A flotation separation method for copper-sulfur polymetallic ore

Abstract

The present invention relates to the field of flotation technology, and in particular to a flotation separation method for copper-sulfur polymetallic ore. The flotation separation method for copper-sulfur polymetallic ore of the present invention comprises the following steps: S1, grinding the raw ore to obtain a ground material having chalcopyrite 112, 204, and 312 crystal face exposure ratios of 55% to 65%, 5% to 18%, and 3% to 10%, respectively, and pyrite 100 crystal face exposure ratio of 60% to 80%; S2, mixing the ground material, a collector A, an inhibitor B, and a frother and performing a roughing operation to obtain a roughing concentrate and a roughing tailing; S3, mixing the roughing concentrate and the collector A and performing multiple rounds of concentration to obtain a copper concentrate; S4, performing cascade enhanced flotation on the roughing tailing to obtain a sulfur-containing tailing; the collector A comprises the inhibitor B, sodium cyanamide, sodium dicyanamide, sodium polymelamide, and sodium polysulfide; and the flotation method improves the recovery rate of copper and sulfur.

Description

Technical Field

[0001] The present invention relates to the field of flotation technology, in particular to a flotation separation method for copper-sulfur polymetallic ore. Background Art

[0002] Copper and sulfur are important metal resources in modern industry and have important applications in the chemical industry, industrial manufacturing, fireproof materials and aerospace. Chalcopyrite has attracted widespread attention because it contains three metal elements: iron, copper and sulfur. Chalcopyrite is mainly produced in polymetallic sulfide deposits and coexists with sulfide minerals such as pyrite, molybdenite, and arsenopyrite. During the flotation separation process, due to the similarity in the chemical properties of chalcopyrite and pyrite, and the fact that chalcopyrite and pyrite are extremely easy to oxidize and have similar floatability, chalcopyrite concentrate is usually obtained by preferential flotation. However, conventional collectors and inhibitors cannot effectively recover copper and inhibit pyrite minerals, resulting in the loss of copper resources.

[0003] In view of this, this invention is proposed. Summary of the Invention

[0004] The object of the present invention is to provide a flotation separation method for copper-sulfur polymetallic ore, thereby improving the recovery rate of copper and sulfur.

[0005] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0006] The present invention provides a flotation separation method for copper-sulfur polymetallic ore, comprising the following steps:

[0007] S1. Grinding the raw ore to obtain a ground material; in the ground material, the 112 crystal plane exposure ratio of chalcopyrite is 55% to 65%, the 204 crystal plane exposure ratio is 5% to 18%, the 312 crystal plane exposure ratio is 3% to 10%, and the 100 crystal plane exposure ratio of pyrite is 60% to 80%;

[0008] S2, after the ground material is slurried and pH adjusted in sequence, collector A, inhibitor B and foaming agent are added to perform a roughing operation to obtain a roughing concentrate and a roughing tailing;

[0009] S3, the rougher concentrate and collector A are mixed and subjected to multiple concentrations to obtain a copper concentrate;

[0010] S4, performing cascade enhanced flotation on the roughing tailings to obtain sulfur-containing tailings;

[0011] The collector A comprises

[0012] The inhibitor B includes sodium cyanamide, sodium dicyanamide, sodium polymelamide and sodium polysulfide.

[0013] Furthermore, in step S1, the average grade of copper in the raw ore is 0.2% to 0.6%, and the average grade of sulfur is 1% to 2%.

[0014] Furthermore, in step S1, the grinding process includes sequentially performing a first-stage grinding process and a second-stage grinding process, wherein the first-stage grinding process includes semi-autogenous grinding, and the second-stage grinding process includes ball milling and / or stage milling.

[0015] Furthermore, in step S2 and step S4, the mass ratio of the sodium cyanamide, the sodium dicyanamide, the sodium polymelamine and the sodium polysulfide is (1-5): (10-17): (2-7): (1-2).

[0016] Furthermore, in step S2, during the primary roughing process, the amount of the collector A added is 1000-2000 g / t, and the amount of the inhibitor B added is 50-1500 g / t.

[0017] Furthermore, in step S3, the multiple selections include three selections or four selections.

