A flotation separation method for copper-molybdenum mixed flotation concentrate

Abstract

The present invention discloses a flotation separation method for a copper-molybdenum mixed flotation concentrate. The method comprises the following steps: S1: After the copper-molybdenum mixed flotation concentrate is concentrated in a thickener, the overflow enters a water treatment system, and the underflow undergoes a roughing operation, a cleaning operation, and a scavenging operation to obtain a first-stage copper concentrate and a copper-molybdenum concentrate; S2: After the copper-molybdenum concentrate is concentrated, the underflow is fed into a mill for agitator grinding; S3: The stirred milled product in S2 undergoes three cleaning operations and two scavenging operations to obtain a final molybdenum concentrate and a second-stage copper concentrate. The copper-molybdenum separation inhibitor is prepared from tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate, and polyethylene glycol. The newly prepared chalcopyrite inhibitor used in the present invention can completely replace sodium sulfide, achieving a molybdenum recovery rate of over 80% and a copper recovery rate of over 99%, thereby achieving efficient separation of the copper-molybdenum mixed flotation concentrate.

Description

Technical Field

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

[0002] Flotation is a common process for copper-molybdenum separation. Co-flotation is typically performed first, leveraging the excellent floatability of copper-molybdenum sulfides, followed by copper-molybdenum separation. This method can yield concentrates with high grades and recoveries. However, the large amount of xanthate added as a collector during the co-flotation stage presents challenges in suppressing chalcopyrite. Currently, the flotation process for copper-molybdenum separation requires the addition of large amounts of sodium sulfide, requiring at least 25 kg / t, and sometimes even 40-60 kg / t, to meet the separation requirements for the copper-molybdenum mixed concentrate. The cost of sodium sulfide accounts for approximately 60%-80% of the total molybdenum processing cost, resulting in losses 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 copper-molybdenum mixed flotation concentrate, which is based on a new copper sulfide mineral flotation depressant, completely replacing 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 object 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 slurry;

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

[0008] The rougher concentrate is subjected to a 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 primary scavenging operation to obtain a scavenged concentrate and a copper concentrate; the primary scavenged tailings and the primary scavenged concentrate are returned to the roughing operation;

[0010] S3) feeding the primary concentrate obtained in S2) into a ￠20m thickener for thickening, with the overflow of the thickener returning to the circulating water system and the underflow of the thickener feeding 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 is returned to the ￠20m thickener, and the scavenging tailings are the second-stage copper concentrate.

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

[0013] Furthermore, the first roughing in S2) includes: subjecting the ground mineral 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 used is 150g / t to 200g / t, the amount of chalcopyrite inhibitor used 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 to 150g / t, the amount of chalcopyrite inhibitor used is 600g / t to 1000g / t, and the amount of molybdenite collector added is 10 to 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 media are steel balls and ceramic balls.

[0018] Furthermore, 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] The amount of gangue mineral inhibitor used in the third concentration is 100g / t to 200g / t, the amount of chalcopyrite inhibitor used is 800g / t to 1200g / t, and the amount of molybdenite collector added is 30 to 70g / t;

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

[0021] Furthermore, in the second sweep in 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;

[0022] In the third sweep, 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 polymethoxydimethyl 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 from copper-molybdenum mixed flotation concentrates. The preparation method is simple and the raw materials of the reagents are widely available. This significantly reduces the amount of sodium sulfide used and lowers mineral processing costs.

[0028] The multi-stage concentration and drug removal method and the continuous stirring and scrubbing method of the stirred mill can effectively clean the mineral surface, so that the collector adsorbed on the chalcopyrite surface is desorbed, 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 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 understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work premise belong to the scope of protection of the present invention. Those who do not specify specific conditions in the embodiments are carried out according to normal conditions or the conditions recommended by the manufacturer. Those whose reagents or instruments are not specified by the manufacturer are conventional products that can be purchased commercially.

[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, the present invention provides a flotation separation method for copper-molybdenum mixed flotation concentrate, comprising 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 operation;

[0034] S2, mixing the underflow slurry in S1 with a gangue mineral inhibitor, a chalcopyrite inhibitor, and a molybdenite collector successively, and performing a primary roughing operation to obtain a roughing concentrate and a roughing tailing; the roughing concentrate is subjected to a primary concentration in a flotation machine to obtain a copper-molybdenum roughing concentrate; the primary roughing tailing is fed into a flotation machine to perform a primary scavenging operation to obtain a scavenging concentrate and a first-stage copper concentrate; the primary concentrated tailings and the primary scavenging concentrate are returned to the roughing operation;

[0035] The gangue mineral inhibitors are water glass and hexametazoline, the chalcopyrite inhibitors are tetramethylthiouracil, thiohydantoin, chloroacetate, tributyl phosphonate, and polyethylene glycol, and the molybdenite collectors are polymethoxydimethyl ether, fatty acid ester, and emulsifier.

