A beneficiation method for recovering silver, copper and zinc sulfide from a complex shaker

Abstract

The present application belongs to the technical field of mineral processing recovery, and particularly relates to a mineral processing method for recovering silver, copper and zinc sulfur from complex shaking table middlings. The mineral processing method provided by the present application comprises processes such as grinding, silver-copper-sulfur floatation, silver-copper separation, zinc-sulfur mixed floatation and zinc-sulfur separation. The mineral processing method provided by the present application combines the special properties of complex shaking table middlings, utilizes the floatability difference of sulfide minerals, adopts a step-by-step floatation enrichment process, realizes efficient enrichment and separation of valuable minerals in complex shaking table middlings, and effectively recovers silver, copper, zinc and sulfur in the ore. Moreover, the present application has low reagent consumption in the recovery process, good separation effect, and lays a solid foundation for the large-scale recovery of silver, copper, zinc and sulfur.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mineral processing and recovery, and particularly relates to a mineral processing method for recovering silver, copper, zinc and sulfur from complex table concentrate. BACKGROUND

[0002] Silver has been a precious metal since ancient times and has been used as hard currency for a long time. With the rapid development of science and technology, silver has been more widely used due to its excellent stability, electrical conductivity and other special properties. Since silver has strong affinity for sulfur, it is often associated with sulfide minerals in nature, forming complex polymetallic intergrowth ores such as silver, copper, zinc and sulfur. Silver-tin intergrowth ores have complex intergrowth and extremely uneven embedded particle size, and the silver, copper, zinc and sulfur minerals in the ores are usually recovered by stage grinding and stage separation process in the mineral processing process, often producing concentrates rich in valuable elements such as silver, copper, zinc and sulfur. However, there is no suitable mineral processing technology for the complex table concentrate, resulting in a large amount of valuable elements not being effectively recovered and utilized, and a large amount of valuable silver, copper, zinc and sulfur resources being lost.

[0003] There have been research reports on tin polymetallic ore processing and the recovery technology of table concentrate produced thereby. For example, due to the decline in the quality of raw ore, the original middlings system of Chehe Concentrator has problems such as low feed grade, high iron content, poor effect of gravity concentration enrichment, and the like, which affects the efficiency of the concentrator. To solve the above problems, the existing technology optimizes the process flow, reduces the iron content of the middlings table feed, and improves the efficiency of the flotation operation by increasing the spiral chute shunt to separate the 6# mill discharge of the mixed feed in the original middlings system, adding a two-chamber rough concentrate of the sawtooth wave jig, installing a magnetic separator to pre-remove iron from the table feed, and increasing the diameter of the grinding medium. The production practice results show that after the transformation, the tin metal recovery rate of the middlings system is increased from 4.13% before the transformation to 5.10%, the quality of the tin concentrate is increased from 78.63% to 85.47%, and the economic benefits of the concentrator are increased by 6.56 million yuan per year. However, the feed of this mineral processing method is the middlings of Chehe Concentrator, and the main component of the middlings is tin, so the composition is relatively simple, making the recovery process relatively simple.

[0004] Part of the prior art by process mineralogy analysis of a certain tungsten-containing crude tin material, the test scheme is drawn up, and the desulfurization, deironing and deimpurity are carried out, and tungsten-tin mixed concentrate is produced, and the tungsten-tin mixed concentrate is subjected to flotation and hydrometallurgical test research, and effective separation of tungsten and tin is realized, and qualified tungsten, tin concentrate, sulfur concentrate and iron coarse concentrate are produced. According to the tailings resource of the tailings pond of Yunnan Tin Company, from the analysis of the properties of the tailings test material, combined with the process research and production practice experience of tailings beneficiation test, the old tailings of a tailings pond are pre-classified, sand and mud are separated, through the exploratory test research of classified sand setting, magnetic separation, rotary spiral chute pre-separation, table gravity separation and the like, finally, a process flow of pre-classification by a Φ250mm cyclone, twice grinding of sand setting, twice selection by a table, pre-separation by a classified overflow centrifuge and fine separation by a belt chute is adopted. The test obtains a selected test material containing 0.18% of tin, produces a coarse tin concentrate containing 8.60% of tin by sand setting, and the tin recovery rate is 41.12%; produces a rich middling containing 5.56% of tin by mud ore, and the tin recovery rate is 5.22%. The feed of the two methods is not middling, and the main components are completely different.

[0005] Chinese patent application CN110404690A discloses a method for recovering independent silver minerals from silver-tin intergrowth ore, the research object is silver-tin intergrowth ore, first, the ore is ground to below 15mm, then pre-screening is carried out by using high-frequency vibration screen, to obtain ore below 0.2mm and ore above 0.2mm, the ore above 0.2mm is returned to grinding, and the cycle is repeated, to obtain ore below 0.2mm, the 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 into subsequent cassiterite separation. The feed of this method is silver-tin intergrowth ore, the main components are silver and tin, therefore, in the recovery process, substances are mainly added for these two metals, and silver, copper and zinc sulfur cannot be recovered at the same time.