[0018] Furthermore, in step S3, in the first stage and second stage of the multiple cleaning processes, the amount of the collector A added is independently 50 to 200 g / t.

[0019] Furthermore, in step S4, the step-enhanced flotation comprises:

[0020] The rougher tailings are subjected to three open-circuit roughing operations to obtain an open-circuit rougher concentrate;

[0021] The open-circuit roughing concentrate is subjected to flotation to obtain the sulfur-containing tailings; the flotation includes primary roughing, secondary cleaning and tertiary scavenging.

[0022] Furthermore, in step S4, the three-time open-circuit roughing includes: adding 10-80 g / t of the collector A to perform three-time open-circuit roughing.

[0023] Furthermore, in step S4, the first roughing includes: adding 10-35 g / t of activator and 50-150 g / t of butyl xanthate for a first roughing; the third scavenging includes: adding 10-50 g / t of butyl xanthate for three scavengings.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The flotation separation method of the copper-sulfur polymetallic ore of the present invention realizes the differential flotation of chalcopyrite and pyrite with similar floatability based on the difference in the responsiveness of different crystal faces of chalcopyrite to a collector and the selective unsaturated coordination of the inhibitor to the crystal face properties of chalcopyrite and pyrite, solves the problem of separation of chalcopyrite and pyrite under low alkalinity conditions, and improves the recovery rates of copper and sulfur, with the copper recovery rate reaching over 89%. DETAILED DESCRIPTION

[0026] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work premise belong to the scope of protection of the present invention. Those who do not specify specific conditions in the embodiments are carried out according to normal conditions or the conditions recommended by the manufacturer. Those whose reagents or instruments are not specified by the manufacturer are conventional products that can be purchased commercially.

[0027] In some embodiments of the present invention, a flotation separation method for copper-sulfur polymetallic ore is provided, comprising the following steps:

[0028] S1. Grinding the raw ore to obtain a ground material; in the ground material, the exposure ratio of the 112 crystal plane of chalcopyrite is 55% to 65%, the exposure ratio of the 204 crystal plane is 5% to 18%, the exposure ratio of the 312 crystal plane is 3% to 10%, and the exposure ratio of the 100 crystal plane of pyrite is 60% to 80%;

[0029] S2, after the ground material is slurried and pH adjusted in sequence, collector A, inhibitor B and foaming agent are added to carry out a roughing process to obtain roughing concentrate and roughing tailings;

[0030] S3, the rougher concentrate is mixed with collector A and subjected to multiple rounds of cleaning to obtain copper concentrate;

[0031] S4, the roughing tailings are subjected to cascade enhanced flotation to obtain sulfur-containing tailings;

[0032] Collector A includes

[0033] Inhibitor A includes sodium cyanamide (CAS: 17292-62-5), sodium dicyanamide (CAS: 1934-75-4), sodium polymelamine (molecular weight of 1000-1500) and sodium polysulfide.

[0034] The flotation separation method of the copper-sulfur polymetallic ore of the present invention is a method for improving the flotation efficiency of copper-sulfur based on crystal plane differences.

[0035] According to the mode of action of different crystal faces of chalcopyrite and pyrite on the unsaturated coordination of the collector and the inhibitor, the present invention realizes the low-alkalinity recovery of easily floatable chalcopyrite and pyrite, eliminates the need to use a large amount of lime to inhibit pyrite, reduces the copper content in the sulfur-containing tailings and the amount of lime used, and achieves a copper recovery rate of over 89%.

[0036] For chalcopyrite, the most sparse crystal face is the 112 crystal face, followed by the 204 crystal face; the CN group in collector A can adsorb on the 112 crystal face of chalcopyrite; while the inhibitory ability of inhibitor B cannot replace the adsorption of the CN group in collector A on the 112 crystal face of chalcopyrite. This is mainly because the 4-coordinated iron on the surface of chalcopyrite is replaced by the CN group in collector A to become 6-coordinated iron under high-spin conditions. At this time, the iron ions in chalcopyrite are in a saturated state, which weakens or reduces the mutual coordination between inhibitor B and chalcopyrite, thereby increasing the floatability of chalcopyrite.

