A beneficiation method for lead-zinc separation in lead-zinc sulfide ores containing very low levels of copper sulfide.

Abstract

This invention provides a beneficiation method for separating lead and zinc in lead-zinc sulfide ores containing extremely low levels of copper sulfide. The method involves pretreatment of the slurry with a heavy metal ion shielding agent, stirring with an active zinc sphalerite remover, and finally adding a collector to capture the lead minerals. The process is environmentally friendly and has good applicability. When processing lead-zinc sulfide ores with a copper grade of no more than 0.05%, the lead concentrate has a lead grade of over 60%, the zinc grade is no more than 6%, and the lead recovery rate is over 90%. The zinc concentrate has a zinc grade of over 42%, and the zinc recovery rate is over 90%.

Description

Technical Field

[0001] This invention belongs to the field of metallurgy, and specifically relates to a beneficiation method for separating lead and zinc in lead-zinc sulfide ores containing extremely low levels of copper sulfide. Background Technology

[0002] Copper-lead-zinc polymetallic ores typically contain a variety of valuable metals. Through comprehensive recycling and utilization, resource utilization efficiency can be improved, resource waste can be reduced, and the environmental burden can also be lowered.

[0003] Because the ore contains copper sulfide minerals, with the passage of time, under the influence of natural environmental factors such as weathering or contact with groundwater, the copper minerals undergo slight surface oxidation, leading to the precipitation of copper ions and initial activation of the sphalerite. Since lead sulfide and zinc sulfide share certain similarities in crystal structure and chemical composition, they are often intercalated together in fine or micro-grain form, creating a complex intergrowth relationship. This results in significant differences in lead and zinc sulfide particle size after grinding, with varying floatability, making the separation of lead and zinc sulfide difficult. Therefore, the development of new beneficiation processes is of great significance for complex polymetallic ores, especially copper-lead-zinc polymetallic ores. Summary of the Invention

[0004] The purpose of this invention is to provide a beneficiation method for separating lead and zinc in lead-zinc sulfide ores containing extremely low levels of copper sulfide.

[0005] The objective of this invention is achieved as follows: the beneficiation method for separating lead and zinc in lead-zinc sulfide ores containing extremely low copper sulfide includes pretreatment, lead concentrate preparation, and zinc concentrate preparation steps, specifically including:

[0006] A. Pretreatment: Grind the lead-zinc sulfide ore containing very low copper sulfide to 70-75% of -0.074mm, add heavy metal ion shielding agent, and add water to adjust the slurry concentration to 70-80% to obtain material a.

[0007] B. Lead concentrate preparation:

[0008] 1) Add sphalerite active remover to material a and stir for 2-4 minutes, then add lead collector and perform flotation to obtain lead rough concentrate b and flotation tailings c;

[0009] 2) The lead rough concentrate b is processed through three-stage beneficiation to obtain the final lead concentrate h and the beneficiation tailings. The beneficiation tailings are returned to the previous step for recycling.

[0010] 3) The flotation tailings c are subjected to secondary scavenging to obtain secondary scavenging tailings m and scavenging concentrate. The scavenging concentrate is returned to the previous step for recycling.

[0011] C. Zinc concentrate preparation:

[0012] 1) Add activator, zinc collector and frother to the secondary scavenging tailings m and carry out flotation to obtain zinc rough concentrate n and zinc rough tailings o;

[0013] 2) The zinc crude concentrate n is processed through three-stage beneficiation to obtain the final zinc concentrate t and the beneficiated tailings. The beneficiated tailings are returned to the previous step for recycling.

[0014] 3) The zinc roughing tailings o are subjected to secondary scavenging to obtain scavenged concentrate and final tailings y. The scavenged concentrate is returned to the previous step for recycling.

[0015] The specific steps are as follows:

[0016] Step 1, Slurry pretreatment: Heavy metal ion shielding agent is added to lead-zinc sulfide ore containing very low copper sulfide, water is added to adjust the slurry concentration to 75%, and the ore is ground to -0.074mm to account for 70~75% to obtain material a;

[0017] Step 2, lead concentrate preparation;

[0018] Step 2.1, Lead roughing: Add sphalerite active remover to material a and stir for 3 minutes, then add lead collector and perform flotation to obtain lead rough concentrate b and flotation tailings c;

[0019] Step 2.2, Lead primary beneficiation: The lead rough concentrate b is ground and stripped by a stirring mill to clean the ore surface, and zinc inhibitor is added for primary beneficiation to obtain primary lead concentrate d and primary beneficiation tailings e. The primary beneficiation tailings e are returned to step 2.1 lead roughing.

