A method for processing complex copper-lead-zinc bulk concentrates

Abstract

The present application relates to a kind of complex copper lead zinc mixed concentrate processing method, mainly using "sodium sulfide and activated carbon desorption de-drug-copper, zinc, lead sequential flotation" processing method, desorption mixed concentrate surface adhesion Large amount of flotation residual reagent and impurity ions in slurry, eliminate the adverse effects on separation, by copper, zinc, lead sequential flotation, solve the existing mixed flotation reseparation process Copper lead separation difficult, copper concentrate lead zinc mutual containing high Problem, can produce qualified lead concentrate, copper, lead, zinc Each metal recovery rate is greatly increased, the harmful impurities in each concentrate product that greatly affect smelting also significantly reduced.

Description

Technical Field

[0001] This invention belongs to the field of flotation technology in mineral processing methods, specifically relating to a method for processing complex copper-lead-zinc mixed concentrates. Background Technology

[0002] Mineral processing involves processing raw ore extracted from mines to enrich useful minerals and discard useless gangue. The enriched useful minerals are called concentrates, used for metal smelting, while gangue is discarded as tailings. Flotation is a mineral processing method that separates mineral particles based on their surface physicochemical properties and floatability. It uses various reagents to adjust the physicochemical properties of the surface of various mineral particles and the flotation medium, thereby increasing the differences in hydrophobicity and hydrophilicity (i.e., floatability) between minerals and improving flotation efficiency. The ore flotation process includes three stages: pulp preparation, reagent adjustment, and aerated flotation. Pulp preparation includes grinding, classification, and pulp conditioning to obtain particles of the desired size and pulp concentration. In practical applications, pulp flotation is a continuous process consisting of several flotation units, divided into multiple cycles according to the ore characteristics. Each cycle consists of roughing and several cleaning and scavenging operations. The flotation effect of ore is determined by the ore flotation characteristics, equipment configuration, and flotation reagent system.

[0003] To date, the separation of low-grade copper-lead-zinc mixed concentrates has remained a challenge, primarily due to the following reasons: ① The sulfide minerals of copper, lead, and zinc in the mixed concentrate are often densely coexisting, with fine and uneven particle sizes, making it difficult to achieve individual liberation during grinding; ② The surface of the mixed concentrate obtained from flotation has a large amount of residual flotation reagents adhering to it, resulting in poor separation performance; ③ The mineral composition of copper-lead-zinc mixed concentrates is complex, with a wide range of fluctuations in the content of valuable components, diverse structures, and a large range of particle sizes, requiring different processing procedures for different concentrates; ④ The reagent regime has a significant impact on separation performance; ⑤ The use of recycled water during flotation has a significant impact on performance; ⑥ Using a mixed flotation and re-separation process makes copper-lead separation difficult, resulting in high lead-zinc content in the copper concentrate and the inability to produce qualified lead concentrate.

[0004] Therefore, existing copper-lead-zinc sulfide flotation processes often suffer from problems such as low metal recovery rate in concentrate, high production cost, poor adaptability to different ores, high toxicity of copper-lead inhibitors, and serious environmental pollution. This invention mainly provides a method for treating complex copper-lead-zinc mixed concentrates that can effectively improve metal recovery rate, reduce production cost, improve adaptability to ores with different properties, and reduce environmental pollution. Summary of the Invention

[0005] To address the above problems, this invention provides a method for processing complex copper-lead-zinc mixed concentrates.

[0006] The specific technical solution is: a method for processing complex copper-lead-zinc mixed concentrate, including the following steps:

[0007] (1) The copper-lead-zinc mixed concentrate to be separated by flotation is transported to the grinding system for grinding. Na2S and carbon powder are added during the grinding process. Under the condition of 70% to 75% slurry concentration, the particle size of -0.019mm accounts for more than 85%. Then, the carbon powder in the mixed concentrate is removed by filtration.

[0008] (2) The concentrate obtained by filtration in step (1) is sent to the No. 1 mixing tank, zinc sulfate and sodium sulfite inhibitors for zinc sulfide are added, and after adjusting the slurry for 3 minutes, it flows into the No. 2 mixing tank, copper collector Z-200 40g / t is added, and after adjusting the slurry for 3 minutes, it is introduced into the flotation machine for copper-zinc sequential flotation to obtain copper roughing concentrate and copper roughing tailings.

