A complex low-grade copper-molybdenum-sulfur multi-metal ore branch step-by-step efficient recovery method

Abstract

The present application relates to the technical field of mineral processing, and in particular to a complex low-grade copper-molybdenum-sulfur polymetallic ore branch step efficient recovery method. The method specifically comprises the following steps: the ore grinding product is divided into two branches, and after being treated by slurry adjustment, is respectively fed into two-stage roughing operations, the roughing concentrate is subjected to rapid column flotation to obtain copper-molybdenum mixed concentrate; the once-roughed tailings are fed into second roughing operation, and the second roughing concentrate is subjected to pre-classification, regrinding and classification inspection operations and then fed into subsequent operations; the copper-sulfur separation operation adopts the method of collecting the slurry step by step with once roughing, twice cleaning and twice scavenging. Based on the characteristics of the slurry, the present application adopts composite collectors and depressants to recover valuable metals in branches and steps, the recovery rate of copper reaches more than 88%, the recovery rate of molybdenum reaches more than 67%, and the efficient recovery of complex low-grade copper-molybdenum-sulfur associated polymetallic ore resources is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ore dressing, in particular to a branch step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ore. BACKGROUND

[0002] With the development of economic society, the demand for copper increases year by year. With the rapid development of high-grade copper resources, the recovery of low-grade complex associated porphyry copper ore becomes increasingly important.

[0003] The structures in the porphyry copper ore mainly include the following types: (1) euhedral, half-euhedral granular structure, mainly manifested as chalcopyrite and pyrite commonly distributed in the gangue minerals in the form of half-euhedral granular structure; (2) vein, network vein structure, mainly manifested as chalcopyrite filling in the pyrite fissure in the form of vein or network vein structure, and a small amount of pyrite distributed in the gangue minerals in the form of vein; (3) inclusion structure, mainly manifested as fine-grained tetrahedrite and pyrite wrapped in coarse-grained chalcopyrite to form an inclusion structure. Chalcopyrite, pyrite and other metal minerals in the raw ore are commonly distributed in the gangue minerals in the form of disseminated structure with different particle sizes, and in the form of vein and network vein structure, and different minerals are closely associated with each other, and the embedding relationship is complex. This leads to the current situation that the copper mineral collector and the pyrite inhibitor are not suitable, the recovery rate of valuable metals is low, and the development and utilization are difficult. SUMMARY

[0004] The present application aims to provide a branch step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ore, which uses different collectors and composite inhibitors for branch step-by-step stage flotation based on the dissociation characteristics of minerals, 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 application, the following technical scheme is adopted: a branch step-by-step efficient recovery method for complex low-grade copper-molybdenum-sulfur polymetallic ore, which specifically includes the following steps:

[0006] S1) performing one-stage grinding treatment on the complex low-grade copper-molybdenum-sulfur polymetallic ore to be treated to obtain a ground material;

[0007] S2) mixing the ground material obtained in S1 with a collector and a foaming agent, and performing first roughing to obtain a first roughing concentrate and a first roughing tailing;

[0008] mixing the first roughing concentrate with a composite inhibitor, and performing one-time rapid column flotation by a flotation column to obtain a copper-molybdenum mixed concentrate and a column flotation tailing;

[0009] performing one-time scavenging on the column flotation tailing to obtain a first scavenging concentrate and a first scavenging tailing;

[0010] S3) mixing the first roughing tailings obtained in S2) with a collector and a frother to perform a second roughing to obtain a second roughing concentrate and a second roughing tailings;

[0011] performing two scavenging operations on the second roughing tailings, returning the scavenging concentrates to the upper operation in sequence, and taking the scavenging tailings as the final tailings;

[0012] performing a pre-classification on the second roughing concentrate to obtain a first undersize and a first oversize; performing a two-stage grinding on the first oversize to obtain a ground material;

[0013] performing an inspection classification on the ground material to obtain a second undersize and a second oversize; returning the second oversize to perform a two-stage grinding;

[0014] mixing the second undersize with the first undersize to obtain a mixed material; adjusting the concentration and pH of the mixed material and feeding it into a copper-sulfur separation flotation operation;

[0015] S4) mixing the mixed material in S3) with a composite depressant and a collector to perform a one-stage roughing, two-stage cleaning and two-stage scavenging step-by-step recovery operation to obtain a copper concentrate and a two-stage tailings.

