Flotation separation method for copper-molybdenum mixed flotation concentrate

Abstract

The invention discloses a flotation separation method for copper-molybdenum mixed flotation concentrate. The flotation separation method for the copper-molybdenum mixed flotation concentrate comprises the following steps that S1, after the copper-molybdenum mixed flotation concentrate is concentrated through a thickener, the copper-molybdenum mixed flotation concentrate overflows into a water treatment system, underflow is subjected to one-time roughing, one-time concentration and one-time scavenging operation, and first-section copper concentrate and copper-molybdenum concentrate are obtained; s2, after the copper-molybdenum concentrate is subjected to concentration operation, underflow is fed into a grinding machine, and stirring and ore grinding treatment is conducted; s3, the stirring and ore grinding product in the S2 is subjected to three-time concentration operation and two-time scavenging operation, and final molybdenum concentrate and second-stage copper concentrate are obtained; the copper and molybdenum separation inhibitor is prepared from tetramethyl thiouracil, thiohydantoin, chloracetate, tributyl phosphonate and polyethylene glycol. According to the method, the newly prepared chalcopyrite inhibitor can completely replace sodium sulfide, the recovery rate of molybdenum reaches 80% or above, the recovery rate of copper reaches 99% or above, and efficient separation of the copper-molybdenum mixed flotation concentrate is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a flotation separation method for copper-molybdenum mixed flotation concentrate. Background Art

[0002] Flotation is a common process for separating copper and molybdenum. Usually, mixed flotation is carried out first by taking advantage of the good floatability of copper and molybdenum sulfides, and then copper and molybdenum separation operations are carried out. This method can obtain concentrates with higher grades and recovery rates. However, due to the addition of a large amount of xanthate as a collector in the mixed flotation stage, there are challenges in suppressing chalcopyrite. At present, a large amount of sodium sulfide needs to be added during the flotation process of copper and molybdenum separation. The amount must be at least 25kg / t, and sometimes even 40-60kg / t to meet the separation requirements of copper-molybdenum mixed concentrates. The cost of sodium sulfide accounts for about 60%-80% of the total cost of molybdenum selection, resulting in losses in molybdenum selection and even the inability to recover molybdenum.

[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 a copper-molybdenum mixed flotation concentrate, which is based on a new type of copper sulfide mineral flotation depressant, completely replacing the sodium sulfide in the copper-molybdenum separation process, thereby improving the recovery efficiency of valuable metals and reducing the recovery cost.

[0005] In order to achieve the above-mentioned purpose of the present invention, the following technical scheme is specially adopted: a flotation separation method of copper-molybdenum mixed flotation concentrate, the flotation separation method of copper-molybdenum mixed flotation concentrate specifically comprises the following steps:

[0006] S1) The copper-molybdenum mixed flotation concentrate is fed into a ￠30m thickener for concentration and drug removal, and the underflow of the thickener is fed into a flotation system for flotation separation to obtain underflow pulp;

[0007] S2) mixing the underflow slurry in S1) with a gangue mineral inhibitor, a chalcopyrite inhibitor, and a molybdenite collector successively, and then performing a roughing operation to obtain a roughing concentrate and a roughing tailings;

[0008] The rougher concentrate is subjected to primary concentration by a flotation machine to obtain a primary concentrated concentrate and a primary concentrated tailings;

[0009] The roughing tailings are fed into a flotation machine for a scavenging operation to obtain a scavenging concentrate and a copper concentrate; the first concentrating tailings and the first scavenging concentrate are returned to the roughing operation;

[0010] S3) feeding the primary concentrated ore obtained in S2) into a ￠20m thickener for thickening treatment, the overflow of the thickener returns to the circulating water system, and the underflow of the thickener is fed into a stirred mill for scrubbing;

[0011] S4) The underflow of the grinding mill is fed into the second concentration operation, the concentrate of the second concentration is fed into the third concentration operation, the concentrate of the third concentration is fed into the fourth concentration operation, and the concentrate of the fourth concentration is the final molybdenum concentrate; the tailings of the second concentration are fed into the scavenging operation, the scavenging concentrate returns to the second concentration operation, the scavenging tailings are fed into the third scavenging operation, the concentrate of the third scavenging returns to the ￠20m thickener, and the scavenging tailings are the second-stage copper concentrate.

