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

Abstract

The present application relates to the technical field of mineral processing recovery, more particularly to a mineral processing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate. The mineral processing method provided by the present application comprises the following steps: feeding and screening, coarse-grained partial grinding, silver-copper-zinc-sulfur separation after grinding, zinc-sulfur concentrate merging into fine-grained partial grinding, zinc-sulfur separation after grinding, etc. The mineral processing method provided by the present application combines the special properties of the silver-copper-zinc-sulfur mixed concentrate, utilizes the floatability difference of sulfide minerals, adopts a process flow of hierarchical and step-by-step flotation enrichment, realizes efficient enrichment and separation of valuable minerals in the complex silver-copper-zinc-sulfur mixed concentrate, and effectively recovers silver, copper, zinc and sulfur in the complex silver-copper-zinc-sulfur mixed concentrate, with good separation effect and advanced indexes.

Description

Technical Field

[0001] This invention relates to the field of mineral processing and recovery technology, and more specifically, to a mineral processing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate. Background Technology

[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 sulfide minerals, so in nature, silver often occurs together with sulfide minerals to form complex polymetallic symbiotic minerals such as silver, copper, zinc and sulfur. In the beneficiation process, complex mixed concentrates of silver, copper, zinc and sulfur are usually produced, which are characterized by extremely uneven distribution of valuable mineral particles and low content of associated elements such as silver and copper. For a long time, there has been a lack of suitable beneficiation technology, which has led to the failure to effectively recover and utilize silver and copper. A large amount of valuable silver and copper resources are lost in zinc concentrate or sulfur concentrate, which not only affects the quality of 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 copper-zinc-sulfur concentrates. Ao Shunfu et al. (Experimental study and industrial application of lead-zinc mixed concentrate recovery from sulfur concentrate by flotation) [J]. Mineral Resources Conservation and Utilization, 2019, (02): 55-58. For a lead-zinc-containing sulfur concentrate in Yunnan, lime was used as a pyrite inhibitor, copper sulfate as a sphalerite activator, and DF-341 as a collector. The process flow was one roughing, two scavenging, and four cleaning processes after regrinding the rough concentrate. The fineness of the regrinded rough concentrate was -0.045 mm, accounting for 92%. A lead-zinc mixed concentrate with a yield of 3.16% and a combined lead and 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 Mineral Resources, 2017, (02): 40-45. For a copper-zinc mixed concentrate from a concentrator in Guangxi, an experiment was conducted using a regrinding-flotation separation process. The results showed that the combination of the novel inhibitor DT and zinc sulfate effectively removed copper ions from the slurry and efficiently inhibited zinc minerals. Under the conditions of a copper grade of 12.48% and a zinc grade of 12.75% in the mixed concentrate, a closed-circuit test was conducted, involving one roughing, two scavenging, and one cleaning process, resulting in a copper concentrate with a copper grade of 21.75% and a copper recovery rate of 68.54%, while the zinc grade decreased to 6.88%, achieving effective separation of copper and zinc. Liang Yiqiang et al. (Application of novel inhibitors in flotation separation of a lead-zinc-sulfur mixed concentrate) [J]. Mineral Resources Conservation and Utilization, 2020, (05): 109-115. A flotation separation experiment was conducted on a lead-zinc-sulfur mixed concentrate in Yunnan Province using novel inhibitors X33 and L3. After flotation separation of the lead-zinc-sulfur mixed concentrate containing 17.35% lead, 6.76% zinc and 31.04% iron, a lead concentrate containing 64.59% lead with a lead recovery rate of 95.49%, a silver content of 326.8 g / t with a silver recovery rate of 83.29% and a zinc content of 4.64% and a zinc concentrate containing 51.56% zinc with a zinc recovery rate of 64.09% and a lead content of 3.55% and a sulfur concentrate containing 43.4% sulfur with a sulfur recovery rate of 78.67%.