[0016] Further, the grinding concentration in S1) is 75%-77%, the medium filling rate is 30%-35%, and the proportion of -0.074 mm size material in the grinding product is 65%-72%.

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

[0018] adjusting the pulp of the ground material, adjusting the pH to 7-8 by adding lime, adding a collector and a frother to perform a one-stage roughing 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 frother is 10-13 g / t;

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

[0021] Further, the collector is ethyl thiocarbamic acid ester;

[0022] The composite depressant is a mixture of 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 adding amount of the collector in the second roughing in S3) is 40-50 g / t, and the adding amount of the frother is 5-10 g / t.

[0024] The secondary grinding treatment comprises: a grinding concentration of 54%-58% and a medium filling rate of 25%-30%.

[0025] Further, the copper-sulfur separation in S3) is specifically: the mixture is added into lime to adjust pH to 8-9, a composite depressant and a collector are added to carry out primary roughing, to obtain roughing concentrate and roughing tailings;

[0026] The composite depressant is added into the roughing concentrate to carry out secondary concentration, to obtain the copper concentrate; the collector is added into the roughing tailings to carry out secondary scavenging, to obtain the sulfur-containing tailings.

[0027] Further, in the process of the primary roughing, the adding amount of the composite depressant is 5-25 g / t, and the adding amount of the collector is 2-5 g / t.

[0028] In the process of the secondary concentration, the adding amount of the composite depressant is 5-12.5 g / t.

[0029] In the process of the secondary scavenging, the adding amount of the collector is 2-5 g / t.

[0030] Further, the collector is one or more of sodium n-butyl xanthate, isobutyl xanthate and sodium thioglycolate.

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

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

[0033] Further, the recovery rate of copper in the recovery method is above 88%, and the recovery rate of molybdenum is above 67%.

[0034] Compared with the prior art, the beneficial effects of the present application are:

[0035] The flotation method of copper sulfide ore provided by the present application, according to the embedding characteristics of minerals in low-grade copper-molybdenum-sulfur polymetallic ore, the co-occurrence characteristics of rich intergrowth and poor intergrowth, and the dissociation characteristics of minerals after grinding, the mixed copper-molybdenum minerals that have been dissociated are preferentially recovered by adopting branch rapid flotation, the poor intergrowth is recovered in stages, and the valuable metals are recovered in steps.

[0036] The new type of collector and the new type of pyrite depressant greatly reduce the amount of lime while greatly improving the collection effect of copper minerals and improving the recovery rate of valuable metals. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 A flowchart of a complex low-grade copper-molybdenum-sulfur polymetallic ore branch step efficient recovery method. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely in combination with specific embodiments, but those skilled in the art will understand that the following described embodiments are part of the embodiments of the present application, not all the embodiments, and are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. The specific conditions are not specified in the embodiments, which are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not specified by the manufacturer, which are conventional products that can be purchased on the market.

[0039] As shown in the drawings, the present application is a complex low-grade copper-molybdenum-sulfur polymetallic ore branch step efficient recovery method, which specifically comprises the following steps: Figure 1

[0040] S1) A one-stage grinding treatment is performed on the complex low-grade copper-molybdenum-sulfur polymetallic ore to be treated to obtain a ground ore material;

[0041] S2) The ground ore material obtained in S1) is mixed with a collector and a frother, and after a first roughing, a first roughing concentrate and a first roughing tailing are obtained;

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

[0043] The column flotation tailing is subjected to one-time scavenging to obtain a first scavenging concentrate and a first scavenging tailing;