[0009] The zinc sulfide inhibitor mentioned in step (2) is 10,000 g / t of zinc sulfate + 10,000 g / t of sodium sulfite.

[0010] (3) The copper roughing concentrate slurry obtained in step (2) is introduced into the flotation machine for copper cleaning. 2000g / t zinc sulfate and 2000g / t sodium sulfite inhibitors are added. After adjusting the slurry for 3 minutes, copper concentrate and middlings are obtained.

[0011] (4) The copper roughing tailings slurry obtained in step (2) is introduced into the flotation machine for two copper scavenging processes. In the first scavenging process, 5000 g / t of zinc sulfate inhibitor, 5000 g / t of sodium sulfite, and 20 g / t of collector Z-200 are added, and the slurry is conditioned for 3 minutes. In the second scavenging process, 2500 g / t of zinc sulfate inhibitor, 2500 g / t of sodium sulfite, and 10 g / t of collector Z-200 are added, and the slurry is conditioned for 3 minutes. The copper scavenging concentrates from copper scavenging one and copper scavenging two are combined and enter the middlings copper roughing process, while the copper scavenging tailings from copper scavenging two enter the zinc roughing process.

[0012] (5) The middlings obtained in step (3) are subjected to one copper roughing, one copper scavenging, and one copper cleaning. In the copper roughing process, 4000g / t of zinc sulfate and 4000g / t of sodium sulfite are added as inhibitors, and the pulp is adjusted for 3 minutes. In the copper scavenging process, 2000g / t of zinc sulfate and 2000g / t of sodium sulfite and 20g / t of collector Z-200 are added as inhibitors, and the pulp is adjusted for 3 minutes. The copper roughing concentrate and the copper scavenging concentrate are combined and enter the copper cleaning process. The copper cleaning concentrate and the copper cleaning concentrate are combined to form the final copper concentrate. The copper roughing tailings and the copper scavenging tailings are combined and enter the zinc roughing process.

[0013] (6) The copper scavenging tailings obtained in step (4) and the copper roughing tailings and middlings copper scavenging tailings obtained in step (5) are combined and put into the No. 3 mixing tank. The pH value is adjusted to 5.5. In the No. 4 mixing tank, 500g / t of zinc sulfide activator copper sulfate, 10g / t of foaming agent No. 2 oil, and 50g / t of collector butyl xanthate are added. The slurry is adjusted for 3 minutes and zinc roughing is carried out to obtain zinc roughing concentrate and zinc roughing tailings.

[0014] (7) The zinc roughing concentrate obtained in step (6) is introduced into the flotation machine for two zinc cleanings. In the first zinc cleaning, 5g / t of frother No. 2 oil is added and the slurry is adjusted for 3 minutes. In the second zinc cleaning, no reagent is added and the slurry is adjusted for 3 minutes to obtain the final product zinc concentrate. The tailings of the first zinc cleaning are returned to the zinc roughing process, and the tailings of the second zinc cleaning are returned to the first zinc cleaning process.

[0015] (8) The zinc roughing tailings obtained in step (6) are introduced into the flotation machine for zinc scavenging. Foaming agent No. 2 oil 5g / t + butyl xanthate 25g / t are added to the zinc scavenging, and the slurry is adjusted for 3 minutes to obtain zinc scavenging concentrate and zinc scavenging tailings. The zinc scavenging concentrate enters the zinc roughing process.

[0016] (9) The zinc scavenging tailings obtained in step (8) are introduced into a flotation machine for lead roughing. 3000g / t of lime, 1000g / t of Na2S, 600g / t of water glass, 60g / t of butyl xanthate, 60g / t of sodium oleate, and 4g / t of No. 2 oil are added for lead roughing to obtain lead roughing concentrate and lead roughing tailings.

[0017] (10) The lead roughing concentrate obtained in step (9) is introduced into the flotation machine for two lead cleanings. In the first lead cleaning, 100g / t of water glass is added and the pulp is adjusted for 3 minutes. In the second cleaning, no reagent is added and the pulp is adjusted for 3 minutes to obtain the final product, lead-rich medium ore. The tailings from the first lead cleaning are returned to the lead roughing process, and the tailings from the second lead cleaning are returned to the first lead cleaning process.

