Branch step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ore

Abstract

The invention relates to the technical field of mineral separation, in particular to a branch step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ore. The method specifically comprises the following steps that raw ore grinding products are divided into two branches, the two branches are subjected to two-section roughing operation after size mixing treatment, roughing concentrate is subjected to rapid column flotation, and copper-molybdenum bulk concentrate is obtained; primary roughing tailings are fed into secondary roughing operation, and secondary roughing concentrate is subjected to pre-grading, regrinding and grading checking operation and then is fed into subsequent operation; the copper-sulfur separation operation adopts one-time roughing, two-time concentration and two-time scavenging for ore pulp step-by-step collection. According to the method, on the basis of ore pulp characteristics, the composite collecting agent and the inhibitor are adopted, valuable metal is recycled in a branched and step-by-step mode, the recovery rate of copper reaches 88% or above, the recovery rate of molybdenum reaches 67% or above, and efficient recovery of complex low-grade copper-molybdenum-sulfur associated polymetallic ore resources is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a branched and step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ores. Background Art

[0002] With the development of economy and society, the demand for copper is increasing year by year. With the rapid development of high-grade copper resources, the recovery of low-grade complex co-existing porphyry copper ores has become increasingly important.

[0003] There are mainly the following types of structures in porphyry copper ores: (1) euhedral and semi-euhedral granular structures, mainly manifested by chalcopyrite and pyrite often being distributed in gangue minerals in semi-euhedral granular structures; (2) vein-like and stockwork-like structures, mainly manifested by chalcopyrite filling in pyrite cracks in vein or stockwork-like forms, and a small amount of pyrite being distributed in gangue minerals in vein-like forms; (3) inclusion structures, mainly manifested by coarse-grained chalcopyrite encapsulating fine-grained tetrahedrite and pyrite to form inclusion structures. Metallic minerals such as chalcopyrite and pyrite in the original ore are often scattered in the gangue minerals in different particle sizes to form impregnation structures, as well as vein-like stockwork-like structures. Different minerals coexist closely and have complex intercalation relationships. This has led to the current situation where copper mineral collectors and pyrite inhibitors are not suitable, the recovery rate of valuable metals is low, and development and utilization are difficult. Summary of the invention

[0004] The purpose of the present invention is to provide a branch-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ores, which adopts different collectors and inhibitors for branch-step cascade flotation based on the mineral dissociation characteristics, reduces the amount of lime used in the copper-sulfur separation process, improves the recovery efficiency of valuable metals, and reduces the recovery cost.

[0005] In order to achieve the above-mentioned purpose of the present invention, the following technical scheme is specially adopted: a branched and step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ores, the recovery method specifically comprises the following steps:

[0006] S1) subjecting the complex low-grade copper-molybdenum-sulfur polymetallic ore to be processed to a first-stage grinding process to obtain a grinding material;

[0007] S2) mixing the ground ore obtained in S1) with a collector and a frother and performing a first roughing, thereby obtaining a first roughing concentrate and a first roughing tailings;

[0008] The first rougher concentrate is mixed with a composite depressant and subjected to a rapid column flotation through a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing;

[0009] The column flotation tailings are subjected to a scavenging operation to obtain a first scavenging concentrate and a first scavenging tailings;

[0010] S3) mixing the first roughing tailing obtained in S2) with a collector and a frother, and then performing a second roughing to obtain a second roughing concentrate and a second roughing tailing;

[0011] The second rougher tailings are subjected to two scavenging operations, and the scavenged concentrates are sequentially returned to the upper operation, and the scavenged tailings are the final tailings;

[0012] The second rougher concentrate is pre-classified to obtain a first undersize and a first oversize; the first oversize is subjected to a second-stage grinding process to obtain a ground material;

[0013] The material after grinding is inspected and classified to obtain a second oversize material and a second undersize material; the second oversize material is returned for a second-stage grinding process;

[0014] The second undersize material is mixed with the first undersize material to obtain a mixed material; and the concentration and pH of the mixed material are adjusted and then fed into a copper-sulfur separation flotation operation;

[0015] S4) The mixed material in S3) is mixed with a composite inhibitor and a collector, and then subjected to a stepwise recovery operation of one roughing selection, two cleaning selections and two scavenging selections to obtain copper concentrate and second-stage tailings.