[0044] S3) The first roughing tailing in S2) is mixed with a collector and a frother, and after a second roughing, a second roughing concentrate and a second roughing tailing are obtained;

[0045] The second roughing tailing is subjected to two-time scavenging operations, and the scavenging concentrate is sequentially returned to the upper operation, and the scavenging tailing is the final tailing;

[0046] ​The second roughing concentrate is subjected to pre-classification treatment to obtain first undersize and first oversize; the first oversize is subjected to two-stage grinding treatment to obtain ground material;

[0047] The ground material is subjected to inspection classification treatment to obtain second oversize and second undersize; the second oversize is returned to the two-stage grinding treatment;

[0048] The second undersize is mixed with the first undersize to obtain mixed material; the mixed material is adjusted in concentration and pH and then fed to 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 one-stage roughing, two-stage cleaning and two-stage scavenging step-by-step recovery operation to obtain copper concentrate and two-stage tailings.

[0050] Embodiment 1

[0051] In some embodiments of the present application, a branched 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 one-stage grinding treatment to obtain ground material; the proportion of particles with a particle size of less than 0.074 mm in the ground material is 65%, the pulp concentration is adjusted to 33%, and the branched two-stage roughing operation is fed, the grinding concentration is 75%, the medium filling rate is 30%, and the proportion of -0.074 mm particle size material in the grinding product is 65%.

[0053] S2, the pulp in S1 is mixed with a collector and a foaming agent and subjected to first roughing, then lime is added to adjust the pH to 8, the amount of collector added is 15 g / t, to obtain first roughing concentrate and first roughing tailings; the first roughing concentrate is subjected to one-stage rapid column flotation by a flotation column to obtain copper-molybdenum mixed concentrate and column flotation tailings; the column flotation tailings are subjected to one-stage scavenging to obtain first scavenging concentrate and first scavenging tailings;

[0054] The main component of the collector is ethyl thiocarbamic acid ester, and the amount added is 15 g / t;

[0055] The composite 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) with a mass ratio of 1-15:2-5:1-5.

[0056] S3, the first roughing tailings described 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 subjected to a pre-classification treatment to obtain a first undersize and a first oversize; the first oversize is subjected to a two-stage grinding operation, with a grinding concentration of 54% and a medium filling rate of 25%, to obtain a ground material; the ground material is subjected to an inspection classification treatment to obtain a second oversize and a second undersize; the second oversize is returned for the two-stage grinding operation; the second undersize is mixed with the first undersize to obtain a mixed material; and the mixed material is subjected to a copper-sulfur separation flotation operation after adjusting the concentration and pH of the mixed material.

[0057] The collector mainly comprises sodium n-butyl xanthate, and the addition amount is 50 g / t.

[0058] S4, the mixed material in S3 is added to lime to adjust the pH to 8, mixed with a composite depressant and a collector, and subjected to a one-stage roughing, two-stage cleaning and two-stage scavenging step-by-step recovery operation to obtain a copper concentrate and a two-stage tailings;

[0059] The composite depressant is a mixture of 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 11:3:4; and the collector mainly comprises sodium n-butyl xanthate.

[0060] In the one-stage roughing, the addition amount of the composite depressant is 25 g / t, and the addition amount of the collector is 5 g / t; in the two-stage cleaning, the addition amount of the composite depressant is 12.5 g / t; and in the two-stage scavenging, the addition amount of the collector is 5 g / t.

[0061] Example 2

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

[0063] S1, a one-stage grinding operation is performed on the raw ore to obtain a ground material; the proportion of particles with a particle size of less than 0.074 mm in the ground material is 68%, the pulp concentration is adjusted to 28%, and the ground material is branched to two-stage roughing operations, with a grinding concentration of 77% and a medium filling rate of 32%.