[0012] Furthermore, the thickener underflow concentration in S1) is 50%-60%.

[0013] Further, the first roughing in S2) includes: subjecting the ground material to slurry treatment to adjust the slurry pH to 11-13;

[0014] The amount of gangue mineral inhibitor used in the roughing process is 200g / t to 300g / t, the amount of chalcopyrite inhibitor used is 2500g / t to 3500g / t, and the amount of molybdenite collector added is 100 to 140g / t;

[0015] In the first concentration operation, the amount of gangue mineral inhibitor is 150g / t to 200g / t, the amount of chalcopyrite inhibitor is 1000g / t to 2000g / t, and the amount of molybdenite collector added is 30 to 70g / t;

[0016] In the first sweeping operation, the amount of gangue mineral inhibitor used is 50g / t-150g / t, the amount of chalcopyrite inhibitor used is 600g / t-1000g / t, and the amount of molybdenite collector added is 10-30g / t.

[0017] Furthermore, the underflow concentration of the concentrator in S3) is 30%-40%, the grinding concentration of the stirred mill is 30%-40%, the medium filling rate is 20%-30%, and the grinding medium is steel balls and ceramic balls.

[0018] Further, in the second concentration in S4), the amount of gangue mineral inhibitor used is 150 g / t to 250 g / t, the amount of chalcopyrite inhibitor used is 800 g / t to 1200 g / t, and the amount of molybdenite collector added is 30 to 70 g / t;

[0019] In the third concentration, the amount of gangue mineral inhibitor is 100g / t-200g / t, the amount of chalcopyrite inhibitor is 800g / t-1200g / t, and the amount of molybdenite collector added is 30-70g / t;

[0020] In the fourth concentration, the amount of gangue mineral inhibitor used is 70g / t-170g / t, the amount of chalcopyrite inhibitor used is 600g / t-1000g / t, and the amount of molybdenite collector added is 20-40g / t.

[0021] Further, in the second scanning in S4), the amount of gangue mineral inhibitor used is 100g / t to 200g / t, the amount of chalcopyrite inhibitor used is 300g / t to 500g / t, and the amount of molybdenite collector added is 60 to 100g / t;

[0022] In the third scanning, the amount of gangue mineral inhibitor used is 80 g / t to 180 g / t, the amount of chalcopyrite inhibitor used is 400 g / t to 600 g / t, and the amount of molybdenite collector added is 40 to 60 g / t.

[0023] Furthermore, the molybdenite collector is a mixture of polymethoxy dimethyl ether, fatty acid ester and emulsifier, and the mass ratio of the three is 55-60:30-40:5-10.

[0024] Furthermore, the gangue mineral inhibitor is a mixture of water glass and sodium hexametaphosphate, and the mass ratio between the two is 1:1.

[0025] Furthermore, the chalcopyrite inhibitor is a mixture of tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate and polyethylene glycol, with a mass ratio of 15-20:25-30:20-30:18-25:12-15.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The novel chalcopyrite inhibitor and molybdenite collector provided by the present invention can effectively separate chalcopyrite and molybdenite in copper-molybdenum mixed flotation concentrate, and the preparation method is simple and the raw materials of the reagents are widely available. The usage of sodium sulfide is greatly reduced, and the cost of mineral processing is reduced.

[0028] The multi-stage concentrated drug removal and the continuous stirring and scrubbing method of the stirred mill can effectively clean the mineral surface, desorb the collector adsorbed on the surface of chalcopyrite, which is beneficial to the adsorption of new inhibitors and collectors and improves the separation efficiency of copper-molybdenum minerals. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a flow chart of a flotation separation method for a copper-molybdenum mixed flotation concentrate. DETAILED DESCRIPTION

[0030] 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.