[0004] Current technologies lack economically viable beneficiation techniques for complex silver-copper-zinc-sulfur mixed concentrates. For such concentrates, the principle of copper-zinc-sulfur separation is typically employed. Existing beneficiation techniques generally involve: de-reagenting – grinding – silver-copper and zinc-sulfur separation – zinc-sulfur separation, producing low-grade silver-copper, zinc, and sulfur concentrates. Because the resulting mixed concentrate is treated with a large amount of sulfide reagents, the separation effect is poor, resulting in low-grade concentrates, low recovery rates, and low profitability. Therefore, it is urgent to develop an economically feasible and efficient beneficiation method for recovering silver, copper, zinc, and sulfur from complex silver-copper-zinc-sulfur mixed concentrates, achieving good separation effects and high-grade, high-recovery silver-copper, zinc, and sulfur concentrates. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from complex silver-copper-zinc-sulfur mixed concentrates. This invention achieves efficient enrichment and separation of valuable minerals in complex silver-copper-zinc-sulfur mixed concentrates. The mineral processing method of this invention ultimately yields high-grade silver-copper concentrate, zinc concentrate, and sulfur concentrate with high recovery rates. While obtaining high-grade silver-copper concentrate, it fully ensures the recovery of zinc and sulfur, achieving comprehensive resource recovery of silver, copper, zinc, and sulfur from the mixed concentrate. It features excellent separation performance and advanced technical and economic indicators.

[0006] The technical solution of this invention is:

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

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

[0009] S2 involves adding inhibitor A to the coarse-grained fraction and then grinding.

[0010] S3 Add collector A to the product after grinding in step S2 for roughing; add collector A for scavenging; add inhibitor A for cleaning to obtain silver-copper concentrate and zinc-sulfur concentrate.

[0011] S4 incorporates the zinc-sulfur concentrate into the fine-grained fraction to obtain a zinc-sulfur separation feed.

[0012] S5 is added to the zinc-sulfur separation feed and then ground.

[0013] S6 Zinc-Sulfur Separation: Add activator, collector B, and frother to the product obtained after grinding in step S5 for roughing, add collector B for scavenging, add inhibitor B for cleaning, and obtain zinc concentrate and sulfur concentrate.

[0014] Further, in step S1, the Ag grade of the feed 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 coarse-grained portion of step S1 has a particle size of +0.12 mm, and the fine-grained portion has a particle size of -0.12 mm.

[0016] Further, the inhibitor A in steps S2 and 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] Further, in step S3, the collector A is a combination of two of Y89 xanthate, Z200, ethyl xanthate, ethyl bixanthate, and ethyl thiocyanate; in step S6, the collector B is a combination of two of butyl xanthate, ethyl xanthate, and ethyl thiocyanate.

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

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

[0020] Further, in step S3, the amount of collector A used in the roughing process is 20 g / t to 60 g / t; two scavenging processes are performed, with the amount of collector A used in the first scavenging process being 6 g / t to 8 g / t and the amount of collector A used in the second scavenging process being 4 g / t to 6 g / t; and the amount of inhibitor A used in the finishing process is 1000 g / t to 2000 g / t.

[0021] Further, in step S6, the amount of activator used in the roughing process is 120g / t to 200g / t, the amount of collector B used is 30g / t to 60g / t, and the amount of frother used is 2g / t to 10g / t; two scavenging processes are performed, with the amount of collector B used in the first scavenging process being 8g / t to 12g / t and the amount of collector B used in the second scavenging process being 6g / t to 8g / t; and the amount of inhibitor B used in the finishing process is 2000g / t to 4000g / t.

[0022] Furthermore, 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%.

[0023] The most prominent feature of complex silver-copper-zinc-sulfur mixed concentrates is the variety of valuable minerals, with significant differences in the intergrowth and grain size of these minerals. Recovering silver, copper, zinc, and sulfur from these mixed concentrates requires the development of a reasonable and economically feasible technology, which places high demands on the combination of mineral processing technology and reagents.

