Beneficiation method for efficiently recovering silver, copper, zinc and sulfur from complex silver, copper, zinc and sulfur bulk concentrate

Abstract

The invention relates to the technical field of beneficiation and recovery, in particular to a beneficiation method for efficiently recovering silver, copper, zinc and sulfur from complex silver, copper, zinc and sulfur bulk concentrate. The beneficiation method provided by the invention comprises the steps of feeding and screening, ore grinding of a coarse fraction part, silver-copper and zinc-sulfur separation of an ore-ground product, merging of zinc-sulfur concentrate into a fine fraction part for ore grinding, zinc-sulfur separation of an ore-ground product and the like. According to the beneficiation method provided by the invention, the special properties of the silver-copper-zinc-sulfur bulk concentrate are combined, the floatability difference of sulfide minerals is utilized, and the technological process of grading and step-by-step flotation enrichment is adopted, so that efficient enrichment and separation of valuable minerals in the complex silver-copper-zinc-sulfur bulk concentrate are realized, and silver, copper, zinc and sulfur in the complex silver-copper-zinc-sulfur bulk concentrate are effectively recovered; the separation effect is good and the index is advanced.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing and recovery, and more specifically, to a mineral processing method for efficiently recovering silver, copper, zinc and sulfur from complex silver-copper-zinc-sulfur mixed concentrate. 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. Silver has a strong affinity for sulfur, so in nature silver often coexists with sulfide minerals to form complex polymetallic coexisting ores such as silver, copper, zinc and sulfur. In the mineral processing process, complex silver-copper-zinc-sulfur mixed concentrates are usually produced, which have extremely uneven particle size distribution of valuable minerals and low content of co-existing elements such as silver and copper. The long-term lack of suitable mineral processing technology has resulted in the failure to effectively recycle silver and copper, and a large amount of precious silver and copper resources have been lost in zinc concentrates or sulfur concentrates, which not only affects the quality of the zinc concentrate, but also leads to the loss of silver and copper resources.

[0003] Research reports have been published on the recovery technology of mixed concentrates of copper, zinc, sulfur, etc. Ao Shunfu et al. (Experimental study and industrial application of flotation recovery of lead-zinc mixed concentrate from sulfur concentrate) [J]. Mineral Conservation and Utilization, 2019, (02): 55-58. For a lead-zinc sulfur concentrate in Yunnan, lime was used as a pyrite inhibitor, copper sulfate was used as a sphalerite activator, and DF-341 was used as a collector. After 1 roughing, 2 scavenging, regrinding of the rough concentrate, and 4 concentrating processes, the regrinding fineness of the rough concentrate was -0.045mm, accounting for 92%, and a lead-zinc mixed concentrate with a yield of 3.16% and a lead-zinc grade of 54.96% was obtained. Lu Lin et al. (Experimental study on combined inhibitors for separation of copper-zinc mixed concentrate) [J]. Comprehensive Utilization of Minerals, 2017, (02): 40-45. For the copper-zinc mixed concentrate of a concentrator in Guangxi, the experiment adopted the ore dressing process of mixed concentrate regrinding-flotation separation. The research results showed that the combination of the new inhibitor DT and zinc sulfate can effectively remove copper ions in the ore pulp and efficiently inhibit zinc minerals. Under the conditions of mixed concentrate copper grade of 12.48% and zinc grade of 12.75%, the closed-circuit test obtained a copper concentrate with a copper grade of 21.75% and a copper recovery rate of 68.54% after one roughing, two sweeping and one concentrating, and the zinc grade was reduced to 6.88%, achieving effective separation of copper and zinc. Liang Yiqiang et al. (Application of new depressants in flotation separation of a lead-zinc-sulfur mixed concentrate) [J]. Journal of Mineral Conservation and Utilization, 2020, (05): 109-115. For a lead-zinc-sulfur mixed concentrate in Yunnan, new depressants X33 and L3 were used to conduct flotation separation experiments. After flotation separation, the lead-zinc-sulfur mixed concentrate containing 17.35% lead, 6.76% zinc and 31.04% iron was obtained. Lead concentrate containing 64.59% lead, 95.49% lead recovery rate, 326.8g / t silver, 83.29% silver recovery rate, and 4.64% zinc was obtained, as well as zinc concentrate containing 51.56% zinc, 64.09% zinc recovery rate, and 3.55% lead, and sulfur concentrate containing 43.4% sulfur and 78.67% sulfur recovery rate.