[0018] (11) The lead roughing tailings obtained in step (9) are introduced into the flotation machine for lead scavenging. 400g / t of Na2S, 300g / t of water glass, 30g / t of butyl xanthate, 30g / t of sodium oleate, and 1g / t of No. 2 oil are added for lead scavenging. The lead scavenging concentrate is returned to the lead roughing process, and the lead scavenging tailings are the final tailings.

[0019] Furthermore, in step (1), the amount of Na2S and carbon powder added during the grinding process is 1000g / t.

[0020] Furthermore, the pH value in step (6) is adjusted by adding dilute sulfuric acid.

[0021] The beneficial effects of this invention are:

[0022] (1) The present invention adopts the treatment method of “sodium sulfide and activated carbon desorption and de-reagent-copper, zinc and lead sequential flotation” to desorb a large amount of residual flotation reagents and impurity ions in the pulp adhering to the surface of the mixed concentrate, thereby eliminating the adverse effects on the separation. Through the sequential flotation of copper, zinc and lead, the problems of difficult copper-lead separation and high lead-zinc content in copper concentrate that exist in the existing mixed flotation and re-separation process are solved. Qualified lead-enriched ore can be produced, the recovery rate of copper, lead and zinc metals is greatly increased, and the harmful impurities that have a great impact on smelting in each concentrate product are also significantly reduced.

[0023] (2) This invention eliminates highly toxic chemical reagents, especially sodium cyanide, a copper sulfide inhibitor that must be used in the copper-suppressing lead flotation process. The reagents used are low in toxicity, degrade relatively quickly, have minimal environmental pollution, and are highly safe and controllable. Moreover, the selected reagents are inexpensive, which can significantly reduce production costs. Attached Figure Description

[0024] Figure 1 This is a process flow diagram of a complex copper-lead-zinc mixed concentrate processing method according to the present invention;

[0025] Figure 2 This is an equipment association diagram of a complex copper-lead-zinc mixed concentrate processing method according to the present invention;

[0026] Figure 3 This is a process flow diagram of existing complex copper-lead-zinc mixed concentrate processing methods. Detailed Implementation

[0027] To make the technical problems and solutions solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0028] Example 1

[0029] The main chemical composition of the complex copper-lead-zinc mixed concentrate selected in this embodiment is shown in Table 1.

[0030] Table 1. Main chemical components of complex copper-lead-zinc mixed concentrate

[0031] content(%) 10.50 8.38 16.17 29.50 29.68 540.19 element TFe <![CDATA[Fe2O3]]> As Bi Mo <![CDATA[SiO2]]> content(%) 21.43 30.64 0.20 0.15 0.20 1.57 element <![CDATA[Al2O3]]> <![CDATA[P2O5]]> <![CDATA[TiO2]]> CaO MgO <![CDATA[K2O]]> content(%) 0.46 0.01 0.03 0.63 0.39 0.06

[0032] like Figure 1 Figure 2 As shown, the processing method of the present invention is applied to the ore, and the specific steps are as follows:

[0033] (1) The copper-lead-zinc mixed concentrate to be separated by flotation is transported to the grinding system for grinding. During the grinding process, 1000g / t of Na2S and 1000g / t of carbon powder are added. Under the condition that the pulp concentration is 70% to 75%, the particle size of -0.019mm accounts for more than 85%. Then, the carbon powder in the mixed concentrate is removed by filtration.

[0034] (2) The concentrate obtained by filtration in step (1) is fed into the No. 1 mixing tank, and zinc sulfate 10000g / t and sodium sulfite 10000g / t, which are inhibitors of zinc sulfide, are added. After adjusting the slurry for 3 minutes, it flows into the No. 2 mixing tank, and copper collector Z-200 40g / t is added. After adjusting the slurry for 3 minutes, it is introduced into the flotation machine for copper-zinc sequential flotation to obtain copper roughing concentrate and copper roughing tailings.

[0035] (3) The copper rough concentrate slurry obtained in step (2) is introduced into the flotation machine for copper beneficiation. 2000g / t of zinc sulfate and 2000g / t of sodium sulfite are added. After adjusting the slurry for 3 minutes, copper concentrate and middlings are obtained.

[0036] (4) The copper roughing tailings slurry obtained in step (2) is introduced into the flotation machine for two copper scavenging processes. In the first scavenging process, 5000 g / t of zinc sulfate, 5000 g / t of sodium sulfite, and 20 g / t of collector Z-200 are added, and the slurry is conditioned for 3 minutes. In the second scavenging process, 2500 g / t of zinc sulfate, 2500 g / t of sodium sulfite, and 10 g / t of collector Z-200 are added, and the slurry is conditioned for 3 minutes. The copper scavenging concentrates from copper scavenging one and copper scavenging two are combined and enter the middlings copper roughing process, while the copper scavenging tailings from copper scavenging two enter the zinc roughing process.