[0016] Furthermore, the grinding concentration in S1) is 75% to 77%, the medium filling rate is 30% to 35%, and the proportion of materials with a particle size of -0.074 mm in the grinding product is 65% to 72%.

[0017] Further, the first roughing process in S2) is specifically as follows:

[0018] The ground material is slurried, lime is added to adjust the pH value to 7-8, and a collector and a frother are added to perform a roughing operation to obtain the first roughing concentrate and the first roughing tailings;

[0019] Wherein, the addition amount of the collector is 12-15 g / t; the addition amount of the foaming agent is 10-13 g / t;

[0020] The mixing ratio of the first rougher concentrate to the composite depressant is 1250-3200:1.

[0021] Further, the collector is ethylthiocarbamate;

[0022] The inhibitor is prepared by mixing polyaniline lignin (CAS: 313949-90-5), hydroxypropyl starch ether (CAS: 9049-76-7) and hydroxyethyl starch (CAS: 005-27-0), with a mass ratio of 1-15: 2-5: 1-5.

[0023] Further, the amount of the collector added in the second rough selection in S3) is 40-50 g / t, and the amount of the foaming agent added is 5-10 g / t;

[0024] The second-stage grinding process includes: the grinding concentration is 54% to 58%, and the medium filling rate is 25% to 30%.

[0025] Further, the specific process of copper-sulfur separation in S3) is: adding lime to the mixture to adjust the pH to 8-9, adding a composite inhibitor and a collector to perform a roughing, and obtaining a roughing concentrate and a roughing tailing;

[0026] A composite depressant is added to the roughing concentrate for secondary concentration to obtain the copper concentrate; and a collector is added to the roughing tailings for secondary scavenging to obtain the sulfur-containing tailings.

[0027] Furthermore, during the primary roughing process, the amount of the composite inhibitor added is 5-25 g / t, and the amount of the collector added is 2-5 g / t;

[0028] The amount of composite inhibitor added during the secondary concentration process is 5 to 12.5 g / t;

[0029] The amount of collector added during the secondary scavenging process is 2-5 g / t.

[0030] Furthermore, the collector is one or more of sodium n-butyl xanthate, ethyl isobutyl xanthate and sodium thiocarbamate.

[0031] The inhibitor is a mixture of polyaniline lignin (CAS: 313949-90-5), hydroxypropyl starch ether (CAS: 9049-76-7) and hydroxyethyl starch (CAS: 005-27-0) in a mass ratio of 1-15: 2-5: 1-5;

[0032] The collector is one or more of sodium n-butyl xanthate, ethyl isobutyl xanthate and sodium thiocarbamate.

[0033] Furthermore, the recovery rate of copper in the recovery method reaches more than 88%, and the recovery rate of molybdenum reaches more than 67%.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The flotation method of copper sulfide ore provided by the present invention adopts branch rapid flotation to preferentially recover the dissociated copper-molybdenum mixed minerals and stepwise recover the poor intergrowths according to the distribution characteristics of minerals in low-grade copper-molybdenum-sulfur polymetallic ores, the coexistence characteristics of rich intergrowths and poor intergrowths, and the dissociation characteristics of minerals after grinding, thereby realizing step-by-step branch recovery of valuable metals.

[0036] The novel collector and novel pyrite inhibitor proposed in the present invention significantly reduce the amount of lime used, while greatly improving the capture effect of copper minerals and the recovery rate of valuable metals. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention is a flowchart of a branched and step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ores. DETAILED DESCRIPTION

[0038] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be appreciated 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, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0039] like Figure 1 As shown, the present invention provides a branched and step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ores, and the recovery method specifically comprises the following steps:

[0040] S1) subjecting the complex low-grade copper-molybdenum-sulfur polymetallic ore to be processed to a first-stage grinding process to obtain a grinding material;

[0041] S2) mixing the ground ore obtained in S1) with a collector and a frother and performing a first roughing, thereby obtaining a first roughing concentrate and a first roughing tailings;

[0042] The first rougher concentrate is mixed with a composite depressant and subjected to a rapid column flotation through a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing;

[0043] The column flotation tailings are subjected to a scavenging operation to obtain a first scavenging concentrate and a first scavenging tailings;

[0044] S3) mixing the first roughing tailing obtained in S2) with a collector and a frother, and then performing a second roughing to obtain a second roughing concentrate and a second roughing tailing;

