Method for recovering silver-rich stannite, marmatite and pyrite from complex tin polymetallic ore

Abstract

The invention belongs to the technical field of mineral separation and recovery, and particularly relates to a method for recovering silver-rich stannite, marmatite and pyrite from complex tin polymetallic ore. The method comprises the steps of raw ore grinding, silver-rich stannite preferential flotation, marmatite and pyrite bulk flotation, marmatite and pyrite flotation separation and the like. According to the beneficiation method, the special properties of the complex tin polymetallic ore are combined, the difference of floatability of sulfide minerals is utilized, the step-by-step flotation and enrichment technological process is adopted, efficient enrichment and separation of valuable minerals of the complex tin polymetallic ore are achieved, various valuable minerals such as silver-rich stannum ore, marmatite and pyrite in the ore are effectively recycled, and the beneficiation method is suitable for industrial production. And in the recovery process, the reagent dosage is low, the separation effect is good, and the ore dressing cost is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing and recovery, and in particular relates to a method for recovering silver-rich stannite, sphalerite and pyrite from complex tin polymetallic ores. Background Art

[0002] Silver has been a precious metal since ancient times and has long been used as hard currency. With the rapid development of science and technology, silver has been more widely used due to its excellent stability, conductivity and other special properties. However, silver also has a strong affinity for sulfur, so in nature, silver often coexists with sulfide minerals to form complex polymetallic paragenetic ores such as silver, copper, tin, zinc and sulfur. Among these paragenetic ores, silver-rich stannite, sphalerite and pyrite are very common sulfide minerals in tin polymetallic ores, which have the characteristics of complex intergrowth relationships, extremely uneven intergrowth particle size, and low content of co-existing elements. The long-term lack of suitable mineral processing technology has made it impossible for these tin polymetallic ores to be effectively recycled, resulting in the loss of a large amount of precious silver, copper, zinc, tin and sulfur resources.

[0003] In order to solve the above problems, a variety of recovery technologies for complex tin polymetallic ores have been successfully developed. For example, a beneficiation test study was carried out for the properties of silver-copper-lead-zinc polymetallic sulfide ores. The results showed that the closed-circuit test can obtain good indicators by using a partial mixed flotation process and suitable process conditions. The copper grade in the copper concentrate is 20.21%, the copper recovery rate is 68.74%, the silver content is 11772.06g / t, and the silver recovery rate is 29.23%; the lead grade in the lead concentrate is 58.64%, the lead recovery rate is 90.38%, the silver content is 2448.30g / t, and the silver recovery rate is 57.38%; the zinc grade in the zinc concentrate is 57.33%, the zinc recovery rate is 86.10%, the silver content is 164.00g / t, and the silver recovery rate is 3.22%. The total silver recovery rate in this method is 89.83%, and copper, lead, zinc and silver are all effectively and comprehensively recovered. However, this method recovers metal ores such as copper concentrate and lead concentrate, and cannot recover sulfide minerals such as silver-rich stannite, sphalerite, and pyrite, which will also cause a waste of these resources.

[0004] For arsenic- and antimony-rich, difficult-to-select silver-copper-lead-zinc polymetallic ores, the copper-lead-zinc sequential optimal flotation process was adopted, and the high-efficiency copper agent BK905B and the high-efficiency lead agent BK906 were applied to produce copper concentrate for hydrometallurgical treatment and separate lead concentrate and zinc concentrate. In view of the characteristics of high-arsenic difficult-to-select copper-lead-zinc-antimony-zinc ores, the flotation-gravity process was adopted to comprehensively recover copper, lead, antimony, zinc and tungsten. During the recovery process, the flotation process used the copper-lead-antimony mixed flotation separation-zinc-arsenic mixed flotation separation process to recover copper, lead, antimony and zinc mixed flotation tailings and re-select tungsten. This method has a complex recovery process, which greatly increases the recovery cost. Moreover, this method also cannot achieve efficient separation and recovery of sulfide minerals.