[0020] Step 2.3, Secondary lead refining: Add zinc inhibitor to primary lead concentrate d for secondary refining to obtain secondary lead concentrate f and secondary refining tailings g. Secondary refining tailings g are returned to step 2.2, primary lead refining.

[0021] Step 2.4, Lead Tertiary Cleaning: Add zinc inhibitor to the secondary lead concentrate f for tertiary cleaning to obtain the final lead concentrate h and tertiary cleaned tailings i. The tertiary cleaned tailings i are returned to Step 2.3 Lead Primary Cleaning.

[0022] Step 2.5, Lead primary scavenging: Add lead collector to flotation tailings c for primary scavenging to obtain primary scavenging concentrate j and primary scavenging tailings k. Primary scavenging concentrate j is returned to step 2.1 lead roughing.

[0023] Step 2.6, Lead secondary scavenging: Add lead collector to the primary scavenging concentrate tailings k for secondary scavenging to obtain secondary scavenging concentrate l and secondary scavenging tailings m. Secondary scavenging concentrate l is returned to step 2.5 lead primary scavenging.

[0024] Step 3, zinc concentrate preparation;

[0025] Step 3.1, Zinc roughing: Add activator, zinc collector and frother to the secondary scavenging tailings m to carry out zinc roughing to obtain zinc rough concentrate n and zinc roughing tailings o;

[0026] Step 3.2, Zinc Primary Concentration: The zinc rough concentrate n is subjected to blank concentration to obtain primary zinc concentrate p and primary zinc concentrate tailings q. The primary zinc concentrate tailings q are returned to step 3.1, zinc rough concentration.

[0027] Step 3.3, Secondary zinc refining: The primary zinc concentrate p is subjected to blank refining to obtain secondary zinc concentrate r and secondary zinc refining tailings s. The secondary zinc refining tailings s are returned to step 3.2, primary zinc refining.

[0028] Step 3.4, Zinc Tertiary Refinement: The secondary zinc concentrate r is subjected to blank refinement to obtain the final zinc concentrate t and the tertiary zinc refinement tailings u. The tertiary zinc refinement tailings u are returned to Step 3.3, Zinc Secondary Refinement.

[0029] Step 3.5, Zinc primary scavenging: Add activator, zinc collector and frother to zinc roughing tailings o and carry out primary scavenging to obtain primary zinc concentrate v and primary zinc tailings w. Primary zinc tailings w are returned to step 3.1 zinc roughing.

[0030] Step 3.6, Secondary zinc scavenging: Activator, zinc collector and frother are added to the primary zinc scavenging concentrate v for secondary scavenging to obtain secondary zinc scavenging concentrate x and final tailings y. Secondary zinc scavenging concentrate x is returned to step 3.5, primary zinc scavenging.

[0031] Furthermore, in step 1, the slurry pretreatment, the heavy metal ion shielding agent is ZP, with an addition amount of 500 g / t. The ZP is composed of sodium sulfide, sodium carbonate, and citric acid in a ratio of 1:5:5.

[0032] Further, in step 2.1 lead roughing, the active remover for sphalerite is sodium dimethyl dithiocarbamate: sodium pyrophosphate: zinc sulfate = 1:3:6, with an addition amount of 1000 g / t and a stirring time of 3-5 min; the lead collector is sodium ethyl black, with an addition amount of 50 g / t and a stirring time of 1-2 min. After the reagents are added and stirred, the lead roughing time is 3-5 min.

[0033] Furthermore, in the primary lead refining, the secondary lead refining in step 2.3, and the tertiary lead refining in step 2.4, the zinc inhibitor is zinc sulfate:sodium sulfite = 4:1, the addition amount is 200g / t, the stirring time is 3-5min, and the refining time for each stage of lead is 3min.