[0031] In some embodiments of the present invention, a flotation separation method for a copper-molybdenum mixed flotation concentrate is provided, comprising the following steps:

[0032] like Figure 1 As shown, a flotation separation method for copper-molybdenum mixed flotation concentrate of the present invention comprises the following steps:

[0033] S1, copper-molybdenum mixed flotation concentrate is fed into the ￠30m thickener for concentration and drug removal, and the underflow of the thickener is fed into the flotation system for flotation separation;

[0034] S2, the underflow pulp in S1 is mixed with gangue mineral inhibitor, chalcopyrite inhibitor and molybdenite collector successively, and then a roughing operation is carried out to obtain a roughing concentrate and a roughing tailing; the roughing concentrate is subjected to a first concentration by a flotation machine to obtain a copper-molybdenum rough concentrate; the first roughing tailing is fed into a flotation machine for a first scavenging operation to obtain a scavenging concentrate and a copper concentrate; the first concentrated tailing and the first scavenging concentrate are returned to the roughing operation;

[0035] Wherein, the gangue mineral inhibitor is water glass and hexametazoline, the chalcopyrite inhibitor is tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate, polyethylene glycol, and the molybdenite collector is polymethoxy dimethyl ether, fatty acid ester, and emulsifier;

[0036] S3, feeding the selected concentrate into a ￠20m thickener for thickening treatment, the overflow of the thickener returns to the circulating water system, and the underflow of the thickener is fed into a stirred mill for scrubbing;

[0037] S4, the underflow of the grinding mill is fed into the second concentration operation, the concentrate of the second concentration is fed into the third concentration operation, the concentrate of the third concentration is fed into the fourth concentration operation, and the concentrate of the fourth concentration is the final molybdenum concentrate; the tailings of the second concentration are fed into the scavenging operation, the scavenging concentrate returns to the second concentration operation, the scavenging tailings are fed into the third scavenging operation, the concentrate of the third scavenging returns to the ￠20m thickener, and the scavenging tailings are the second-stage copper concentrate;

[0038] Wherein, the collector comprises polyoxymethylene dimethyl ether, fatty acid ester and emulsifier in a mass ratio of 55-60:30-40:5-10;

[0039] The inhibitor comprises tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate and polyethylene glycol in a mass ratio of 15-20:25-30:20-30:18-25:12-15.

[0040] Furthermore, in step S1, the underflow concentration of the thickener of the first stage flotation feed is 50% to 60%.

[0041] Furthermore, in step S2, the first roughing includes: slurrying the first stage flotation feed, adding gangue mineral inhibitors and chalcopyrite inhibitors to adjust the pH to 11-13, adding a collector and performing a roughing, to obtain the roughing concentrate and the roughing tailings.

[0042] Furthermore, step S2 should include one of the following (1) to (5):

[0043] (1) In the roughing process, the amount of gangue mineral inhibitor used is 200 g / t to 300 g / t, the amount of chalcopyrite inhibitor used is 2500 g / t to 3500 g / t, and the amount of molybdenite collector added is 100 to 140 g / t.

[0044] (2) In the first concentration operation, the amount of gangue mineral inhibitor used is 150 g / t to 200 g / t, the amount of chalcopyrite inhibitor used is 1000 g / t to 2000 g / t, and the amount of molybdenite collector added is 30 to 70 g / t.

[0045] (3) In the first scavenging operation, the amount of gangue mineral inhibitor used is 50 g / t to 150 g / t, the amount of chalcopyrite inhibitor used is 600 g / t to 1000 g / t, and the amount of molybdenite collector added is 10 to 30 g / t.

[0046] Furthermore, in step S3, the underflow concentration of the concentrator is 30%-40%, the grinding concentration of the stirred mill is 30%-40%, the medium filling rate is 20%-30%, and the grinding medium is steel balls and ceramic balls.