[0005] Chinese patent application CN110404690A discloses a method for recovering independent silver minerals from silver-tin paragenetic ore. The research object is silver-tin paragenetic ore. First, the ore is ground to less than 15mm by grinding, and then pre-screened by high-frequency vibrating screen to obtain raw ore below 0.2mm and raw ore above 0.2mm. The raw ore above 0.2mm is returned to grinding, and the cycle is repeated to obtain raw ore below 0.2mm. The raw ore below 0.2mm is subjected to independent silver mineral enhanced flotation to obtain silver concentrate and floating silver tailings, and the floating silver tailings are fed to subsequent cassiterite separation. The raw material selected by this method is silver-tin paragenetic ore, the metal composition is relatively simple, and the recovery process will also be simple. Moreover, this method only realizes the recovery of independent silver minerals, and the recovered minerals are relatively single, and it is still impossible to achieve the separation and recovery of multiple valuable sulfide minerals.

[0006] Therefore, at present, there is a lack of economical and reasonable mineral processing technology for recovering silver-rich stannic ore, sphalerite and pyrite from complex tin polymetallic ores. For complex tin polymetallic ores, the current mineral processing technology is usually: grinding sulfide ore mixed flotation, outputting sulfide ore mixed concentrate, and the floating sulfur tailings are sent to cassiterite for separation. The obtained sulfide ore mixed concentrate is subjected to the action of a large amount of sulfiding agents, resulting in poor separation effect, and the obtained concentrate has a low grade, or even cannot be separated, and the efficiency is poor. It is of great value to develop a method for simultaneously recovering multiple sulfide minerals such as silver-rich stannic ore, sphalerite, pyrite, etc. in complex tin polymetallic ores. Summary of the invention

[0007] In view of the above-mentioned difficulties, the present invention provides a method to achieve the comprehensive recovery of silver-rich stannite, sphalerite and pyrite resources co-existing in tin polymetallic ores, and create favorable conditions for subsequent cassiterite selection. The method has the characteristics of short process, low dosage of reagents, and advanced technical and economic indicators.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A method for recovering silver-rich stannite, sphalerite and pyrite from a complex tin polymetallic ore comprises the following steps:

[0010] S1. Grinding and screening the raw ore to obtain a ground product;

[0011] S2. Silver-rich tin ore flotation: adding an inhibitor to the product after grinding obtained in step S1 and stirring it, then adding a collector thereto for roughing and scavenging, adding an inhibitor after scavenging, and performing 2 to 3 times of concentrating to obtain a silver-rich tin ore concentrate and a floating tin ore tailings;

[0012] S3. Zinc-sulfur mixed flotation: adding an activator and a collector to the floating tin ore tailings obtained in step S2, stirring, continuing to add a frother for roughing, adding a collector for sweeping after roughing, performing two to three blank selections without adding agents, and obtaining a zinc-sulfur mixed concentrate and floating sulfur tailings;

[0013] S4. Add an inhibitor to the zinc-sulfur mixed concentrate obtained in step S3, and grind the ore to 75%-85% below 0.043 mm to obtain a ground zinc-sulfur mixed concentrate;

[0014] S5. Zinc-sulfur separation: add an activator to the zinc-sulfur mixed concentrate after grinding obtained in step S4 for stirring, then add a collector thereto for roughing and scavenging. After the scavenging is completed, add an inhibitor to the concentrate and carry out three to four times of concentrating to obtain zinc concentrate and sulfur concentrate.

[0015] The biggest characteristics of silver-rich stannite, sphalerite and pyrite associated with tin-polymetallic ores are that there are many types of valuable minerals but low content, and the embedded particle size is uneven. The subsequent cassiterite beneficiation restricts the particle size of sulfide ore selection, and at the same time, the sulfide ore beneficiation reagents are required to interfere with cassiterite selection as little as possible. Therefore, the recovery of silver, copper, tin, zinc and sulfur from tin-polymetallic ores requires the development of reasonable processes and economically feasible technologies, which places high demands on the combination of beneficiation technology and beneficiation reagents.

[0016] The method provided by the present invention combines the special properties of silver-rich stannoyce, sphalerite, and pyrite in tin polymetallic ores and the need for cassiterite selection, adopts coarser particle size selection, and in the recovery process, preferentially floats the silver-rich stannoyce to ensure that high-value silver and copper are fully recovered, and then strengthens the removal of zinc-sulfur minerals, while ensuring good separation of zinc and sulfur and efficient desulfurization, achieving the main process without introducing lime, avoiding serious interference with subsequent cassiterite selection. Finally, concentrate products such as silver-rich stannoyce concentrate, zinc concentrate, and sulfur concentrate are obtained.