[0045] The second rougher tailings are subjected to two scavenging operations, and the scavenged concentrates are sequentially returned to the upper operation, and the scavenged tailings are the final tailings;

[0046] The second rougher concentrate is pre-classified to obtain a first undersize and a first oversize; the first oversize is subjected to a second-stage grinding process to obtain a ground material;

[0047] The material after grinding is inspected and classified to obtain a second oversize material and a second undersize material; the second oversize material is returned for a second-stage grinding process;

[0048] The second undersize material is mixed with the first undersize material to obtain a mixed material; and the concentration and pH of the mixed material are adjusted and then fed into a copper-sulfur separation flotation operation;

[0049] S4) The mixed material in S3) is mixed with a composite inhibitor and a collector, and then subjected to a stepwise recovery operation of one roughing selection, two cleaning selections and two scavenging selections to obtain copper concentrate and second-stage tailings.

[0050] Example 1

[0051] In some embodiments of the present invention, a branched and step-by-step efficient recovery method for a complex low-grade copper-molybdenum-sulfur polymetallic ore is provided, comprising the following steps:

[0052] S1. The raw ore is subjected to a first-stage grinding process to obtain a ground material; the particles with a particle size of less than 0.074 mm account for 65% of the ground material, the slurry concentration is adjusted to 33%, and the branch is fed into two-stage roughing operations, the grinding concentration is 75%, the medium filling rate is 30%, and the material with a particle size of -0.074 mm accounts for 65% of the ground product.

[0053] S2, after mixing the slurry in S1 with a collector and a frother and performing the first roughing, lime is added to adjust the pH to 8, and the amount of the collector added is 15g / t, to obtain a first roughing concentrate and a first roughing tailing; the first roughing concentrate is subjected to a rapid column flotation by a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing; the column flotation tailing is subjected to a scavenging, to obtain a first scavenging concentrate and a first scavenging tailing;

[0054] Wherein, the main component of the collector is ethylthiocarbamate, and the addition amount is 15g / t;

[0055] The inhibitor is prepared by mixing polyaniline lignin (CAS: 313949-90-5), hydroxypropyl starch ether (CAS: 9049-76-7) and hydroxyethyl starch (CAS: 005-27-0), with a mass ratio of 1-15: 2-5: 1-5.

[0056] S3, the first roughing tailings in S2 are mixed with a collector and a frother, and then subjected to a second roughing to obtain a second roughing concentrate and a second roughing tailings; the second roughing tailings are subjected to two scavenging operations, and the scavenging concentrates are sequentially returned to the upper operation, and the scavenging tailings are the final tailings; the second roughing concentrate is pre-classified to obtain a first undersize and a first oversize; the first oversize is subjected to two-stage grinding, with a grinding concentration of 54% and a medium filling rate of 25% to obtain a ground material; the ground material is inspected and classified to obtain a second oversize and a second undersize; the second oversize is returned for two-stage grinding; the second undersize is mixed with the first undersize to obtain a mixed material; the concentration and pH of the mixed material are adjusted and then fed into the copper-sulfur separation flotation operation;

[0057] Wherein, the main component of the collector is sodium n-butyl xanthate, and the added amount is 50g / t.

[0058] S4, adding lime to the mixed material in S3 to adjust the pH to 8, and then mixing with an inhibitor and a collector to perform a step-by-step recovery operation of one roughing, two cleanings and two scavengings to obtain copper concentrate and second-stage tailings;

[0059] The inhibitor is a mixture of polyaniline lignin (CAS: 313949-90-5), hydroxypropyl starch ether (CAS: 9049-76-7) and hydroxyethyl starch (CAS: 005-27-0) in a mass ratio of 11:3:4; the main component of the collector is sodium n-butyl xanthate;

[0060] During the primary roughing process, the amount of the inhibitor added was 25 g / t, and the amount of the collector added was 5 g / t; during the secondary cleaning process, the amount of the inhibitor added was 12.5 g / t. During the secondary scavenging process, the amount of the collector added was 5 g / t.