[0034] Furthermore, in step 2.5, the lead primary scavenging, and step 2.6, the lead collector is ethyl xanthate:isopropyl xanthate = 2:1, with an addition amount of 20 g / t, a stirring time of 1-2 min, and a lead scavenging time of 3 min for each stage.

[0035] Furthermore, in step 3, the zinc concentrate preparation process, the activator is copper sulfate:ammonium chloride = 5:1; the collector is butyl xanthate:isobutyl thiocyanate = 1:1; and the frother is methyl isobutyl methanol:propylene glycol butyl ether = 1:1.

[0036] Furthermore, in step 3.1, during the zinc roughing process, the activator is added at a rate of 200 g / t, and the stirring time is 3 min; the collector is added at a rate of 100 g / t, and the stirring time is 1–2 min; the foaming agent is added at a rate of 20 g / t, and the stirring time is 1 min.

[0037] Furthermore, in step 3.3, during the primary zinc scavenging, the activator addition amount is 100 g / t; the stirring time is 3 min; the zinc collector addition amount is 50 g / t; the stirring time is 1 min; and the frother addition amount is 10 g / t; the stirring time is 1 min. In step 3.4, during the secondary zinc scavenging, the activator addition amount is 50 g / t; the stirring time is 3 min; the zinc collector addition amount is 30 g / t; the stirring time is 1 min; and the frother addition amount is 10 g / t; the stirring time is 1 min. The scavenging time for each zinc stage is 2 min.

[0038] Compared with existing technologies, the present invention has the following beneficial effects:

[0039] The process of this invention is simple, easy to operate, energy-saving, environmentally friendly, and has good applicability. The mineral processing method treats lead-zinc sulfide ores with a copper grade of no more than 0.05%, producing lead concentrate with a lead grade of over 60% and zinc grade of no more than 6%, achieving a lead recovery rate of over 90%; and zinc concentrate with a zinc grade of over 42%, achieving a zinc recovery rate of over 90%. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the process flow of the present invention. Detailed Implementation

[0041] The present invention will be further described below with reference to embodiments, but this is not intended to limit the present invention in any way. Any modifications or substitutions made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0042] The beneficiation method for lead-zinc separation in lead-zinc sulfide ores containing extremely low copper sulfide, as described in this invention, includes pretreatment, lead concentrate preparation, and zinc concentrate preparation steps, specifically including:

[0043] A. Pretreatment: Grind the lead-zinc sulfide ore containing very low copper sulfide to 70-75% of -0.074mm, add heavy metal ion shielding agent, and add water to adjust the slurry concentration to 70-80% to obtain material a.

[0044] B. Lead concentrate preparation:

[0045] 1) Add sphalerite active remover to material a and stir for 2-4 minutes, then add lead collector and perform flotation to obtain lead rough concentrate b and flotation tailings c;

[0046] 2) The lead rough concentrate b is processed through three-stage beneficiation to obtain the final lead concentrate h and the beneficiation tailings. The beneficiation tailings are returned to the previous step for recycling.

[0047] 3) The flotation tailings c are subjected to secondary scavenging to obtain secondary scavenging tailings m and scavenging concentrate. The scavenging concentrate is returned to the previous step for recycling.

[0048] C. Zinc concentrate preparation:

[0049] 1) Add activator, zinc collector and frother to the secondary scavenging tailings m and carry out flotation to obtain zinc rough concentrate n and zinc rough tailings o;

[0050] 2) The zinc crude concentrate n is processed through three-stage beneficiation to obtain the final zinc concentrate t and the beneficiated tailings. The beneficiated tailings are returned to the previous step for recycling.

[0051] 3) The zinc roughing tailings o are subjected to secondary scavenging to obtain scavenged concentrate and final tailings y. The scavenged concentrate is returned to the previous step for recycling.

[0052] The three-stage refining process described in step 2) involves grinding and cleaning the surface of lead rough concentrate b using a stirred mill, adding a zinc inhibitor for primary refining to obtain primary lead concentrate d and primary refined tailings e, with the primary refined tailings e returned to the lead roughing step; adding a zinc inhibitor to primary lead concentrate d for secondary refining to obtain secondary lead concentrate f and secondary refined tailings g, with the secondary refined tailings g returned to the primary lead refining step; and adding a zinc inhibitor to secondary lead concentrate f for tertiary refining to obtain final lead concentrate h and tertiary refined tailings i, with the tertiary refined tailings i returned to the primary lead refining step.