[0037] The 112-faced atoms of chalcopyrite have a large number of broken bonds, and the Cu ions and Fe ions change from 4-coordination to 3-coordination. Both are in a ligand-deficient state, are more active, and are easily strongly adsorbed by collector A. The iron in pyrite is a regular octahedron with a 6-coordinate structure, and the iron ions are in a low-spin state, which is more easily oxidized under the action of collector A, causing the 6-coordinated iron ions in pyrite to change from a low-spin state to a high-spin state, and the iron becomes highly oxidized iron, thereby achieving inhibition of pyrite.

[0038] During the multiple roughing processes, collector A is added to the portion of chalcopyrite that has not been completely dissociated. The CN group in collector A increases the contact opportunity with the 112 crystal face of chalcopyrite. On the other hand, the change in the ball distribution method of the semi-autogenous grinding equipment increases the exposure ratio of the 112 crystal face of chalcopyrite and the 100 crystal face of pyrite. Under the action of inhibitor B, pyrite is suppressed, and the final high-quality copper concentrate is obtained. During the multiple roughing processes, collector A is more likely to contact chalcopyrite, and the addition of inhibitor B as an auxiliary collector can achieve comprehensive recovery of difficult-to-float copper minerals.

[0039] In some embodiments of the present invention, in step S1, the raw ore includes chalcopyrite and pyrite.

[0040] In some embodiments of the present invention, in step S1, the average copper grade of the raw ore is 0.2% to 0.6%, and the average sulfur grade is 1% to 2%; preferably, the average iron grade of the raw ore is 1.5% to 2.5%; more preferably, the average copper grade of the raw ore is 0.35% to 0.45%, the average sulfur grade is 1.55% to 1.65%, and the average iron grade is 1.95% to 2.05%.

[0041] In some embodiments of the present invention, in step S1, the grinding treatment includes sequentially performing a first-stage grinding treatment and a second-stage grinding treatment, the first-stage grinding treatment includes semi-autogenous grinding, and the second-stage grinding treatment includes ball milling and / or segment milling; preferably, the time of the first-stage grinding treatment is 0.1 to 0.2 h, and the time of the second-stage grinding treatment is 0.15 to 0.3 h.

[0042] In some embodiments of the present invention, in step S1, in the ground material, the mass of solid particles with a particle size of less than 0.074 mm accounts for 60% to 70% of the mass of the total solid particles.

[0043] The exposure ratio of the crystal plane is determined based on the XRD test data using the ratio of the normalized peak intensities of the characteristic peaks representing each crystal plane.

[0044] In some embodiments of the present invention, in step S1, typically but not limitatively, for example, in the ground material, the exposure ratio of the 112 crystal plane of chalcopyrite may be 55%, 58%, 60%, 62%, 65%, or a range consisting of any two thereof; the exposure ratio of the 204 crystal plane of chalcopyrite may be 5%, 8%, 10%, 13%, 15%, 18%, or a range consisting of any two thereof; the exposure ratio of the 312 crystal plane of chalcopyrite may be 3%, 5%, 7%, 10%, or a range consisting of any two thereof; and the exposure ratio of the 100 crystal plane of pyrite may be 60%, 65%, 70%, 75%, 80%, or a range consisting of any two thereof.

[0045] In some embodiments of the present invention, slurry adjustment includes adding water to the ground material to adjust the slurry concentration to 30 wt % to 35 wt %.

[0046] In some embodiments of the present invention, in step S2, adjusting the pH comprises adding lime to adjust the pH of the slurry to 7-12.

[0047] In some embodiments of the present invention, in step S2, the mass ratio of sodium cyanamide, sodium dicyanamide, sodium polymelamine and sodium polysulfide is (1-5): (10-17): (2-7): (1-2); typically but not limitatively, for example, the mass ratio of sodium cyanamide, sodium dicyanamide, sodium polymelamine and sodium polysulfide can be 1:8:2:1, 2:8:3:1, 3:9:3:1, 4:10:5:1, 5:12:3:1, 3:15:4:1, 5:17:6:1, 4:16:6:2, 5:15:7:2 and the like.

[0048] In some embodiments of the present invention, in step S2, the foaming agent includes but is not limited to pine oil.