[0061] Example 2

[0062] In some embodiments of the present invention, a branched and step-by-step efficient recovery method for a complex low-grade copper-molybdenum-sulfur polymetallic ore is provided, comprising the following steps:

[0063] S1. The raw ore is subjected to a first-stage grinding process to obtain a ground material; the particles with a particle size of less than 0.074 mm account for 68% of the ground material, the slurry concentration is adjusted to 28%, and the branch is fed into two-stage roughing operations, the grinding concentration is 77%, and the medium filling rate is 32%.

[0064] S2, after mixing the slurry in S1 with a collector and a frother and performing the first roughing, lime is added to adjust the pH to 8, and the amount of collector added is 12 g / t, to obtain a first roughing concentrate and a first roughing tailing; the first roughing concentrate is subjected to a rapid column flotation by a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing; the column flotation tailing is subjected to a scavenging, to obtain a first scavenging concentrate and a first scavenging tailing;

[0065] Wherein, the collector is ethylthiocarbamate, and the addition amount of the collector is 12g / t;

[0066] S3, S2: the first roughing tailings are mixed with a collector and then subjected to a second roughing to obtain a second roughing concentrate and a second roughing tailings; the second roughing tailings are subjected to two scavenging operations, and the scavenging concentrates are sequentially returned to the upper operation, and the scavenging tailings are the final tailings; the second roughing concentrates in the two slurry flows are pre-classified to obtain a first undersize and a first oversize; the first oversize is subjected to a two-stage grinding process, with a grinding concentration of 55% and a medium filling rate of 30% to obtain a ground material; the ground material is inspected and classified to obtain a second oversize and a second undersize; the second oversize is returned for a two-stage grinding process; the second undersize is mixed with the first undersize to obtain a mixed material; the concentration and pH of the mixed material are adjusted and then fed into the copper-sulfur separation flotation operation;

[0067] Wherein, the main component of the collector is sodium n-butyl xanthate, and the addition amount is 45g / t;

[0068] S4, adding lime to the mixed material in S3 to adjust the pH to 8, and then mixing with an inhibitor and a collector to perform a step-by-step recovery operation of one roughing, two cleanings and two scavengings to obtain copper concentrate and second-stage tailings;

[0069] The inhibitor is a mixture of polyaniline lignin (CAS: 313949-90-5), hydroxypropyl starch ether (CAS: 9049-76-7) and hydroxyethyl starch (CAS: 005-27-0) in a mass ratio of 15:5:3; the main component of the collector is sodium n-butyl xanthate;

[0070] During the primary roughing process, the amount of the inhibitor added was 20 g / t, and the amount of the collector added was 3 g / t. During the secondary cleaning process, the amount of the inhibitor added was 10 g / t. During the secondary scavenging process, the amount of the collector sodium n-butyl xanthate added was 3 g / t.

[0071] Example 3

[0072] In some embodiments of the present invention, a branched and step-by-step efficient recovery method for a complex low-grade copper-molybdenum-sulfur polymetallic ore is provided, comprising the following steps:

[0073] S1. The raw ore is subjected to a first-stage grinding process to obtain a ground material; the particles with a particle size of less than 0.074 mm account for 70wt% of the ground material, the slurry concentration is adjusted to 30%, and the slurry is fed into two-stage roughing operations, the grinding concentration is 76%, and the medium filling rate is 33%.

[0074] S2, after mixing the slurry in S1 with a collector and a frother and performing the first roughing, lime is added to adjust the pH to 7, and the amount of the collector added is 10 g / t, to obtain a first roughing concentrate and a first roughing tailing; the first roughing concentrate is subjected to a rapid column flotation by a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing; the column flotation tailing is subjected to a scavenging, to obtain a first scavenging concentrate and a first scavenging tailing;

[0075] Wherein, the collector is ethylthiocarbamate, and the addition amount of the collector is 10g / t;

[0076] S3, S2: the first roughing tailings are mixed with a collector for a second roughing to obtain a second roughing concentrate and a second roughing tailings; the second roughing tailings are subjected to two scavenging operations, and the scavenging concentrates are sequentially returned to the upper operation, and the scavenging tailings are the final tailings; the second roughing concentrates in the two pulp flows are pre-classified to obtain a first undersize and a first oversize; the first oversize is subjected to a two-stage grinding process with a grinding concentration of 55% and a medium filling rate of 30% to obtain a ground material; the ground material is inspected and classified to obtain a second oversize and a second undersize; the second oversize is returned for a two-stage grinding process; the second undersize is mixed with the first undersize to obtain a mixed material; the concentration and pH of the mixed material are adjusted and then fed into the copper-sulfur separation flotation operation;

