Beneficiation method for lead-zinc separation of lead-zinc sulfide ore containing extremely low copper sulfide

Abstract

According to the beneficiation method for lead-zinc separation of the lead-zinc sulfide ore containing the extremely low copper sulfide content, the ore pulp is pretreated through the heavy metal ion shielding agent, the zinc blende activity removing agent is added and stirred, and finally the collecting agent is added for collecting the lead ore, the technology is environmentally friendly, and applicability is good. When the lead-zinc sulfide ore with the copper grade not larger than 0.05% is treated, the lead grade of the lead concentrate is 60% or above, the zinc grade is not larger than 6%, the lead recovery rate is 90% or above, the zinc grade of the zinc concentrate is 42% or above, and the zinc recovery rate is 90% or above.

Description

Technical Field

[0001] The invention belongs to the field of metallurgy, and in particular relates to a beneficiation method for separating lead and zinc from a lead-zinc sulfide ore containing extremely low copper sulfide. Background Art

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

[0003] Since the ore contains copper sulfide minerals, as the mineral formation time increases, under the influence of natural environmental factors such as exposed weathering or groundwater immersion, the copper minerals will slightly oxidize the surface, resulting in the precipitation of copper ions and the initial activation of sphalerite. Since lead sulfide and zinc sulfide have certain similarities in crystal structure and chemical composition, they are often embedded together in the form of fine or micro-fine particles, forming a complex embedding relationship, resulting in large differences in the particle size of lead and zinc sulfide after grinding, and the floatability of different particle sizes is staggered, which makes it difficult to separate lead sulfide and zinc sulfide. For complex polymetallic ores, especially copper-lead-zinc polymetallic ores, it is of great significance to develop new mineral processing technology research. Summary of the invention

[0004] The object of the present invention is to provide a beneficiation method for separating lead and zinc from a lead-zinc sulfide ore containing extremely low copper sulfide.

[0005] The object of the present invention is achieved in that the lead-zinc sulfide ore containing extremely low copper sulfide is separated from the lead-zinc ore by a beneficiation method, which comprises the steps of pretreatment, lead concentrate preparation, and zinc concentrate preparation, and specifically comprises: A. Pretreatment: Grind the lead-zinc sulfide ore containing extremely low copper sulfide to be treated to -0.074mm, accounting for 70-75%, add heavy metal ion shielding agent, add clean water to adjust the pulp concentration to 70-80% to obtain material a; B. Preparation of lead concentrate: 1) Add sphalerite activity remover to material a and stir for 2-4 minutes, then add lead collector for flotation to obtain lead rough concentrate b and flotation tailings c; 2) The lead rough concentrate b is subjected to three-stage concentration to obtain the final lead concentrate h and concentrated tailings, and the concentrated tailings are returned to the previous step for circulation; 3) The flotation tailings c are subjected to secondary scavenging to obtain secondary scavenging tailings m and scavenging concentrates, and the scavenging concentrates are returned to the previous step for circulation; C. Preparation of zinc concentrate: 1) Adding an activator, a zinc collector and a frother to the secondary scavenging tailings m for flotation to obtain zinc rough concentrate n and zinc rougher tailings o; 2) The zinc rough concentrate n is subjected to three-stage concentration to obtain the final zinc concentrate t and the concentrated tailings, and the concentrated tailings are returned to the previous step for circulation; 3) The zinc rougher tailings o are subjected to secondary scavenging to obtain scavenged concentrate and final tailings y, and the scavenged concentrate is returned to the previous step for circulation.