[0047] Furthermore, in step S4, the amount of gangue mineral inhibitor used in the second concentration is 150 g / t to 250 g / t, the amount of chalcopyrite inhibitor used is 800 g / t to 1200 g / t, and the amount of molybdenite collector added is 30 to 70 g / t.

[0048] Furthermore, in step S4, the amount of gangue mineral inhibitor used in the third concentration is 100 g / t to 200 g / t, the amount of chalcopyrite inhibitor used is 800 g / t to 1200 g / t, and the amount of molybdenite collector added is 30 to 70 g / t.

[0049] Furthermore, in step S4, the amount of gangue mineral inhibitor used in the fourth concentration is 70 g / t to 170 g / t, the amount of chalcopyrite inhibitor used is 600 g / t to 1000 g / t, and the amount of molybdenite collector added is 20 to 40 g / t.

[0050] Furthermore, in step S4, the amount of gangue mineral inhibitor used in the second scanning is 100 g / t to 200 g / t, the amount of chalcopyrite inhibitor used is 300 g / t to 500 g / t, and the amount of molybdenite collector added is 60 to 100 g / t.

[0051] Furthermore, in step S4, the amount of gangue mineral inhibitor used in the third scanning is 80 g / t to 180 g / t, the amount of chalcopyrite inhibitor used is 400 g / t to 600 g / t, and the amount of molybdenite collector added is 40 to 60 g / t.

[0052] Example 1

[0053] S1, copper-molybdenum mixed flotation concentrate is fed into the ￠30m thickener for concentration and drug removal, and the underflow of the thickener is fed into the flotation system for flotation separation. The underflow concentration of the thickener is 60%;

[0054] S2, after successively mixing the underflow pulp in S1 with the gangue mineral inhibitor, chalcopyrite inhibitor and molybdenite collector, adjusting the pulp pH to 11-13, and performing a roughing operation. Obtain a roughing concentrate and a roughing tailing; the roughing concentrate is subjected to a first concentration by a flotation machine to obtain a copper-molybdenum rough concentrate; the first roughing tailing is fed into a flotation machine for a first scavenging operation to obtain a scavenging concentrate and a copper concentrate; the first concentrated tailing and the first scavenging concentrate are returned to the roughing operation;

[0055] In the roughing process, the mass ratio of gangue mineral inhibitor water glass and sodium hexametaphosphate is 1:1, and the dosage is 300 g / t; the mass ratio of chalcopyrite inhibitor tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate, and polyethylene glycol is 20:25:20:18:17, and the dosage is 3500 g / t; the mass ratio of molybdenite collector polymethoxydimethyl ether, fatty acid ester, and emulsifier is 55:30:15, and the dosage of the agent is 140 g / t.

[0056] In the first concentration operation, the amount of gangue mineral inhibitor used is 200 g / t, the amount of chalcopyrite inhibitor used is 2000 g / t, and the amount of molybdenite collector added is 70 g / t.

[0057] In the first sweeping operation, the amount of gangue mineral inhibitor used is 150 g / t, the amount of chalcopyrite inhibitor used is 1000 g / t, and the amount of molybdenite collector added is 30 g / t.

[0058] S3, feeding the selected concentrate into a ￠20m thickener for thickening treatment, the underflow concentration of the thickener is 40%, the overflow of the thickener is returned to the circulating water system, the underflow of the thickener is fed into a stirred mill, the grinding concentration of the stirred mill is 40%, the medium filling rate is 30%, and the grinding medium is steel balls;

[0059] S4, the underflow of the grinding mill is fed into the second concentration operation, the concentrate of the second concentration is fed into the third concentration operation, the concentrate of the third concentration is fed into the fourth concentration operation, and the concentrate of the fourth concentration is the final molybdenum concentrate; the tailings of the second concentration are fed into the scavenging operation, the scavenging concentrate returns to the second concentration operation, the scavenging tailings are fed into the third scavenging operation, the concentrate of the third scavenging returns to the ￠20m thickener, and the scavenging tailings are the second-stage copper concentrate;

[0060] In the second concentration, the amount of gangue mineral inhibitor used is 250 g / t, the amount of chalcopyrite inhibitor used is 1200 g / t, and the amount of molybdenite collector added is 70 g / t.