[0049] In some embodiments of the present invention, in step S2, during the primary roughing process, the amount of collector A added is 1000-2000 g / t; typically but not limitatively, for example, in step S2, during the primary roughing process, the amount of collector A added can be 1000 g / t, 1200 g / t, 1400 g / t, 1600 g / t, 1800 g / t, 2000 g / t or a range consisting of any two thereof.

[0050] In some embodiments of the present invention, in step S2, during the primary roughing process, the amount of inhibitor B added is 50 to 1500 g / t. Typically, but not limiting, for example, in step S2, during the primary roughing process, the amount of inhibitor B added may be 50 g / t, 200 g / t, 500 g / t, 700 g / t, 1000 g / t, 1200 g / t, 1500 g / t, or a range consisting of any two thereof.

[0051] In some embodiments of the present invention, in step S2, during the primary roughing process, the amount of the foaming agent added is 10 to 30 g / t; typically but not limitatively, for example, in step S2, during the primary roughing process, the amount of the foaming agent added can be 10 g / t, 15 g / t, 20 g / t, 25 g / t, 30 g / t, or a range consisting of any two thereof.

[0052] In some embodiments of the present invention, in step S3, the multiple selections include three selections or four selections.

[0053] In some embodiments of the present invention, in step S3, the amount of collector A added in the first stage and the second stage of multiple selections is independently 50-200 g / t; preferably, in step S3, the amount of collector A added in the first stage of multiple selections is 100-200 g / t; and the amount of collector A added in the second stage of multiple selections is 50-100 g / t.

[0054] In some embodiments of the present invention, in step S3, multiple selections are performed, including the following steps:

[0055] 100-200 g / t of collector A is added to the rougher concentrate for one-stage concentration to obtain concentrated ore I and concentrated middlings I; 50-100 g / t of collector A is added to the concentrated concentrate I for two-stage concentration to obtain concentrated ore II and concentrated middlings II; the concentrated concentrate II is subjected to three-stage concentration to obtain copper concentrate and concentrated middlings III; among them, the concentrated middlings II and concentrated middlings III are returned to the previous stage for re-selection.

[0056] In some embodiments of the present invention, in step S4, the step-enhanced flotation comprises:

[0057] The rougher tailings are subjected to three open-circuit roughing operations to obtain open-circuit rougher concentrate;

[0058] The open-circuit rougher concentrate is subjected to flotation to obtain sulfur-containing tailings; flotation includes primary roughing, secondary cleaning and tertiary scavenging.

[0059] In some embodiments of the present invention, in step S4, the three-time open-circuit roughing includes: adding 10-80 g / t of collector A for three-time open-circuit roughing; typically but not limitatively, for example, in step S4, the amount of collector A added during the three-time open-circuit roughing process can be 10 g / t, 20 g / t, 30 g / t, 40 g / t, 50 g / t, 60 g / t, 70 g / t, 80 g / t or a range value consisting of any two thereof.

[0060] In some embodiments of the present invention, in step S4, the first roughing includes: adding 10-35 g / t activator and 50-150 g / t butyl xanthate for a first roughing; the third scavenging includes: adding 10-50 g / t butyl xanthate for three scavengings.

[0061] In some embodiments of the present invention, in step S4, the step-enhanced flotation comprises the following steps:

[0062] Adding 70-80 g / t of collector A to the rougher tailings to carry out a first-stage open-circuit roughing to obtain open-circuit rougher concentrate I and open-circuit rougher tailings I; adding 50-60 g / t of collector A to the open-circuit rougher tailings I to carry out a second-stage open-circuit roughing to obtain open-circuit rougher concentrate II and open-circuit rougher tailings II; adding 10-30 g / t of collector A to the open-circuit rougher tailings II to carry out a third-stage open-circuit roughing to obtain open-circuit rougher concentrate III and open-circuit rougher tailings III; the open-circuit rougher concentrate I, the open-circuit rougher concentrate II and the open-circuit rougher concentrate III are mixed to obtain an open-circuit rougher concentrate;

[0063] Adding 10-35 g / t of activator and 50-150 g / t of butyl xanthate (collector) to the open-circuit rougher concentrate to perform a rougher separation to obtain rougher concentrate IV and rougher tailings IV;