[0004] The existing technology lacks an economically reasonable beneficiation technology for complex silver-copper-zinc-sulfur mixed concentrates. For silver-copper-zinc-sulfur mixed concentrates, the technical principle of copper-zinc-sulfur separation is usually adopted. The existing beneficiation technology is usually: de-doping-grinding-silver-copper and zinc-sulfur separation-zinc-sulfur separation, which produces low-grade silver-copper concentrate, zinc concentrate and sulfur concentrate. Since the obtained mixed concentrate is acted on by a large amount of sulfide ore reagents, the separation effect is poor, the obtained concentrate has a low grade, a low recovery rate and poor benefits. Therefore, it is urgent to develop a beneficiation method with good separation effect, which can obtain high-grade and high-recovery silver-copper concentrate, zinc concentrate and sulfur concentrate, and an economically feasible method for efficiently recovering silver, copper, zinc and sulfur from complex silver-copper-zinc-sulfur mixed concentrates. Summary of the invention

[0005] In view of the deficiencies of the prior art, the object of the present invention is to provide a beneficiation method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate. The present invention realizes the efficient enrichment and separation of valuable minerals in a complex silver-copper-zinc-sulfur mixed concentrate. The beneficiation method of the present invention can ultimately obtain silver-copper concentrate, zinc concentrate and sulfur concentrate with high grade and high recovery rate. While obtaining a high-grade silver-copper concentrate, the recovery of zinc and sulfur is fully guaranteed, and the comprehensive recovery of silver, copper, zinc and sulfur resources in the silver-copper-zinc-sulfur mixed concentrate is realized, which has the characteristics of good separation effect and advanced technical and economic indicators.

[0006] The technical solution of the present invention is:

[0007] A method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate comprises the following steps:

[0008] S1 screens the ore to obtain a coarse-grained fraction and a fine-grained fraction;

[0009] S2 adds inhibitor A to the coarse particle part and grinds the ore;

[0010] S3: adding collector A to the product after grinding in step S2 to perform roughing; adding collector A to perform scavenging, adding inhibitor A to perform concentrating, and obtaining silver-copper concentrate and zinc-sulfur concentrate;

[0011] S4 merges the zinc-sulfur concentrate into the fine-grained fraction to obtain zinc-sulfur separation feed ore;

[0012] S5 adds inhibitor B to the zinc-sulfur separation feed ore and grinds the ore;

[0013] S6 zinc-sulfur separation: add an activator, a collector B and a frother to the product after grinding obtained in step S5 for roughing, add a collector B for scavenging, add an inhibitor B for concentrating, and obtain zinc concentrate and sulfur concentrate.

[0014] Furthermore, the Ag grade of the feed ore in step S1 is 169 g / t to 259 g / t, the Cu grade is 0.79% to 0.99%, the Zn grade is 7.42% to 11.59%, and the S grade is 40.57% to 44.02%.

[0015] Furthermore, the particle size of the coarse particle size portion in step S1 is +0.12 mm, and the particle size of the fine particle size portion is -0.12 mm.

[0016] Furthermore, the inhibitor A in step S2 and step S3 is a combination of two or three of lime, zinc sulfate, sodium sulfite, sodium humate and sodium thiosulfate; the inhibitor B in step S5 is a combination of one or two of lime, sodium sulfite and sodium humate.

[0017] Furthermore, the collector A in step S3 is a combination of two of Y89 xanthate, Z200, ethyl xanthate, ethyl dixanthate and ethyl thiocyanate; and the collector B in step S6 is a combination of two of butyl xanthate, ethyl xanthate and ethyl thiocyanate.

[0018] Furthermore, the activator in step S6 is copper sulfate; and the foaming agent is methyl isobutyl carbinol.

