.09%, an Sb grade of 6.37%, an Sb recovery rate of 45.70%, a zinc concentrate with a Zn grade of 30.68% and a Zn recovery rate of 58.50%, and a sulfur concentrate with an S grade of 36.11% and an S recovery rate of 60.79%.

[0159] Therefore, through comprehensive comparison, it can be found that the indexes obtained by using the method of the present invention are significantly higher than those obtained by the prior art, showing remarkable progress.

[0160] It can be seen from the comparison between Examples 1 to 4 and Comparative Examples 1 to 4 that the present invention's examples can obtain silver-copper concentrate, lead-antimony concentrate, zinc concentrate and sulfur concentrate, while the comparative examples can only obtain silver-copper-lead-antimony concentrate, zinc concentrate and sulfur concentrate. Due to the strong effect of the bulk flotation sulfide ore reagent, lead-antimony concentrate cannot be obtained.

[0161] In terms of indexes, the silver-copper concentrate obtained in Example 1 of the present invention has a silver grade 4101.7 g / t higher than that of Comparative Example 1, a copper grade 9.24% higher, a silver recovery rate 3.83% higher, a copper recovery rate 4.19% higher, a zinc concentrate with a zinc grade 8.4% higher and a zinc recovery rate 8.13% higher, the sulfur concentrate grades are basically the same, and the sulfur recovery rate is 5.56% higher;

[0162] The silver-copper concentrate obtained in Example 2 has a silver grade 5953.2 g / t higher than that of Comparative Example 2, a copper grade 10.86% higher, a silver recovery rate 8.22% higher, a copper recovery rate 12.45% higher, a zinc concentrate with a zinc grade 9.69% higher and a zinc recovery rate 10.42% higher, and the sulfur concentrate grades and recovery rates are basically the same;

[0163] The silver-copper concentrate obtained in Example 3 has a silver grade 3297 g / t higher than that of Comparative Example 3, a copper grade 8.84% higher, a silver recovery rate 3.32% higher, a copper recovery rate 6.21% higher, a zinc concentrate with a zinc grade 9.21% higher and a zinc recovery rate 8.64% higher, the sulfur concentrate grades are basically the same, and the sulfur recovery rate is 5.66% higher;

[0164] The silver grade of the silver-copper concentrate obtained in Example 4 is 6,547.7 g / t higher than that in Comparative Example 4, the copper grade is 11.95% higher, the silver recovery rate is 12.23% higher, the copper recovery rate is 2.58% higher, the zinc grade of the zinc concentrate is 12.18% higher, the zinc recovery rate is 15.37% higher, and the grade and recovery rate of the sulfur concentrate are basically the same.

[0165] The beneficiation method of the present invention significantly improves the concentrate grades of silver, copper, lead, zinc, antimony and sulfur in complex silver-tin ores and the recovery rates of valuable metals.

Claims

1. A beneficiation method for recovering silver, copper, lead, zinc, antimony and sulfur from complex silver-tin paragenetic ore, characterized in that: The steps include: S1. Grinding the complex silver-tin paragenetic ore to obtain raw ore; S2, silver, copper, lead, antimony, sulfur and other flotation: adding inhibitors and collectors to the raw ore described in step S1 to carry out flotation of silver, copper, lead, antimony, sulfur and other ore to obtain a silver, copper, lead, antimony, sulfur mixed concentrate and flotation tailings; S3, flotation separation of silver-copper and lead-antimony-sulfur: grinding the silver-copper-lead-antimony-sulfur mixed concentrate described in step S2, and then adding a depressant and a collector for flotation to obtain a silver-copper concentrate and a lead-antimony-sulfur mixed concentrate; S4, flotation separation of lead, antimony and sulfur: adding inhibitors, collectors and frothers to the lead-antimony-sulfur mixed concentrate in step S3 for flotation to obtain lead-antimony concentrate and sulfur concentrate 1; S5, zinc-sulfur mixed flotation: adding an activator, a collector, and a frother to the equal-floating tailings in step S2 to carry out zinc-sulfur mixed flotation to obtain a zinc-sulfur mixed concentrate and floating sulfur tailings; S6. Add an inhibitor to the zinc-sulfur mixed concentrate described in step S5, grind the ore, add an activator and a collector to separate the zinc and sulfur, and obtain a zinc concentrate and a sulfur concentrate 2.

2. The ore dressing method according to claim 1, characterized in that: The complex silver-tin paragenetic ore in step S1 has an Ag grade of 88.3 g / t to 163.6 g / t, a Cu grade of 0.21% to 0.42%, a Pb grade of 0.30% to 0.40%, a Zn grade of 0.96% to 1.76%, a Sb grade of 0.20% to 0.31%, and an S grade of 3.44% to 7.43%.