[0053] The secondary scavenging described in step 3) involves adding a lead collector to flotation tailings c for primary scavenging to obtain primary scavenging concentrate j and primary scavenging tailings k. Primary scavenging concentrate j is returned to the lead roughing step. Primary scavenging concentrate tailings k are added to a lead collector for secondary scavenging to obtain secondary scavenging concentrate l and secondary scavenging tailings m. Secondary scavenging concentrate l is returned to the primary lead scavenging step.

[0054] The three-stage refining process described in step 2) involves performing blank refining on the zinc rough concentrate n to obtain primary zinc concentrate p and primary zinc tailings q. The primary zinc tailings q are returned to the zinc rough concentrate step. The primary zinc concentrate p is then subjected to blank refining to obtain secondary zinc concentrate r and secondary zinc tailings s. The secondary zinc tailings s are returned to the primary zinc refining step. The secondary zinc concentrate r is then subjected to blank refining to obtain final zinc concentrate t and tertiary zinc tailings u. The tertiary zinc tailings u are returned to the secondary zinc refining step.

[0055] The secondary scavenging described in step 3) involves adding an activator, a zinc collector, and a frother to the zinc roughing tailings o for primary zinc scavenging to obtain primary zinc scavenged concentrate v and primary zinc scavenged tailings w. The primary zinc scavenged tailings w are returned to the zinc roughing step. The primary zinc scavenged concentrate v is then added to an activator, a zinc collector, and a frother for secondary zinc scavenging to obtain secondary zinc scavenged concentrate x and final tailings y. The secondary zinc scavenged concentrate x is returned to the primary zinc scavenging step.

[0056] The heavy metal ion shielding agent is ZP, which is composed of sodium sulfide, sodium carbonate and citric acid, with a mass ratio of sodium sulfide, sodium carbonate and citric acid of (0.5~1.5):(4~6):(4~6).

[0057] The zincblende active remover is composed of sodium dimethyl dithiocarbamate, sodium pyrophosphate, and zinc sulfate in a mass ratio of (0.5~1.5):(2~4):(5~7).

[0058] The zinc inhibitor is composed of zinc sulfate and sodium sulfite in a mass ratio of (3~5):1.

[0059] The lead collector is composed of ethyl xanthate and isopropyl xanthate in a mass ratio of (1~3):1.

[0060] The activator mentioned in step 1) is composed of copper sulfate and ammonium chloride in a mass ratio of (4~6):1; the zinc collector is composed of butyl xanthate and isobutyl thiocyanate in a mass ratio of 1:1; and the foaming agent is composed of methyl isobutyl methanol and propylene glycol butyl ether in a mass ratio of 1:1.

[0061] The invention will be further illustrated below with specific implementation examples:

[0062] Example 1

[0063] This embodiment uses a mineral sample from Qinghai Province as the research object and employs a lead-zinc separation and beneficiation method for lead-zinc sulfide ores containing extremely low levels of copper sulfide. The specific steps are as follows:

[0064] 1. Properties of the raw ore

[0065] A mineral sample from Qinghai Province contains 0.048% copper, 1.45% lead, and 2.64% zinc. The main useful minerals are chalcopyrite, galena, and sphalerite.

[0066] 2. Mineral processing methods

[0067] Step 1, Pretreatment: Add 500g / t of sodium sulfide:sodium carbonate:citric acid in a ratio of 1:5:5 to the ore, add water to adjust the slurry concentration to 75%, and grind the ore to -0.074mm (70%) to obtain material a;

[0068] Step 2, lead concentrate preparation;

[0069] Step 2.1, Lead roughing: Add 1000g / t of a combination reagent with a ratio of sodium dimethyl dithiocarbamate: sodium pyrophosphate: zinc sulfate = 1:3:6 to material a. After stirring for 3 minutes, add 50g / t of lead collector ethyl sodium black powder. Stir for 1-2 minutes. After the reagent addition and stirring are completed, the lead roughing time is 3 minutes to obtain lead concentrate b and flotation tailings c.