[0019] Furthermore, the dosage of the inhibitor A in step S2 is 4000 g / t to 6000 g / t.

[0020] Furthermore, in the step S3, the amount of collector A used in the roughing selection is 20 g / t to 60 g / t; two sweeping selections are performed, and the amount of collector A used in the first sweeping selection is 6 g / t to 8 g / t; the amount of collector A used in the second sweeping selection is 4 g / t to 6 g / t; and the amount of inhibitor A used in the fine selection is 1000 g / t to 2000 g / t.

[0021] Furthermore, in the step S6, the amount of the activator used in the roughing is 120 g / t to 200 g / t, the amount of the collector B used is 30 g / t to 60 g / t, and the amount of the foaming agent used is 2 g / t to 10 g / t; two sweepings are performed, and the amount of the collector B used in the first sweeping is 8 g / t to 12 g / t; the amount of the collector B used in the second sweeping is 6 g / t to 8 g / t; and the amount of the inhibitor B used in the fine sweeping is 2000 g / t to 4000 g / t.

[0022] Furthermore, in step S2, grinding to -0.074 mm accounts for 80% to 85%; and in step S5, grinding to -0.043 mm accounts for 70% to 75%.

[0023] The biggest feature of complex silver-copper-zinc-sulfur mixed concentrate is the types of valuable minerals. The particle sizes of various valuable minerals are extremely different. Recovering silver, copper, zinc and sulfur from the mixed concentrate requires the development of reasonable process and economically feasible technology, which places high demands on the combination of mineral processing technology and mineral processing reagents.

[0024] The present invention provides a beneficiation method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate. According to the characteristics that the particle sizes of various valuable minerals in the mixed concentrate are extremely different, screening and grading are adopted, and the coarse-grained part is ground to separate silver, copper and zinc and sulfur, so as to achieve the purpose of reducing the amount of silver and copper flotation feed and improving the grade of silver and copper flotation feed, thereby improving the silver and copper flotation effect, and obtaining a higher-grade silver-copper concentrate. The zinc-sulfur concentrate is incorporated into the fine-grained part to obtain a zinc-sulfur separation feed, so as to increase the metal content of the zinc-sulfur separation feed, and the zinc-sulfur separation feed is re-ground to separate zinc and sulfur, thereby obtaining a zinc concentrate and a sulfur concentrate. The whole process fully guarantees the recovery of zinc and sulfur while obtaining a higher-grade silver-copper concentrate.

[0025] At present, the existing technology lacks economical and reasonable beneficiation technology for complex silver-copper-zinc-sulfur mixed concentrates. For silver-copper-zinc-sulfur mixed concentrates, the technical principle of copper-zinc-sulfur separation is usually adopted. The existing beneficiation technology is usually: de-drug-grinding-silver-copper and zinc-sulfur separation-zinc-sulfur separation, which produces low-grade silver-copper concentrate, zinc concentrate and sulfur concentrate. Since the obtained mixed concentrate is acted on by a large amount of sulfide ore reagents, the separation effect is poor, the obtained concentrate has a low grade, low recovery rate and poor efficiency. The beneficiation method provided by the present invention combines the special properties of silver-copper-zinc-sulfur mixed concentrates, utilizes the difference in floatability of sulfide minerals, and adopts a process flow of graded and step-by-step flotation enrichment, so as to achieve efficient enrichment and separation of valuable minerals in complex silver-copper-zinc-sulfur mixed concentrates, effectively recover silver, copper, zinc and sulfur in complex silver-copper-zinc-sulfur mixed concentrates, and has good separation effect and advanced indicators.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The present invention screens and grades the complex silver-copper-zinc-sulfur mixed concentrate, adopts the method of coarse and fine separate grinding separation, and efficiently separates silver, copper, zinc and sulfur from each other, thereby obtaining higher-grade silver-copper concentrate, zinc concentrate and sulfur concentrate from the complex silver-copper-zinc-sulfur mixed concentrate, and significantly improving the separation index.