[0024] This invention provides a mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from a complex mixed silver-copper-zinc-sulfur concentrate. Taking advantage of the significant differences in the particle size distribution of various valuable minerals in the mixed concentrate, screening and classification are employed. The coarse-grained fraction is ground to separate silver and copper from zinc and sulfur, achieving both a reduction in the silver-copper flotation feed rate and an increase in the grade of the silver-copper flotation feed, thereby improving the flotation effect and obtaining a higher-grade silver-copper concentrate. The zinc and sulfur concentrate is incorporated into the fine-grained fraction as a zinc-sulfur separation feed to increase the metal content of the zinc-sulfur separation feed. The zinc-sulfur separation feed is then regrinded to further separate zinc and sulfur, resulting in zinc concentrate and sulfur concentrate. The entire process ensures the recovery of zinc and sulfur while obtaining a high-grade silver-copper concentrate.

[0025] Currently, existing technologies lack economically viable beneficiation techniques for complex silver-copper-zinc-sulfur mixed concentrates. For these concentrates, the common practice is copper-zinc-sulfur separation. Existing beneficiation techniques typically involve: de-reagent processing – grinding – silver-copper and zinc-sulfur separation – zinc-sulfur separation, producing low-grade silver-copper, zinc, and sulfur concentrates. Because the resulting mixed concentrate is subjected to a large amount of sulfide reagents, the separation effect is poor, resulting in low-grade concentrates, low recovery rates, and low economic benefits. The beneficiation method provided by this invention, taking into account the unique properties of silver-copper-zinc-sulfur mixed concentrates, utilizes the differences in floatability of sulfide minerals and employs a staged, stepwise flotation enrichment process. This achieves efficient enrichment and separation of valuable minerals in complex silver-copper-zinc-sulfur mixed concentrates, effectively recovering silver, copper, zinc, and sulfur from the concentrates. The separation effect is excellent, and the indicators are advanced.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] (1) This invention screens and classifies complex silver-copper-zinc-sulfur mixed concentrates and uses separate coarse and fine grinding to achieve efficient separation of silver, copper, zinc and sulfur. It obtains high-grade silver-copper concentrate, zinc concentrate and sulfur concentrate from complex silver-copper-zinc-sulfur mixed concentrates, which significantly improves the separation index.

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

[0029] (3) This invention utilizes screening and grading-coarse and fine grinding separation technology to efficiently separate silver, copper, zinc and sulfur in complex silver-copper-zinc-sulfur mixed concentrate, thereby realizing the high-quality utilization of silver-copper-zinc-sulfur mixed concentrate. Attached Figure Description

[0030] Figure 1 This is a process flow diagram of the mineral processing method for efficiently recovering silver, copper, zinc and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate in Examples 1-4 of the present invention. Detailed Implementation

[0031] The present invention is further illustrated below with reference to specific embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions in the art or as recommended by the manufacturer; the raw materials and reagents used, unless otherwise specified, are all commercially available from the conventional market. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention are within the scope of protection claimed by the present invention.

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

[0033] The mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from complex silver-copper-zinc-sulfur mixed concentrates, such as... Figure 1 Specifically, it includes the following steps:

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

[0035] S2 is added to the coarse-grained fraction with a particle size of +0.12mm, and then ground until -0.074mm accounts 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 and perform two scavenging processes; add inhibitor A and perform two to three cleaning processes to obtain silver-copper concentrate and zinc-sulfur concentrate.

[0037] S4 incorporates the zinc-sulfur concentrate into the fine-grained fraction with a particle size of -0.12 mm, thus obtaining a zinc-sulfur separated feed.

[0038] S5 is fed with inhibitor B to the zinc-sulfur separation feed, and then ground to a final thickness of -0.043 mm (70%).