[0037] (5) The middlings obtained in step (3) are subjected to one copper roughing, one copper scavenging, and one copper cleaning. In the middlings copper roughing, 4000g / t of zinc sulfate and 4000g / t of sodium sulfite are added and the slurry is adjusted for 3 minutes. In the middlings copper scavenging, 2000g / t of zinc sulfate, 2000g / t of sodium sulfite and 20g / t of collector Z-200 are added and the slurry is adjusted for 3 minutes. The middlings copper roughing concentrate and the middlings copper scavenging concentrate are combined and enter the middlings copper cleaning. The middlings copper cleaning concentrate and the copper cleaning concentrate are combined to form the final copper concentrate. The middlings copper roughing tailings and the middlings copper scavenging tailings are combined and enter the zinc roughing.

[0038] (6) The copper scavenging tailings obtained in step (4) and the copper roughing tailings and middlings copper scavenging tailings obtained in step (5) are combined and put into the No. 3 mixing tank. Dilute sulfuric acid is added to adjust the pH value to 5.5. In the No. 4 mixing tank, 500g / t of copper sulfate, 10g / t of No. 2 oil and 50g / t of butyl xanthate are added. The slurry is adjusted for 3 minutes and zinc roughing is carried out to obtain zinc roughing concentrate and zinc roughing tailings.

[0039] (7) The zinc roughing concentrate obtained in step (6) is introduced into the flotation machine for two zinc cleaning processes. In the first zinc cleaning process, 5g / t of No. 2 oil is added and the pulp is adjusted for 3 minutes. In the second zinc cleaning process, no reagent is added and the pulp is adjusted for 3 minutes to obtain the final product zinc concentrate. The tailings from the first zinc cleaning process are returned to the zinc roughing process, and the tailings from the second zinc cleaning process are returned to the first zinc cleaning process.

[0040] (8) The zinc roughing tailings obtained in step (6) are introduced into the flotation machine for zinc scavenging. 5g / t of No. 2 oil and 25g / t of butyl xanthate are added to the zinc scavenging, and the slurry is adjusted for 3 minutes to obtain zinc scavenging concentrate and zinc scavenging tailings. The zinc scavenging concentrate enters the zinc roughing process.

[0041] (9) The zinc scavenging tailings obtained in step (8) are introduced into a flotation machine for lead roughing. 3000g / t of lime, 1000g / t of Na2S, 600g / t of water glass, 60g / t of butyl xanthate, 60g / t of sodium oleate, and 4g / t of No. 2 oil are added for lead roughing to obtain lead roughing concentrate and lead roughing tailings.

[0042] (10) The lead roughing concentrate obtained in step (9) is introduced into the flotation machine for two lead cleanings. In the first lead cleaning, 100g / t of water glass is added and the pulp is adjusted for 3 minutes. In the second cleaning, no reagent is added and the pulp is adjusted for 3 minutes to obtain the final product, lead-rich medium ore. The tailings from the first lead cleaning are returned to the lead roughing process, and the tailings from the second lead cleaning are returned to the first lead cleaning process.

[0043] (11) The lead roughing tailings obtained in step (9) are introduced into the flotation machine for lead scavenging. 400g / t of Na2S, 300g / t of water glass, 30g / t of butyl xanthate, 30g / t of sodium oleate, and 1g / t of No. 2 oil are added for lead scavenging. The lead scavenging concentrate is returned to the lead roughing process, and the lead scavenging tailings are the final tailings.

[0044] The flotation results obtained after implementing this method are shown in Table 2.

[0045] Table 2 Flotation Results

[0046]

[0047] Example 2

[0048] In this embodiment, a complex copper-lead-zinc sulfide concentrate was selected. The copper mineral was mainly chalcopyrite, with trace amounts of tetrahedrite, chalcocite, and azurite. The lead mineral was galena. The zinc mineral was sphalerite. The iron minerals were magnetite and siderite, followed by small amounts of hematite and limonite. Other metallic minerals included pyrite, small amounts of marcasite and arsenopyrite. The gangue minerals were mainly quartz and dolomite, followed by calcite and kaolinite, with small amounts of biotite, orthoclase, plagioclase, and chlorite. Its multi-element analysis is shown in Table 3.