[0017] Preferably, the particle size of the product after grinding in step S1 is less than 0.3 mm, the Ag grade is 62.7 g / t to 81.0 g / t, the Cu grade is 0.18% to 0.31%, the Sn grade is 0.53% to 0.61%, the Zn grade is 0.94% to 1.43%, and the S grade is 2.66% to 3.52%.

[0018] The method provided by the present invention includes adding an inhibitor after grinding in S2 to suppress zinc-sulfur minerals, separating silver-rich tetrahedrite from zinc sphalerite / pyrite, and obtaining silver-copper concentrate; adding an activator and a collector to the silver-copper tailings in S3 to capture the suppressed zinc-sulfur minerals and obtain a zinc-sulfur mixed concentrate; adding an inhibitor, an activator and a collector in S4 / S5 to separate zinc and sulfur and obtain zinc concentrate and sulfur concentrate. Through step-by-step equal flotation and regrinding for efficient flotation separation, various valuable sulfide minerals in complex tin polymetallic ores can be recovered in an enhanced manner.

[0019] Preferably, the amount of inhibitor added to the product after grinding in step S2 is 1600g / t to 3000g / t, and the amount of inhibitor added after scavenging is 200g / t to 600g / t, and the inhibitor is selected from two or three of sodium carbonate, zinc sulfate, sodium sulfite and sodium thiosulfate.

[0020] Preferably, the specific process of adding a collector for rough selection and scavenging in step S2 is as follows: first, add 60g / t to 120g / t of collector, stir for rough selection, add 20g / t to 30g / t of collector after rough selection, do a scavenging, and then add 10g / t to 20g / t of collector for a second scavenging; the collector is selected from one or two of butyl ammonium black medicine, Z200, ethyl xanthate, and ethyl dixanthate.

[0021] Preferably, in step S3, the amount of the activator added is 120 g / t to 800 g / t, and the amount of the collector added is 80 g / t to 120 g / t; the activator is selected from one or both of copper sulfate and oxalic acid; the collector is selected from one or both of butyl xanthate and ethyl xanthate.

[0022] Preferably, the amount of the foaming agent added in step S3 is 10g / t to 20g / t, and the foaming agent is selected from one of pine oil and methyl isobutyl carbinol; the process of adding the collector for scavenging is as follows: adding 10g / t to 20g / t of the collector, doing one scavenging, adding 5g / t to 10g / t of the collector, doing a second scavenging; the collector is selected from one or both of butyl xanthate and ethyl xanthate.

[0023] Preferably, the amount of the inhibitor added in step S4 is 500 g / t to 800 g / t, and the inhibitor is selected from one or both of lime and sodium humate.

[0024] Preferably, the amount of the activator added in step S5 is 10 g / t to 15 g / t, and the activator is selected from one or both of copper sulfate and oxalic acid.

[0025] Preferably, the process of adding a collector for roughing and scavenging in step S5 is as follows: first add 4g / t to 8g / t of collector for roughing, then add 0.6g / t to 1g / t of collector for one scavenging, and finally add 0.2g / t to 0.5g / t of collector for two scavenging, wherein the collector is selected from one or two of ethyl xanthate, butyl xanthate, and Z200.

[0026] Preferably, the inhibitor added in step S5 is 60 g / t to 120 g / t, and the inhibitor is selected from two or three of sodium carbonate, zinc sulfate, sodium sulfite and sodium thiosulfate.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) Under the condition of coarse grinding and selection, the step-by-step and segmented flotation method is adopted to efficiently separate silver, copper, zinc, sulfur and tin, and obtain silver-rich stannic ore concentrate, zinc concentrate and sulfur concentrate from complex tin polymetallic ores, effectively improving the indicators and realizing the efficient recovery of silver-rich stannic ore, sphalerite and pyrite in complex tin polymetallic ores, while creating good conditions for subsequent cassiterite selection.