[0039] S6 Zinc-Sulfur Separation: Add an activator to the product obtained after grinding 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 scavenging processes, add inhibitor B, and perform three to four cleaning processes to 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 from Inner Mongolia, with an Ag grade of 178.7 g / t, a Cu grade of 0.84%, a Zn grade of 8.11%, and a S grade of 41.36%. The specific indicators are shown in Table 5.

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

[0042] The mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from complex silver-copper-zinc-sulfur mixed concentrates, such as... Figure 1 Specifically, it includes the following steps:

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

[0044] S2 is added to the coarse-grained fraction with a particle size of +0.12mm, and then ground until -0.074mm accounts 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 and perform two scavenging processes; add inhibitor A and perform two to three cleaning processes to obtain silver-copper concentrate and zinc-sulfur concentrate.

[0046] S4 incorporates the zinc-sulfur concentrate into the fine-grained fraction with a particle size of -0.12 mm, thus obtaining a zinc-sulfur separated feed.

[0047] S5 is fed with inhibitor B to the zinc-sulfur separation feed, and then ground to a final thickness of -0.043 mm (75%).

[0048] S6 Zinc-Sulfur Separation: Add an activator to the product obtained after grinding 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 scavenging processes, add inhibitor B, and perform three to four cleaning processes to 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 from Jiangxi Province, with an Ag grade of 249.2 g / t, a Cu grade of 0.99%, a Zn grade of 11.59%, and a S grade of 41.76%. The specific indicators are shown in Table 5.

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

[0051] The mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from complex silver-copper-zinc-sulfur mixed concentrates, such as... Figure 1 Specifically, it includes the following steps:

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

[0053] S2 is added to the coarse-grained fraction with a particle size of +0.12mm, and then ground until -0.074mm accounts 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 and perform two scavenging processes; add inhibitor A and perform two to three cleaning processes to obtain silver-copper concentrate and zinc-sulfur concentrate.

[0055] S4 incorporates the zinc-sulfur concentrate into the fine-grained fraction with a particle size of -0.12 mm, thus obtaining a zinc-sulfur separated feed.

[0056] S5 is fed with inhibitor B to the zinc-sulfur separation feed, and then ground to a final thickness of -0.043 mm (75%).

[0057] S6 Zinc-Sulfur Separation: Add an activator to the product obtained after grinding 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 scavenging processes, add inhibitor B, and perform three to four cleaning processes to 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 Province, with an Ag grade of 169.4 g / t, a Cu grade of 0.79%, a Zn grade of 7.43%, and a S grade of 44.02%. The specific indicators are shown in Table 5.

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

[0060] The mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from complex silver-copper-zinc-sulfur mixed concentrates, such as... Figure 1 Specifically, it includes the following steps:

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

[0062] S2 is added to the coarse-grained fraction with a particle size of +0.12mm, and then ground until -0.074mm accounts 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 and perform two scavenging processes; add inhibitor A and perform two to three cleaning processes to obtain silver-copper concentrate and zinc-sulfur concentrate.

[0064] S4 incorporates the zinc-sulfur concentrate into the fine-grained fraction with a particle size of -0.12 mm, thus obtaining a zinc-sulfur separated feed.

[0065] S5 is fed with inhibitor B to the zinc-sulfur separation feed, and then ground to a final thickness of -0.043 mm (73%).

[0066] S6 Zinc-Sulfur Separation: Add an activator to the product obtained after grinding 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 scavenging processes, add inhibitor B, and perform three to four cleaning processes to 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 from Guangxi, with an Ag grade of 259.4 g / t, a Cu grade of 0.83%, a Zn grade of 9.84%, and a S grade of 40.57%. The specific indicators are shown in Table 5.

[0068] Comparative Example 1

[0069] Conventional beneficiation methods for complex silver-copper-zinc-sulfur mixed concentrates include the following steps:

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

[0071] S2 grinds the de-treated mixed concentrate to a final thickness of -0.043 mm (70%).