[0049] Table 3. Main chemical components of complex copper-lead-zinc mixed concentrate

[0050] content(%) 8.96 7.94 15.21 29.50 28.68 440.19 element TFe <![CDATA[Fe2O3]]> As Bi Mo <![CDATA[SiO2]]> content(%) 21.43 30.64 0.20 0.15 0.20 1.57 element <![CDATA[Al2O3]]> <![CDATA[P2O5]]> <![CDATA[TiO2]]> CaO MgO <![CDATA[K2O]]> content(%) 0.46 0.01 0.03 0.63 0.39 0.06

[0051] The specific steps for applying this invention to the ore are as follows:

[0052] (1) The copper-lead-zinc mixed concentrate to be separated by flotation is transported to the grinding system for grinding. Under the condition of grinding concentration of 70% to 75%, it is ground to a particle size of -0.074mm of 85%. Then the pulp concentration is adjusted to 28% to 35%. During grinding, 1000g / t of lime and YJ-1600g / t of high efficiency precipitant for copper and lead ions must be added at the feed inlet of the first mill.

[0053] (2) The slurry obtained in step (1) is introduced into the No. 1 mixing tank. 2000g / t of zinc sulfate and 1000g / t of sodium sulfite, which are inhibitors of zinc sulfide, are added and the slurry is adjusted for 3 minutes. Then it flows into the No. 2 mixing tank. 18g / t of copper collector Z-200 and 10g / t of lead collector YK906 are added and the slurry is adjusted for 2 minutes.

[0054] (3) The slurry obtained in step (2) is introduced into a flotation machine for mixed copper-lead flotation. During this process, one roughing (flotation for 5 minutes) and two scavenging (scavenging one and two each for 4 minutes) are performed. In scavenging one, zinc sulfate 800g / t and sodium sulfite 400g / t, a zinc sulfide inhibitor, are added. After conditioning the slurry for 3 minutes, copper-lead collectors Z-200 5g / t and YK906 5g / t are added. After conditioning the slurry for 2 minutes, flotation is performed. In scavenging two, zinc sulfate 400g / t and sodium sulfite 200g / t, a zinc sulfide inhibitor, are added (conditioning the slurry for 3 minutes) and copper-lead collectors Z-200 2g / t and YK906 2g / t (conditioning the slurry for 2 minutes) are added before flotation. Copper-lead mixed rough concentrate and tailings from scavenging two are obtained.

[0055] (4) The scavenged tailings obtained in step (3) are introduced into the No. 3 mixing tank, and 100g / t of copper sulfate activator for zinc sulfide is added to adjust the slurry for 3 minutes. Then it flows into the No. 4 mixing tank, and 35g / t of YK906 collector for zinc sulfide and 10g / t of No. 2 oil frother are added to adjust the slurry for 2 minutes.

[0056] (5) Introduce the slurry from step (4) into a flotation machine for zinc sulfide flotation. During this process, one roughing (flotation for 5 minutes), three cleanings (cleanings I, II, and III for 4 minutes, 3 minutes, and 3 minutes respectively), and two scavengings (scavengings I and II for 4 minutes each) are performed. For cleanings I and II, 300 g / t and 100 g / t of lime are added respectively, and the slurry is conditioned for 3 minutes. For scavenging I, 50 g / t of copper sulfate (an activator for zinc sulfide) is added, and after conditioned for 3 minutes, 15 g / t of YK906 (a collector for zinc sulfide) is added, and the slurry is conditioned for 2 minutes. For scavenging II, 25 g / t of copper sulfate (an activator for zinc sulfide) is added, and after conditioned for 3 minutes, 10 g / t of YK906 (a collector for zinc sulfide) is added, and the slurry is conditioned for 2 minutes. Zinc sulfide concentrate and tailings are obtained.

[0057] (6) The copper scavenging tailings obtained in step (4) and the copper roughing tailings and middlings copper scavenging tailings obtained in step (5) are combined and put into the No. 3 mixing tank. Dilute sulfuric acid is added to adjust the pH value to 5.5. In the No. 4 mixing tank, 500g / t of copper sulfate, 10g / t of No. 2 oil and 50g / t of butyl xanthate are added. The slurry is adjusted for 3 minutes and zinc roughing is carried out to obtain zinc roughing concentrate and zinc roughing tailings.