[0064] S2, after the pulp in S1 is mixed with a collector and a frother and is subjected to first roughing, lime is added to adjust the pH to 8, the collector is added in an amount of 12 g / t, first roughing concentrate and first roughing tailings are obtained; the first roughing concentrate is subjected to one-time rapid column flotation by a flotation column, copper-molybdenum mixed concentrate and column flotation tailings are obtained; the column flotation tailings are subjected to one-time scavenging, first scavenging concentrate and first scavenging tailings are obtained;

[0065] The collector is ethyl thiocarbamate, and the collector is added in an amount of 12 g / t.

[0066] S3, the first roughing tailings in S2 are mixed with a collector and subjected to second roughing, second roughing concentrate and second roughing tailings are obtained; the second roughing tailings are subjected to two-time scavenging operations, the scavenging concentrate is sequentially returned to the upper operation, and the scavenging tailings are the final tailings; the second roughing concentrate in the two pulp streams is subjected to pre-classification treatment, first undersize and first oversize are obtained; the first oversize is subjected to two-stage grinding, the grinding concentration is 55%, the medium filling rate is 30%, and the ground material is obtained; the ground material is subjected to inspection classification treatment, second oversize and second undersize are obtained; the second oversize is returned for two-stage grinding; the second undersize is mixed with the first undersize, and the mixed material is obtained; the mixed material is adjusted in concentration and pH, and is fed into copper-sulfur separation flotation operation.

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

[0068] S4, the mixed material in S3 is mixed with a composite depressant and a collector when the pH is adjusted to 8 by adding lime, and is subjected to one-time roughing, two-time cleaning and two-time scavenging step recovery operation, copper concentrate and two-stage tailings are obtained.

[0069] The composite depressant is a mixture of 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 15:5:3; the main component of the collector is sodium n-butyl xanthate.

[0070] In the process of one-time roughing, the addition amount of the composite depressant is 20 g / t, and the addition amount of the collector is 3 g / t. In the process of two-time cleaning, the addition amount of the composite depressant is 10 g / t. In the process of two-time scavenging, the addition amount of the collector sodium n-butyl xanthate is 3 g / t.

[0071] Example 3

[0072] Provided in some embodiments of the present application is a complex low-grade copper-molybdenum-sulfur multi-metal ore branch stepwise efficient recovery method, comprising the following steps:

[0073] S1, a primary grinding treatment is performed on the raw ore to obtain a ground ore material; the proportion of particles with a particle size of less than 0.074 mm in the ground ore material is 70 wt%, the pulp concentration is adjusted to 30%, and the ground ore material is branched to two-stage roughing operations; the grinding concentration is 76%, and the medium filling rate is 33%.

[0074] S2, after the pulp in S1 is mixed with a collector and a frother and subjected to a first roughing, a compound inhibitor and a collector are added after the pH is adjusted to 7 by adding lime, and the collector is added in an amount of 10 g / t, to obtain a first roughing concentrate and a first roughing tailing; the first roughing concentrate is subjected to one-time 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 one-time scavenging to obtain a first scavenging concentrate and a first scavenging tailing;

[0075] The collector is ethyl thiocarbamate, and the collector is added in an amount of 10 g / t.

[0076] S3, the first roughing tailing in S2 is mixed with a collector to perform a second roughing to obtain a second roughing concentrate and a second roughing tailing; the second roughing tailing is subjected to two-time scavenging operations, the scavenging concentrates are sequentially returned to the upper operations, and the scavenging tailings are the final tailings; the second roughing concentrate in the two pulp streams is subjected to pre-classification to obtain a first undersize and a first oversize; the first oversize is subjected to a two-stage grinding treatment, the grinding concentration is 55%, and the medium filling rate is 30% to obtain a ground material; the ground material is subjected to inspection classification to obtain a second oversize and a second undersize; the second oversize is returned to the two-stage grinding treatment; the second undersize is mixed with the first undersize to obtain a mixed material; the concentration and the pH of the mixed material are adjusted, and the mixed material is fed to a copper-sulfur separation flotation operation;

[0077] The main component of the collector is sodium n-butyl xanthate, and the amount added is 40 g / t.