[0036] S3, feeding the selected concentrate into a ￠20m thickener for concentration 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 scavenged concentrate returns to the second concentration operation, the scavenged tailings are fed into the third scavenging operation, the concentrate of the third scavenging is returned to the ￠20m thickener, and the scavenged tailings are the second-stage copper concentrate;

[0038] Wherein, the collector comprises polyoxyethylene 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 sweeping 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 media are 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 70g / t to 170g / t, the amount of chalcopyrite inhibitor used is 600g / t to 1000g / t, and the amount of molybdenite collector added is 20 to 40g / 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 a ￠30m thickener for concentration and drug removal, and the underflow of the thickener is fed into a flotation system for flotation separation. The underflow concentration of the thickener is 60%;

[0054] S2. After successively mixing the underflow slurry from S1 with a gangue mineral inhibitor, a chalcopyrite inhibitor, and a molybdenite collector, the pH of the slurry is adjusted to 11-13, and a primary roughing operation is performed. Roughing concentrate and roughing tailings are obtained; the roughing concentrate is subjected to a primary concentrating process on a flotation machine to obtain a copper-molybdenum roughing concentrate; the primary roughing tailings are fed into a flotation machine for a primary scavenging process to obtain a scavenged concentrate and a first-stage copper concentrate; the primary concentrating tailings and the primary scavenged concentrate are returned to the roughing process;

[0055] During the roughing process, the mass ratio of the gangue mineral inhibitor water glass and sodium hexametaphosphate is 1:1, and the dosage is 300 g / t; the mass ratio of the 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 the 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, and 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 scavenged concentrate returns to the second concentration operation, the scavenged tailings are fed into the third scavenging operation, the concentrate of the third scavenging is returned to the ￠20m thickener, and the scavenged 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 sweep, 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 sweep, 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 a ￠30m thickener for concentration and drug removal, and the underflow of the thickener is fed into a flotation system for flotation separation. The underflow concentration of the thickener is 54%;

[0067] S2. After successively mixing the underflow slurry from S1 with a gangue mineral inhibitor, a chalcopyrite inhibitor, and a molybdenite collector, the pH of the slurry is adjusted to 12, and a primary roughing operation is performed. Rougher concentrate and rougher tailings are obtained; the rougher concentrate is subjected to a primary concentrating process on a flotation cell to obtain a copper-molybdenum rougher concentrate; the primary rougher tailings are fed into a flotation cell for a primary scavenging process to obtain a scavenged concentrate and a first-stage copper concentrate; the primary concentrating tailings and the primary scavenged concentrate are returned to the roughing process;

[0068] In the roughing process, the mass ratio of the gangue mineral inhibitors water glass and sodium hexametaphosphate is 1:2, and the dosage is 250 g / t; the mass ratio of the 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 the molybdenite collectors polymethoxydimethyl ether, fatty acid ester, and emulsifier is 55:30:15, and the dosage of the reagent 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, with the underflow concentration of the thickener being 35%, the overflow of the thickener returning to the circulating water system, and the underflow of the thickener feeding into a stirred mill, with the grinding concentration of the stirred mill being 40%, the medium filling rate being 25%, and the grinding medium being 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 scavenged concentrate returns to the second concentration operation, the scavenged tailings are fed into the third scavenging operation, the concentrate of the third scavenging is returned to the ￠20m thickener, and the scavenged 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 sweep, 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 sweep, 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 a ￠30m thickener for concentration and drug removal, and the underflow of the thickener is fed into a flotation system for flotation separation. The underflow concentration of the thickener is 58%;

[0080] S2. After successively mixing the underflow slurry from S1 with a gangue mineral inhibitor, a chalcopyrite inhibitor, and a molybdenite collector, the pH of the slurry is adjusted to 12, and a primary roughing operation is performed. Rougher concentrate and rougher tailings are obtained; the rougher concentrate is subjected to a primary concentrating process on a flotation cell to obtain a copper-molybdenum rougher concentrate; the primary rougher tailings are fed into a flotation cell for a primary scavenging process to obtain a scavenged concentrate and a first-stage copper concentrate; the primary concentrating tailings and the primary scavenged concentrate are returned to the roughing process;