[0077] Wherein, the main component of the collector is sodium n-butyl xanthate, and the addition amount is 40g / t;

[0078] S4, adding lime to the mixed material in S3 to adjust the pH to 8, mixing with an inhibitor and a collector to perform a roughing selection, a cleaning selection and a scavenging selection in steps to obtain a copper concentrate and a second-stage tailings;

[0079] The inhibitor is a mixture of polyaniline lignin (CAS: 313949-90-5), hydroxypropyl starch ether (CAS: 9049-76-7) and hydroxyethyl starch (CAS: 005-27-0) in a mass ratio of 7:5:5; the main component of the collector is sodium n-butyl xanthate;

[0080] During the primary roughing process, the amount of the inhibitor KDY-2 added was 15 g / t, and the amount of the collector sodium n-butyl xanthate added was 2 g / t. During the secondary cleaning process, the amount of the inhibitor added was 5 g / t. During the secondary scavenging process, the amount of the collector sodium n-butyl xanthate added was 3 g / t.

[0081] Comparative Example 1

[0082] In some embodiments of the present invention, a branched and step-by-step efficient recovery method for a complex low-grade copper-molybdenum-sulfur polymetallic ore is provided, comprising the following steps:

[0083] S1. The raw ore is subjected to a first-stage grinding process to obtain a ground material; the particles with a particle size of less than 0.074 mm account for 70wt% of the ground material, the slurry concentration is adjusted to 30%, and the slurry is fed into two-stage roughing operations, the grinding concentration is 76%, and the medium filling rate is 33%.

[0084] S2, after mixing the slurry in S1 with a collector and a frother and performing the first roughing, lime is added to adjust the pH to 7, and the amount of collector added is 10g / t, to obtain a first roughing concentrate and a first roughing tailing; the first roughing concentrate is subjected to a rapid column flotation by a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing; the column flotation tailing is subjected to a scavenging to obtain a first scavenging concentrate and a first scavenging tailing; the first roughing tailing is subjected to a second roughing to obtain a second roughing concentrate and a second roughing tailing; the second roughing tailing is subjected to two scavenging operations, and the scavenging concentrate is sequentially returned to the upper operation, and the scavenging tailing is the final tailing;

[0085] Wherein, the collector is tert-butyl xanthate, and the addition amount of the collector is 10g / t;

[0086] S3, pre-classifying the second roughing concentrates in the two pulp streams to obtain a first undersize and a first oversize; performing two-stage grinding on the first oversize, with a grinding concentration of 55% and a medium filling rate of 30%, to obtain a ground material; performing inspection and classification on the ground material to obtain a second oversize and a second undersize; returning the second oversize for two-stage grinding; mixing the second undersize with the first undersize to obtain a mixed material; and adjusting the concentration and pH of the mixed material before feeding it into the copper-sulfur separation flotation operation;

[0087] S4, adding lime to the mixed material in S3 to adjust the pH to 8, performing a roughing, a cleaning and a scavenging step-by-step recovery operation to obtain copper concentrate and second-stage tailings;

[0088] During the primary roughing process, the amount of the inhibitor lime added was 2000 g / t, and the amount of the collector sodium n-butyl xanthate added was 40 g / t. During the secondary cleaning process, the amount of the inhibitor lime added was 500 g / t. During the secondary scavenging process, the amount of the collector sodium n-butyl xanthate added was 8 g / t.

[0089] Comparative Example 2

[0090] In some embodiments of the present invention, a branched and step-by-step efficient recovery method for a complex low-grade copper-molybdenum-sulfur polymetallic ore is provided, comprising the following steps:

[0091] S1. The raw ore is subjected to a first-stage grinding process to obtain a ground material; the particles with a particle size of less than 0.074 mm account for 65% of the ground material, the slurry concentration is adjusted to 28%, and the branch is fed into two-stage roughing operations, the grinding concentration is 75%, and the medium filling rate is 30%.