3. The ore dressing method according to claim 1, characterized in that: Step S2 is to add 1000g / t to 3000g / t of inhibitor to the raw ore in step S1, stir, then add 60g / t to 120g / t of collector, stir, do rough selection, then add 20g / t to 30g / t of collector, do a scavenging selection, add 8g / t to 20g / t of collector, do a second scavenging selection, then add 40g / t to 400g / t of inhibitor, do a second to third concentration, and obtain a silver, copper, lead, antimony and sulfur mixed concentrate and an isoflurane tailings; The collector is any one of butyl ammonium black medicine, Z200, ethyl xanthate, ethyl dixanthate or a combination of two thereof; The inhibitor is any two or three of sodium carbonate, zinc sulfate, sodium sulfite and water glass.

4. The ore dressing method according to claim 1, characterized in that: The grinding in step S1 is to grind the complex silver-tin paragenetic ore in step S1 into ore particles with a particle size of 0.2mm-0.3mm; the grinding in step S3 is to grind the silver-copper-lead-antimony-sulfur mixed concentrate in step S2 into particles with a particle size of less than or equal to 0.043mm, which accounts for 70%-80% of the total particle mass; the grinding in step S6 is to add an inhibitor to the zinc-sulfur mixed concentrate in step S5, and grind it into particles with a particle size of less than or equal to 0.043mm, which accounts for 70%-75% of the total particle mass.

5. The ore dressing method according to claim 1, characterized in that: Step S3 is to grind the silver-copper-lead-antimony-sulfur mixed concentrate in step S2, add 100 g / t to 300 g / t of inhibitor, stir, then add 1 g / t to 3 g / t of collector, stir, do rough selection, then add 0.2 g / t to 0.5 g / t of collector, do a scavenging selection, then add 0.1 g / t to 0.3 g / t of collector, do a second scavenging selection, then add 20 g / t to 60 g / t of inhibitor, do second to third concentration, and obtain silver-copper concentrate and lead-antimony-sulfur mixed concentrate; The inhibitor is any one of sodium sulfite and sodium thiosulfate or a combination of the two; The collector is any one of 25# black medicine and 15# black medicine.

6. The ore dressing method according to claim 1, characterized in that: Step S4 is to add 100 g / t to 300 g / t of inhibitor to the lead-antimony-sulfur mixed concentrate in step S3, stir, then add 2 g / t to 6 g / t of collector, stir, then add 0.5 g / t to 1 g / t of frother, do roughing, then add 0.5 g / t to 1 g / t of collector, do a scavenging, then add 0.2 g / t to 0.4 g / t of collector, do a second scavenging, then add 20 g / t to 60 g / t of inhibitor, do second to third concentration, and obtain lead-antimony concentrate and sulfur concentrate 1; The inhibitor is any one of lime and sodium humate or a combination of the two; The collector is any one of ethyl thiocyanate and ethyl thiocyanate acrylonitrile; The foaming agent is methyl isobutyl carbinol.

7. The ore dressing method according to claim 1, characterized in that: Step S5 is to add 80g / t to 600g / t of activator to the equal-floating tailings in step S2, stir, then add 80g / t to 120g / t of collector, stir, then add 10g / t to 20g / t of frother, do roughing, then add 10g / t to 20g / t of collector, do a scavenging, then add 10g / t to 20g / t of collector, do a second scavenging, then perform second to third concentration, to obtain zinc-sulfur mixed concentrate and floating sulfur tailings; The activator is one or a combination of copper sulfate and oxalic acid; The collector is any one of butyl xanthate, ethyl xanthate, and Z200, or a combination of two thereof; The foaming agent is pine oil or methyl isobutyl carbinol.

8. The ore dressing method according to claim 1, characterized in that: Step S6 is to add 200 g / t to 600 g / t of inhibitor to the zinc-sulfur mixed concentrate in step S5, then grind the ore, then add 5 g / t to 10 g / t of activator, stir, then add 2 g / t to 4 g / t of collector, stir, perform roughing, then add 0.5 g / t to 1 g / t of collector, perform a scavenging, then add 0.2 g / t to 0.4 g / t of collector, perform a second scavenging, then add 40 g / t to 100 g / t of inhibitor, perform three to four times of concentration, and obtain zinc concentrate and sulfur concentrate 2; The activator is copper sulfate; The inhibitor is any one of lime and sodium humate or a combination of the two; The collector is any one of ethyl xanthate and butyl xanthate or a combination of the two.

9. The ore dressing method according to claim 1, characterized in that: The inhibitor in step S4 is a composition of lime and sodium humate in a mass ratio of 10:1; the inhibitor in step S6 is a composition of lime and sodium humate in a mass ratio of 10:1.

Images