[0006] Therefore, it is of important application value to develop an economic and reasonable beneficiation technology for recovering silver, copper, zinc and sulfur from complex table middlings. SUMMARY

[0007] In view of the problem that the prior art lacks a reasonable recovery technology for silver, copper, zinc and sulfur resources in complex table middlings, the present application provides a beneficiation method for recovering silver, copper, zinc and sulfur from complex table middlings. The present application recovers silver-copper concentrate, zinc concentrate, sulfur concentrate and floating sulfur tailings, realizes the comprehensive recovery of silver, copper, zinc and sulfur resources in complex table middlings, creates favorable conditions for subsequent cassiterite separation, and has the characteristics of short process flow, low reagent consumption and advanced technical and economic indicators.

[0008] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0009] A beneficiation method for recovering silver, copper, zinc and sulfur from complex table middlings, comprising the following steps:

[0010] S1. Grind the raw ore to obtain the ground product;

[0011] S2. Silver-copper-sulfur flotation: Add inhibitors to the grinding product obtained in step S1, add collectors for roughing and scavenging, and then add inhibitors for cleaning to obtain silver-copper-sulfur mixed concentrate and equal flotation tailings.

[0012] S3. Grind the silver-copper-sulfur mixed concentrate obtained in step S2 to obtain the ground silver-copper-zinc-sulfur mixed concentrate;

[0013] S4. Separation of silver and copper from sulfur by flotation: Add inhibitors to the silver-copper-zinc-sulfur mixed concentrate obtained after grinding in step S3, add collectors for roughing and scavenging, and then add inhibitors for cleaning to obtain silver-copper concentrate and sulfur concentrate 1.

[0014] S5. Zinc-sulfur mixed flotation: Add activator, collector and frother to the equal flotation tailings obtained in step S2 for roughing, add collector for scavenging, and then clean to obtain zinc-sulfur mixed concentrate and sulfur tailings.

[0015] S6. Add inhibitor to the zinc-sulfur mixed concentrate obtained in step S5 and grind it to obtain the ground zinc-sulfur mixed concentrate.

[0016] S7. Zinc-sulfur separation: Add an activator to the zinc-sulfur mixed concentrate obtained after grinding in step S6, then add a collector for roughing and scavenging, and then add an inhibitor for cleaning to obtain zinc concentrate and sulfur concentrate 2.

[0017] The most significant characteristic of associated silver, copper, zinc, and sulfur in complex shaking table middlings is that while there are many types of valuable minerals, their content is low and their particle size is fine. Subsequent cassiterite beneficiation restricts the particle size of the sulfide ore entering the beneficiation process. At the same time, it is required that the interference of sulfide ore beneficiation reagents on cassiterite beneficiation be minimized. Therefore, the recovery of silver, copper, zinc, and sulfur from complex shaking table middlings requires the development of a reasonable and economically feasible technology, which places high demands on the beneficiation process.

[0018] For complex shaking table ore, the current mineral processing technology is usually as follows: grinding and flotation of mixed sulfide ore to produce mixed sulfide ore concentrate, and feeding the flotation tailings into cassiterite for separation. The obtained mixed sulfide ore concentrate is affected by a large amount of sulfide ore reagents, resulting in poor separation effect, low grade of concentrate, or even inability to separate, and poor efficiency.

[0019] To address the aforementioned challenges, this invention provides a mineral processing method for recovering silver, copper, zinc, and sulfur from complex shaking table ore. Combining the unique properties of silver, copper, zinc, and sulfur in complex shaking table ore with the requirements of cassiterite beneficiation, the method employs staged grinding and staged beneficiation. Silver, copper, and sulfur can be floated, ensuring the full recovery of high-value silver and copper. Furthermore, the method intensifies the removal of zinc and sulfur minerals, ensuring that zinc and sulfur are removed while simultaneously facilitating their separation. Simultaneously, the main process does not introduce lime, avoiding serious interference with subsequent cassiterite beneficiation.

[0020] Preferably, in step S1, the product after grinding has an Ag grade of 9.8 g / t to 24.3 g / t, a Cu grade of 0.05% to 0.11%, a Zn grade of 0.38% to 0.55%, and a S grade of 1.41% to 2.43%.

[0021] In the process provided by this invention, after grinding in step S2, an inhibitor is added to suppress zinc-sulfur minerals, thereby separating silver-copper-sulfur minerals from zinc-sulfur minerals to obtain silver-copper-sulfur concentrate; in step S4, an inhibitor is added to suppress sulfur minerals, obtaining silver-copper concentrate and sulfur concentrate 1; in step S5, an activator and a collector are added to the silver-copper tailings to activate and collect the suppressed zinc-sulfur minerals, obtaining a mixed zinc-sulfur concentrate; in steps S6 / S7, an activator and a collector are added to separate zinc and sulfur, obtaining zinc concentrate and sulfur concentrate. Through stepwise isoflotation and regrinding for efficient flotation separation, various valuable sulfide minerals in the ore from the complex shaking table are effectively recovered.