[0029] (2) The present invention utilizes coarse grinding of sulfide ore for stepwise equal flotation and regrinding for efficient flotation separation, thereby realizing resource recovery of silver, copper, zinc and sulfur in complex tin polymetallic ores. The entire process is compact and conducive to industrial application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The recovery flow chart of the method of the present invention is shown in FIG. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with examples. These examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples where specific conditions are not specified are generally performed in accordance with conventional conditions in the art or in accordance with the conditions recommended by the manufacturer; the raw materials, reagents, etc. used, unless otherwise specified, are all raw materials and reagents that can be obtained from commercial channels such as conventional markets. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention are within the scope of protection claimed by the present invention. Example 1 A method for recovering silver-rich stannane, sphalerite and pyrite from a complex tin polymetallic ore

[0032] The sample is from a complex tin polymetallic mine in Inner Mongolia. The main valuable minerals are silver-rich stannite, chalcopyrite, sphalerite, pyrite, cassiterite, etc., among which the Ag grade is 62.7g / t~81.0g / t, the Cu grade is 0.18%~0.31%, the Sn grade is 0.53%~0.61%, the Zn grade is 0.94%~1.43%, and the S grade is 2.66%~3.52%.

[0033] The method comprises the following steps:

[0034] S1. Grind the feed ore to -0.3mm;

[0035] S2. Silver-rich tin ore flotation: adding inhibitors and collectors to the product after grinding to flotate the silver-rich tin ore to obtain silver-rich tin ore concentrate and floating tin ore tailings;

[0036] S3. Zinc-sulfur mixed flotation: adding an activator, a collector, and a frother to the floating tin ore tailings to carry out zinc-sulfur mixed flotation to obtain a zinc-sulfur mixed concentrate and floating sulfur tailings;

[0037] S4. Add inhibitor to the zinc-sulfur mixed concentrate and grind it to -0.043mm, accounting for 75%;

[0038] S5. Zinc-sulfur separation: Add activator and collector to the zinc-sulfur mixed concentrate after grinding to separate zinc and sulfur to obtain zinc concentrate and sulfur concentrate.

[0039] The specific reagent usage is shown in Table 1. The feed ore is a complex tin polymetallic mine in Inner Mongolia.

[0040] Example 2 A method for recovering silver-rich stannite, sphalerite and pyrite from a complex tin polymetallic ore

[0041] The sample is from a complex tin polymetallic mine in Yunnan. The main valuable minerals are silver-rich stannite, chalcopyrite, sphalerite, pyrite, cassiterite, etc. The Ag grade is 81.0 g / t, the Cu grade is 0.27%, the Sn grade is 0.59%, the Zn grade is 1.23%, and the S grade is 3.47%.

[0042] The method is similar to that of Example 1;

[0043] The difference from Example 1 is that in Example 2, step S1 grinds the ore to less than 0.25 mm, and step S4 grinds the ore to less than 0.043 mm, accounting for 85%.

[0044] See Table 1 for specific drug usage.

[0045] Example 3 A method for recovering silver-rich stannite, sphalerite and pyrite from a complex tin polymetallic ore

[0046] The sample is from a complex tin polymetallic mine in Hunan. The main valuable minerals are silver-rich stannite, chalcopyrite, sphalerite, pyrite, cassiterite, etc. The Ag grade is 69.7 g / t, the Cu grade is 0.23%, the Sn grade is 0.57%, the Zn grade is 1.22%, and the S grade is 3.16%.

[0047] The method is similar to that of Example 1;

[0048] The difference from Example 1 is that in Example 2, step S1 grinds the ore to less than 0.2 mm, and step S4 grinds the ore to less than 0.043 mm, accounting for 80%.

[0049] See Table 2 for specific drug usage.

[0050] Example 4 A method for recovering silver-rich stannite, sphalerite and pyrite from a complex tin polymetallic ore

[0051] The sample is from a complex tin polymetallic mine in Guangxi. The main valuable minerals are silver-rich stannite, chalcopyrite, sphalerite, pyrite, cassiterite, etc., with an Ag grade of 67.4 g / t, a Cu grade of 0.23%, a Sn grade of 0.53%, a Zn grade of 0.97%, and an S grade of 2.69%.

[0052] The method is similar to that of Example 1;

[0053] The difference from Example 1 is that in Example 2, step S1 grinds the ore to less than 0.25 mm, and step S4 grinds the ore to less than 0.043 mm, accounting for 78%.