[0006] The specific operations are as follows: Step 1, slurry pretreatment: heavy metal ion shielding agent is added to the lead-zinc sulfide ore containing extremely low copper sulfide, clean water is added to adjust the slurry concentration to 75%, and the ore is ground to -0.074mm, accounting for 70-75%, to obtain material a; Step 2, preparation of lead concentrate; Step 2.1, lead roughing: add sphalerite activity remover to material a and stir for 3 minutes, then add lead collector for flotation to obtain lead rough concentrate b and flotation tailings c; Step 2.2, primary lead concentration: the lead rough concentrate b is subjected to agitator grinding to strip and clean the ore surface, and a zinc inhibitor is added for primary concentration to obtain a primary lead concentrate d and a primary concentrated tailings e. The primary concentrated tailings e are returned to step 2.1 for lead rough concentration; Step 2.3, secondary lead concentration: adding zinc inhibitor to the primary lead concentrate d for secondary concentration to obtain secondary lead concentrate f and secondary concentrated tailings g, and the secondary concentrated tailings g are returned to step 2.2 for primary lead concentration; Step 2.4, tertiary lead concentration: zinc inhibitor is added to the secondary lead concentrate f for tertiary concentration to obtain final lead concentrate h and tertiary concentrated tailings i, and the tertiary concentrated tailings i are returned to step 2.3 for primary lead concentration; Step 2.5, primary lead scavenging: add lead collector to flotation tailings c for primary scavenging to obtain primary scavenging concentrate j and primary scavenging tailings k. The primary scavenging concentrate j is returned to step 2.1 for lead roughing; Step 2.6, secondary lead scavenging: add lead collector to the primary scavenging tailings k for secondary scavenging to obtain secondary scavenging concentrate l and secondary scavenging tailings m, and the secondary scavenging concentrate l returns to step 2.5 for primary lead scavenging; Step 3, zinc concentrate preparation; Step 3.1, zinc roughing: adding an activator, a zinc collector and a frother to the secondary scavenging tailings m to perform zinc roughing to obtain zinc rough concentrate n and zinc roughing tailings o; Step 3.2, primary zinc concentration: blank concentration is performed on the zinc rough concentration ore n to obtain primary zinc concentrate p and primary zinc concentration tailings q, and the primary zinc concentration tailings q are returned to step 3.1 for zinc rough concentration; Step 3.3, secondary zinc concentration: the primary zinc concentrate p is subjected to blank concentration to obtain secondary zinc concentrate r and secondary zinc concentration tailings s, and the secondary zinc concentration tailings s are returned to step 3.2 for primary zinc concentration; Step 3.4, tertiary zinc concentration: the secondary zinc concentrate r is subjected to blank concentration to obtain the final zinc concentrate t and tertiary zinc concentration tailings u, and the tertiary zinc concentration tailings u are returned to step 3.3 for secondary zinc concentration; Step 3.5, primary zinc scavenging: adding an activator, a zinc collector and a frother to the zinc rougher tailings o for primary scavenging to obtain primary zinc scavenging concentrate v and primary zinc scavenging tailings w, and the primary zinc scavenging tailings w are returned to step 3.1 for zinc roughing; Step 3.6, secondary zinc scavenging: add activator, zinc collector and frother to the primary zinc scavenging concentrate v for secondary scavenging to obtain secondary zinc scavenging concentrate x and final tailings y. The secondary zinc scavenging concentrate x returns to step 3.5 for primary zinc scavenging.

[0007] Furthermore, in the slurry pretreatment of step 1, the heavy metal ion shielding agent is ZP, the addition amount is 500g / t, and the ZP is composed of sodium sulfide: sodium carbonate: citric acid = 1:5:5.

[0008] Furthermore, in the step 2.1 lead roughing, the sphalerite active remover is sodium dimethyldithiocarbamate: sodium pyrophosphate: zinc sulfate = 1:3:6, the addition amount is 1000g / t, and the stirring time is 3 to 5min; the lead collector is ethyl sodium black medicine, the addition amount is 50g / t, the stirring time is 1 to 2min, and after the addition and stirring of the reagents are completed, the lead roughing time is 3 to 5min.

[0009] Furthermore, in the primary lead concentration, step 2.3 secondary lead concentration and step 2.4 tertiary lead concentration, the zinc inhibitor is zinc sulfate: sodium sulfite = 4:1, the addition amount is 200g / t, the stirring time is 3-5min, and the lead concentration time of each level is 3min.