[0078] S4, the mixed material in S3 is mixed with a compound inhibitor and a collector to perform one-time roughing, two-time cleaning, and two-time scavenging stepwise recovery operations when the pH is adjusted to 8 by adding lime to obtain a copper concentrate and a two-stage tailing.

[0079] The compound 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) with a mass ratio of 7:5:5; and the main component of the collector is sodium n-butyl xanthate.

[0080] In the process of the first roughing, the inhibitor KDY-2 is added in an amount of 15 g / t, and the collector sodium n-butyl xanthate is added in an amount of 2 g / t. In the process of the second roughing, the inhibitor is added in an amount of 5 g / t. In the process of the second scavenging, the collector sodium n-butyl xanthate is added in an amount of 3 g / t.

[0081] Comparative Example 1

[0082] In some embodiments of the present application, a complex low-grade copper-molybdenum-sulfur multi-metal ore branch stepwise efficient recovery method is provided, comprising the following steps:

[0083] S1, a one-stage grinding treatment is performed on the raw ore to obtain a ground ore material; the proportion of particles with a particle size of less than 0.074 mm in the ground ore material is 70 wt%, and the pulp concentration is adjusted to 30% for branch feeding into two-stage roughing operations; the grinding concentration is 76%, and the medium filling rate is 33%.

[0084] S2, after the pulp in S1 is mixed with a collector and a frother and subjected to first roughing, lime is added to adjust the pH to 7, and the collector is added in an amount of 10 g / t to obtain a first roughing concentrate and a first roughing tailing; the first roughing concentrate is subjected to one-stage 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 one-stage scavenging to obtain a first scavenging concentrate and a first scavenging tailing; the first roughing tailing is subjected to second roughing to obtain a second roughing concentrate and a second roughing tailing; the second roughing tailing is subjected to two-stage scavenging operations, and the scavenging concentrates are sequentially returned to the upper-stage operations, and the scavenging tailings are the final tailings;

[0085] The collector is t-butyl xanthate, and the collector is added in an amount of 10 g / t;

[0086] S3, the second roughing concentrate in the two branch pulp streams is subjected to pre-classification treatment to obtain a first undersize and a first oversize; the first oversize is subjected to two-stage grinding treatment, the grinding concentration is 55%, and the medium filling rate is 30% to obtain a ground material; the ground material is subjected to inspection classification treatment to obtain a second oversize and a second undersize; the second oversize is returned for two-stage grinding treatment; the second undersize is mixed with the first undersize to obtain a mixed material; the concentration and the pH of the mixed material are adjusted, and the mixed material is fed into copper-sulfur separation flotation operations;

[0087] S4, when the mixed material in S3 is added with lime to adjust the pH to 8, one-stage roughing, two-stage cleaning, and two-stage scavenging stepwise recovery operations are performed to obtain a copper concentrate and a two-stage tailing;

[0088] The adding amount of the inhibitor lime is 2000 g / t, and the adding amount of the collector sodium n-butyl xanthate is 40 g / t in the process of the first roughing. The adding amount of the inhibitor lime is 500 g / t in the process of the second cleaning. The adding amount of the collector sodium n-butyl xanthate is 8 g / t in the process of the second scavenging.

[0089] Comparative Example 2

[0090] In some embodiments of the present application, a complex low-grade copper-molybdenum-sulfur multi-metal ore branch stepwise efficient recovery method is provided, comprising the following steps:

[0091] S1, a one-stage grinding treatment is performed on the raw ore to obtain a ground ore material; the proportion of particles with a particle size of less than 0.074 mm in the ground ore material is 65%, and the pulp concentration is adjusted to 28% to branch into two-stage roughing operations; the grinding concentration is 75%, and the medium filling rate is 30%.