[0054] See Table 2 for specific drug usage.

[0055] Comparative Example 1 A conventional beneficiation method for a complex tin polymetallic ore

[0056] The conventional beneficiation method of complex tin polymetallic ores includes the following steps:

[0057] S1. Grind the feed ore to less than 0.3 mm;

[0058] S2. Sulfide ore mixed flotation: Add inhibitors, collectors and frothers to the grinding products for mixed flotation of sulfide ore to obtain sulfide ore mixed concentrate and floating sulfur tailings;

[0059] S3. Adding activated carbon to the mixed sulfide ore concentrate for de-doping;

[0060] S4. Add inhibitor to the mixed concentrate of desulfurized ore and grind the ore to less than 0.043mm, accounting for 78%;

[0061] S5. Silver-rich stannous ore and zinc-sulfur flotation separation: adding a collector to the sulfide ore mixed concentrate after grinding for flotation to obtain silver-rich stannous ore concentrate and zinc-sulfur mixed concentrate;

[0062] S6. Zinc-sulfur separation: Add inhibitors, activators and collectors to the zinc-sulfur mixed concentrate to separate zinc and sulfur to obtain zinc concentrate and sulfur concentrate.

[0063] The ore feeding is the same as that in Example 1. The specific reagent usage is shown in Table 3.

[0064] Comparative Example 2 A conventional beneficiation method for a complex tin polymetallic ore

[0065] The conventional beneficiation method of the complex tin polymetallic ore comprises the following steps:

[0066] S1. Grind the feed ore to less than 0.25 mm;

[0067] S2. Sulfide ore mixed flotation: Add inhibitors, collectors and frothers to the grinding products for mixed flotation of sulfide ore to obtain sulfide ore mixed concentrate and floating sulfur tailings;

[0068] S3 adds activated carbon to the mixed concentrate of sulfide ore for de-doping;

[0069] S4 adds inhibitors to the mixed concentrate of desulfurized ore after demineralization, and grinds the ore to less than 0.043mm, accounting for 85%;

[0070] S5. Silver-rich stannous ore and zinc-sulfur flotation separation: adding a collector to the sulfide ore mixed concentrate after grinding for flotation to obtain silver-rich stannous ore concentrate and zinc-sulfur mixed concentrate;

[0071] S6. Zinc-sulfur separation: Add inhibitors, activators and collectors to the zinc-sulfur mixed concentrate to separate zinc and sulfur to obtain zinc concentrate and sulfur concentrate.

[0072] The ore feeding is the same as that in Example 2. The specific reagent usage is shown in Table 3.

[0073] Comparative Example 3 A conventional beneficiation method for a complex tin polymetallic ore

[0074] The conventional beneficiation method of complex tin polymetallic ores includes the following steps:

[0075] S1. Grind the feed ore to less than 0.2 mm;

[0076] S2. Sulfide ore mixed flotation: Add inhibitors, collectors and frothers to the grinding products for mixed flotation of sulfide ore to obtain sulfide ore mixed concentrate and floating sulfur tailings;

[0077] S3. Adding activated carbon to the mixed sulfide ore concentrate for de-doping;

[0078] S4. Add inhibitor to the mixed concentrate of desulfurized ore and grind the ore to less than 0.043mm, accounting for 78%;

[0079] S5. Silver-rich stannous ore and zinc-sulfur flotation separation: adding a collector to the sulfide ore mixed concentrate after grinding for flotation to obtain silver-rich stannous ore concentrate and zinc-sulfur mixed concentrate;

[0080] S6. Zinc-sulfur separation: Add inhibitors, activators and collectors to the zinc-sulfur mixed concentrate to separate zinc and sulfur to obtain zinc concentrate and sulfur concentrate.

[0081] The ore feeding is the same as that in Example 3. The specific reagent usage is shown in Table 4.