[0010] Furthermore, in step 2.5, the lead primary scavenging and step 2.6, the lead secondary scavenging, the lead collector is ethyl xanthate: isopropyl xanthate = 2:1, the addition amount is 20g / t, the stirring time is 1-2min, and the lead scavenging time at each level is 3min.

[0011] Furthermore, in the preparation of zinc concentrate in step 3, the activator is copper sulfate: ammonium chloride = 5:1; the collector is butyl xanthate: isobutyl thiocarbamate = 1:1; and the foaming agent is methyl isobutyl carbinol: propylene glycol butyl ether = 1:1.

[0012] Furthermore, in the zinc coarse selection of step 3.1, the amount of activator added is 200 g / t; the stirring time is 3 min; the amount of collector added is 100 g / t; the stirring time is 1 to 2 min; the amount of foaming agent added is 20 g / t; and the stirring time is 1 min.

[0013] Furthermore, in step 3.3, in the primary zinc scavenging, the amount of activator added is 100 g / t; the stirring time is 3 min; the amount of zinc collector added is 50 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; the stirring time is 1 min; in step 3.4, in the secondary zinc scavenging, the amount of activator added is 50 g / t; the stirring time is 3 min; the amount of zinc collector added is 30 g / t; the stirring time is 1 min; the amount of frother added is 10 g / t; the stirring time is 1 min; and the scavenging time for each level of zinc is 2 min.

[0014] Compared with the existing technology, the present invention has the following beneficial effects: The process of the invention is simple, easy to operate, energy-saving, environmentally friendly and has good applicability. The ore dressing method processes lead-zinc sulfide ores with a copper content of no more than 0.05%, a lead concentrate with a lead content of more than 60%, a zinc content of no more than 6%, a lead recovery rate of more than 90%, and a zinc concentrate with a zinc content of more than 42% and a zinc recovery rate of more than 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the embodiments, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention.

[0017] The ore dressing method for separating lead and zinc from a lead-zinc sulfide ore containing extremely low copper sulfide of the present invention comprises the steps of pretreatment, lead concentrate preparation, and zinc concentrate preparation, and specifically comprises: A. Pretreatment: Grind the lead-zinc sulfide ore containing extremely low copper sulfide to be treated to -0.074mm, accounting for 70-75%, add heavy metal ion shielding agent, add clean water to adjust the pulp concentration to 70-80% to obtain material a; B. Preparation of lead concentrate: 1) Add sphalerite activity remover to material a and stir for 2-4 minutes, then add lead collector for flotation to obtain lead rough concentrate b and flotation tailings c; 2) The lead rough concentrate b is subjected to three-stage concentration to obtain the final lead concentrate h and concentrated tailings, and the concentrated tailings are returned to the previous step for circulation; 3) The flotation tailings c are subjected to secondary scavenging to obtain secondary scavenging tailings m and scavenging concentrates, and the scavenging concentrates are returned to the previous step for circulation; C. Preparation of zinc concentrate: 1) Adding an activator, a zinc collector and a frother to the secondary scavenging tailings m for flotation to obtain zinc rough concentrate n and zinc rougher tailings o; 2) The zinc rough concentrate n is subjected to three-stage concentration to obtain the final zinc concentrate t and the concentrated tailings, and the concentrated tailings are returned to the previous step for circulation; 3) The zinc rougher tailings o are subjected to secondary scavenging to obtain scavenged concentrate and final tailings y, and the scavenged concentrate is returned to the previous step for circulation.

[0018] The tertiary concentration described in step B 2) is to grind the lead rough concentrate b through a stirred mill to peel and clean the ore surface, add a zinc inhibitor to carry out primary concentration, and obtain a primary lead concentrate d and a primary concentrated tailings e, and the primary concentrated tailings e are returned to the lead rough concentration step; add a zinc inhibitor to the primary lead concentrate d to carry out secondary concentration, and obtain a secondary lead concentrate f and a secondary concentrated tailings g, and the secondary concentrated tailings g are returned to the lead primary concentration step; add a zinc inhibitor to the secondary lead concentrate f to carry out tertiary concentration, and obtain a final lead concentrate h and a tertiary concentrated tailings i, and the tertiary concentrated tailings i are returned to the lead primary concentration step.