[0022] Preferably, the amount of inhibitor added to the product after grinding in step S2 is 2000g / t to 4000g / t, and the amount of inhibitor added after scavenging is 200g / t to 600g / t. The inhibitor is selected from any two of sodium carbonate, zinc sulfate, and sodium sulfite.

[0023] Preferably, the specific process of roughing and scavenging with the collector in step S2 is as follows: add 80g / t to 120g / t of collector, stir for 2min to 3min for roughing, add 20g / t to 30g / t of collector for scavenging, add 10g / t to 15g / t of collector for scavenging; the collector is selected from one or two of butyl ammonium black powder, Z200, ethyl xanthate, and ethyl bixanthate.

[0024] Preferably, the amount of inhibitor added to the silver-copper-sulfur mixed concentrate after grinding in step S4 is 300g / t to 600g / t, and the amount of inhibitor added after scavenging is 60g / t to 120g / t; the inhibitor is selected from one or two of lime, sodium humate, and sodium sulfite.

[0025] Preferably, the specific process of adding the collector for roughing and scavenging in step S4 is as follows: 3g / t to 6g / t of collector, stirring for 2min to 3min for roughing, adding 0.5g / t to 1g / t of collector for the first scavenging, and adding 0.3g / t to 0.5g / t of collector for the second scavenging; the collector is selected from one or two of Y89 xanthate and Z200.

[0026] Preferably, the amount of activator added in step S5 is 100g / t to 800g / t; the amount of collector added during stirring is 120g / t to 160g / t; the amount of frother added is 15g / t to 25g / t; the process of adding the collector for scavenging is as follows: add 20g / t to 30g / t of collector for one scavenging, add 10g / t to 20g / t of collector for a second scavenging; the activator in step S5 is selected from one or two of copper sulfate and oxalic acid, the collector is selected from one or two of butyl xanthate and ethyl xanthate, and the frother is selected from one of pine oil and methyl isobutyl methanol.

[0027] Preferably, the amount of inhibitor added in step S6 is 400g / t to 800g / t, and the inhibitor is selected from one or two of lime and sodium humate.

[0028] Preferably, the amount of activator added in step S7 is 10 g / t to 15 g / t, and the activator is copper sulfate; the amount of inhibitor added after scavenging is 100 g / t to 200 g / t; the inhibitor is selected from one or two of lime, sodium humate, and sodium sulfite.

[0029] Preferably, the specific process of adding collectors for roughing and scavenging in step S7 is as follows: add 3g / t to 5g / t of collectors, stir for 2min to 3min for roughing, add 1g / t to 2g / t of collectors for the first scavenging, and add 0.4g / t to 0.8g / t of collectors for the second scavenging.

[0030] Compared with the prior art, the technical advantages of the present invention are as follows:

[0031] (1) Under the condition of staged grinding and beneficiation, the present invention adopts the staged flotation method to efficiently separate silver, copper, zinc and sulfur, and obtains silver-copper concentrate, zinc concentrate and sulfur concentrate and other concentrate products from complex shaking table ore, which effectively improves the indicators, realizes efficient recovery of silver, copper, zinc and sulfur from complex shaking table ore, and creates good conditions for subsequent cassiterite beneficiation.

[0032] (2) The whole process is compact and conducive to industrialization: This invention utilizes staged grinding-step flotation technology to separate silver, copper, zinc and sulfur through efficient flotation after regrinding, realizing the resource recovery of silver, copper, zinc and sulfur in ore from complex shaking tables. Attached Figure Description

[0033] Figure 1 This is a process flow diagram of the mineral processing method of the present invention. Detailed Implementation

[0034] 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.

[0035] The existing complex shaking table ore beneficiation technology for silver, copper, zinc and sulfur is as follows: mixed flotation of sulfide ore - de-reagenting of mixed concentrate - separation of silver and copper from zinc and sulfur - separation of zinc and sulfur. Therefore, Comparative Examples 1, 2, 3 and 4 use the existing technology to process the feed of Examples 1, 2, 3 and 4.

[0036] Example 1: A mineral processing method for recovering silver, copper, zinc, and sulfur from ore from a complex shaking table.

[0037] The sample was selected from a complex shaking table medium ore containing silver, copper, zinc and sulfur in Inner Mongolia. The main valuable minerals are cassiterite, chalcopyrite, chalcopyrite and argentite, etc. The Ag grade is 15.6 g / t, the Cu grade is 0.08%, the Zn grade is 0.42% and the S grade is 1.78%.

[0038] The mineral processing method includes the following steps:

[0039] S1. Grind the raw ore until 80% is below 0.074mm to obtain the ground product;

[0040] S2. Silver-copper-sulfur flotation: Add inhibitor to the product after grinding obtained in step S1 and stir for 3 minutes. Then continue to add collector for roughing and scavenging. After scavenging, add inhibitor and perform 2 to 3 cleaning processes to obtain silver-copper-sulfur mixed concentrate and equal flotation tailings.

[0041] S3 grinds the silver-copper-sulfur mixed concentrate obtained in step S2 until 85% of the concentrate is below 0.043 mm in diameter, and obtains the ground silver-copper-zinc-sulfur mixed concentrate.