[0028] (2) The whole process of the present invention is compact, has good separation effect, and is conducive to industrialization.

[0029] (3) The present invention utilizes screening and grading - coarse and fine separate grinding separation technology to efficiently separate silver, copper, zinc and sulfur from complex silver-copper-zinc-sulfur mixed concentrates, thereby achieving high-quality utilization of the silver-copper-zinc-sulfur mixed concentrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a process flow chart of the ore dressing method for efficiently recovering silver, copper, zinc and sulfur from complex silver, copper, zinc and sulfur mixed concentrate in Examples 1-4 of the present invention. 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 that do not specify specific conditions are usually carried out according to conventional conditions in the art or according to 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 those skilled in the art on the basis of the present invention belong to the scope of protection claimed by the present invention.

[0032] Example 1: A method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate

[0033] The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate is as follows: Figure 1 , specifically including the following steps:

[0034] S1 screens the ore to obtain a coarse-grained fraction with a particle size of +0.12 mm and a fine-grained fraction with a particle size of -0.12 mm;

[0035] S2 adds inhibitor A to the coarse particle size of +0.12 mm, and grinds the ore to -0.074 mm, accounting for 80%;

[0036] S3: Add collector A to the product after grinding in step S2, stir for 2 minutes, and perform roughing; add collector A, perform two sweeping selections, add inhibitor A, perform two to three concentrations, and obtain silver-copper concentrate and zinc-sulfur concentrate;

[0037] S4 merges the zinc-sulfur concentrate into the fine-grained fraction with a particle size of -0.12 mm to obtain zinc-sulfur separation feed ore;

[0038] S5 adds inhibitor B to the zinc-sulfur separation feed, grinds the ore to -0.043mm, accounting for 70%;

[0039] S6 zinc-sulfur separation: add an activator to the ground product obtained in step S5, stir for 2 minutes, add collector B, stir for 2 minutes, add a frother, stir for 1 minute, perform roughing, add collector B, perform two sweepings, add inhibitor B, perform three to four cleanings, and obtain zinc concentrate and sulfur concentrate.

[0040] The specific reagent usage is shown in Table 1. The feed ore is a complex silver-copper-zinc-sulfur mixed concentrate in Inner Mongolia, with an Ag grade of 178.7 g / t, a Cu grade of 0.84%, a Zn grade of 8.11%, and an S grade of 41.36%. The specific indicators are shown in Table 5.

[0041] Example 2: A method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate

[0042] The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate is as follows: Figure 1 , specifically including the following steps:

[0043] S1 screens the ore to obtain a coarse-grained fraction with a particle size of +0.12 mm and a fine-grained fraction with a particle size of -0.12 mm;

[0044] S2 adds inhibitor A to the coarse particle size of +0.12 mm, and grinds the ore to -0.074 mm, accounting for 85%;

[0045] S3: Add collector A to the product after grinding in step S2, stir for 3 minutes, and perform roughing; add collector A, perform two sweeping selections, add inhibitor A, perform two to three concentrations, and obtain silver-copper concentrate and zinc-sulfur concentrate;

[0046] S4 merges the zinc-sulfur concentrate into the fine-grained fraction with a particle size of -0.12 mm to obtain zinc-sulfur separation feed ore;

[0047] S5 adds inhibitor B to the zinc-sulfur separation feed, grinds the ore to -0.043mm, accounting for 75%;

[0048] S6 zinc-sulfur separation: add an activator to the ground product obtained in step S5, stir for 3 minutes, add collector B, stir for 3 minutes, add a frother, stir for 2 minutes, perform roughing, add collector B, perform two sweeping, add inhibitor B, perform three to four cleanings, and obtain zinc concentrate and sulfur concentrate.

[0049] The specific reagent usage is shown in Table 1. The feed ore is a complex silver-copper-zinc-sulfur mixed concentrate in Jiangxi, with an Ag grade of 249.2 g / t, a Cu grade of 0.99%, a Zn grade of 11.59%, and an S grade of 41.76%. The specific indicators are shown in Table 5.