[0019] B. The secondary scavenging described in step 3) is to add a lead collector to the flotation tailings c for primary scavenging to obtain a primary scavenging concentrate j and a primary scavenging tailings k, and the primary scavenging concentrate j is returned to the lead roughing step; and a lead collector is added to the primary scavenging tailings k for secondary scavenging to obtain a secondary scavenging concentrate l and a secondary scavenging tailings m, and the secondary scavenging concentrate l is returned to the lead primary scavenging step.

[0020] The tertiary concentration described in step C2) is to perform blank concentration on the zinc roughing ore n to obtain primary zinc concentrate p and primary zinc concentrated tailings q, and the primary zinc concentrated tailings q are returned to the zinc roughing step; the primary zinc concentrate p is subjected to blank concentration to obtain secondary zinc concentrate r and secondary zinc concentrated tailings s, and the secondary zinc concentrated tailings s are returned to the zinc primary concentration step; the secondary zinc concentrate r is subjected to blank concentration to obtain final zinc concentrate t and tertiary zinc concentrated tailings u, and the tertiary zinc concentrated tailings u are returned to the zinc secondary concentration step.

[0021] The secondary scavenging described in step C3) is to add an activator, a zinc collector and a frother to the zinc rougher tailings o to carry out primary zinc scavenging to obtain a primary zinc scavenging concentrate v and a primary zinc scavenging tailings w, and the primary zinc scavenging tailings w are returned to the zinc rougher step; and to add an activator, a zinc collector and a frother to the primary zinc scavenging concentrate v to carry out secondary zinc scavenging to obtain a secondary zinc scavenging concentrate x and a final tailings y, and the secondary zinc scavenging concentrate x is returned to the primary zinc scavenging step.

[0022] The heavy metal ion shielding agent is ZP, which is composed of sodium sulfide, sodium carbonate and citric acid. The mass ratio of sodium sulfide, sodium carbonate and citric acid is (0.5-1.5): (4-6): (4-6).

[0023] The sphalerite active remover is composed of sodium dimethyldithiocarbamate, sodium pyrophosphate and zinc sulfate in a mass ratio of (0.5-1.5):(2-4):(5-7).

[0024] The zinc inhibitor is composed of zinc sulfate and sodium sulfite in a mass ratio of (3-5):1.

[0025] The lead collector is composed of ethyl xanthate and isopropyl xanthate in a mass ratio of (1-3):1.

[0026] C. The activator described 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 thiocarbamate in a mass ratio of 1:1; and the foaming agent is composed of methyl isobutyl carbinol and propylene glycol butyl ether in a mass ratio of 1:1.

[0027] The present invention is further described below with specific implementation cases: Example 1 This example uses a ore sample from Qinghai as the research object, and adopts a lead-zinc separation and beneficiation method for lead-zinc sulfide ore containing extremely low copper sulfide. The specific steps are as follows: 1. Properties of the original ore A certain ore sample in Qinghai contains 0.048% copper, 1.45% lead and 2.64% zinc. The main useful minerals are chalcopyrite, galena and sphalerite.

