Flotation depressant for separating chalcopyrite and molybdenite, and chalcopyrite and molybdenite beneficiation method

Abstract

The present invention provides a flotation depressant for separating chalcopyrite and molybdenite, and a chalcopyrite and molybdenite beneficiation method, specifically relating to the field of mineral processing technology. The flotation depressant comprises sodium thioglycolate, a hydroxycarboxylic acid homologue, and a reducing agent in a mass ratio of (20-60):(1-5):(1-5). The hydroxycarboxylic acid homologue comprises at least one of 3-mercaptopropionic acid, β-mercaptopropionic acid, thiopropanoic acid, mercaptopropionic acid, and thiolactic acid. The flotation depressant provided by the present invention is economical to use and easy to add, effectively achieving efficient separation of molybdenite and chalcopyrite. Furthermore, the flotation depressant successfully solves the problem of excessive copper impurities in molybdenum concentrate when using only sodium thioglycolate, thereby reducing the overall cost of the depressant during flotation. The flotation depressant is not only highly efficient, but also clean and safe, effectively solving the difficulties in the separation of chalcopyrite and molybdenite.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, in particular to a flotation depressant for separating chalcopyrite and molybdenite, and a mineral processing method for chalcopyrite and molybdenite. Background Art

[0002] Chalcopyrite, one of the primary minerals in polymetallic sulfide ores, often coexists with valuable minerals such as pyrite, galena, sphalerite, and sometimes molybdenite, and exhibits excellent floatability. Therefore, effectively suppressing chalcopyrite, which exhibits high floatability within molybdenite, is crucial for improving the grade and recovery of molybdenite. In the flotation process of polymetallic sulfide ores, chalcopyrite is typically suppressed first to prioritize the flotation of target minerals such as molybdenite. However, this process can inadvertently activate chalcopyrite, potentially affecting flotation efficiency. Therefore, effectively suppressing chalcopyrite and improving the flotation performance of molybdenite have become pressing challenges in the flotation of polymetallic sulfide ores.

[0003] Currently, inhibitors for chalcopyrite are primarily categorized into two main groups: inorganic and organic. Commonly used inorganic inhibitors include cyanide and Knox agents. These dissociated ions adsorb onto the surface of copper minerals, increasing their hydrophilicity, while having little effect on molybdenite. While these inhibitors offer advantages such as high inhibitory efficacy and low dosage, their toxicity and potential environmental pollution limit their application. Among organic inhibitors, sodium thioglycolate (HSCH2COONa) is a novel copper-separating inhibitor. The -HS and -COOH groups in its molecules can form a hydrophilic film on the surface of copper minerals, increasing their hydrophilicity. However, the high cost of sodium thioglycolate limits its widespread use.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The object of the present invention is to provide a flotation depressant for separating chalcopyrite and molybdenite, and a beneficiation method for chalcopyrite and molybdenite, aiming to solve at least one of the above-mentioned technical problems in the prior art.

[0006] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0007] A first aspect of the present invention provides a flotation depressant for separating chalcopyrite and molybdenite, comprising sodium thioglycolate, a hydroxycarboxylic acid homologue and a reducing agent in a mass ratio of (20-60):(1-5):(1-5); the hydroxycarboxylic acid homologue comprises at least one of 3-mercaptopropionic acid, β-mercaptopropionic acid, thiopropanoic acid, mercaptopropionic acid and thiolactic acid.

[0008] Furthermore, the reducing agent includes at least one of sodium sulfide, sodium sulfite, sodium sulfate, and sodium metabisulfite.

[0009] Furthermore, the flotation depressant comprises sodium thioglycolate, thiolactic acid and sodium sulfide in a mass ratio of (12-20):1:1.

[0010] Furthermore, each component is added in the form of an aqueous solution; preferably, the concentration of the sodium thioglycolate aqueous solution is 10-20 wt%; preferably, the concentration of the hydroxycarboxylic acid homologue aqueous solution is 1-5 wt%; preferably, the concentration of the reducing agent aqueous solution is 1-5 wt%.

[0011] A second aspect of the present invention provides a chalcopyrite and molybdenite beneficiation method, comprising adding a collector and a frother to the pulp of the raw ore for roughing to obtain a roughing concentrate and a roughing tailing, pre-concentrating and concentrating the roughing concentrate to obtain a concentrate, and scavenging the roughing tailing to obtain a tailing.

[0012] Wherein, the reagents used for pre-concentration and concentrating include the flotation depressant described in the first aspect.

[0013] Furthermore, the particles with a particle size less than 200 mesh account for 55-60 wt % of the slurry.

[0014] Preferably, the collector is hydrocarbon oil.

[0015] Preferably, the hydrocarbon oil includes at least one of kerosene, diesel, transformer oil and white oil.

[0016] Preferably, the foaming agent includes at least one of terpineol (also known as 2# oil), monohydric alcohol, fusel alcohol, and methyl isobutyl carbinol.

[0017] Furthermore, based on the mass of the original ore, the added amount of the collector is 5-100 g / t.

[0018] Preferably, based on the mass of the raw ore, the amount of the foaming agent added is 1-50 g / t.

[0019] Preferably, based on the mass of the raw ore, the added amount of the flotation depressant is 10-100 g / t.

[0020] Furthermore, the rough selection is performed at least once.

[0021] Preferably, the reagents used in the pre-concentration include the flotation depressant and the collector.