[0064] The rougher concentrate IV is subjected to a first-stage concentration to obtain a concentrated concentrate V and a concentrated middling V; the concentrated concentrate V is subjected to a second-stage concentration to obtain a concentrated concentrate VI and a concentrated middling VI;

[0065] 10-50 g / t butyl xanthate is added to the concentrated ore VI for one-stage scavenging to obtain scavenged ore VII and scavenged tailings VII; 10-50 g / t butyl xanthate is added to the scavenged tailings VII for two-stage scavenging to obtain scavenged ore VIII and scavenged tailings VIII; 10-50 g / t butyl xanthate is added to the scavenged tailings VIII for three-stage scavenging to obtain scavenged ore IX and scavenged tailings IX, and the scavenged tailings IX are sulfur-containing tailings.

[0066] In some embodiments of the present invention, in step S4, the activator includes but is not limited to copper sulfate.

[0067] In the flotation separation method for copper-sulfur polymetallic ore of the present invention, the added amount of each reagent is the mass of the reagent added per ton of ore pulp.

[0068] Example 1

[0069] The flotation separation method of copper-sulfur polymetallic ore provided in this embodiment includes the following steps:

[0070] S1. The raw ore is a copper-sulfur polymetallic ore; the metal minerals include chalcopyrite and pyrite, and the gangue minerals include quartz and mica; the average grade of copper in the raw ore is 0.4%, the average grade of sulfur is 1.6%, and the average grade of iron is 2.0%;

[0071] The raw ore is semi-autogenously ground for 0.15 h, and then segment-milled or ball-milled for 0.2 h to obtain ground ore;

[0072] The particles with a size of less than 0.074 mm accounted for 65 wt% of the grinding material. In the grinding material, the exposure ratio of the 112 crystal plane of chalcopyrite was 57%, the exposure ratio of the 204 crystal plane was 8%, the exposure ratio of the 312 crystal plane was 5%, and the exposure ratio of the 100 crystal plane of pyrite was 63%.

[0073] S2. Water was added to the ground material to adjust the mass concentration of the slurry to 30 wt %, lime was added to adjust the pH to 7, and then 1200 g / t of collector A, 500 g / t of inhibitor B and 20 g / t of pine oil were added to perform a roughing operation to obtain a roughing concentrate and a roughing tailing;

[0074] S3. Add 150 g / t of Collector A to the rougher concentrate for one-stage concentration to obtain concentrated ore I and concentrated middlings I; add 50 g / t of Collector A to the concentrated concentrate I for two-stage concentration to obtain concentrated ore II and concentrated middlings II; and perform three-stage concentration on the concentrated concentrate II to obtain copper concentrate and concentrated middlings III; wherein, the concentrated middlings II and concentrated middlings III are returned to the previous stage for re-selection;

[0075] S4. Add 70 g / t of collector A to the rougher tailings to carry out a first-stage open-circuit roughing to obtain an open-circuit rougher concentrate I and an open-circuit rougher tailing I; add 50 g / t of collector A to the open-circuit rougher tailings I to carry out a second-stage open-circuit roughing to obtain an open-circuit rougher concentrate II and an open-circuit rougher tailing II; add 15 g / t of collector A to the open-circuit rougher tailings II to carry out a third-stage open-circuit roughing to obtain an open-circuit rougher concentrate III and an open-circuit rougher tailing III; the open-circuit rougher concentrate I, the open-circuit rougher concentrate II, and the open-circuit rougher concentrate III are mixed to obtain an open-circuit rougher concentrate;

[0076] 20 g / t of copper sulfate as an activator and 100 g / t of butyl xanthate as a collector were added to the open-circuit rougher concentrate to perform a rougher separation to obtain rougher concentrate IV and rougher tailings IV;

[0077] The rougher concentrate IV is subjected to a first-stage concentration to obtain a concentrated concentrate V and a concentrated middling V; the concentrated concentrate V is subjected to a second-stage concentration to obtain a concentrated concentrate VI and a concentrated middling VI;

[0078] 20 g / t butyl xanthate was added to the concentrated ore VI for one-stage scavenging to obtain scavenged ore VII and scavenged tailings VII; 20 g / t butyl xanthate was added to the scavenged tailings VII for two-stage scavenging to obtain scavenged ore VIII and scavenged tailings VIII; 10 g / t butyl xanthate was added to the scavenged tailings VIII for three-stage scavenging to obtain scavenged ore IX and scavenged tailings IX (sulfur-containing tailings).