[0028] 2. Ore dressing method Step 1, pretreatment: add 500g / t of sodium sulfide: sodium carbonate: citric acid = 1:5:5 to the ore, add clean water to adjust the slurry concentration to 75%, grind the ore to -0.074mm, accounting for 70%, to obtain material a; Step 2, preparation of lead concentrate; Step 2.1, lead roughing: add 1000 g / t of a combination reagent of sodium dimethyldithiocarbamate: sodium pyrophosphate: zinc sulfate = 1:3:6 to material a, stir for 3 minutes, add 50 g / t of lead collector ethyl sodium black medicine, stir for 1 to 2 minutes, after the reagent addition and stirring are completed, the lead roughing time is 3 minutes, and the lead rough concentrate b and flotation tailings c are obtained; Step 2.2, primary lead concentration: the lead rough concentrate b is subjected to agitator grinding to strip and clean the ore surface, and 200 g / t of zinc inhibitor with a ratio of zinc sulfate: sodium sulfite = 4:1 is added, and the stirring time is 3 min, followed by primary concentration for 3 min to obtain primary lead concentrate d and primary concentrated tailings e, and the primary concentrated tailings e are returned to step 2.1 for lead roughing; Step 2.3, secondary lead concentration: add 200 g / t of zinc inhibitor in a ratio of zinc sulfate: sodium sulfite = 4:1 to the primary lead concentrate d, stir for 3 min, and then perform secondary concentration for 3 min to obtain secondary lead concentrate f and secondary concentrated tailings g. The secondary concentrated tailings g are returned to step 2.2 for primary lead concentration; Step 2.4, tertiary lead concentration: add 200 g / t of zinc inhibitor in a ratio of zinc sulfate: sodium sulfite = 4:1 to the secondary lead concentrate f, stir for 3 min, and then perform tertiary concentration for 3 min to obtain the final lead concentrate h and tertiary concentrated tailings i. The tertiary concentrated tailings i are returned to step 2.3 for primary lead concentration; Step 2.5, primary lead scavenging: add 20 g / t of lead collector in the ratio of ethyl xanthate: isopropyl xanthate = 2:1 to the flotation tailings c, stir for 1 min, and perform primary scavenging to obtain primary scavenging concentrate j and primary scavenging tailings k. The primary scavenging concentrate j is returned to step 2.1 for lead roughing; Step 2.6, secondary lead scavenging: add 20 g / t of lead collector in the ratio of ethyl xanthate: isopropyl xanthate = 2:1 to the primary scavenging tailings k, stir for 1 min, and perform secondary scavenging to obtain secondary scavenging concentrate l and secondary scavenging tailings m. The secondary scavenging concentrate l is returned to step 2.5 for primary lead scavenging; Step 3, zinc concentrate preparation; Step 3.1, zinc roughing: add 200 g / t of activator in the ratio of copper sulfate: ammonium chloride = 5:1 to the secondary scavenging tailing m; stir for 3 min; then add 100 g / t of zinc collector in the ratio of butyl xanthate: isobutyl thiocarbamate = 1:1; stir for 1 min, continue to add 20 g / t of frother in the ratio of methyl isobutyl carbinol: propylene glycol butyl ether = 1:1; stir for 1 min, and finally perform zinc roughing for 3 min to obtain zinc rough concentrate n and zinc roughing tailing o; Step 3.2, primary zinc concentration: the zinc rough concentrate ore n is blank concentrated for 3 minutes to obtain primary zinc concentrate p and primary zinc concentrate tailings q, and the primary zinc concentrate tailings q are returned to step 3.1 for zinc rough concentration; Step 3.3, secondary zinc concentration: the primary zinc concentrate p is blank concentrated for 3 minutes to obtain secondary zinc concentrate r and secondary zinc concentration tailings s, and the secondary zinc concentration tailings s are returned to step 3.2 for primary zinc concentration; Step 3.4, tertiary zinc concentration: the secondary zinc concentrate r is blank concentrated for 3 minutes to obtain the final zinc concentrate t and tertiary zinc concentration tailings u, and the tertiary zinc concentration tailings u are returned to step 3.3 for secondary zinc concentration; Step 3.5, primary zinc scavenging: add 100 g / t of activator in the ratio of copper sulfate: ammonium chloride = 5:1 to the zinc roughing tailing o; stir for 3 min; then add 50 g / t of zinc collector in the ratio of butyl xanthate: isobutyl thiocarbamate = 1:1, stir for 1 min, continue to add 10 g / t of frother in the ratio of methyl isobutyl carbinol: propylene glycol butyl ether = 1:1; stir for 1 min, perform primary zinc scavenging for 2 min, obtain primary zinc scavenging concentrate v and primary zinc scavenging tailing w, and the primary zinc scavenging tailing w returns to step 3.1 for zinc roughing; Step 3.6, secondary zinc scavenging: add 50 g / t of activator in the ratio of 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 in the ratio of butyl xanthate: isobutyl thiocarbamate = 1:1; stir for 1 min, continue to add 10 g / t of frother in the ratio of methyl isobutyl carbinol: propylene glycol butyl ether = 1:1; stir for 1 min, perform secondary zinc scavenging for 2 min, obtain secondary zinc scavenging concentrate x and final tailings y, and return the secondary zinc scavenging concentrate x to step 3.5 for primary zinc scavenging; By using this process to treat the ore, we can obtain lead concentrate with a lead grade of 60.12%, a zinc grade of 5.89%, and a lead recovery rate of 94.72%; and zinc concentrate with a zinc grade of 44.32% and a zinc recovery rate of 90.56%, which are good indicators.