[0061] In the third concentration, the amount of gangue mineral inhibitor used is 200 g / t, the amount of chalcopyrite inhibitor used is 800 g / t, and the amount of molybdenite collector added is 60 g / t.

[0062] In the fourth concentration, the amount of gangue mineral inhibitor used is 70 g / t, the amount of chalcopyrite inhibitor used is 600 g / t, and the amount of molybdenite collector added is 20 g / t.

[0063] In the second scanning, the amount of gangue mineral inhibitor used is 200 g / t, the amount of chalcopyrite inhibitor used is 500 g / t, and the amount of molybdenite collector added is 100 g / t.

[0064] In the third scanning, the amount of gangue mineral inhibitor used is 80 g / t, the amount of chalcopyrite inhibitor used is 400 g / t, and the amount of molybdenite collector added is 40 g / t.

[0065] Example 2

[0066] S1, copper-molybdenum mixed flotation concentrate is fed into the ￠30m thickener for concentration and drug removal, and the underflow of the thickener is fed into the flotation system for flotation separation. The underflow concentration of the thickener is 54%;

[0067] S2, after successively mixing the underflow pulp in S1 with the gangue mineral inhibitor, chalcopyrite inhibitor and molybdenite collector, adjusting the pulp pH to 12, and performing a roughing operation. Obtain a roughing concentrate and a roughing tailing; the roughing concentrate is subjected to a first concentration by a flotation machine to obtain a copper-molybdenum rough concentrate; the first roughing tailing is fed into a flotation machine for a first scavenging operation to obtain a scavenging concentrate and a copper concentrate; the first concentrated tailing and the first scavenging concentrate are returned to the roughing operation;

[0068] In the roughing process, the mass ratio of gangue mineral inhibitors water glass and sodium hexametaphosphate is 1:2, and the dosage is 250 g / t; the mass ratio of chalcopyrite inhibitors tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate, and polyethylene glycol is 15:30:20:18:17, and the dosage is 3200 g / t; the mass ratio of molybdenite collectors polymethoxydimethyl ether, fatty acid ester, and emulsifier is 55:30:15, and the dosage of the agent is 100 g / t.

[0069] In the first concentration operation, the amount of gangue mineral inhibitor used is 170 g / t, the amount of chalcopyrite inhibitor used is 1200 g / t, and the amount of molybdenite collector added is 65 g / t.

[0070] In the first sweeping operation, the amount of gangue mineral inhibitor used is 100 g / t, the amount of chalcopyrite inhibitor used is 600 g / t, and the amount of molybdenite collector added is 15 g / t.

[0071] S3, feeding the selected concentrate into a ￠20m thickener for thickening treatment, the underflow concentration of the thickener is 35%, the overflow of the thickener is returned to the circulating water system, the underflow of the thickener is fed into a stirred mill, the grinding concentration of the stirred mill is 40%, the medium filling rate is 25%, and the grinding medium is ceramic balls;

[0072] S4, the underflow of the grinding mill is fed into the second concentration operation, the concentrate of the second concentration is fed into the third concentration operation, the concentrate of the third concentration is fed into the fourth concentration operation, and the concentrate of the fourth concentration is the final molybdenum concentrate; the tailings of the second concentration are fed into the scavenging operation, the scavenging concentrate returns to the second concentration operation, the scavenging tailings are fed into the third scavenging operation, the concentrate of the third scavenging returns to the ￠20m thickener, and the scavenging tailings are the second-stage copper concentrate;

[0073] In the second concentration, the amount of gangue mineral inhibitor used is 220 g / t, the amount of chalcopyrite inhibitor used is 1000 g / t, and the amount of molybdenite collector added is 35 g / t.