[0070] Step 2.2, Lead primary beneficiation: The lead rough concentrate b is ground and stripped to clean the ore surface by stirring mill. 200g / t of zinc inhibitor with a ratio of zinc sulfate:sodium sulfite = 4:1 is added. After stirring for 3 minutes, primary beneficiation is carried out for 3 minutes to obtain primary lead concentrate d and primary beneficiation tailings e. Primary beneficiation tailings e are returned to step 2.1 lead roughing.

[0071] Step 2.3, Secondary lead refining: Add 200g / t of zinc inhibitor (zinc sulfate: sodium sulfite = 4:1) to the primary lead concentrate d, stir for 3 minutes, and then perform secondary refining for 3 minutes to obtain secondary lead concentrate f and secondary refining tailings g. The secondary refining tailings g are returned to step 2.2, primary lead refining.

[0072] Step 2.4, Lead Tertiary Concentration: Add 200g / t of zinc inhibitor with a ratio of zinc sulfate:sodium sulfite = 4:1 to the secondary lead concentrate f, stir for 3 minutes, and then carry out tertiary concentration for 3 minutes to obtain the final lead concentrate h and tertiary concentration tailings i. The tertiary concentration tailings i are returned to Step 2.3 Lead Primary Concentration.

[0073] Step 2.5, Lead primary scavenging: Add 20g / t of lead collector with a ratio of ethyl xanthate:isopropyl xanthate = 2:1 to flotation tailings c, stir for 1min, and carry out primary scavenging to obtain primary scavenging concentrate j and primary scavenging tailings k. Primary scavenging concentrate j is returned to step 2.1 lead roughing.

[0074] Step 2.6, Secondary lead scavenging: 20 g / t of lead collector with a ratio of ethyl xanthate:isopropyl xanthate = 2:1 is added to the primary scavenging concentrate k, and the stirring time is 1 min. The secondary scavenging yields secondary scavenging concentrate l and secondary scavenging tailings m. Secondary scavenging concentrate l is returned to step 2.5, primary lead scavenging.

[0075] Step 3, zinc concentrate preparation;

[0076] Step 3.1, Zinc roughing: Add 200 g / t of activator with a ratio of copper sulfate:ammonium chloride = 5:1 to the secondary scavenging tailings m; stir for 3 min; then add 100 g / t of zinc collector with a ratio of butyl xanthate:isobutyl thiocyanate = 1:1; stir for 1 min; then add 20 g / t of frother with a ratio of methyl isobutyl methanol:propylene glycol butyl ether = 1:1; stir for 1 min; finally, perform zinc roughing for 3 min to obtain zinc rough concentrate n and zinc roughing tailings o.

[0077] Step 3.2, Zinc primary concentrate: Perform blank concentrate for 3 minutes on zinc rough concentrate n to obtain primary zinc concentrate p and primary zinc concentrate tailings q. The primary zinc concentrate tailings q are returned to step 3.1 zinc rough concentrate.

[0078] Step 3.3, Secondary zinc refining: The primary zinc concentrate p undergoes a 3-minute blank refining process to obtain secondary zinc concentrate r and secondary zinc refining tailings s. The secondary zinc refining tailings s are then returned to step 3.2, primary zinc refining.

[0079] Step 3.4, Zinc Tertiary Refinement: The secondary zinc concentrate r undergoes a 3-minute blank refinement to obtain the final zinc concentrate t and the tertiary zinc refinement tailings u. The tertiary zinc refinement tailings u are returned to Step 3.3, Zinc Secondary Refinement.

[0080] Step 3.5, Zinc primary scavenging: Add 100g / t of activator with a ratio of copper sulfate:ammonium chloride = 5:1 to the zinc roughing tailings o; stir for 3 min; then add 50g / t of zinc collector with a ratio of butyl xanthate:isobutyl thiocyanate = 1:1; stir for 1 min; then add 10g / t of frother with a ratio of methyl isobutyl methanol:propylene glycol butyl ether = 1:1; stir for 1 min, and perform zinc primary scavenging for 2 min to obtain primary zinc concentrate v and primary zinc tailings w. The primary zinc tailings w are returned to step 3.1 zinc roughing.