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

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

[0074] The ore feed was the same as in Example 1. Specific reagent usage for the separation process is shown in Table 3, and specific indicators are shown in Table 6.

[0075] Comparative Example 2

[0076] Conventional beneficiation methods for complex silver-copper-zinc-sulfur mixed concentrates include the following steps:

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

[0078] S2 grinds the de-treated mixed concentrate to a final thickness of -0.043 mm (75%).

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

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

[0081] The ore feed was the same as in Example 2. Specific reagent usage for the separation process is shown in Table 3, and specific indicators are shown in Table 6.

[0082] Comparative Example 3

[0083] Conventional beneficiation methods for complex silver-copper-zinc-sulfur mixed concentrates include the following steps:

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

[0085] S2 grinds the de-treated mixed concentrate to a final thickness of -0.043 mm (75%).

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

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

[0088] The ore feed was the same as in Example 3. Specific reagent usage for the separation process is shown in Table 4, and specific indicators are shown in Table 6.

[0089] Comparative Example 4

[0090] Conventional beneficiation methods for complex silver-copper-zinc-sulfur mixed concentrates include the following steps:

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

[0092] S2 grinds the de-treated mixed concentrate to a thickness of -0.043 mm, which accounts for 73%;

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

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

[0095] The ore feed was the same as in Example 4. Specific reagent usage for the separation process is shown in Table 4, and specific indicators are shown in Table 6.

[0096] Table 1. Reagent usage in the mineral processing methods of Examples 1-2

[0097]

[0098]

[0099] Table 2. Reagent usage in the mineral processing methods of Examples 3-4

[0100]

[0101] Table 3. Reagent usage in the mineral processing methods of Comparative Examples 1 and 2

[0102]

[0103] Table 4 shows the reagent usage in the mineral processing methods of Comparative Examples 3-4.

[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 (%) for each embodiment

[0108]

[0109]

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

[0111] Table 6. Selection results (%) for each pair of proportions

[0112]

[0113] The existing beneficiation technology for mixed silver-copper-zinc-sulfur concentrates is as follows: mixed concentrate de-reagent treatment – ​​silver-copper and zinc-sulfur separation – zinc-sulfur separation. Comparative Examples 1, 2, 3, and 4 were processed using the existing technology with the raw ore from Examples 1, 2, 3, and 4. The corresponding experimental indicators obtained are as follows: Comparative Example 1: Silver-copper concentrate Ag grade 1438.5 g / t, Ag recovery rate up to 58.18%; Cu grade 6.93%, Cu recovery rate 58.01%; Zinc concentrate Zn grade 36.51%, Zn recovery rate 82.02%; Sulfur concentrate S grade 42.61%, S recovery rate 76.75%; Comparative Example 2: Silver-copper concentrate Ag grade 1615.2 g / t, Ag recovery rate up to 62.17%; Cu grade 6.15%, Cu recovery rate 59.48%. The zinc concentrate had a Zn grade of 38.64% and a Zn recovery rate of 69.04%, while the sulfur concentrate had a S grade of 41.85% and a S recovery rate of 70.04%. Comparative Example 3 showed that the silver-copper concentrate had an Ag grade of 1305.2 g / t with an Ag recovery rate of 63.43%, a Cu grade of 6.26% with a Cu recovery rate of 64.82%, a Zn grade of 30.12% with a Zn recovery rate of 68.21%, and a S grade of 46.26% with a S recovery rate of 78.68%. Comparative Example 4 showed that the silver-copper concentrate had an Ag grade of 1705.6 g / t with an Ag recovery rate of 60.46%, a Cu grade of 6.24% with a Cu recovery rate of 68.29%, a Zn grade of 29.64% with a Zn recovery rate of 71.36%, and a S grade of 42.16% with a S recovery rate of 69.68%.