[0074] In the third concentration, the amount of gangue mineral inhibitor used is 150 g / t, the amount of chalcopyrite inhibitor used is 900 g / t, and the amount of molybdenite collector added is 50 g / t.

[0075] In the fourth concentration, the amount of gangue mineral inhibitor used is 70 g / t, the amount of chalcopyrite inhibitor used is 600 g / t, and the amount of molybdenite collector added is 20 g / t.

[0076] In the second scanning, the amount of gangue mineral inhibitor used is 100 g / t, the amount of chalcopyrite inhibitor used is 300 g / t, and the amount of molybdenite collector added is 100 g / t.

[0077] In the third scanning, the amount of gangue mineral inhibitor used is 80 g / t, the amount of chalcopyrite inhibitor used is 400 g / t, and the amount of molybdenite collector added is 40 g / t.

[0078] Example 3

[0079] S1, copper-molybdenum mixed flotation concentrate is fed into the ￠30m thickener for concentration and drug removal, and the underflow of the thickener is fed into the flotation system for flotation separation. The underflow concentration of the thickener is 58%;

[0080] S2, after successively mixing the underflow pulp in S1 with the gangue mineral inhibitor, chalcopyrite inhibitor and molybdenite collector, adjusting the pulp pH to 12, and performing a roughing operation. Obtain a roughing concentrate and a roughing tailing; the roughing concentrate is subjected to a first concentration by a flotation machine to obtain a copper-molybdenum rough concentrate; the first roughing tailing is fed into a flotation machine for a first scavenging operation to obtain a scavenging concentrate and a copper concentrate; the first concentrated tailing and the first scavenging concentrate are returned to the roughing operation;

[0081] In the roughing process, the mass ratio of gangue mineral inhibitor water glass and sodium hexametaphosphate is 1:2, and the dosage is 220 g / t; the mass ratio of chalcopyrite inhibitor tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate, and polyethylene glycol is 16:25:20:25:14, and the dosage is 3100 g / t; the mass ratio of molybdenite collector polymethoxydimethyl ether, fatty acid ester, and emulsifier is 60:30:10, and the dosage of the agent is 115 g / t.

[0082] In the first concentration operation, the amount of gangue mineral inhibitor used is 150 g / t, the amount of chalcopyrite inhibitor used is 1650 g / t, and the amount of molybdenite collector added is 45 g / t.

[0083] In the first sweeping operation, the amount of gangue mineral inhibitor used was 85 g / t, the amount of chalcopyrite inhibitor used was 850 g / t, and the amount of molybdenite collector added was 17 g / t.

[0084] S3, feeding the selected concentrate into a ￠20m thickener for thickening treatment, the underflow concentration of the thickener is 35%, the overflow of the thickener is returned to the circulating water system, and the underflow of the thickener is fed into a stirred mill, the grinding concentration of the stirred mill is 32%, the medium filling rate is 28%, and the grinding medium is ceramic balls;

[0085] S4, the underflow of the grinding mill is fed into the second concentration operation, the concentrate of the second concentration is fed into the third concentration operation, the concentrate of the third concentration is fed into the fourth concentration operation, and the concentrate of the fourth concentration is the final molybdenum concentrate; the tailings of the second concentration are fed into the scavenging operation, the scavenging concentrate returns to the second concentration operation, the scavenging tailings are fed into the third scavenging operation, the concentrate of the third scavenging returns to the ￠20m thickener, and the scavenging tailings are the second-stage copper concentrate;

[0086] In the second concentration, the amount of gangue mineral inhibitor used is 200 g / t, the amount of chalcopyrite inhibitor used is 1000 g / t, and the amount of molybdenite collector added is 50 g / t.

[0087] In the third concentration, the amount of gangue mineral inhibitor used is 145 g / t, the amount of chalcopyrite inhibitor used is 980 g / t, and the amount of molybdenite collector added is 45 g / t.