[0092] S2, after mixing the slurry in S1 with a collector and a frother and performing the first roughing, lime is added to adjust the pH to 8, and the amount of collector added is 15g / t, to obtain a first roughing concentrate and a first roughing tailing; the first roughing concentrate is subjected to a rapid column flotation by a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing; the column flotation tailing is subjected to a scavenging to obtain a first scavenging concentrate and a first scavenging tailing; the first roughing tailing is subjected to a second roughing to obtain a second roughing concentrate and a second roughing tailing; the second roughing tailing is subjected to two scavenging operations, and the scavenging concentrate is sequentially returned to the upper operation, and the scavenging tailing is the final tailing;

[0093] Wherein, the collector is butyl flavonoids, and the amount of the collector added is 15g / t;

[0094] S3, pre-classifying the second roughing concentrates in the two pulp streams to obtain a first undersize and a first oversize; performing two-stage grinding on the first oversize, with a grinding concentration of 50% and a medium filling rate of 28%, to obtain a ground material; performing inspection and classification on the ground material to obtain a second oversize and a second undersize; returning the second oversize for two-stage grinding; mixing the second undersize with the first undersize to obtain a mixed material; and adjusting the concentration and pH of the mixed material before feeding it into a copper-sulfur separation flotation operation;

[0095] S4, adding lime to the mixed material in S3 to adjust the pH to 13, performing a roughing operation, two cleaning operations and two scavenging operations in a step-by-step recovery process to obtain copper concentrate and second-stage tailings;

[0096] During the primary roughing process, the amount of the inhibitor lime added was 2100 g / t, and the amount of the collector sodium n-butyl xanthate added was 40 g / t. During the secondary cleaning process, the amount of the inhibitor lime added was 800 g / t. During the secondary scavenging process, the amount of the collector sodium n-butyl xanthate added was 15 g / t.

[0097] Comparative Example 3

[0098] In some embodiments of the present invention, a branched and step-by-step efficient recovery method for a complex low-grade copper-molybdenum-sulfur polymetallic ore is provided, comprising the following steps:

[0099] S1. The raw ore is subjected to a first-stage grinding process to obtain a ground material; the particles with a particle size of less than 0.074 mm account for 70wt% of the ground material, the slurry concentration is adjusted to 30%, and the slurry is fed into two-stage roughing operations, the grinding concentration is 76%, and the medium filling rate is 33%.

[0100] S2, after mixing the slurry in S1 with a collector and a frother and performing the first roughing, lime is added to adjust the pH to 8, and the amount of collector added is 15g / t, to obtain a first roughing concentrate and a first roughing tailing; the first roughing concentrate is subjected to a rapid column flotation by a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing; the column flotation tailing is subjected to a scavenging to obtain a first scavenging concentrate and a first scavenging tailing; the first roughing tailing is subjected to a second roughing to obtain a second roughing concentrate and a second roughing tailing; the second roughing tailing is subjected to two scavenging operations, and the scavenging concentrate is sequentially returned to the upper operation, and the scavenging tailing is the final tailing;

[0101] Wherein, the collector is n-butyl xanthate, and the addition amount of the collector is 15g / t;

[0102] S3, pre-classifying the second roughing concentrates in the two pulp streams to obtain a first undersize and a first oversize; performing two-stage grinding on the first oversize, with a grinding concentration of 50% and a medium filling rate of 24%, to obtain a ground material; performing inspection and classification on the ground material to obtain a second oversize and a second undersize; returning the second oversize for two-stage grinding; mixing the second undersize with the first undersize to obtain a mixed material; and adjusting the concentration and pH of the mixed material before feeding it into a copper-sulfur separation flotation operation;

[0103] S4, adding lime to the mixed material in S3 to adjust the pH to 13, performing a roughing operation, two cleaning operations and two scavenging operations in a step-by-step recovery process to obtain copper concentrate and second-stage tailings;

[0104] During the primary roughing process, the amount of the inhibitor lime added was 24000 g / t, and the amount of the collector sodium n-butyl xanthate added was 30 g / t. During the secondary cleaning process, the amount of the inhibitor lime added was 3000 g / t. During the secondary scavenging process, the amount of the collector sodium n-butyl xanthate added was 5 g / t.

[0105] The detailed recovery rate data are shown in Table 1. The use of this method can significantly improve the recovery rate of valuable metals.

[0106] Table 1

[0107]

[0108] The above is a detailed introduction to a branched and step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ores provided in the embodiments of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application; at the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0109] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" and "comprising" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description of the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be subject to that defined in the attached claims.

[0110] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0111] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0112] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be included in the claims attached to the present application.