[0082] Comparative Example 4: Conventional beneficiation method for a complex tin polymetallic ore

[0083] The conventional beneficiation method of complex tin polymetallic ores includes the following steps:

[0084] S1. Grind the feed ore to less than 0.25 mm;

[0085] S2. Sulfide ore mixed flotation: Add inhibitors, collectors and frothers to the grinding products for mixed flotation of sulfide ore to obtain sulfide ore mixed concentrate and floating sulfur tailings;

[0086] S3. Adding activated carbon to the mixed sulfide ore concentrate for de-doping;

[0087] S4. Add inhibitor to the mixed concentrate of desulfurized ore and grind it to less than 0.043mm, accounting for 81%;

[0088] S5. Silver-rich stannous ore and zinc-sulfur flotation separation: adding a collector to the sulfide ore mixed concentrate after grinding for flotation to obtain silver-rich stannous ore concentrate and zinc-sulfur mixed concentrate;

[0089] S6. Zinc-sulfur separation: Add inhibitors, activators and collectors to the zinc-sulfur mixed concentrate to separate zinc and sulfur to obtain zinc concentrate and sulfur concentrate.

[0090] The ore feeding is the same as that in Example 4. The specific reagent usage is shown in Table 4.

[0091] Table 1: The reagent usage of the ore dressing method of Examples 1 to 2

[0092]

[0093]

[0094] Table 2: Reagent usage of the ore dressing method of Examples 3 to 4

[0095]

[0096]

[0097] Table 3 Comparative Examples 1 to 2 of the ore dressing method using reagents

[0098]

[0099]

[0100]

[0101] Table 4: The use of reagents in the mineral processing methods of comparative examples 3 to 4

[0102]

[0103]

[0104] Test example grade determination

[0105] 1. Test samples: mineral products recovered from Examples 1 to 4 and Comparative Examples 1 to 4;

[0106] 2. Test method: Use ICP inductively coupled plasma spectrometer to measure silver / low tin / low zinc (0.1-10%), gravimetric method to measure sulfur / high copper / high zinc / high tin (more than 10%), and XRF fluorescence analyzer to measure low copper (no more than 0.1%) and low tin (no more than 0.1%).

[0107] 3. Test results: The specific test results are shown in Tables 5 and 6.

[0108] Table 5 Selection results of Examples 1 to 4

[0109]

[0110] Table 6 Selection method of comparative examples 1 to 4

[0111]

[0112]

[0113] The existing beneficiation technology for silver-tin paragenetic ore containing copper, lead, zinc, antimony and sulfur is: mixed flotation of sulfide ore-drug removal of mixed concentrate-separation of silver-rich stannic ore from zinc and sulfur-separation of zinc and sulfur. Comparative Examples 1, 2, 3 and 4 use the existing technology to process the raw ores of Examples 1, 2, 3 and 4, and the corresponding test indicators obtained are specifically:

[0114] Example 1, silver-rich tin ore concentrate Ag grade 4239.7g / t, Ag recovery rate can reach 80.62%, Cu grade 12.15%, Cu recovery rate 72.77%, Sn grade 5.96%, Sn recovery rate 13.78%, zinc concentrate Zn grade 42.91%, Zn recovery rate 79.03%, sulfur concentrate S grade 40.53%, S recovery rate 47.65%; Comparative Example 1, silver-rich tin ore concentrate Ag grade 2658.7g / t, Ag recovery rate 72.36%, Cu grade 7.85%, Cu recovery rate 69.91%, Sn grade 3.42 %, Sn recovery rate 11.25%, zinc concentrate Zn grade 34.61%, Zn recovery rate 67.66%, sulfur concentrate S grade 38.67%, S recovery rate 36.46%; Example 1 Compared with Comparative Example 1, the silver grade of the silver-rich tin ore concentrate obtained in Example 1 is 1581.0g / t higher, the copper grade is 4.30% higher, the tin grade is 2.54% higher, the silver recovery rate is 8.26% higher, the copper recovery rate is 2.86% higher, the tin recovery rate is 2.53% higher, the zinc grade of the zinc concentrate is 8.30% higher, the zinc recovery rate is 11.37% higher, the sulfur grade of the sulfur concentrate is 1.86% higher, and the sulfur recovery rate is 11.19% higher.