[0050] Example 3: A method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate

[0051] The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate is as follows: Figure 1 , specifically including the following steps:

[0052] S1 screens the ore to obtain a coarse-grained fraction with a particle size of +0.12 mm and a fine-grained fraction with a particle size of -0.12 mm;

[0053] S2 adds inhibitor A to the coarse particle size of +0.12 mm, and grinds the ore to -0.074 mm, accounting for 82%;

[0054] S3: Add collector A to the product after grinding in step S2, stir for 3 minutes, and perform roughing; add collector A, perform two sweeping selections, add inhibitor A, perform two to three concentrations, and obtain silver-copper concentrate and zinc-sulfur concentrate;

[0055] S4 merges the zinc-sulfur concentrate into the fine-grained fraction with a particle size of -0.12 mm to obtain zinc-sulfur separation feed ore;

[0056] S5 adds inhibitor B to the zinc-sulfur separation feed, grinds the ore to -0.043mm, accounting for 75%;

[0057] S6 zinc-sulfur separation: add an activator to the ground product obtained in step S5, stir for 3 minutes, add collector B, stir for 3 minutes, add a frother, stir for 2 minutes, perform roughing, add collector B, perform two sweeping, add inhibitor B, perform three to four cleanings, and obtain zinc concentrate and sulfur concentrate.

[0058] The specific reagent usage is shown in Table 2. The feed ore is a complex silver-copper-zinc-sulfur mixed concentrate from Hunan, with an Ag grade of 169.4 g / t, a Cu grade of 0.79%, a Zn grade of 7.43%, and an S grade of 44.02%. The specific indicators are shown in Table 5.

[0059] Example 4: A method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate

[0060] The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate is as follows: Figure 1 , specifically including the following steps:

[0061] S1 screens the ore to obtain a coarse-grained fraction with a particle size of +0.12 mm and a fine-grained fraction with a particle size of -0.12 mm;

[0062] S2 adds inhibitor A to the coarse particle size of +0.12 mm, and grinds the ore to -0.074 mm, accounting for 80%;

[0063] S3: Add collector A to the product after grinding in step S2, stir for 3 minutes, and perform roughing; add collector A, perform two sweeping selections, add inhibitor A, perform two to three concentrations, and obtain silver-copper concentrate and zinc-sulfur concentrate;

[0064] S4 merges the zinc-sulfur concentrate into the fine-grained fraction with a particle size of -0.12 mm to obtain zinc-sulfur separation feed ore;

[0065] S5 adds inhibitor B to the zinc-sulfur separation feed, grinds the ore to -0.043mm, accounting for 73%;

[0066] S6 zinc-sulfur separation: add an activator to the ground product obtained in step S5, stir for 23 minutes, add collector B, stir for 3 minutes, add a frother, stir for 2 minutes, perform roughing, add collector B, perform two sweeping, add inhibitor B, perform three to four cleanings, and obtain zinc concentrate and sulfur concentrate.

[0067] The specific reagent usage is shown in Table 2. The feed ore is a complex silver-copper-zinc-sulfur mixed concentrate in Guangxi, with an Ag grade of 259.4 g / t, a Cu grade of 0.83%, a Zn grade of 9.84%, and an S grade of 40.57%. The specific indicators are shown in Table 5.

[0068] Comparative Example 1

[0069] The conventional beneficiation method of complex silver-copper-zinc-sulfur mixed concentrate includes the following steps:

[0070] S1 will add activated carbon to the ore for drug removal;

[0071] S2 grinds the mixed concentrate after de-doping to -0.043mm, accounting for 70%;

[0072] S3 adds inhibitors, collectors and frothers to the products after grinding to flotation separate silver-copper from zinc-sulfur to obtain silver-copper concentrate and zinc-sulfur concentrate;

[0073] S4 adds inhibitors, activators, collectors and frothers to the zinc-sulfur concentrate to separate zinc and sulfur to obtain zinc concentrate and sulfur concentrate.

[0074] The ore feeding is the same as that in Example 1. The specific reagent usage is shown in Table 3, and the specific indicators are shown in Table 6.