[0081] Step 3.6, Secondary zinc scavenging: Add 50 g / t of activator (copper sulfate:ammonium chloride = 5:1) to the primary zinc scavenging concentrate v; stir for 3 min; then add 30 g / t of zinc collector (butyl xanthate:isobutyl thiocyanate = 1:1); stir for 1 min; then add 10 g / t of frother (methyl isobutyl methanol:propylene glycol butyl ether = 1:1); stir for 1 min, and perform secondary zinc scavenging for 2 min to obtain secondary zinc scavenging concentrate x and final tailings y. Secondary zinc scavenging concentrate x is returned to step 3.5, primary zinc scavenging.

[0082] Using this process to process the ore, the following good indicators can be obtained: lead concentrate with a lead grade of 60.12%, zinc grade of 5.89%, and lead recovery rate of 94.72%; and zinc concentrate with a zinc grade of 44.32% and zinc recovery rate of 90.56%.

[0083] Example 2

[0084] This embodiment uses a mineral sample from Tengchong as the research object and adopts a lead-zinc separation and beneficiation method for lead-zinc sulfide ores containing extremely low copper sulfide. The specific steps are as follows:

[0085] 1. Properties of the raw ore

[0086] A mineral sample from Tengchong contains 0.056% copper, 2.73% lead, and 2.95% zinc. The main useful minerals are chalcopyrite, galena, and sphalerite.

[0087] 2. Mineral processing methods

[0088] Step 1, Pretreatment: Add 500g / t of sodium sulfide:sodium carbonate:citric acid in a ratio of 1:5:5 to the ore, add water to adjust the slurry concentration to 80%, and grind the ore to -0.074mm (70%) to obtain material a;

[0089] Step 2, lead concentrate preparation;

[0090] Step 2.1, Lead roughing: Add 600g / t of a combination reagent with a ratio of sodium dimethyl dithiocarbamate: sodium pyrophosphate: zinc sulfate = 1:3:6 to material a. After stirring for 3 minutes, add 40g / t of lead collector ethyl sodium black powder. Stir for 2 minutes. After the reagents are added and stirred, the lead roughing time is 4 minutes to obtain lead concentrate b and flotation tailings c.

[0091] Step 2.2, Lead primary beneficiation: The lead rough concentrate b is ground and stripped to clean the ore surface by stirring mill. 200g / t of zinc inhibitor with a ratio of zinc sulfate:sodium sulfite = 4:1 is added. After stirring for 3 minutes, primary beneficiation is carried out for 3 minutes to obtain primary lead concentrate d and primary beneficiation tailings e. Primary beneficiation tailings e are returned to step 2.1 lead roughing.

[0092] Step 2.3, Secondary lead refining: Add 100g / t of zinc inhibitor (zinc sulfate: sodium sulfite = 4:1) to the primary lead concentrate d, stir for 3 minutes, and then perform secondary refining for 3 minutes to obtain secondary lead concentrate f and secondary refining tailings g. The secondary refining tailings g are returned to step 2.2, primary lead refining.

[0093] Step 2.4, Lead Tertiary Concentration: Add 100g / t of zinc inhibitor with a ratio of zinc sulfate:sodium sulfite = 4:1 to the secondary lead concentrate f, stir for 3 minutes, and then carry out tertiary concentration for 3 minutes to obtain the final lead concentrate h and tertiary concentration tailings i. The tertiary concentration tailings i are returned to Step 2.3 Lead Primary Concentration.

[0094] Step 2.5, Lead primary scavenging: Add 20g / t of lead collector with a ratio of ethyl xanthate:isopropyl xanthate = 2:1 to flotation tailings c, stir for 1min, and carry out primary scavenging to obtain primary scavenging concentrate j and primary scavenging tailings k. Primary scavenging concentrate j is returned to step 2.1 lead roughing.

[0095] Step 2.6, Secondary lead scavenging: Add 20g / t of lead collector with a ratio of ethyl xanthate:isopropyl xanthate = 2:1 to the primary scavenging tailings k, and stir for 1min. The secondary scavenging yields secondary scavenging concentrate l and secondary scavenging tailings m. Secondary scavenging concentrate l is returned to step 2.5, primary lead scavenging.

[0096] Step 3, zinc concentrate preparation;

[0097] Step 3.1, Zinc roughing: Add 250 g / t of activator (copper sulfate:ammonium chloride = 5:1) to the secondary scavenging tailings m; stir for 3 min; then add 60 g / t of zinc collector (butyl xanthate:isobutyl thiocyanate = 1:1) and stir for 1 min; then add 20 g / t of frother (methyl isobutyl methanol:propylene glycol butyl ether = 1:1) and stir for 1 min; finally, perform zinc roughing for 3 min to obtain zinc rough concentrate n and zinc roughing tailings o.