[0115] In Example 2, the silver-rich tin ore concentrate has an Ag grade of 5134.5 g / t, an Ag recovery rate of 77.03%, a Cu grade of 13.89%, a Cu recovery rate of 72.57%, a Sn grade of 6.98%, a Sn recovery rate of 12.37%, a zinc concentrate Zn grade of 43.24%, a Zn recovery rate of 76.91%, a sulfur concentrate S grade of 40.16%, and a S recovery rate of 61.13%; in Comparative Example 2, the silver-rich tin ore concentrate has an Ag grade of 3236.5 g / t, an Ag recovery rate of 69.44%, a Cu grade of 7.51%, a Cu recovery rate of 56.73%, a Sn grade of 3. 91%, Sn recovery rate 9.77%, zinc concentrate Zn grade 31.16%, Zn recovery rate 61.05%, sulfur concentrate S grade 37.15%, S recovery rate 50.77%; by comparison, in Example 2, the silver grade of the obtained silver-rich tin ore concentrate is 1898g / t high, the copper grade is 6.38% high, the tin grade is 3.07% high, the silver recovery rate is 7.59% high, the copper recovery rate is 15.84% high, the tin recovery rate is 2.60% high, the zinc grade of the zinc concentrate is 12.08% high, the zinc recovery rate is 15.86% high, the sulfur grade of the sulfur concentrate is 3.01% high, and the sulfur recovery rate is 10.36% high.

[0116] Example 3, silver-rich tin ore concentrate Ag grade 3264.8g / t, Ag recovery rate can reach 74.89%, Cu grade 14.82%, Cu recovery rate 82.05%, Sn grade 7.28%, Sn recovery rate 22.69%, zinc concentrate Zn grade 45.12%, Zn recovery rate 80.72%, sulfur concentrate S grade 43.15%, S recovery rate 55.09%; Comparative Example 3, silver-rich tin ore concentrate Ag grade 2134.2g / t, Ag recovery rate 63.57%, Cu grade 8.92%, Cu recovery rate 65.45%, Sn grade 4.13% , Sn recovery rate 16.72%, zinc concentrate Zn grade 33.92%, Zn recovery rate 65.94%, sulfur concentrate S grade 41.12%, S recovery rate 37.95%; by comparison, in Example 3, the silver grade of the obtained silver-rich tin ore concentrate is 1130.6 g / t high, the copper grade is 5.90% high, the tin grade is 3.15% high, the silver recovery rate is 11.32% high, the copper recovery rate is 16.60% high, the tin recovery rate is 5.97% high, the zinc grade of the zinc concentrate is 11.20% high, the zinc recovery rate is 14.78% high, the sulfur grade of the sulfur concentrate is 2.03% high, and the sulfur recovery rate is 17.14% high.

[0117] Example 4, silver-rich tin ore concentrate Ag grade 4234.7g / t, Ag recovery rate can reach 82.04%, Cu grade 12.91%, Cu recovery rate 81.41%, Sn grade 6.94%, Sn recovery rate 18.38%, zinc concentrate Zn grade 42.12%, Zn recovery rate 77.91%, sulfur concentrate S grade 41.28%, S recovery rate 55.27%; Comparative Example 4, silver-rich tin ore concentrate Ag grade 2895.8g / t, Ag recovery rate 68.29%, Cu grade 9.26%, Cu recovery rate 71.53%, Sn grade 4.1 2%, Sn recovery rate 13.58%, zinc concentrate Zn grade 31.24%, Zn recovery rate 69.03%, sulfur concentrate S grade 37.65%, S recovery rate 39.78%; by comparison, in Example 4, the silver grade of the silver-rich tin ore concentrate obtained is 1338.9 g / t high, the copper grade is 3.65% high, the tin grade is 2.82% high, the silver recovery rate is 13.75% high, the copper recovery rate is 9.88% high, the tin recovery rate is 4.80% high, the zinc grade of the zinc concentrate is 10.88% high, the zinc recovery rate is 8.88% high, the sulfur grade of the sulfur concentrate is 3.63% high, and the sulfur recovery rate is 15.49% high.

[0118] In summary, the indicators obtained by the method of the present invention are significantly higher than those obtained by the prior art: compared with the comparative example, the grade and recovery rate of the silver-rich tin ore concentrate, zinc concentrate and sulfur concentrate obtained by the present invention are significantly improved.