[0058] (7) The copper-lead rough concentrate slurry obtained in step (6) is introduced into a flotation machine for copper-lead mixed cleaning, and a total of three mixed cleaning processes are carried out (cleaning processes one, two, and three are floated for 4 minutes, 3 minutes, and 3 minutes respectively). During this process, zinc sulfate 100g / t + sodium sulfite 50g / t, a zinc sulfide inhibitor, is added to cleaning process two, and the slurry is adjusted for 3 minutes. The tailings from cleaning process one and the slurry from the No. 2 mixing tank in step (2) are combined and flowed into the copper-lead mixed roughing operation, while the copper-lead mixed concentrate is concentrated to a concentration of 60%.

[0059] (8) The copper-lead mixed concentrate (60%) in the pretreatment is detreated by three-stage stirring (stirring tank #7, stirring tank #8 and stirring tank #9). The copper-lead mixed concentrate obtained in step (7) is fed into stirring tank #7, 1200g / t of sodium sulfide and 2800g / t of activated carbon are added and stirred for 10 minutes, and then it is successively fed into stirring tanks #8 and #9 and stirred for 10 minutes each;

[0060] (9) Introduce the slurry obtained in step (8) into the No. 10 mixing tank, add copper sulfide inhibitor YK520 5000g / t high concentration slurry for 3 minutes, add lead sulfide collector YK902 450g / t and foaming agent No. 2 oil 100g / t high concentration slurry for 2 minutes in the No. 11 mixing tank, then add water and adjust the slurry concentration to 10%~20%;

[0061] (10) The slurry obtained in step (9) is fed into a copper-lead separation flotation machine for separation. During this process, one roughing (flotation for 3 minutes), three cleanings (cleanings I, II, and III are flotated for 3 minutes, 2 minutes, and 2 minutes respectively), and two scavengings (scavengings I and II are flotated for 2 minutes each). Copper sulfide inhibitor YK520 is added to cleanings I and II at 600 g / t and 300 g / t respectively (each for 3 minutes of slurry conditioning); copper sulfide inhibitor YK520 is added to scavengings I and II at 2000 g / t and 1000 g / t respectively (each for 3 minutes of slurry conditioning); lead sulfide collector YK902 is added to scavengings I and II at 150 g / t and 100 g / t respectively (each for 2 minutes of slurry conditioning); at the same time, frother 2# oil 50 g / t is added to scavenging I (slurry conditioning for 2 minutes). Finally, copper sulfide concentrate and lead sulfide concentrate are obtained.

[0062] The flotation results obtained after implementing this method are shown in Table 4.

[0063] Table 4 Flotation Results

[0064]

[0065] Comparative Example

[0066] like Figure 3 As shown, the existing method for processing complex copper-lead-zinc mixed concentrates is to use the process of "re-grinding and de-reagenting - copper-lead flotation - copper-lead separation - tailings zinc beneficiation".

[0067] (1) The copper-lead-zinc mixed concentrate to be separated by flotation is transported to the grinding system for grinding. During the grinding process, 2000g / t of Na2S and 2000g / t of carbon powder are added. After grinding until the particle size of -0.019mm accounts for more than 80%, the carbon powder in the mixed concentrate is removed by filtration.

[0068] (2) The concentrate obtained by filtration in step (1) is fed into the No. 1 mixing tank, and zinc sulfate 30000g / t + sodium sulfite 30000g / t, which are inhibitors of zinc sulfide, are added. After adjusting the slurry for 3 minutes, it flows into the No. 2 mixing tank, and copper-lead collector Z-200 40g / t + ethyl thiocyanate 80g / t is added. After adjusting the slurry for 3 minutes, it is introduced into the flotation machine for copper-lead mixed flotation to obtain copper-lead concentrate and copper-lead roughing tailings.

[0069] (3) The copper-lead concentrate slurry obtained in step (2) is introduced into a flotation machine for copper-lead beneficiation. 5000g / t zinc sulfate and 5000g / t sodium sulfite are added as inhibitors. After adjusting the slurry for 3 minutes, copper-lead concentrate and middlings 1 are obtained.