[0029] Example 2 This example uses a certain ore sample of Tengchong as the research object, and adopts a lead-zinc separation and beneficiation method for lead-zinc sulfide ore containing extremely low copper sulfide. The specific steps are as follows: 1. Properties of the original ore A certain ore sample in Tengchong contains 0.056% copper, 2.73% lead and 2.95% zinc. The main useful minerals are chalcopyrite, galena and sphalerite.

[0030] 2. Ore dressing method Step 1, pretreatment: add 500g / t of sodium sulfide: sodium carbonate: citric acid = 1:5:5 to the ore, add clean water to adjust the slurry concentration to 80%, grind the ore to -0.074mm accounting for 70% to obtain material a; Step 2, preparation of lead concentrate; Step 2.1, lead roughing: add 600 g / t of a combination reagent of sodium dimethyldithiocarbamate: sodium pyrophosphate: zinc sulfate = 1:3:6 to material a, stir for 3 minutes, add 40 g / t of lead collector ethyl sodium black medicine, stir for 2 minutes, after the reagent addition and stirring are completed, the lead roughing time is 4 minutes, and the lead rough concentrate b and flotation tailings c are obtained; Step 2.2, primary lead concentration: the lead rough concentrate b is subjected to agitator grinding to strip and clean the ore surface, and 200 g / t of zinc inhibitor with a ratio of zinc sulfate: sodium sulfite = 4:1 is added, and the stirring time is 3 min, followed by primary concentration for 3 min to obtain primary lead concentrate d and primary concentrated tailings e, and the primary concentrated tailings e are returned to step 2.1 for lead roughing; Step 2.3, secondary lead concentration: add 100 g / t of zinc inhibitor in a ratio of zinc sulfate: sodium sulfite = 4:1 to the primary lead concentrate d, stir for 3 min, and then perform secondary concentration for 3 min to obtain secondary lead concentrate f and secondary concentrated tailings g. The secondary concentrated tailings g are returned to step 2.2 for primary lead concentration; Step 2.4, tertiary lead concentration: add 100 g / t of zinc inhibitor in a ratio of zinc sulfate: sodium sulfite = 4:1 to the secondary lead concentrate f, stir for 3 min, and then perform tertiary concentration for 3 min to obtain the final lead concentrate h and tertiary concentrated tailings i. The tertiary concentrated tailings i are returned to step 2.3 for primary lead concentration; Step 2.5, primary lead scavenging: add 20 g / t of lead collector in the ratio of ethyl xanthate: isopropyl xanthate = 2:1 to the flotation tailings c, stir for 1 min, and perform primary scavenging to obtain primary scavenging concentrate j and primary scavenging tailings k. The primary scavenging concentrate j is returned to step 2.1 for lead roughing; Step 2.6, secondary lead scavenging: add 20 g / t of lead collector in the ratio of ethyl xanthate: isopropyl xanthate = 2:1 to the primary scavenging tailing k, stir for 1 min, and obtain secondary scavenging concentrate l and secondary scavenging tailing m through secondary scavenging. The secondary scavenging concentrate l returns to step 2.5 for primary lead scavenging; Step 3, zinc concentrate preparation; Step 3.1, zinc roughing: add 250 g / t of activator in the ratio of copper sulfate: ammonium chloride = 5:1 to the secondary scavenging tailing m; stir for 3 min; then add 60 g / t of zinc collector in the ratio of butyl xanthate: isobutyl thiocarbamate = 1:1; stir for 1 min, continue to add 20 g / t of frother in the ratio of methyl isobutyl carbinol: propylene glycol butyl ether = 1:1; stir for 1 min, and finally perform zinc roughing for 3 min to obtain zinc rough concentrate n and zinc roughing tailing o; Step 3.2, primary zinc concentration: the zinc rough concentrate ore n is blank concentrated for 3 minutes to obtain primary zinc concentrate p and primary zinc concentrate tailings q, and the primary zinc concentrate tailings q are returned to step 3.1 for zinc