Claims

1. A branched and step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ores, characterized in that: The recovery method specifically comprises the following steps: S1) subjecting the complex low-grade copper-molybdenum-sulfur polymetallic ore to be processed to a first-stage grinding process to obtain a grinding material; S2) mixing the ground ore obtained in S1) with a collector and a frother and performing a first roughing, thereby obtaining a first roughing concentrate and a first roughing tailing; The first rougher concentrate is mixed with a composite depressant and subjected to a rapid column flotation through a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing; The column flotation tailings are subjected to a scavenging operation to obtain a first scavenging concentrate and a first scavenging tailings; S3) mixing the first roughing tailing obtained in S2) with a collector and a frother, and then performing a second roughing to obtain a second roughing concentrate and a second roughing tailing; The second rougher tailings are subjected to two scavenging operations, and the scavenged concentrates are sequentially returned to the upper operation, and the scavenged tailings are the final tailings; The second rougher concentrate is pre-classified to obtain a first undersize and a first oversize; the first oversize is subjected to a second-stage grinding process to obtain a ground material; The material after grinding is inspected and classified to obtain a second oversize material and a second undersize material; the second oversize material is returned for a second-stage grinding process; The second undersize material is mixed with the first undersize material to obtain a mixed material; and the concentration and pH of the mixed material are adjusted and then fed into a copper-sulfur separation flotation operation; S4) The mixed material in S3) is mixed with a composite inhibitor and a collector, and then subjected to a stepwise recovery operation of one roughing selection, two cleaning selections and two scavenging selections to obtain copper concentrate and second-stage tailings.

2. The recycling method according to claim 1, characterized in that: The grinding concentration in S1) is 75% to 77%, the medium filling rate is 30% to 35%, and the proportion of materials with a particle size of -0.074 mm in the grinding product is 65% to 72%.

3. The recycling method according to claim 1, characterized in that: The first roughing process in S2) is specifically as follows: The ground material is slurried, lime is added to adjust the pH value to 7-8, and a collector and a frother are added to perform a roughing operation to obtain the first roughing concentrate and the first roughing tailings; Wherein, the addition amount of the collector is 12-15 g / t; the addition amount of the foaming agent is 10-13 g / t; The mixing ratio of the first rougher concentrate to the composite depressant is 1250-3200:

1.

4. The recycling method according to claim 3, characterized in that: The collector is ethylthiocarbamate; The inhibitor is a mixture of polyaniline lignin, hydroxypropyl starch ether and hydroxyethyl starch, with a mass ratio of 1-15:2-5:1-5.

5. The recycling method according to claim 1, characterized in that: The amount of the collector added in the second rough selection in S3) is 40-50 g / t, and the amount of the foaming agent added is 5-10 g / t; The two-stage grinding process includes: the grinding concentration is 54% to 58%, and the medium filling rate is 25% to 30%.

6. The recycling method according to claim 1, characterized in that: The specific process of copper-sulfur separation in S3) is as follows: when the pH value of the mixed material is adjusted to 8-9 by adding lime, a composite inhibitor and a collector are added to perform a roughing operation to obtain a roughing concentrate and a roughing tailing; A composite depressant is added to the roughing concentrate for secondary concentration to obtain the copper concentrate; and a collector is added to the roughing tailings for secondary scavenging to obtain sulfur-containing tailings.

7. The recycling method according to claim 6, characterized in that: During the primary roughing process, the amount of the composite inhibitor added is 5-25 g / t, and the amount of the collector added is 2-5 g / t; The amount of composite inhibitor added during the secondary concentration process is 5 to 12.5 g / t; The amount of collector added during the secondary scavenging process is 2-5 g / t.

8. The recycling method according to claim 5, characterized in that: The collector is one or more of sodium n-butyl xanthate, ethyl isobutyl xanthate and sodium thiocarbamate; The inhibitor is a mixture of polyaniline lignin, hydroxypropyl starch ether and hydroxyethyl starch, with a mass ratio of 1-15:2-5:1-5; The collector is one or more of sodium n-butyl xanthate, ethyl isobutyl xanthate and sodium thiocarbamate.

9. The recycling method according to claim 1, characterized in that: The recovery rate of copper in the recovery method reaches more than 88%, and the recovery rate of molybdenum reaches more than 67%.

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