[0079] Wherein, collector A includes

[0080] The inhibitor B comprises sodium cyanamide, sodium dicyanamide, sodium polymelamine (molecular weight of 1000-1500) and sodium polysulfide in a mass ratio of 2:10:3:1.5.

[0081] Example 2

[0082] The flotation separation method of copper-sulfur polymetallic ore provided in this embodiment includes the following steps:

[0083] S1. The raw ore is a copper-sulfur polymetallic ore; the metal minerals include chalcopyrite and pyrite, and the gangue minerals include quartz and mica; the average grade of copper in the raw ore is 0.4%, the average grade of sulfur is 1.6%, and the average grade of iron is 2.0%;

[0084] The raw ore is semi-autogenously ground for 0.17 h, and then segment-milled or ball-milled for 0.23 h to obtain ground ore;

[0085] The particles with a size of less than 0.074 mm accounted for 69 wt% of the grinding material. In the grinding material, the exposure ratio of the 112 crystal plane of chalcopyrite was 62%, the exposure ratio of the 204 crystal plane was 13%, the exposure ratio of the 312 crystal plane was 8%, and the exposure ratio of the 100 crystal plane of pyrite was 75%.

[0086] S2. Water was added to the ground material to adjust the mass concentration of the slurry to 30 wt %, lime was added to adjust the pH to 7, and then 1500 g / t of collector A, 1000 g / t of inhibitor B and 25 g / t of pine oil were added to perform a roughing operation to obtain a roughing concentrate and a roughing tailing;

[0087] S3. Add 200 g / t of collector A to the rougher concentrate for primary concentration to obtain concentrated ore I and concentrated middlings I; add 100 g / t of collector A to the concentrated concentrate I for secondary concentration to obtain concentrated ore II and concentrated middlings II; and perform tertiary concentration on the concentrated concentrate II to obtain copper concentrate and concentrated middlings III; wherein, the concentrated middlings II and concentrated middlings III are returned to the previous stage for re-selection;

[0088] S4. Add 80 g / t of collector A to the rougher tailings to carry out a first-stage open-circuit roughing to obtain an open-circuit rougher concentrate I and an open-circuit rougher tailing I; add 60 g / t of collector A to the open-circuit rougher tailings I to carry out a second-stage open-circuit roughing to obtain an open-circuit rougher concentrate II and an open-circuit rougher tailing II; add 30 g / t of collector A to the open-circuit rougher tailings II to carry out a third-stage open-circuit roughing to obtain an open-circuit rougher concentrate III and an open-circuit rougher tailing III; the open-circuit rougher concentrate I, the open-circuit rougher concentrate II and the open-circuit rougher concentrate III are mixed to obtain an open-circuit rougher concentrate;

[0089] 30 g / t of copper sulfate as an activator and 150 g / t of butyl xanthate as a collector were added to the open-circuit rougher concentrate to perform a rougher separation to obtain rougher concentrate IV and rougher tailings IV;

[0090] The rougher concentrate IV is subjected to a first-stage concentration to obtain a concentrated concentrate V and a concentrated middling V; the concentrated concentrate V is subjected to a second-stage concentration to obtain a concentrated concentrate VI and a concentrated middling VI;

[0091] 40 g / t butyl xanthate was added to the concentrated ore VI for one-stage scavenging to obtain scavenged ore VII and scavenged tailings VII; 40 g / t butyl xanthate was added to the scavenged tailings VII for two-stage scavenging to obtain scavenged ore VIII and scavenged tailings VIII; 20 g / t butyl xanthate was added to the scavenged tailings VIII for three-stage scavenging to obtain scavenged ore IX and scavenged tailings IX (sulfur-containing tailings).