rough concentration; Step 3.3, secondary zinc concentration: the primary zinc concentrate p is blank concentrated for 3 minutes to obtain secondary zinc concentrate r and secondary zinc concentration tailings s, and the secondary zinc concentration tailings s are returned to step 3.2 for primary zinc concentration; Step 3.4, tertiary zinc concentration: the secondary zinc concentrate r is blank concentrated for 3 minutes to obtain the final zinc concentrate t and tertiary zinc concentration tailings u, and the tertiary zinc concentration tailings u are returned to step 3.3 for secondary zinc concentration; Step 3.5, primary zinc scavenging: add 80 g / t of activator in the ratio of copper sulfate: ammonium chloride = 5:1 to the zinc roughing tailing o; stir for 3 min; then add 30 g / t of zinc collector in the ratio of butyl xanthate: isobutyl thiocarbamate = 1:1, stir for 1 min, continue to add 10 g / t of frother in the ratio of methyl isobutyl carbinol: propylene glycol butyl ether = 1:1; stir for 1 min, perform primary zinc scavenging for 2 min, obtain primary zinc scavenging concentrate v and primary zinc scavenging tailing w, and return the primary zinc scavenging tailing w to step 3.1 for zinc roughing; Step 3.6, secondary zinc scavenging: add 40 g / t of activator in the 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 in the ratio of butyl xanthate: isobutyl thiocarbamate = 1:1; stir for 1 min, continue to add 10 g / t of frother in the ratio of methyl isobutyl carbinol: propylene glycol butyl ether = 1:1; stir for 1 min, perform secondary zinc scavenging for 2 min, obtain secondary zinc scavenging concentrate x and final tailings y, and return the secondary zinc scavenging concentrate x to step 3.5 for primary zinc scavenging; By using this process to treat the ore, we can obtain lead concentrate with a lead grade of 68.97%, a zinc grade of 5.40%, and a lead recovery rate of 91.66%; zinc concentrate with a zinc grade of 51.03% and a zinc recovery rate of 90.42%, which are good indicators.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A beneficiation method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide, characterized in that: The method for separating lead and zinc from a lead-zinc sulfide ore containing extremely low copper sulfide comprises pretreatment, lead concentrate preparation, and zinc concentrate preparation steps, specifically comprising: A. Pretreatment: Grind the lead-zinc sulfide ore containing extremely low copper sulfide to be treated to -0.074mm, accounting for 70-75%, add heavy metal ion shielding agent, add clean water to adjust the pulp concentration to 70-80% to obtain material a; B. Preparation of lead concentrate: 1) Add sphalerite activity remover to material a and stir for 2-4 minutes, then add lead collector for flotation to obtain lead rough concentrate b and flotation tailings c; 2) The lead rough concentrate b is subjected to three-stage concentration to obtain the final lead concentrate h and concentrated tailings, and the concentrated tailings are returned to the previous step for circulation; 3) The flotation tailings c are subjected to secondary scavenging to obtain secondary scavenging tailings m and scavenging concentrates, and the scavenging concentrates are returned to the previous step for circulation; C. Preparation of zinc concentrate: 1) Adding an activator, a zinc collector and a frother to the secondary scavenging tailings m for flotation to obtain zinc rough concentrate n and zinc rougher tailings o; 2) The zinc rough concentrate n is subjected to three-stage concentration to obtain the final zinc concentrate t and the concentrated tailings, and the concentrated tailings are returned to the previous step for circulation; 3) The zinc rougher tailings o are subjected to secondary scavenging to obtain scavenged concentrate and final tailings y, and the scavenged concentrate is returned to the previous step for circulation.