[0098] Step 3.2, Zinc primary concentrate: Perform blank concentrate for 3 minutes on zinc rough concentrate n to obtain primary zinc concentrate p and primary zinc concentrate tailings q. The primary zinc concentrate tailings q are returned to step 3.1 zinc rough concentrate.

[0099] Step 3.3, Secondary zinc refining: The primary zinc concentrate p undergoes a 3-minute blank refining process to obtain secondary zinc concentrate r and secondary zinc refining tailings s. The secondary zinc refining tailings s are then returned to step 3.2, primary zinc refining.

[0100] Step 3.4, Zinc Tertiary Refinement: The secondary zinc concentrate r undergoes a 3-minute blank refinement to obtain the final zinc concentrate t and the tertiary zinc refinement tailings u. The tertiary zinc refinement tailings u are returned to Step 3.3, Zinc Secondary Refinement.

[0101] Step 3.5, Zinc primary scavenging: Add 80 g / t of activator with a ratio of copper sulfate:ammonium chloride = 5:1 to the zinc roughing tailings o; stir for 3 min; then add 30 g / t of zinc collector with a ratio of butyl xanthate:isobutyl thiocyanate = 1:1; stir for 1 min; then add 10 g / t of frother with a ratio of methyl isobutyl methanol:propylene glycol butyl ether = 1:1; stir for 1 min, and perform zinc primary scavenging for 2 min to obtain primary zinc concentrate v and primary zinc tailings w. The primary zinc tailings w are returned to step 3.1 zinc roughing.

[0102] Step 3.6, Secondary zinc scavenging: Add 40 g / t of activator with a ratio of copper sulfate:ammonium chloride = 5:1 to the primary zinc scavenging concentrate v; stir for 3 min; then add 20 g / t of zinc collector with a ratio of butyl xanthate:isobutyl thiocyanate = 1:1; stir for 1 min; then add 10 g / t of frother with a ratio of methyl isobutyl methanol:propylene glycol butyl ether = 1:1; stir for 1 min, and perform secondary zinc scavenging for 2 min to obtain secondary zinc scavenging concentrate x and final tailings y. Secondary zinc scavenging concentrate x is returned to step 3.5, primary zinc scavenging.

[0103] Using this process to process the ore, the lead concentrate can achieve a lead grade of 68.97%, a zinc grade of 5.40%, and a lead recovery rate of 91.66%; the zinc concentrate can achieve a zinc grade of 51.03% and a zinc recovery rate of 90.42%, which are all satisfactory results.

[0104] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A beneficiation process for the separation of lead and zinc from a lead-zinc sulphide ore containing very low sulphidic copper, characterized in that, The beneficiation method for lead-zinc separation of the lead-zinc sulfide ore containing extremely low sulfur copper includes pretreatment, lead concentrate preparation and zinc concentrate preparation steps, and specifically comprises the following steps: A, pretreatment: grinding the lead-zinc sulfide ore containing extremely low sulfur copper to be treated to 70-75% of -0.074 mm, then adding (0.5-1.5):(4-6):(4-6) of a heavy metal ion shielding agent ZP composed of sodium sulfide, sodium carbonate and citric acid, and adding clean water to adjust the pulp concentration value to 70-80% to obtain material a; B, lead concentrate preparation: 1) adding (0.5-1.5):(2-4):(5-7) of a sphalerite activity removal agent composed of sodium dimethyl dithiocarbamate, sodium pyrophosphate and zinc sulfate to the material a, stirring for 2-4 min, adding a lead collector for flotation to obtain lead rough concentrate b and flotation tailings c; 2) obtaining final lead concentrate h and cleaning tailings by three-stage cleaning of the lead rough concentrate b, and the cleaning tailings are returned to the previous step for circulation; 3) obtaining secondary cleaning tailings m and cleaning concentrate by two-stage scavenging of the flotation tailings c, and the cleaning concentrate is returned to the previous step for circulation; C, zinc concentrate preparation: 1) adding an activator composed of copper sulfate and ammonium chloride in a mass ratio of (4-6):1, a zinc collector composed of butyl xanthate and isobutyl thiocarbamate in a mass ratio of 1:1, and a foaming agent composed of methyl isobutyl carbinol and propylene glycol butyl ether in a mass ratio of 1:1 to the secondary cleaning tailings m for flotation to obtain zinc rough concentrate n and zinc roughing tailings o; 2) obtaining final zinc concentrate t and cleaning tailings by three-stage cleaning of the zinc rough concentrate n, and the cleaning tailings are returned to the previous step for circulation; 3) obtaining cleaning concentrate and final tailings y by two-stage scavenging of the zinc roughing tailings o, and the cleaning concentrate is returned to the previous step for circulation.