[0042] S4. Separation of silver-copper and sulfur by flotation: Add inhibitor to the silver-copper-sulfur mixed concentrate obtained after grinding in step S3 and stir for 2 minutes. Then add collector for roughing and scavenging. After scavenging, add inhibitor and perform 2 to 3 cleaning processes to obtain silver-copper concentrate and sulfur concentrate 1.

[0043] S5. Zinc-sulfur mixed flotation: Add an activator to the equal flotation tailings obtained in step S2 and stir for 3 minutes, then add a collector and stir for 3 minutes, add a frother for roughing, add a collector for scavenging, and continue to perform 2 to 3 cleaning processes to obtain zinc-sulfur mixed concentrate and sulfur tailings.

[0044] S6. Add inhibitors to the zinc-sulfur mixed concentrate obtained in step S5 and grind it until 80% of the concentrate is below 0.043 mm to obtain the ground zinc-sulfur mixed concentrate.

[0045] S7. Zinc-sulfur separation: Add an activator to the milled zinc-sulfur mixed concentrate obtained in step S6 and stir for 3 minutes. Then add a collector for roughing and scavenging. Continue adding a depressant and perform 3-4 cleaning cycles to obtain zinc concentrate and sulfur concentrate 2.

[0046] The specific details of the drug usage are shown in Table 1.

[0047] Example 2: A mineral processing method for recovering silver, copper, zinc, and sulfur from ore from a complex shaking table.

[0048] The sample was selected from a complex shaking table ore containing silver, copper, zinc and sulfur in Yunnan. The main valuable minerals are cassiterite, chalcopyrite, sphalerite, argentite, and chalcopyrite. The Ag grade is 18.3 g / t, the Cu grade is 0.07%, the Zn grade is 0.38%, and the S grade is 2.43%.

[0049] The mineral processing method includes the following steps:

[0050] S1. Grind the raw ore until 70% is below 0.074mm to obtain the ground product;

[0051] S2. Silver-copper-sulfur flotation: Add inhibitor to the product after grinding obtained in step S1 and stir for 3 minutes. Then continue to add collector for roughing and scavenging. After scavenging, add inhibitor and perform 2 to 3 cleaning processes to obtain silver-copper-sulfur mixed concentrate and equal flotation tailings.

[0052] S3 grinds the silver-copper-sulfur mixed concentrate obtained in step S2 until 75% of the concentrate is below 0.043 mm in diameter, and obtains the ground silver-copper-zinc-sulfur mixed concentrate.

[0053] S4. Separation of silver, copper and sulfur by flotation: Add inhibitor to the silver-copper-sulfur mixed concentrate obtained after grinding in step S3 and stir for 3 minutes. Then add collector for roughing and scavenging. After scavenging, add inhibitor and perform 2 to 3 cleaning processes to obtain silver-copper concentrate and sulfur concentrate 1.

[0054] S5. Zinc-sulfur mixed flotation: Add an activator to the equal flotation tailings obtained in step S2 and stir for 3 minutes, then add a collector and stir for 3 minutes, add a frother for roughing, add a collector for scavenging, and continue to perform 2-3 blank cleanings without reagents to improve the concentrate grade and obtain zinc-sulfur mixed concentrate and sulfur tailings.

[0055] S6. Add inhibitors to the zinc-sulfur mixed concentrate obtained in step S5 and grind it until 75% of the concentrate is below 0.043 mm to obtain the ground zinc-sulfur mixed concentrate.

[0056] S7. Zinc-sulfur separation: Add an activator to the milled zinc-sulfur mixed concentrate obtained in step S6 and stir for 3 minutes. Then add a collector for roughing and scavenging. Continue adding a depressant and perform 3-4 cleaning cycles to obtain zinc concentrate and sulfur concentrate 2.

[0057] The specific drugs used are shown in Table 1.

[0058] Example 3: A mineral processing method for recovering silver, copper, zinc, and sulfur from ore from a complex shaking table.

[0059] The sample was selected from a complex shaking table ore containing silver, copper, zinc and sulfur in Hunan Province. The main valuable minerals are cassiterite, chalcopyrite, sphalerite, argentite, and chalcopyrite. The Ag grade is 24.3 g / t, the Cu grade is 0.05%, the Zn grade is 0.44%, and the S grade is 1.73%.

[0060] The mineral processing method includes the following steps:

[0061] S1. Grind the raw ore until 75% of it is below 0.074mm to obtain the ground product;

[0062] S2. Silver-copper-sulfur flotation: Add inhibitor to the product after grinding obtained in step S1 and stir for 3 minutes. Then continue to add collector for roughing and scavenging. After scavenging, add inhibitor and perform 2 to 3 cleaning processes to obtain silver-copper-sulfur mixed concentrate and equal flotation tailings.

[0063] S3 grinds the silver-copper-sulfur mixed concentrate obtained in step S2 until 80% of the concentrate is below 0.043 mm in diameter, and obtains the ground silver-copper-zinc-sulfur mixed concentrate.