[0075] Comparative Example 2

[0076] The conventional beneficiation method of complex silver-copper-zinc-sulfur mixed concentrate includes the following steps:

[0077] S1 will add activated carbon to the ore for drug removal;

[0078] S2 grinds the mixed concentrate after de-doping to -0.043mm, accounting for 75%;

[0079] S3 adds inhibitors, collectors and frothers to the products after grinding to flotation separate silver-copper from zinc-sulfur to obtain silver-copper concentrate and zinc-sulfur concentrate;

[0080] S4 adds inhibitors, activators, collectors and frothers to the zinc-sulfur concentrate to separate zinc and sulfur to obtain zinc concentrate and sulfur concentrate.

[0081] The ore feeding is the same as that in Example 2. The specific reagent usage is shown in Table 3, and the specific indicators are shown in Table 6.

[0082] Comparative Example 3

[0083] The conventional beneficiation method of complex silver-copper-zinc-sulfur mixed concentrate includes the following steps:

[0084] S1 will add activated carbon to the ore for drug removal;

[0085] S2 grinds the mixed concentrate after de-doping to -0.043mm, accounting for 75%;

[0086] S3 adds inhibitors, collectors and frothers to the products after grinding to flotation separate silver-copper from zinc-sulfur to obtain silver-copper concentrate and zinc-sulfur concentrate;

[0087] S4 adds inhibitors, activators, collectors and frothers to the zinc-sulfur concentrate to separate zinc and sulfur to obtain zinc concentrate and sulfur concentrate.

[0088] The ore feeding is the same as that in Example 3. The specific reagent usage is shown in Table 4, and the specific indicators are shown in Table 6.

[0089] Comparative Example 4

[0090] The conventional beneficiation method of complex silver-copper-zinc-sulfur mixed concentrate includes the following steps:

[0091] S1 will add activated carbon to the ore for drug removal;

[0092] S2 grinds the mixed concentrate after demineralization to -0.043mm, accounting for 73%;

[0093] S3 adds inhibitors, collectors and frothers to the products after grinding to flotation separate silver-copper from zinc-sulfur to obtain silver-copper concentrate and zinc-sulfur concentrate;

[0094] S4 adds inhibitors, activators, collectors and frothers to the zinc-sulfur concentrate to separate zinc and sulfur to obtain zinc concentrate and sulfur concentrate.

[0095] The ore feeding is the same as that in Example 4. The specific reagent usage is shown in Table 4, and the specific indicators are shown in Table 6.

[0096] Table 1: The reagent usage of the ore dressing method of Examples 1 to 2

[0097]

[0098]

[0099] Table 2: Reagent usage of the ore dressing method of Examples 3 to 4

[0100]

[0101] Table 3 Comparative Examples 1 to 2 of the ore dressing method using reagents

[0102]

[0103] Table 4: The use of reagents in the mineral processing methods of comparative examples 3 to 4

[0104]

[0105]

[0106] The selection results of each embodiment are shown in Table 5, and the selection results of each comparative example are shown in Table 6.

[0107] Table 5 Selection results of various embodiments (%)

[0108]

[0109]

[0110] It can be seen from the above embodiments that the recovery method of the present invention can well recover the valuable elements of silver, copper, zinc and sulfur from the silver-copper-zinc-sulfur mixed concentrate. Specifically, in Example 1, the Ag grade of the silver-copper concentrate is 3967.9 g / t, the Ag recovery rate can reach 64.17%, the Cu grade is 18.16%, the Cu recovery rate is 62.36%, the Zn grade of the zinc concentrate is 42.74%, the Zn recovery rate is 89.08%, the S grade of the sulfur concentrate is 43.91%, and the S recovery rate is 85.14%; in Example 2, the Ag grade of the silver-copper concentrate is 4251.2 g / t, the Ag recovery rate can reach 67.39%, the Cu grade is 16.65%, the Cu recovery rate is 66.75%, the Zn grade of the zinc concentrate is 43.95%, and the Zn recovery rate is 91.68% , the S grade of the sulfur concentrate is 45.61%, and the S recovery rate is 78.49%; Example 3, the Ag grade of the silver-copper concentrate is 3857.8g / t, the Ag recovery rate can reach 71.72%, the Cu grade is 17.83%, the Cu recovery rate is 70.77%, the Zn grade of the zinc concentrate is 46.86%, the Zn recovery rate is 87.94%, the S grade of the sulfur concentrate is 46.81%, and the S recovery rate is 88.17%; Example 4, the Ag grade of the silver-copper concentrate is 5691.7g / t, the Ag recovery rate can reach 64.95%, the Cu grade is 19.24%, the Cu recovery rate is 68.56%, the Zn grade of the zinc concentrate is 45.72%, the Zn recovery rate is 90.93%, the S grade of the sulfur concentrate is 42.98%, and the S recovery rate is 82.08%.