[0092] Wherein, collector A includes

[0093] The inhibitor B comprises sodium cyanamide, sodium dicyanamide, sodium polymelamine (molecular weight of 1000-1500) and sodium polysulfide in a mass ratio of 3:12:6:2.

[0094] Example 3

[0095] The flotation separation method of copper-sulfur polymetallic ore provided in this embodiment includes the following steps:

[0096] S1. The raw ore is a copper-sulfur polymetallic ore; the metal minerals include chalcopyrite and pyrite, and the gangue minerals include quartz and mica; the average grade of copper in the raw ore is 0.4%, the average grade of sulfur is 1.6%, and the average grade of iron is 2.0%;

[0097] The raw ore is semi-autogenously ground for 0.15 h, and then segment-milled or ball-milled for 0.18 h to obtain ground ore;

[0098] The particles with a size of less than 0.074 mm accounted for 62 wt% of the grinding material. In the grinding material, the exposure ratio of the 112 crystal plane of chalcopyrite was 55%, the exposure ratio of the 204 crystal plane was 5%, the exposure ratio of the 312 crystal plane was 3%, and the exposure ratio of the 100 crystal plane of pyrite was 60%.

[0099] S2. Water was added to the ground material to adjust the mass concentration of the slurry to 30 wt %, lime was added to adjust the pH to 7, and then 1000 g / t of collector A, 300 g / t of inhibitor B and 15 g / t of pine oil were added to perform a roughing operation to obtain a roughing concentrate and a roughing tailing;

[0100] S3. Add 120 g / t of collector A to the rougher concentrate for one-stage concentration to obtain concentrated ore I and concentrated middlings I; add 50 g / t of collector A to the concentrated concentrate I for two-stage concentration to obtain concentrated ore II and concentrated middlings II; and perform three-stage concentration on the concentrated concentrate II to obtain copper concentrate and concentrated middlings III; wherein, the concentrated middlings II and concentrated middlings III are returned to the previous stage for re-selection;

[0101] S4. Add 70 g / t of collector A to the rougher tailings to carry out a first-stage open-circuit roughing to obtain an open-circuit rougher concentrate I and an open-circuit rougher tailing I; add 50 g / t of collector A to the open-circuit rougher tailings I to carry out a second-stage open-circuit roughing to obtain an open-circuit rougher concentrate II and an open-circuit rougher tailing II; add 10 g / t of collector A to the open-circuit rougher tailings II to carry out a third-stage open-circuit roughing to obtain an open-circuit rougher concentrate III and an open-circuit rougher tailing III; the open-circuit rougher concentrate I, the open-circuit rougher concentrate II and the open-circuit rougher concentrate III are mixed to obtain an open-circuit rougher concentrate;

[0102] 15 g / t of copper sulfate as an activator and 80 g / t of butyl xanthate as a collector were added to the open-circuit rougher concentrate to perform a rougher separation to obtain rougher concentrate IV and rougher tailings IV.

[0103] The rougher concentrate IV is subjected to a first-stage concentration to obtain a concentrated concentrate V and a concentrated middling V; the concentrated concentrate V is subjected to a second-stage concentration to obtain a concentrated concentrate VI and a concentrated middling VI;

[0104] 20 g / t butyl xanthate was added to the concentrated ore VI for one-stage scavenging to obtain scavenged ore VII and scavenged tailings VII; 20 g / t butyl xanthate was added to the scavenged tailings VII for two-stage scavenging to obtain scavenged ore VIII and scavenged tailings VIII; 10 g / t butyl xanthate was added to the scavenged tailings VIII for three-stage scavenging to obtain scavenged ore IX and scavenged tailings IX (sulfur-containing tailings).

[0105] Wherein, collector A includes

[0106] The inhibitor B comprises sodium cyanamide, sodium dicyanamide, sodium polymelamine (molecular weight of 1000-1500) and sodium polysulfide in a mass ratio of 2:8:3:1 (4:16:6:2).