[0064] S4. Separation of silver, copper and sulfur by flotation: Add inhibitor to the silver-copper-sulfur mixed concentrate obtained after grinding in step S3 and stir for 3 minutes. Then add collector for roughing and scavenging. After scavenging, add inhibitor and perform 2 to 3 cleaning processes to obtain silver-copper concentrate and sulfur concentrate 1.

[0065] S5. Zinc-sulfur mixed flotation: Add an activator to the equal flotation tailings obtained in step S2 and stir for 3 minutes, then add a collector and stir for 3 minutes, add a frother for roughing, add a collector for scavenging, and continue to perform 2 to 3 cleaning processes to obtain zinc-sulfur mixed concentrate and sulfur tailings.

[0066] S6. Add inhibitor to the zinc-sulfur mixed concentrate obtained in step S5 and grind it until 78% of the concentrate is below 0.043 mm to obtain the ground zinc-sulfur mixed concentrate.

[0067] S7. Zinc-sulfur separation: Add an activator to the milled zinc-sulfur mixed concentrate obtained in step S6 and stir for 3 minutes. Then add a collector for roughing and scavenging. Continue adding a depressant and perform 3-4 cleaning cycles to obtain zinc concentrate and sulfur concentrate 2.

[0068] The specific drugs used are shown in Table 2.

[0069] Example 4: A mineral processing method for recovering silver, copper, zinc, and sulfur from ore from a complex shaking table.

[0070] The sample was selected from a complex shaking table ore containing silver, copper, zinc and sulfur in Guangxi. The main valuable minerals are cassiterite, chalcopyrite, sphalerite, argentite, and chalcopyrite. The Ag grade is 27.3 g / t, the Cu grade is 0.09%, the Zn grade is 0.42%, and the S grade is 1.95%.

[0071] The mineral processing method includes the following steps:

[0072] S1. Grind the raw ore until 78% of it is below 0.074mm to obtain the ground product;

[0073] S2. Silver-copper-sulfur flotation: Add inhibitor to the product after grinding obtained in step S1 and stir for 3 minutes. Then continue to add collector for roughing and scavenging. After scavenging, add inhibitor and perform 2 to 3 cleaning processes to obtain silver-copper-sulfur mixed concentrate and equal flotation tailings.

[0074] S3 grinds the silver-copper-sulfur mixed concentrate obtained in step S2 until 82% of the concentrate is below 0.043 mm in diameter, and obtains the ground silver-copper-zinc-sulfur mixed concentrate.

[0075] S4. Separation of silver, copper and sulfur by flotation: Add inhibitor to the silver-copper-sulfur mixed concentrate obtained after grinding in step S3 and stir for 3 minutes. Then add collector for roughing and scavenging. After scavenging, add inhibitor and perform 2 to 3 cleaning processes to obtain silver-copper concentrate and sulfur concentrate 1.

[0076] S5. Zinc-sulfur mixed flotation: Add an activator to the equal flotation tailings obtained in step S2 and stir for 3 minutes, then add a collector and stir for 3 minutes, add a frother for roughing, add a collector for scavenging, and continue to perform 2 to 3 cleaning processes to obtain zinc-sulfur mixed concentrate and sulfur tailings.

[0077] S6. Add inhibitors to the zinc-sulfur mixed concentrate obtained in step S5 and grind it until 75% of the concentrate is below 0.043 mm to obtain the ground zinc-sulfur mixed concentrate.

[0078] S7. Zinc-sulfur separation: Add an activator to the milled zinc-sulfur mixed concentrate obtained in step S6 and stir for 3 minutes. Then add a collector for roughing and scavenging. Continue adding a depressant and perform 3-4 cleaning cycles to obtain zinc concentrate and sulfur concentrate 2.

[0079] The specific drug usage details are shown in Table 2, and the specific indicators are shown in Table 5.

[0080] Comparative Example 1: A mineral processing method

[0081] The beneficiation method for complex shaking table ore containing silver, copper, zinc, and sulfur includes the following steps:

[0082] S1. Grind 80% of the feed ore to a thickness below 0.074 mm;

[0083] S2. Silver-copper-zinc-sulfur mixed flotation: Collectors and frothers are added to the product after grinding to carry out silver-copper-zinc-sulfur mixed flotation to obtain silver-copper-zinc-sulfur mixed concentrate and sulfur tailings;

[0084] S3. Add activated carbon to the mixed silver-copper-zinc-sulfur concentrate for descaling;

[0085] S4. Grind the de-treated silver-copper-zinc-sulfur mixed concentrate to a density of 82% below 0.043 mm;

[0086] S5. Separation of silver-copper and zinc-sulfur flotation: Add inhibitors and collectors to the milled silver-copper-zinc-sulfur mixed concentrate and carry out flotation to obtain silver-copper concentrate and zinc-sulfur mixed concentrate;

[0087] S6. Zinc-sulfur separation: Add inhibitors, activators, and collectors to the zinc-sulfur mixed concentrate to separate zinc concentrate and sulfur concentrate.

[0088] The ore feed was the same as in Example 1. The specific reagents used for separation are shown in Table 3.