[0092] S2, after the pulp in S1 is mixed with a collector and a frother and subjected to first roughing, lime is added to adjust the pH to 8, and the adding amount of the collector is 15 g / t, to obtain a first roughing concentrate and a first roughing tailing; the first roughing concentrate is subjected to one-stage 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 one-stage scavenging to obtain a first scavenging concentrate and a first scavenging tailing; the first roughing tailing is subjected to second roughing to obtain a second roughing concentrate and a second roughing tailing; the second roughing tailing is subjected to two-stage scavenging operations, and the scavenging concentrates are sequentially returned to the upper-stage operation, and the scavenging tailings are the final tailings;

[0093] The collector is butyl xanthate, and the adding amount of the collector is 15 g / t;

[0094] S3, the second roughing concentrate in the two branch pulp streams is subjected to pre-classification treatment to obtain a first undersize and a first oversize; the first oversize is subjected to two-stage grinding treatment, the grinding concentration is 50%, and the medium filling rate is 28% to obtain a ground material; the ground material is subjected to inspection classification treatment to obtain a second oversize and a second undersize; the second oversize is returned for two-stage grinding treatment; the second undersize is mixed with the first undersize to obtain a mixed material; the concentration and the pH of the mixed material are adjusted and then fed into a copper-sulfur separation flotation operation;

[0095] S4, when the mixed material in S3 is added with lime to adjust the pH to 13, one-stage roughing, two-stage cleaning and two-stage scavenging stepwise recovery operations are performed to obtain a copper concentrate and a two-stage tailing;

[0096] The adding amount of the depressor lime is 2100 g / t, and the adding amount of the collector sodium n-butyl xanthate is 40 g / t in the primary roughing process. The adding amount of the depressor lime is 800 g / t in the secondary roughing process. The adding amount of the collector sodium n-butyl xanthate is 15 g / t in the secondary scavenging process.

[0097] Comparative Example 3

[0098] In some embodiments of the present application, a complex low-grade copper-molybdenum-sulfur multi-metal ore branch stepwise efficient recovery method is provided, comprising the following steps:

[0099] S1, a primary grinding treatment is performed on the raw ore to obtain a ground ore material; the proportion of particles with a particle size of less than 0.074 mm in the ground ore material is 70 wt%, and the pulp concentration is adjusted to 30% for branch feeding into two-stage roughing operations; the grinding concentration is 76%, and the medium filling rate is 33%.

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

[0101] The collector is sodium n-butyl xanthate, and the adding amount of the collector is 15 g / t;

[0102] S3, the second roughing concentrate in the two branch pulp streams is subjected to a pre-classification treatment to obtain a first undersize and a first oversize; the first oversize is subjected to a two-stage grinding treatment, the grinding concentration is 50%, and the medium filling rate is 24% to obtain a ground material; the ground material is subjected to an inspection classification treatment to obtain a second oversize and a second undersize; the second oversize is returned for two-stage grinding treatment; the second undersize is mixed with the first undersize to obtain a mixed material; the concentration and the pH of the mixed material are adjusted and fed into a copper-sulfur separation flotation operation;

[0103] S4, when the mixed material in S3 is added with lime to adjust the pH to 13, a one-time roughing, two-time cleaning and two-time scavenging stepwise recovery operation is performed to obtain a copper concentrate and a two-stage tailings;

[0104] The adding amount of the depressor lime is 24000g / t, and the adding amount of the collector sodium n-butyl xanthate is 30g / t in the primary roughing process. The adding amount of the depressor lime is 3000g / t in the secondary cleaning process. The adding amount of the collector sodium n-butyl xanthate is 5g / t in the secondary scavenging process.

[0105] The detailed recovery rate data is shown in Table 1, and the valuable metal recovery rate can be obviously improved by using the method.

[0106]

[0107] The above provides a kind of complex low-grade copper-molybdenum-sulfur multi-metal ore branch step efficient recovery method provided by the embodiment of the application, which is described in detail.The above embodiment is only used to help understand the method and its core idea of the application;Meanwhile, for those skilled in the art, according to the idea of the application, the specific embodiment and application range will be changed, and the content of the description should not be understood as limiting the application.