2. The beneficiation process for low sulphidation copper bearing lead-zinc sulphide ore for separation of lead and zinc as claimed in claim 1 wherein, The three-stage cleaning in step 2) of B is that the lead rough concentrate b is stripped and cleaned by stirring and grinding the ore surface, a zinc inhibitor is added for first-stage cleaning to obtain first-stage lead concentrate d and first-stage cleaning tailings e, the first-stage cleaning tailings e are returned to the lead roughing step; a zinc inhibitor is added to the first-stage lead concentrate d for second-stage cleaning to obtain second-stage lead concentrate f and second-stage cleaning tailings g, the second-stage cleaning tailings g are returned to the lead first-stage cleaning step; a zinc inhibitor is added to the second-stage lead concentrate f for third-stage cleaning to obtain final lead concentrate h and third-stage cleaning tailings i, and the third-stage cleaning tailings i are returned to the lead first-stage cleaning step.

3. The beneficiation process for low sulphidation copper bearing lead-zinc sulphide ore for separation of lead and zinc as claimed in claim 1 wherein, The two-stage scavenging in step 3) of B is that a lead collector is added to the flotation tailings c for first-stage scavenging to obtain first-stage scavenging concentrate j and first-stage scavenging tailings k, and the first-stage scavenging concentrate j is returned to the lead roughing step; a lead collector is added to the first-stage scavenging tailings k for second-stage scavenging to obtain second-stage scavenging concentrate l and second-stage scavenging tailings m, and the second-stage scavenging concentrate l is returned to the lead first-stage scavenging step.

4. The beneficiation process for low sulphidation copper bearing lead-zinc sulphide ore for separation of lead and zinc as claimed in claim 1 wherein, The tertiary selection in step 2) is that the zinc rough selection concentrate n is subjected to blank selection to obtain a primary zinc concentrate p and a primary zinc selection tailing q, the primary zinc selection tailing q is returned to the zinc rough selection step; the primary zinc concentrate p is subjected to blank selection to obtain a secondary zinc concentrate r and a secondary zinc selection tailing s, the secondary zinc selection tailing s is returned to the primary zinc selection step; the secondary zinc concentrate r is subjected to blank selection to obtain a final zinc concentrate t and a tertiary zinc selection tailing u, the tertiary zinc selection tailing u is returned to the secondary zinc selection step.

5. The beneficiation process for low sulphidation copper bearing lead-zinc sulphide ore for separation of lead and zinc as claimed in claim 1 wherein, The secondary scavenging in step 3) is that the zinc rough selection tailing o is added with an activator, a zinc collector and a foaming agent to obtain a primary zinc scavenging concentrate v and a primary zinc scavenging tailing w, the primary zinc scavenging tailing w is returned to the zinc rough selection step; the primary zinc scavenging concentrate v is added with an activator, a zinc collector and a foaming agent to obtain a secondary zinc scavenging concentrate x and a final tailing y, the secondary zinc scavenging concentrate x is returned to the primary zinc scavenging step.

6. The beneficiation process for low sulphidation copper bearing lead-zinc sulphide ore for separation of lead and zinc as claimed in claim 2 wherein, The zinc depressor is composed of zinc sulfate and sodium sulfite with a mass ratio of (3-5):

1.

7. The beneficiation process for low sulphidation copper bearing lead-zinc sulphide ore for separation of lead and zinc as claimed in claim 3 wherein, The lead collector is composed of ethyl xanthate and isopropyl xanthate with a mass ratio of (1-3):1.

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