[0111] Table 6 Selection results of each comparative example (%)

[0112]

[0113] The existing silver-copper-zinc-sulfur mixed concentrate beneficiation technology is: mixed concentrate demedication-silver-copper and zinc-sulfur separation-zinc-sulfur separation. 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 as follows: Comparative Example 1, the Ag grade of the silver-copper concentrate is 1438.5 g / t, the Ag recovery rate can reach 58.18%, the Cu grade is 6.93%, the Cu recovery rate is 58.01%, the Zn grade of the zinc concentrate is 36.51%, the Zn recovery rate is 82.02%, the S grade of the sulfur concentrate is 42.61%, and the S recovery rate is 76.75%; Comparative Example 2, the Ag grade of the silver-copper concentrate is 1615.2 g / t, the Ag recovery rate can reach 62.17%, the Cu grade is 6.15%, and the Cu recovery rate is 59.48%, The Zn grade of the zinc concentrate is 38.64%, the Zn recovery rate is 69.04%, the S grade of the sulfur concentrate is 41.85%, and the S recovery rate is 70.04%; in comparative example 3, the Ag grade of the silver-copper concentrate is 1305.2g / t, the Ag recovery rate can reach 63.43%, the Cu grade is 6.26%, the Cu recovery rate is 64.82%, the Zn grade of the zinc concentrate is 30.12%, the Zn recovery rate is 68.21%, the S grade of the sulfur concentrate is 46.26%, and the S recovery rate is 78.68%; in comparative example 4, the Ag grade of the silver-copper concentrate is 1705.6g / t, the Ag recovery rate can reach 60.46%, the Cu grade is 6.24%, the Cu recovery rate is 68.29%, the Zn grade of the zinc concentrate is 29.64%, the Zn recovery rate is 71.36%, the S grade of the sulfur concentrate is 42.16%, and the S recovery rate is 69.68%.

[0114] A comprehensive comparison shows that the indexes obtained by the method of the present invention are significantly higher than those obtained by the prior art, which is a significant improvement. Specifically, compared with the comparative example, the grade and recovery rate of the silver-copper concentrate, zinc concentrate and sulfur concentrate obtained by the present invention are significantly improved. In terms of indicators, the silver grade of the silver-copper concentrate obtained in Example 1 of the present invention is 2529.4 g / t higher than that of the comparative example 1, the copper grade is 11.23% higher, the silver recovery rate is 5.99% higher, the copper recovery rate is 4.35% higher, the zinc grade of the zinc concentrate is 6.23% higher, the zinc recovery rate is 7.06% higher, the sulfur grade of the sulfur concentrate is 1.30% higher, and the sulfur recovery rate is 8.39% higher; the silver grade of the silver-copper concentrate obtained in Example 2 is 2636.0 g / t higher than that of the comparative example 2, the copper grade is 10.50% higher, the silver recovery rate is 5.22% higher, the copper recovery rate is 7.27% higher, the zinc grade of the zinc concentrate is 5.31% higher, the zinc recovery rate is 22.64% higher, the sulfur grade of the sulfur concentrate is 3.76% higher, and the recovery rate is 8. 45%; the silver grade of the silver-copper concentrate obtained in Example 3 is 2552.6 g / t higher than that of Comparative Example 3, the copper grade is 11.57% higher, the silver recovery rate is 8.29% higher, the copper recovery rate is 5.95% higher, the zinc grade of the zinc concentrate is 16.74% higher, the zinc recovery rate is 19.73% higher, the grade of the sulfur concentrate is basically the same, and the sulfur recovery rate is 9.49% higher; the silver grade of the silver-copper concentrate obtained in Example 4 is 3986.1 g / t higher than that of Comparative Example 4, the copper grade is 13.00% higher, the silver recovery rate is 4.49% higher, the copper recovery rate is 0.27% higher, the zinc grade of the zinc concentrate is 16.08% higher, the zinc recovery rate is 19.57% higher, the grade of the sulfur concentrate is basically the same, and the sulfur recovery rate is 12.40% higher.