[0070] (4) The copper-lead roughing tailings slurry obtained in step (2) is introduced into the flotation machine for copper-lead scavenging. 15000g / t of zinc sulfate inhibitor, 15000g / t of sodium sulfite, 20g / t of collector Z-200, and 40g / t of ethyl thiocyanate are added. The slurry is adjusted for 3 minutes. The copper-lead scavenging concentrate enters the copper-lead beneficiation stage, and the copper-lead scavenging tailings enter the zinc roughing stage.

[0071] (5) The copper-lead concentrate obtained in step (3) is subjected to one lead roughing, one lead scavenging, and one lead cleaning. In the lead roughing, 2000g / t of pH adjuster CaO is added, along with 1000g / t of collector BK520, 100g / t of ethyl thiocyanate, and 10g / t of No. 2 oil. The slurry is adjusted for 3 minutes. In the lead scavenging, 500g / t of collector BK520, 50g / t of ethyl thiocyanate, and 5g / t of No. 2 oil are added. The slurry is adjusted for 3 minutes. The lead roughing concentrate enters the lead cleaning process, and the lead roughing tailings enter the lead scavenging process. The lead cleaning concentrate is the final lead concentrate, and the lead cleaning tailings are the middlings 2. The lead scavenging concentrate enters the lead cleaning process, and the lead scavenging tailings are the final copper concentrate.

[0072] (6) The copper-lead scavenging tailings obtained in step (4) are subjected to zinc roughing. Before roughing, 1000g / t of Na2S and 1000g / t of carbon powder are added, the carbon powder is removed by filtration, 2000g / t of pH adjuster CaO, 2000g / t of copper inhibitor CuSO4, 50g / t of collector butyl xanthate + 10g / t of No. 2 oil are added, and zinc roughing is carried out.

[0073] (7) The zinc roughing concentrate obtained in step (6) is introduced into a flotation machine for zinc cleaning. No reagents are added for zinc cleaning. The pulp is adjusted for 3 minutes to obtain the final product, zinc concentrate. The zinc roughing tailings are tailings.

[0074] The flotation results obtained after implementing this method are shown in Table 5.

[0075] Table 5. Flotation Results of “Regrinding and Reagent Removal - Copper-Lead Mixing and Flotation - Copper-Lead Separation - Tailings Zinc Beneficiation”

[0076]

[0077] The copper-lead-zinc mixed concentrate was processed using a regrinding and reagent removal-copper-lead flotation-copper-lead separation-tailings zinc beneficiation process. The resulting copper concentrate had a Cu grade of 20.23% and a Cu recovery rate of 63.06%, the lead concentrate had a Pb grade of 28.83% and a Pb recovery rate of 36.47%, and the zinc concentrate had a Zn grade of 37.56% and a Zn recovery rate of 45.48%. Due to the high degree of lead oxidation, fine particle size, and poor monomer liberation, copper-lead separation was difficult, resulting in high lead-zinc content in the copper concentrate and the inability to produce qualified lead concentrate. Therefore, this method is not suitable for this copper-lead-zinc mixed concentrate.