[0119] Finally, it should be noted that the above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A method for recovering silver-rich stannite, sphalerite and pyrite from complex tin polymetallic ores, characterized in that: The steps include: S1. Grinding and screening the raw ore to obtain a ground product; S2. Silver-rich tin ore flotation: adding an inhibitor to the product after grinding obtained in step S1 and stirring it, then adding a collector thereto for roughing and scavenging, adding an inhibitor after scavenging, and performing 2 to 3 times of concentrating to obtain a silver-rich tin ore concentrate and a floating tin ore tailings; S3. Zinc-sulfur mixed flotation: adding an activator and a collector to the floating tin ore tailings obtained in step S2, stirring, continuing to add a frother for roughing, adding a collector for sweeping after roughing, performing two to three blank selections without adding agents, and obtaining a zinc-sulfur mixed concentrate and floating sulfur tailings; S4. Add an inhibitor to the zinc-sulfur mixed concentrate obtained in step S3, and grind the ore to 75%-85% below 0.043 mm to obtain a ground zinc-sulfur mixed concentrate; S5. Zinc-sulfur separation: add an activator to the zinc-sulfur mixed concentrate after grinding obtained in step S4 for stirring, then add a collector thereto for roughing and scavenging. After the scavenging is completed, add an inhibitor to the concentrate and carry out three to four times of concentrating to obtain zinc concentrate and sulfur concentrate.

2. The method according to claim 1, characterized in that The particle size of the product after grinding in step S1 is less than 0.3 mm, the Ag grade is 62.7 g / t to 81.0 g / t, the Cu grade is 0.18% to 0.31%, the Sn grade is 0.53% to 0.61%, the Zn grade is 0.94% to 1.43%, and the S grade is 2.66% to 3.52%.

3. The method according to claim 1, characterized in that The amount of inhibitor added to the product after grinding in step S2 is 1600g / t to 3000g / t, and the amount of inhibitor added after scavenging is 200g / t to 600g / t. The inhibitor is selected from two or three of sodium carbonate, zinc sulfate, sodium sulfite and sodium thiosulfate.

4. The method according to claim 1, characterized in that The specific process of adding a collector to perform rough selection and scavenging in step S2 is as follows: first, 60 g / t to 120 g / t of a collector is added thereto, and the mixture is stirred for rough selection. After the rough selection, 20 g / t to 30 g / t of a collector is added thereto for a scavenging, and then 10 g / t to 20 g / t of a collector is added for a second scavenging; the collector is selected from one or two of butyl ammonium black medicine, Z200, ethyl xanthate, and ethyl dixanthate.

5. The method according to claim 1, characterized in that In step S3, the amount of the activator added is 120 g / t to 800 g / t, and the amount of the collector added is 80 g / t to 120 g / t; the activator is selected from one or both of copper sulfate and oxalic acid; the collector is selected from one or both of butyl xanthate and ethyl xanthate.

6. The method according to claim 1, characterized in that In step S3, the amount of the foaming agent added is 10 g / t to 20 g / t, and the foaming agent is selected from one of pine oil and methyl isobutyl carbinol; the process of adding the collector for scavenging is as follows: adding 10 g / t to 20 g / t of the collector for one scavenging, adding 5 g / t to 10 g / t of the collector for a second scavenging; the collector is selected from one or both of butyl xanthate and ethyl xanthate.

7. The method according to claim 1, characterized in that The amount of the inhibitor added in step S4 is 500 g / t to 800 g / t, and the inhibitor is selected from one or both of lime and sodium humate.

8. The method according to claim 1, characterized in that In step S5, the amount of the activator added is 10 g / t to 15 g / t, and the activator is selected from one or both of copper sulfate and oxalic acid.

9. The method according to claim 1, characterized in that The process of adding the collector for roughing and scavenging in step S5 is as follows: first add 4g / t~8g / t of collector for roughing, then add 0.6g / t~1g / t of collector for one scavenging, and finally add 0.2g / t~0.5g / t of collector for two scavenging, wherein the collector is selected from one or two of ethyl xanthate, butyl xanthate and Z200.

10. The method according to claim 1, characterized in that The amount of the inhibitor added in step S5 is 60 g / t to 120 g / t, and the inhibitor is selected from two or three of sodium carbonate, zinc sulfate, sodium sulfite, and sodium thiosulfate.

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