[0107] Comparative Example 1

[0108] The flotation separation method for copper-sulfur polymetallic ore provided in this comparative example refers to Example 1, except that, in step S1, the raw ore is crushed and screened to 95 wt% of -10 mm, and then ball milled for 0.2 h to obtain a ground material; particles with a particle size of less than 0.074 mm account for 62 wt% of the ground material; and in the ground material, the 112 crystal plane exposure ratio of chalcopyrite is 53%, the 204 crystal plane exposure ratio is 7%, the 312 crystal plane exposure ratio is 5%, and the 100 crystal plane exposure ratio of pyrite is 55%;

[0109] Comparative Example 2

[0110] The flotation separation method of copper-sulfur polymetallic ore provided in this comparative example refers to Example 1, except that the collector A is ethionamide and the inhibitor B is lime.

[0111] Test Example 1

[0112] In the flotation separation methods for copper-sulfur polymetallic ores of Examples 1 to 3 and Comparative Examples 1 to 2, the average grades and recoveries of copper and sulfur are shown in Table 1.

[0113] Table 1

[0114]

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flotation separation method for copper-sulfur polymetallic ore, characterized in that: The steps include: S1. Grinding the raw ore to obtain a ground material; in the ground material, the 112 crystal plane exposure ratio of chalcopyrite is 55% to 65%, the 204 crystal plane exposure ratio is 5% to 18%, the 312 crystal plane exposure ratio is 3% to 10%, and the 100 crystal plane exposure ratio of pyrite is 60% to 80%; S2, after the ground material is slurried and pH adjusted in sequence, collector A, inhibitor B and foaming agent are added to perform a roughing operation to obtain a roughing concentrate and a roughing tailing; S3, the rougher concentrate and collector A are mixed and subjected to multiple concentrations to obtain a copper concentrate; S4, performing cascade enhanced flotation on the roughing tailings to obtain sulfur-containing tailings; The collector A comprises The inhibitor B includes sodium cyanamide, sodium dicyanamide, sodium polymelamide and sodium polysulfide.

2. The flotation separation method of copper-sulfur polymetallic ore according to claim 1, characterized in that: In step S1, the average copper grade of the raw ore is 0.2% to 0.6%, and the average sulfur grade is 1% to 2%.

3. The flotation separation method of copper-sulfur polymetallic ore according to claim 1, characterized in that: In step S1, the grinding process includes sequentially performing a first-stage grinding process and a second-stage grinding process, wherein the first-stage grinding process includes semi-autogenous grinding, and the second-stage grinding process includes ball milling and / or stage milling.

4. The flotation separation method of copper-sulfur polymetallic ore according to claim 1, characterized in that: In step S2, the mass ratio of the sodium cyanamide, the sodium dicyanamide, the sodium polymelamine and the sodium polysulfide is (1-5): (10-17): (2-7): (1-2).

5. The flotation separation method of copper-sulfur polymetallic ore according to claim 1, characterized in that: In step S2, during the primary roughing process, the amount of the collector A added is 1000-2000 g / t, and the amount of the inhibitor B added is 50-1500 g / t.

6. The flotation separation method of copper-sulfur polymetallic ore according to claim 1, characterized in that: In step S3, the multiple selections include three selections or four selections.

7. The flotation separation method of copper-sulfur polymetallic ore according to claim 6, characterized in that: In step S3, in the first stage and second stage of the multiple cleaning processes, the amount of the collector A added is independently 50 to 200 g / t.

8. The flotation separation method of copper-sulfur polymetallic ore according to claim 1, characterized in that: In step S4, the step-enhanced flotation comprises: The rougher tailings are subjected to three open-circuit roughing operations to obtain an open-circuit rougher concentrate; The open-circuit roughing concentrate is subjected to flotation to obtain the sulfur-containing tailings; the flotation includes primary roughing, secondary cleaning and tertiary scavenging.

9. The flotation separation method of copper-sulfur polymetallic ore according to claim 8, characterized in that: In step S4, the three-time open-circuit roughing includes: adding 10-80 g / t of the collector A to perform three-time open-circuit roughing.

10. The flotation separation method of copper-sulfur polymetallic ore according to claim 8, characterized in that: In step S4, the first roughing step includes: adding 10-35 g / t of activator and 50-150 g / t of butyl xanthate for a first roughing step; the third scavenging step includes: adding 10-50 g / t of butyl xanthate for three scavenging steps.

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