[0089] Comparative Example 2: A mineral processing method

[0090] The beneficiation method for complex shaking table ore containing silver, copper, zinc, and sulfur includes the following steps:

[0091] S1. Grind 70% of the feed ore to a thickness below 0.074 mm;

[0092] S2. Silver-copper-zinc-sulfur mixed flotation: Collectors and frothers are added to the product after grinding to carry out silver-copper-zinc-sulfur mixed flotation to obtain silver-copper-zinc-sulfur mixed concentrate and sulfur tailings;

[0093] S3. Add activated carbon to the mixed silver-copper-zinc-sulfur concentrate for descaling;

[0094] S4. Grind the de-treated silver-copper-zinc-sulfur mixed concentrate to a density of 85% below 0.043 mm;

[0095] S5. Separation of silver-copper and zinc-sulfur flotation: Add inhibitors and collectors to the milled silver-copper-zinc-sulfur mixed concentrate and carry out flotation to obtain silver-copper concentrate and zinc-sulfur mixed concentrate;

[0096] S6. Zinc-sulfur separation: Add inhibitors, activators, and collectors to the zinc-sulfur mixed concentrate to separate zinc concentrate and sulfur concentrate.

[0097] 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.

[0098] Comparative Example 3: A mineral processing method

[0099] The beneficiation method for complex shaking table ore containing silver, copper, zinc, and sulfur includes the following steps:

[0100] S1. Grind the ore to a thickness of less than 0.074 mm, accounting for 75%;

[0101] S2. Silver-copper-zinc-sulfur mixed flotation: Collectors and frothers are added to the product after grinding to carry out silver-copper-zinc-sulfur mixed flotation to obtain silver-copper-zinc-sulfur mixed concentrate and sulfur tailings;

[0102] S3. Add activated carbon to the mixed silver-copper-zinc-sulfur concentrate for descaling;

[0103] S4. Grind the de-treated silver-copper-zinc-sulfur mixed concentrate to a density of 80% below 0.043 mm;

[0104] S5. Separation of silver-copper and zinc-sulfur flotation: Add inhibitors and collectors to the milled silver-copper-zinc-sulfur mixed concentrate and carry out flotation to obtain silver-copper concentrate and zinc-sulfur mixed concentrate;

[0105] S6. Zinc-sulfur separation: Add inhibitors, activators, and collectors to the zinc-sulfur mixed concentrate to separate zinc concentrate and sulfur concentrate.

[0106] 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.

[0107] Comparative Example 4: A mineral processing method

[0108] The beneficiation method for complex shaking table ore containing silver, copper, zinc, and sulfur includes the following steps:

[0109] S1. 78% of the feed ore is ground to a thickness of less than 0.074 mm;

[0110] S2. Silver-copper-zinc-sulfur mixed flotation: Collectors and frothers are added to the product after grinding to carry out silver-copper-zinc-sulfur mixed flotation to obtain silver-copper-zinc-sulfur mixed concentrate and sulfur tailings;

[0111] S3. Add activated carbon to the mixed silver-copper-zinc-sulfur concentrate for descaling;

[0112] S4. Grind the de-treated silver-copper-zinc-sulfur mixed concentrate to a density of 82% below 0.043 mm;

[0113] S5. Separation of silver-copper and zinc-sulfur flotation: Add inhibitors and collectors to the milled silver-copper-zinc-sulfur mixed concentrate and carry out flotation to obtain silver-copper concentrate and zinc-sulfur mixed concentrate;

[0114] S6. Zinc-sulfur separation: Add inhibitors, activators, and collectors to the zinc-sulfur mixed concentrate to separate zinc concentrate and sulfur concentrate.

[0115] 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.

[0116] Table 1. Reagent usage in the mineral processing methods of Examples 1-2

[0117]

[0118]

[0119] Table 2. Reagent usage in the mineral processing methods of Examples 3-4

[0120]

[0121]

[0122] Table 3. Reagent usage in the mineral processing methods of Comparative Examples 1 and 2

[0123]

[0124] Table 4 shows the reagent usage in the mineral processing methods of Comparative Examples 3-4.

[0125]

[0126] Test case: Ore grade detection

[0127] 1. Test samples: Concentrates recovered from Examples 1-4 and Comparative Examples 1-4;

[0128] 2. Experimental procedure: Silver / low tin / low zinc (0.1-10%) was measured using an ICP inductively coupled plasma spectrometer, sulfur / high copper / high zinc / high tin (more than 10%) was measured by gravimetric method, and low copper (not exceeding 0.1%) and low tin (not exceeding 0.1%) were measured using an XRF fluorescence analyzer.

[0129] 3. Experimental Results: The specific experimental results are shown in Tables 5 and 6. The selection results for each embodiment are shown in Table 5, and the selection results for each comparative example are shown in Table 6.