[0081] During the roughing process, the mass ratio of the gangue mineral inhibitors water glass and sodium hexametaphosphate is 1:2, and the dosage is 220 g / t; the mass ratio of the chalcopyrite inhibitors 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 the molybdenite collectors polymethoxydimethyl ether, fatty acid ester, and emulsifier is 60:30:10, and the dosage of the reagents 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, with the underflow concentration of the thickener being 35%, the overflow of the thickener returning to the circulating water system, and the underflow of the thickener feeding into a stirred mill, with the grinding concentration of the stirred mill being 32%, the medium filling rate being 28%, and the grinding medium being 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 scavenged concentrate returns to the second concentration operation, the scavenged tailings are fed into the third scavenging operation, the concentrate of the third scavenging is returned to the ￠20m thickener, and the scavenged 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] The amount of gangue mineral inhibitor used in the second sweep 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 sweep, 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 polyoxyethylene dimethyl ether, fatty acid ester, and emulsifier is 57:33:10.

[0093] Example 5

[0094] The flotation separation method of the copper-molybdenum mixed flotation concentrate provided in this embodiment refers to Example 1, except that, in step S2, the ratio of the 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] Table 1:

[0106]

[0107] 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 they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solution to 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) Copper-molybdenum mixed flotation concentrate feeding The thickener performs concentration and drug removal, and the underflow of the thickener is fed into the flotation system for flotation separation to obtain underflow pulp; S2) successively mixing the underflow slurry in S1) with a gangue mineral inhibitor, a chalcopyrite inhibitor, and a molybdenite collector, and then performing a roughing operation to obtain a roughing concentrate and a roughing tailing; The rougher concentrate is subjected to a primary concentration by a flotation machine to obtain a primary concentrated concentrate and a primary concentrated tailings; The rougher tailings are fed into a flotation machine for a scavenging operation to obtain scavenged concentrate and a copper concentrate; The primary concentrating tailings and primary scavenging concentrate are returned to the roughing operation The primary roughing comprises: subjecting the underflow pulp to a slurry conditioning treatment to adjust the pulp pH to 11-13; The amount of gangue mineral inhibitor used in the primary roughing process 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; In the primary concentration operation, the amount of gangue mineral inhibitor used is 150g / t to 200g / t, the amount of chalcopyrite inhibitor used is 1000g / t to 2000g / t, and the amount of molybdenite collector added is 30 to 70g / t; in the primary scavenging operation, the amount of gangue mineral inhibitor used is 50g / t to 150g / t, the amount of chalcopyrite inhibitor used is 600g / t to 1000g / t, and the amount of molybdenite collector added is 10 to 30g / t; S3) feeding the primary concentrate obtained in S2) into The thickener performs concentration treatment, the overflow of the thickener returns to the circulating water system, and the underflow of the thickener is fed into the 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 scavenged concentrate is returned to the second concentration operation, the scavenged tailings are fed into the third scavenging operation, the concentrate of the third scavenging is returned to the ￠20m thickener, and the scavenged tailings are the second stage copper concentrate; The molybdenite collector is a mixture of polyoxymethylene dimethyl ether, fatty acid ester and emulsifier, and the mass ratio of the three is 55-60:30-40:5-10; 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.

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 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 media are steel balls and ceramic balls.

4. 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 used is 150g / t to 250g / t, the amount of chalcopyrite inhibitor used is 800g / t to 1200g / t, and the amount of molybdenite collector added is 30 to 70g / t; The amount of gangue mineral inhibitor used in the third concentration is 100g / t to 200g / t, the amount of chalcopyrite inhibitor used is 800g / t to 1200g / t, and the amount of molybdenite collector added is 30 to 70g / t; In the fourth concentration, the amount of gangue mineral inhibitor used is 70g / t to 170g / t, the amount of chalcopyrite inhibitor used is 600g / t to 1000g / t, and the amount of molybdenite collector added is 20 to 40g / t.

5. The flotation separation method of copper-molybdenum mixed flotation concentrate according to claim 1, characterized in that: In the second sweep in 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 sweep, 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.

6. The flotation separation method for copper-molybdenum mixed flotation concentrate according to any one of claims 4 or 5, characterized in that: The gangue mineral inhibitor is a mixture of water glass and sodium hexametaphosphate, with a mass ratio of 1:

1.

7. 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 reaches more than 80%, and the recovery rate of copper reaches more than 99%.

Images