[0115] The above is a specific example embodiment of the present invention, and those skilled in the art may make several improvements and modifications without departing from the principles of the present invention. In fact, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate, characterized in that: The following steps are involved: S1 screens the ore to obtain a coarse-grained fraction and a fine-grained fraction; S2 adds inhibitor A to the coarse particle part and grinds the ore; S3: adding collector A to the product after grinding in step S2 to perform roughing; adding collector A to perform scavenging, adding inhibitor A to perform concentrating, and obtaining silver-copper concentrate and zinc-sulfur concentrate; S4 merges the zinc-sulfur concentrate into the fine-grained fraction to obtain zinc-sulfur separation feed ore; S5 adds inhibitor B to the zinc-sulfur separation feed ore and grinds the ore; S6 zinc-sulfur separation: add an activator, a collector B and a frother to the product after grinding obtained in step S5 for roughing, add a collector B for scavenging, add an inhibitor B for concentrating, and obtain zinc concentrate and sulfur concentrate.

2. The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate according to claim 1 is characterized in that: The particle size of the coarse particle size fraction in step S1 is +0.12 mm, and the particle size of the fine particle size fraction is -0.12 mm.

3. The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate according to claim 1 is characterized in that: In step S2 and step S3, the inhibitor A is a combination of two or three of lime, zinc sulfate, sodium sulfite, sodium humate and sodium thiosulfate; and the inhibitor B in step S5 is a combination of one or two of lime, sodium sulfite and sodium humate.

4. The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate according to claim 1 is characterized in that: The collector A in step S3 is a combination of two of Y89 xanthate, Z200, ethyl xanthate, ethyl dixanthate and ethyl thiocyanate; the collector B in step S6 is a combination of two of butyl xanthate, ethyl xanthate and ethyl thiocyanate.

5. The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate according to claim 1 is characterized in that: The activator in step S6 is copper sulfate; the foaming agent is methyl isobutyl carbinol.

6. The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate according to claim 1 is characterized in that: The dosage of the inhibitor A in step S2 is 4000 g / t to 6000 g / t.

7. The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate according to claim 1 is characterized in that: In the step S3, the amount of collector A used in the roughing selection is 20 g / t to 60 g / t; two sweeping selections are performed, and the amount of collector A used in the first sweeping selection is 6 g / t to 8 g / t; the amount of collector A used in the second sweeping selection is 4 g / t to 6 g / t; and the amount of inhibitor A used in the fine selection is 1000 g / t to 2000 g / t.

8. The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate according to claim 1 is characterized in that: In the step S6, the dosage of the activator during the roughing is 120 g / t to 200 g / t, the dosage of the collector B is 30 g / t to 60 g / t, and the dosage of the foaming agent is 2 g / t to 10 g / t; two sweeping selections are performed, and the dosage of the collector B during the first sweeping selection is 8 g / t to 12 g / t; the dosage of the collector B during the second sweeping selection is 6 g / t to 8 g / t; the dosage of the inhibitor B during the fine selection is 2000 g / t to 4000 g / t.

9. The ore dressing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver, copper, zinc and sulfur mixed concentrate according to claim 1, characterized in that: In step S2, grinding to -0.074 mm accounts for 80% to 85%; in step S5, grinding to -0.043 mm accounts for 70% to 75%.

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