[0130] Table 5. Selection results (%) for each embodiment

[0131]

[0132] Table 6. Selection results (%) for each pair of proportions

[0133]

[0134] As can be seen from Tables 5 and 6 above, the recovery method of the present invention can effectively recover silver, copper, zinc, and sulfur from shaking table ore containing silver, copper, zinc, and sulfur. Specifically:

[0135] In Example 1, the silver-copper concentrate had an Ag grade of 3287.9 ​​g / t and an Ag recovery rate of 70.61%, a Cu grade of 16.34% and a Cu recovery rate of 68.58%, a Zn grade of 41.09% and a Zn recovery rate of 65.63%, a S grade of 1 sulfur concentrate with a S recovery rate of 11.81%, a S grade of 2 sulfur concentrate with a S recovery rate of 38.67% and a S recovery rate of 53.49%, and a total S recovery rate of 65.30%. In Comparative Example 1, the silver-copper concentrate had an Ag grade of 1807.5 g / t and an Ag recovery rate of 56.70%, a Cu grade of 9.69% and a Cu recovery rate of 56.35%, a Zn grade of 27.59% and a Zn recovery rate of 55.82%, and a S grade of 36.19% and a S recovery rate of 59.99%. Therefore, compared with Comparative Example 1, Example 1 of the present invention yields silver concentrate with a silver grade 1480.4 g / t higher, copper grade 6.65% higher, silver recovery rate 13.91% higher, copper recovery rate 12.23% higher, zinc concentrate with a zinc grade 13.50% higher, zinc recovery rate 9.81% higher, and sulfur concentrate with a grade 2%-3% higher and sulfur recovery rate 5.31% higher.

[0136] In Example 2, the silver-copper concentrate had an Ag grade of 4326.8 g / t with an Ag recovery rate of 74.90%, a Cu grade of 18.12% with a Cu recovery rate of 72.01%, a Zn grade of 42.15% with a Zn recovery rate of 69.79%, a S grade of 1 sulfur concentrate with a S recovery rate of 12.05%, a S grade of 2 sulfur concentrate with a S recovery rate of 37.29% with a S recovery rate of 53.36%, and a total S recovery rate of 65.41%. In Comparative Example 2, the silver-copper concentrate had an Ag grade of 2567.8 g / t with an Ag recovery rate of 61.90%, a Cu grade of 10.29% with a Cu recovery rate of 52.92%, a Zn grade of 24.16% with a Zn recovery rate of 54.31%, and a S grade of 36.26% with a S recovery rate of 54.38%. Therefore, compared with Comparative Example 2, Example 2 of the present invention has a higher silver grade (1759 g / t), a higher copper grade (7.83%), a higher silver recovery rate (13.00%), a higher copper recovery rate (19.09%), a higher zinc grade (17.99%), a higher zinc recovery rate (15.48%), and a sulfur concentrate with a similar grade but a higher sulfur recovery rate (11.03%).

[0137] In Example 3, the silver-copper concentrate had an Ag grade of 3826.4 g / t and an Ag recovery rate of 75.98%, a Cu grade of 17.34% and a Cu recovery rate of 69.47%, a Zn grade of 43.52% and a Zn recovery rate of 71.43%, a S grade of 1 sulfur concentrate with a S recovery rate of 13.42%, a S grade of 2 sulfur concentrate with a S recovery rate of 48.84%, and a total S recovery rate of 62.26%. In Comparative Example 3, the silver-copper concentrate had an Ag grade of 1967.5 g / t and an Ag recovery rate of 57.33%, a Cu grade of 9.19% and a Cu recovery rate of 53.44%, a Zn grade of 23.91% and a Zn recovery rate of 58.45%, and a S grade of 35.01% and a S recovery rate of 49.29%. Therefore, compared with Comparative Example 3, Example 3 of the present invention has a higher silver grade (1858.9 g / t), a higher copper grade (8.15%), a higher silver recovery rate (18.65%), a higher copper recovery rate (16.03%), a higher zinc grade (19.61%), a higher zinc recovery rate (12.98%), and a similar sulfur concentrate grade with a higher sulfur recovery rate (12.97%).

[0138] In Example 4, the silver-copper concentrate had an Ag grade of 5167.8 g / t and an Ag recovery rate of 70.35%, a Cu grade of 19.16% and a Cu recovery rate of 68.36%, a Zn grade of 38.91% and a Zn recovery rate of 75.76%, a S grade of 1 sulfur concentrate with a S recovery rate of 8.97%, a S grade of 2 sulfur concentrate with a S recovery rate of 56.80%, and a total S recovery rate of 65.77%. In Comparative Example 4, the silver-copper concentrate had an Ag grade of 2615.5 g / t and an Ag recovery rate of 52.47%, a Cu grade of 10.05% and a Cu recovery rate of 51.62%, a Zn grade of 24.16% and a Zn recovery rate of 64.92%, and a S grade of 37.41% and a S recovery rate of 54.85%. Therefore, compared with Comparative Example 4, Example 4 yielded a silver-copper concentrate with a silver grade 2552.3 g / t higher, a copper grade 9.11% higher, a silver recovery rate 17.88% higher, a copper recovery rate 16.74% higher, a zinc concentrate with a zinc grade 14.75% higher, a zinc recovery rate 10.84% ​​higher, and a sulfur concentrate with a grade basically the same, but a sulfur recovery rate 10.92% higher.