[0114] A comprehensive comparison reveals that the indicators obtained using the method of this invention are significantly higher than those obtained using existing technologies, demonstrating substantial progress. Specifically, compared with the comparative examples, the grades and recoveries of silver-copper concentrate, zinc concentrate, and sulfur concentrate obtained by this invention are significantly improved. In terms of indicators, the silver grade of the silver-copper concentrate obtained in Example 1 of this invention is 2529.4 g / t higher than that in 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, and the sulfur grade of the sulfur concentrate is 1.30% higher, with a sulfur recovery rate of 8.39%. The silver-copper concentrate obtained in Example 2 has a silver grade of 2636.0 g / t higher than that in 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, and the sulfur grade of the sulfur concentrate is 3.76% higher, with a recovery rate of 8%. 45%; The silver grade of the silver-copper concentrate obtained in Example 3 was 2552.6 g / t higher than that in Comparative Example 3, the copper grade was 11.57% higher, the silver recovery rate was 8.29% higher, and the copper recovery rate was 5.95% higher. The zinc grade of the zinc concentrate was 16.74% higher, and the zinc recovery rate was 19.73% higher. The sulfur concentrate grade was basically the same, and the sulfur recovery rate was 9.49% higher. The silver grade of the silver-copper concentrate obtained in Example 4 was 3986.1 g / t higher than that in Comparative Example 4, the copper grade was 13.00% higher, the silver recovery rate was 4.49% higher, and the copper recovery rate was 0.27% higher. The zinc grade of the zinc concentrate was 16.08% higher, and the zinc recovery rate was 19.57% higher. The sulfur concentrate grade was basically the same, and the sulfur recovery rate was 12.40% higher.

[0115] The above description represents specific exemplary embodiments of the present invention. Those skilled in the art can make various modifications and alterations without departing from the principles of the invention. In fact, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate, characterized in that, Includes the following steps: S1 will screen the ore to obtain a coarse-grained fraction and a fine-grained fraction; S2 involves adding inhibitor A to the coarse-grained fraction and then grinding. S3 Add collector A to the product after grinding in step S2 for roughing; add collector A for scavenging; add inhibitor A for cleaning to obtain silver-copper concentrate and zinc-sulfur concentrate. S4 incorporates the zinc-sulfur concentrate into the fine-grained fraction to obtain a zinc-sulfur separation feed. S5 is added to the zinc-sulfur separation feed and then ground. S6 Zinc-Sulfur Separation: Add activator, collector B, and frother to the product obtained after grinding in step S5 for roughing, add collector B for scavenging, add inhibitor B for cleaning, and obtain zinc concentrate and sulfur concentrate.

2. The mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate according to claim 1, characterized in that, The coarse-grained portion of step S1 has a particle size of +0.12 mm, and the fine-grained portion has a particle size of -0.12 mm.

3. The mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate according to claim 1, 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; in step S5, the inhibitor B is a combination of one or two of lime, sodium sulfite, and sodium humate.

4. The mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate according to claim 1, characterized in that, In step S3, the collector A is a combination of two of Y89 xanthate, Z200, ethyl xanthate, ethyl bixanthate, and ethylthiocyanate acrylonitrile; in step S6, the collector B is a combination of two of butyl xanthate, ethyl xanthate, and ethylthiocyanate acrylonitrile.

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

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

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

8. The mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from a complex silver-copper-zinc-sulfur mixed concentrate according to claim 1, characterized in that, In step S6, during the roughing process, the amount of activator is 120 g / t to 200 g / t, the amount of collector B is 30 g / t to 60 g / t, and the amount of frother is 2 g / t to 10 g / t. Two scavenging processes are performed: during the first scavenging process, the amount of collector B is 8 g / t to 12 g / t; during the second scavenging process, the amount of collector B is 6 g / t to 8 g / t. During the finishing process, the amount of inhibitor B is 2000 g / t to 4000 g / t.

9. The mineral processing method for efficiently recovering silver, copper, zinc, and sulfur from a complex silver-copper-zinc-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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