[0078] The present invention has been described in detail above through specific and preferred embodiments. However, those skilled in the art should understand that the present invention is not limited to the embodiments described above. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for processing complex copper-lead-zinc mixed concentrate, characterized in that, Includes the following steps: (1) The copper-lead-zinc mixed concentrate to be separated by flotation is transported to the grinding system for grinding. Na2S and carbon powder are added during the grinding process. Under the condition that the pulp concentration is 70% to 75%, the particle size of -0.019mm accounts for more than 85%. Then, the carbon powder in the mixed concentrate is removed by filtration. (2) The concentrate obtained by filtration in step (1) is fed into the No. 1 mixing tank, and zinc sulfate 10000g / t and sodium sulfite 10000g / t, which are inhibitors of zinc sulfide, are added. After adjusting the slurry for 3 minutes, it flows into the No. 2 mixing tank, and copper collector Z-200 40g / t is added. After adjusting the slurry for 3 minutes, it is introduced into the flotation machine for copper-zinc sequential flotation to obtain copper roughing concentrate and copper roughing tailings. (3) The copper roughing concentrate slurry obtained in step (2) is introduced into the flotation machine for copper cleaning. 2000g / t zinc sulfate and 2000g / t sodium sulfite inhibitors are added. After adjusting the slurry for 3 minutes, copper concentrate and middlings are obtained. (4) The copper roughing tailings slurry obtained in step (2) is introduced into the flotation machine for two copper scavenging processes. In the first scavenging process, 5000 g / t of zinc sulfate inhibitor, 5000 g / t of sodium sulfite, and 20 g / t of collector Z-200 are added, and the slurry is conditioned for 3 minutes. In the second scavenging process, 2500 g / t of zinc sulfate inhibitor, 2500 g / t of sodium sulfite, and 10 g / t of collector Z-200 are added, and the slurry is conditioned for 3 minutes. The copper scavenging concentrates from copper scavenging one and copper scavenging two are combined and enter the middlings copper roughing process, while the copper scavenging tailings from copper scavenging two enter the zinc roughing process. (5) The middlings obtained in step (3) are subjected to one copper roughing, one copper scavenging, and one copper cleaning. In the copper roughing process, 4000 g / t of zinc sulfate and 4000 g / t of sodium sulfite are added as inhibitors and the pulp is adjusted for 3 minutes. In the copper scavenging process, 2000 g / t of zinc sulfate and 2000 g / t of sodium sulfite and 20 g / t of collector Z-200 are added as inhibitors and the pulp is adjusted for 3 minutes. The copper roughing concentrate and the copper scavenging concentrate are combined and then enter the copper cleaning process. The copper cleaning concentrate and the copper cleaning concentrate are combined to form the final copper concentrate. The copper roughing tailings and the copper scavenging tailings are combined and then enter the zinc roughing process. (6) The copper scavenging tailings obtained in step (4) and the middlings copper roughing tailings and middlings copper scavenging tailings obtained in step (5) are combined and put into the No. 3 mixing tank. The pH value is adjusted to 5.

5. Add 500g / t of zinc sulfide activator copper sulfate, 10g / t of foaming agent No. 2 oil, and 50g / t of collector butyl xanthate to the No. 4 mixing tank. Adjust the slurry for 3 minutes and carry out zinc roughing to obtain zinc roughing concentrate and zinc roughing tailings. (7) The zinc roughing concentrate obtained in step (6) is introduced into the flotation machine for two zinc cleaning processes. In the first zinc cleaning process, 5g / t of frother No. 2 oil is added and the slurry is adjusted for 3 minutes. In the second zinc cleaning process, no reagent is added and the slurry is adjusted for 3 minutes to obtain the final product zinc concentrate. The tailings from the first zinc cleaning process are returned to the zinc roughing process, and the tailings from the second zinc cleaning process are returned to the first zinc cleaning process. (8) The zinc roughing tailings obtained in step (6) are introduced into the flotation machine for zinc scavenging. Frothing agent No. 2 oil 5g / t + butyl xanthate 25g / t are added to the zinc scavenging, and the slurry is adjusted for 3 minutes to obtain zinc scavenging concentrate and zinc scavenging tailings. The zinc scavenging concentrate enters the zinc roughing process. (9) The zinc scavenging tailings obtained in step (8) are introduced into a flotation machine for lead roughing. 3000g / t of lime, 1000g / t of Na2S, 600g / t of water glass, 60g / t of butyl xanthate, 60g / t of sodium oleate, and 4g / t of No. 2 oil are added for lead roughing to obtain lead roughing concentrate and lead roughing tailings. (10) The lead roughing concentrate obtained in step (9) is introduced into the flotation machine for two lead cleanings. In the first lead cleaning, 100g / t of water glass is added and the pulp is adjusted for 3 minutes. In the second cleaning, no reagent is added and the pulp is adjusted for 3 minutes to obtain the final product, lead-rich medium ore. The tailings from the first lead cleaning are returned to the lead roughing process, and the tailings from the second lead cleaning are returned to the first lead cleaning process. (11) The lead roughing tailings obtained in step (9) are introduced into the flotation machine for lead scavenging. 400g / t of Na2S, 300g / t of water glass, 30g / t of butyl xanthate, 30g / t of sodium oleate, and 1g / t of No. 2 oil are added for lead scavenging. The lead scavenging concentrate is returned to the lead roughing process, and the lead scavenging tailings are the final tailings.

2. The method for processing complex copper-lead-zinc mixed concentrate according to claim 1, characterized in that, In step (1), the amount of Na2S and carbon powder added during the grinding process is 1000g / t.

3. The method for processing complex copper-lead-zinc mixed concentrate according to claim 1, characterized in that, The pH value in step (6) is adjusted by adding dilute sulfuric acid.

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