[0088] In the fourth concentration, the amount of gangue mineral inhibitor used is 75 g / t, the amount of chalcopyrite inhibitor used is 850 g / t, and the amount of molybdenite collector added is 25 g / t.

[0089] In the second scanning, the amount of gangue mineral inhibitor used is 150 g / t, the amount of chalcopyrite inhibitor used is 350 g / t, and the amount of molybdenite collector added is 40 g / t.

[0090] In the third scanning, the amount of gangue mineral inhibitor used is 150 g / t, the amount of chalcopyrite inhibitor used is 350 g / t, and the amount of molybdenite collector added is 85 g / t.

[0091] Example 4

[0092] The flotation separation method of copper-molybdenum mixed flotation concentrate provided in this embodiment refers to Example 1, except that in step S2, the mass ratio of the collector polymethoxydimethyl ether, fatty acid ester, and emulsifier is 57:33:10.

[0093] Example 5

[0094] The flotation separation method of copper-molybdenum mixed flotation concentrate provided in this embodiment refers to Example 1, except that, in step S2, the ratio of inhibitors tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate, and polyethylene glycol is 17:25:24:20:14.

[0095] Comparative Example 1

[0096] The flotation separation method of the copper-molybdenum mixed flotation concentrate provided in this comparative example refers to Example 1, except that in step S2, the inhibitor is sodium sulfide.

[0097] Comparative Example 2

[0098] The flotation separation method of the copper-molybdenum mixed flotation concentrate provided in this comparative example refers to Example 1, except that in step S2, the inhibitor is tetramethylthiouracil.

[0099] Comparative Example 3

[0100] The flotation separation method of the copper-molybdenum mixed flotation concentrate provided in this comparative example refers to Example 1, except that in step S2, the inhibitor is thiohydantoin.

[0101] Comparative Example 4

[0102] The flotation separation method of the copper-molybdenum mixed flotation concentrate provided in this comparative example refers to Example 1, except that in step S2, the inhibitor is chloroacetate.

[0103] Test Example 1

[0104] In the flotation separation method of the copper-molybdenum mixed flotation concentrate in Examples 1 to 5 and Comparative Examples 1 to 4, the recovery rate and average grade of molybdenum are shown in Table 1.

[0105]

[0106] It is only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. A flotation separation method for copper-molybdenum mixed flotation concentrate, characterized in that: The flotation separation method of the copper-molybdenum mixed flotation concentrate specifically comprises the following steps: S1) The copper-molybdenum mixed flotation concentrate is fed into a ￠30m thickener for concentration and drug removal, and the underflow of the thickener is fed into a flotation system for flotation separation to obtain underflow pulp; S2) mixing the underflow slurry in S1) with a gangue mineral inhibitor, a chalcopyrite inhibitor, and a molybdenite collector successively, and then performing a roughing operation to obtain a roughing concentrate and a roughing tailing; The rougher concentrate is subjected to primary concentration by a flotation machine to obtain a primary concentrated concentrate and a primary concentrated tailings; The roughing tailings are fed into a flotation machine for a scavenging operation to obtain a scavenging concentrate and a copper concentrate; the first concentrating tailings and the first scavenging concentrate are returned to the roughing operation; S3) feeding the primary concentrated ore obtained in S2) into a ￠20m thickener for thickening treatment, the overflow of the thickener returns to the circulating water system, and the underflow of the thickener is fed into a stirred mill for scrubbing; S4) The underflow of the grinding mill is fed into the second concentration operation, the concentrate of the second concentration is fed into the third concentration operation, the concentrate of the third concentration is fed into the fourth concentration operation, and the concentrate of the fourth concentration is the final molybdenum concentrate; the tailings of the second concentration are fed into the scavenging operation, the scavenging concentrate returns to the second concentration operation, the scavenging tailings are fed into the third scavenging operation, the concentrate of the third scavenging returns to the ￠20m thickener, and the scavenging tailings are the second-stage copper concentrate.