2. The method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide according to claim 1, characterized in that: The tertiary concentration described in step B 2) is to grind the lead rough concentrate b through a stirred mill to peel and clean the ore surface, add a zinc inhibitor to carry out primary concentration, and obtain a primary lead concentrate d and a primary concentrated tailings e, and the primary concentrated tailings e are returned to the lead rough concentration step; add a zinc inhibitor to the primary lead concentrate d to carry out secondary concentration, and obtain a secondary lead concentrate f and a secondary concentrated tailings g, and the secondary concentrated tailings g are returned to the lead primary concentration step; add a zinc inhibitor to the secondary lead concentrate f to carry out tertiary concentration, and obtain a final lead concentrate h and a tertiary concentrated tailings i, and the tertiary concentrated tailings i are returned to the lead primary concentration step.

3. The beneficiation method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide according to claim 1, characterized in that: B. The secondary scavenging described in step 3) is to add a lead collector to the flotation tailings c for primary scavenging to obtain a primary scavenging concentrate j and a primary scavenging tailings k, and the primary scavenging concentrate j is returned to the lead roughing step; and a lead collector is added to the primary scavenging tailings k for secondary scavenging to obtain a secondary scavenging concentrate l and a secondary scavenging tailings m, and the secondary scavenging concentrate l is returned to the lead primary scavenging step.

4. The method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide according to claim 1, characterized in that: The tertiary concentration described in step C2) is to perform blank concentration on the zinc roughing ore n to obtain primary zinc concentrate p and primary zinc concentrated tailings q, and the primary zinc concentrated tailings q are returned to the zinc roughing step; the primary zinc concentrate p is subjected to blank concentration to obtain secondary zinc concentrate r and secondary zinc concentrated tailings s, and the secondary zinc concentrated tailings s are returned to the zinc primary concentration step; the secondary zinc concentrate r is subjected to blank concentration to obtain final zinc concentrate t and tertiary zinc concentrated tailings u, and the tertiary zinc concentrated tailings u are returned to the zinc secondary concentration step.

5. The method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide according to claim 1, characterized in that: The secondary scavenging described in step C3) is to add an activator, a zinc collector and a frother to the zinc rougher tailings o to carry out primary zinc scavenging to obtain a primary zinc scavenging concentrate v and a primary zinc scavenging tailings w, and the primary zinc scavenging tailings w are returned to the zinc rougher step; and to add an activator, a zinc collector and a frother to the primary zinc scavenging concentrate v to carry out secondary zinc scavenging to obtain a secondary zinc scavenging concentrate x and a final tailings y, and the secondary zinc scavenging concentrate x is returned to the primary zinc scavenging step.

6. The method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide according to claim 1, characterized in that: The heavy metal ion shielding agent is ZP, which is composed of sodium sulfide, sodium carbonate and citric acid. The mass ratio of sodium sulfide, sodium carbonate and citric acid is (0.5-1.5): (4-6): (4-6).

7. The method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide according to claim 1, characterized in that: The sphalerite active remover is composed of sodium dimethyldithiocarbamate, sodium pyrophosphate and zinc sulfate in a mass ratio of (0.5-1.5):(2-4):(5-7).

8. The method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide according to claim 2, characterized in that: The zinc inhibitor is composed of zinc sulfate and sodium sulfite in a mass ratio of (3-5):

1.

9. The method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide according to claim 3, characterized in that: The lead collector is composed of ethyl xanthate and isopropyl xanthate in a mass ratio of (1-3):

1.

10. The method for separating lead and zinc from lead-zinc sulfide ore containing extremely low copper sulfide according to claim 1, characterized in that: C. The activator described 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 thiocarbamate in a mass ratio of 1:1; and the foaming agent is composed of methyl isobutyl carbinol and propylene glycol butyl ether in a mass ratio of 1:1.

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