[0108] As some terms are used in the description and claims to refer to certain components. Those skilled in the art should understand that hardware manufacturers may use different names to refer to the same component. The description and claims of the present application do not distinguish components by name, but by the functional difference between components. As mentioned throughout the description and claims, "including" and "including" are open-ended terms, which should be interpreted as "including / including but not limited to". "Approximately" means within an acceptable error range, and 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 application, which is intended to illustrate the general principles of the application, but not to limit the scope of the application. The scope of protection of the application is defined by the appended claims.

[0109] It should also be noted that the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the goods or systems including a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such goods or systems. Without more limitations, the element defined by the sentence "including a…" does not exclude the presence of other identical elements in the goods or systems including the element.

[0110] It should be understood that the term "and / or" as used herein merely describes associated objects, and can exist in three forms: A and / or B, A or B, and A and B. In addition, the character " / " as used herein generally represents an "or" relationship between the front and rear associated objects.

[0111] The above specification, shows and describes the application in connection with certain preferred embodiments, however, as mentioned above, it will be understood that the application is not limited to the disclosed forms, but rather, can be used in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be applied in various other combinations, modifications, and environments, and can be

Claims

1. A method for efficient stepwise recovery of complex, low-grade copper-molybdenum-sulfur polymetallic ores, characterized in that, The recycling method specifically includes the following steps: S1) The complex low-grade copper-molybdenum-sulfur polymetallic ore to be processed is subjected to a first-stage grinding process to obtain ground ore material; S2) The ground ore obtained in S1) is mixed with a collector and a frother and then subjected to a first roughing process to obtain a first roughing concentrate and a first roughing tailings. The first rougher concentrate is mixed with the composite inhibitor and subjected to one rapid column flotation in a flotation column to obtain a copper-molybdenum mixed concentrate and column flotation tailings. The column flotation tailings are subjected to a first scavenging process to obtain a first scavenging concentrate and a first scavenging tailings. The first roughing process in S2) specifically refers to: The ground mineral material is slurried, and lime is added to adjust the pH to 7-8. After adding a collector and a frother, a roughing process is carried out to obtain the first roughing concentrate and the first roughing tailings. The amount of the collector added is 12-15 g / t; the amount of the foaming agent added is 10-13 g / t. The mixing ratio of the first roughing concentrate to the composite inhibitor is 1250~3200:1; The composite inhibitor is a mixture of polyaniline lignin, hydroxypropyl starch ether and hydroxyethyl starch in a mass ratio of 1-15:2-5:1-5. The collector is ethyl thiocarbamate; S3) The first roughing tailings obtained in S2) are mixed with collector and frother and then subjected to a second roughing to obtain the second roughing concentrate and the second roughing tailings. The second roughing tailings are subjected to two scavenging operations, and the scavenged concentrate is returned to the previous operation in sequence. The scavenged tailings are the final tailings. The second roughing concentrate is pre-classified to obtain the first undersize and the first oversize; the first oversize is then subjected to two-stage grinding to obtain the ground material. The material after grinding is inspected and classified to obtain the second screen oversize and the second screen undersize; the second screen oversize is returned for two-stage grinding. The second undersize is mixed with the first undersize to obtain a mixture; the concentration and pH of the mixture are adjusted before it is fed into the copper-sulfur separation flotation operation. S4) The mixture in S3) is mixed with the composite inhibitor and collector and then subjected to a stepwise recovery operation of one roughing, two cleaning and two scavenging to obtain copper concentrate and two tailings.

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

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

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

5. The recycling method according to claim 4, characterized in that, During the first roughing process, the amount of the compound inhibitor added is 5-25 g / t, and the amount of the collector added is 2-5 g / t. The amount of compound inhibitor added during the secondary selection process is 5~12.5g / t; The amount of collector added during the secondary scavenging process is 2~5g / t.

6. The recycling method according to claim 3, characterized in that, The collector is one or more of sodium n-butyl xanthate, ethyl isobutyl xanthate, and sodium thiocarbamate.

7. The recycling method according to claim 1, characterized in that, The copper recovery rate of the described recycling method is over 88%, and the molybdenum recovery rate is over 67%.

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