2. The flotation separation method of copper-molybdenum mixed flotation concentrate according to claim 1, characterized in that: The thickener underflow concentration in S1) is 50%-60%.

3. The flotation separation method of copper-molybdenum mixed flotation concentrate according to claim 1, characterized in that: The first roughing in S2) comprises: subjecting the ground material to slurry treatment to adjust the slurry pH to 11-13; The amount of gangue mineral inhibitor used in the roughing process is 200g / t to 300g / t, the amount of chalcopyrite inhibitor used is 2500g / t to 3500g / t, and the amount of molybdenite collector added is 100 to 140g / t; In the first concentration operation, the amount of gangue mineral inhibitor is 150g / t to 200g / t, the amount of chalcopyrite inhibitor is 1000g / t to 2000g / t, and the amount of molybdenite collector added is 30 to 70g / t; In the first sweeping operation, the amount of gangue mineral inhibitor used is 50g / t-150g / t, the amount of chalcopyrite inhibitor used is 600g / t-1000g / t, and the amount of molybdenite collector added is 10-30g / t.

4. The flotation separation method of copper-molybdenum mixed flotation concentrate according to claim 1, characterized in that: The underflow concentration of the concentrator in S3) is 30%-40%, the grinding concentration of the stirred mill is 30%-40%, the medium filling rate is 20%-30%, and the grinding medium is steel balls and ceramic balls.

5. The flotation separation method of copper-molybdenum mixed flotation concentrate according to claim 1, characterized in that: In the second concentration in S4), the amount of gangue mineral inhibitor is 150g / t to 250g / t, the amount of chalcopyrite inhibitor is 800g / t to 1200g / t, and the amount of molybdenite collector added is 30 to 70g / t; In the third concentration, the amount of gangue mineral inhibitor is 100g / t-200g / t, the amount of chalcopyrite inhibitor is 800g / t-1200g / t, and the amount of molybdenite collector added is 30-70g / t; In the fourth concentration, the amount of gangue mineral inhibitor used is 70g / t-170g / t, the amount of chalcopyrite inhibitor used is 600g / t-1000g / t, and the amount of molybdenite collector added is 20-40g / t.

6. The flotation separation method of copper-molybdenum mixed flotation concentrate according to claim 1, characterized in that: In the second scanning of S4), the amount of gangue mineral inhibitor used is 100 g / t to 200 g / t, the amount of chalcopyrite inhibitor used is 300 g / t to 500 g / t, and the amount of molybdenite collector added is 60 to 100 g / t; In the third scanning, the amount of gangue mineral inhibitor used is 80 g / t to 180 g / t, the amount of chalcopyrite inhibitor used is 400 g / t to 600 g / t, and the amount of molybdenite collector added is 40 to 60 g / t.

7. The flotation separation method of copper-molybdenum mixed flotation concentrate according to any one of claims 3, 5 or 6, characterized in that: The molybdenite collector is a mixture of polymethoxy dimethyl ether, fatty acid ester and emulsifier, and the mass ratio of the three is 55-60:30-40:5-10.

8. The flotation separation method of copper-molybdenum mixed flotation concentrate according to any one of claims 3, 5 or 6, characterized in that: The gangue mineral inhibitor is a mixture of water glass and sodium hexametaphosphate, and the mass ratio between the two is 1:

1.

9. The flotation separation method of copper-molybdenum mixed flotation concentrate according to any one of claims 3, 5 or 6, characterized in that: The chalcopyrite inhibitor is a mixture of tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate and polyethylene glycol, with a mass ratio of 15-20:25-30:20-30: 18-25：12-15。 10. The flotation separation method of copper-molybdenum mixed flotation concentrate according to claim 1, characterized in that: The recovery rate of molybdenum in the flotation separation method of the copper-molybdenum mixed flotation concentrate is more than 80%, and the recovery rate of copper is more than 99%.

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