[0139] In summary, the indicators obtained by the method of the present invention are significantly higher than those obtained by the prior art. The present invention can obtain silver-copper concentrate, zinc concentrate and sulfur concentrate with higher grade and recovery rate.

[0140] Finally, it should be noted that the above description of the embodiments is intended to enable those skilled in the art to understand and use the invention. Those skilled in the art will readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any 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 invention should be within the protection scope of the present invention.

Claims

1. A mineral processing method for recovering silver, copper, zinc, and sulfur from ore in a complex shaking table, characterized in that, Includes the following steps: S1. Grind the raw ore to obtain the ground product; S2. Silver-copper-sulfur flotation: Add inhibitors to the grinding product obtained in step S1, add collectors for roughing and scavenging, and then add inhibitors for cleaning to obtain silver-copper-sulfur mixed concentrate and equal flotation tailings. S3. Grind the silver-copper-sulfur mixed concentrate obtained in step S2 to obtain the ground silver-copper-zinc-sulfur mixed concentrate; S4. Separation of silver and copper from sulfur by flotation: Add inhibitors to the silver-copper-zinc-sulfur mixed concentrate obtained after grinding in step S3, add collectors for roughing and scavenging, and then add inhibitors for cleaning to obtain silver-copper concentrate and sulfur concentrate 1. S5. Zinc-sulfur mixed flotation: Add activator, collector and frother to the equal flotation tailings obtained in step S2 for roughing, add collector for scavenging, and then clean to obtain zinc-sulfur mixed concentrate and sulfur tailings. S6. Add inhibitor to the zinc-sulfur mixed concentrate obtained in step S5 and grind it to obtain the ground zinc-sulfur mixed concentrate. S7. Zinc-sulfur separation: Add an activator to the zinc-sulfur mixed concentrate obtained after grinding in step S6, then add a collector for roughing and scavenging, and then add an inhibitor for cleaning to obtain zinc concentrate and sulfur concentrate 2. In step S1, the Ag grade in the grinding product is 9.8 g / t to 24.3 g / t, the Cu grade is 0.05% to 0.11%, the Zn grade is 0.38% to 0.55%, and the S grade is 1.41% to 2.43%. In step S4, the amount of inhibitor added to the milled silver-copper-sulfur mixed concentrate is 300 g / t to 600 g / t, and the amount of inhibitor added during the refining process is 60 g / t to 120 g / t. The inhibitor is selected from one or two of lime, sodium humate, and sodium sulfite. The roughing process in step S4 is as follows: add 3g / t to 6g / t of collector, stir for 2min to 3min, and perform roughing; the scavenging process is as follows: add 0.5g / t to 1g / t of collector for the first scavenging, and add 0.3g / t to 0.5g / t of collector for the second scavenging; the collector is selected from one or two of Y89 xanthate and Z200; the amount of activator added during the roughing process in step S5 is 100g / t to 800g / t; the amount of collector added... The concentration of the activator is 120g / t to 160g / t; the amount of the frother added is 15g / t to 25g / t; the process of adding the collector for scavenging is as follows: add 20g / t to 30g / t of collector for one scavenging, add 10g / t to 20g / t of collector for a second scavenging; the activator in step S5 is selected from one or two of copper sulfate and oxalic acid, the collector is selected from one or two of butyl xanthate and ethyl xanthate, and the frother is selected from one of pine oil and methyl isobutyl methanol.

2. The mineral processing method as described in claim 1, characterized in that, In step S2, the amount of inhibitor added to the grinding product is 2000g / t to 4000g / t, and the amount of inhibitor added during fine selection is 200g / t to 600g / t. The inhibitor is selected from any two of sodium carbonate, zinc sulfate, and sodium sulfite.

3. The mineral processing method as described in claim 1, characterized in that, The coarse selection process in step S2 is as follows: add 80g / t to 120g / t of collector, stir for 2min to 3min, and perform coarse selection; the scavenging process is as follows: add 20g / t to 30g / t of collector, perform one scavenging, add 10g / t to 15g / t of collector, and perform a second scavenging; the collector is selected from one or two of butylammonium black powder, Z200, ethyl xanthate, and ethyl bixanthate.

4. The mineral processing method as described in claim 1, characterized in that, The amount of inhibitor added in step S6 is 400g / t to 800g / t, and the inhibitor is selected from one or two of lime and sodium humate.

5. The mineral processing method as described in claim 1, characterized in that, In step S7, the amount of activator added is 10 g / t to 15 g / t, and the activator is copper sulfate; the amount of inhibitor added is 100 g / t to 200 g / t; the inhibitor is selected from one or two of lime, sodium humate, and sodium sulfite.

6. The mineral processing method as described in claim 1, characterized in that, The coarse selection process in step S7 is as follows: add 3g / t to 5g / t of collector, stir for 2min to 3min, and perform coarse selection; the scavenging process is as follows: add 1g / t to 2g / t of collector, perform one scavenging, add 0.4g / t to 0.8g / t of collector, and perform a second scavenging; the collector in step S7 is selected from one or two of ethyl xanthate, butyl xanthate, and Z200.

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