[0022] Preferably, the method further includes a regrinding process of the pre-concentrated concentrate before concentrating, and the proportion of particles with a particle size of less than 400 mesh in the slurry after regrinding is 80-90wt%.

[0023] Furthermore, the selection is divided into one-stage selection, two-stage selection and three-stage selection.

[0024] Preferably, the first stage concentrated tailings are subjected to first stage scavenging and second stage scavenging to obtain fine scavenging tailings.

[0025] Furthermore, the concentrate from the first stage of scavenging is returned and combined with the pre-concentrated concentrate to undergo another stage of concentration.

[0026] Preferably, the concentrate from the second stage scavenging is returned and combined with the tailings from the first stage to undergo another first stage scavenging.

[0027] Preferably, the second-stage concentrated tailings and the third-stage concentrated tailings are respectively returned to the previous level of concentration process for further concentration.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] The flotation depressant provided by the present invention is economical to use and easy to add, effectively achieving the efficient separation of molybdenite and chalcopyrite. Furthermore, the flotation depressant successfully addresses the issue of excessive copper impurities in molybdenum concentrate when using only sodium thioglycolate, thereby reducing the overall cost of the depressant during the flotation process. This flotation depressant is not only highly effective, but also clean and safe, effectively resolving the challenges associated with the separation of chalcopyrite and molybdenite.

[0030] The mineral processing method provided by the present invention performs roughing by adding a collector and a frother to the raw ore slurry, effectively separating the rougher concentrate from the rougher tailings. Subsequently, the rougher concentrate undergoes pre-concentration and concentrating, and the rougher tailings undergo scavenging to improve the concentrate grade and recover valuable minerals from the tailings. This mineral processing method not only improves separation efficiency and resource utilization, but also solves the difficulties in separating chalcopyrite and molybdenite. It offers the advantages of strong adaptability and high cost-effectiveness, providing an efficient solution for the separation of polymetallic sulfide ores. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is the mineral processing method roadmap of Example 8. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0035] A first aspect of the present invention provides a flotation depressant for separating chalcopyrite and molybdenite, comprising sodium thioglycolate, a hydroxycarboxylic acid homologue and a reducing agent in a mass ratio of (20-60):(1-5):(1-5); the hydroxycarboxylic acid homologue comprises at least one of 3-mercaptopropionic acid, β-mercaptopropionic acid, thiopropanoic acid, mercaptopropionic acid and thiolactic acid.

[0036] The flotation depressant provided by the present invention is economical to use and easy to add, effectively achieving the efficient separation of molybdenite and chalcopyrite. Furthermore, the flotation depressant successfully addresses the issue of excessive copper impurities in molybdenum concentrate when using only sodium thioglycolate, thereby reducing the overall cost of the depressant during the flotation process. This flotation depressant is not only highly effective, but also clean and safe, effectively resolving the challenges associated with the separation of chalcopyrite and molybdenite.

[0037] Typically, but not limiting, the ratios of sodium thioglycolate, hydroxycarboxylic acid homologue and reducing agent can be 20:1:1, 20:1:2, 20:1:3, 20:1:4, 20:1:5, 21:1:1, 21:1:2, 21:1:3, 21:1:4, 21:1:5, 22:1:1, 22:1:2, 22:1:3, 22:1:4, 4, 22:1:5, 23:1:1, 23:1:2, 23:1:3, 23:1:4, 23:1:5, 24:1:1, 24:1:2, 24:1:3, 24:1:4, 24:1:5, 25:1:1, 25:1:2, 25:1:3, 25:1:4, 25:1:5, 30:1:1, 30:1:2, 30: 1:3、30:1:4、30:1:5、35:1:1、35:1:2、35:1:3、35:1:4、35:1:5、40:1:1、40:1:2、40:1:3、40:1:4、40:1:5、45:1:1、45:1:2、45:1:3、45:1:4、45:1:5、50:1:1、5 0:1:2, 50:1:3, 50:1:4, 50:1:5, 55:1:1, 55:1:2, 55:1:3, 55:1:4, 55:1:5, 60:1:1, 60:1:2, 60:1:3, 60:1:4 or 60:1:5, or any ratio combination within the range of (20~60):(1~5):(1~5).

[0038] In the flotation depressant provided by the present invention, sodium thioglycolate utilizes its hydrophilic and solophilic groups to adsorb on the surface of chalcopyrite, increasing its hydrophilicity and reducing its floatability, while having a weak inhibitory effect on molybdenite, thereby achieving selective separation of copper and molybdenum. Hydroxycarboxylic acid homologues interact with the mineral surface through their acidic functional groups, changing the charge properties of the mineral surface and further enhancing the inhibitory effect on chalcopyrite. The reducing agent, by changing the redox environment in the ore pulp, affects the electronic structure and adsorption properties of the mineral surface, thereby enhancing the inhibitory effect of sodium thioglycolate and hydroxycarboxylic acid homologues. This flotation depressant not only effectively separates chalcopyrite from molybdenite, but also improves the grade and recovery rate of molybdenum concentrate.

[0039] Furthermore, the hydroxycarboxylic acid homologue is preferably thiolactic acid.

[0040] Preferably, the reducing agent includes at least one of sodium sulfide, sodium sulfite, sodium sulfate, and sodium metabisulfite.

[0041] Furthermore, the flotation depressant comprises sodium thioglycolate, thiolactic acid and sodium sulfide in a mass ratio of (12-20):1:1.

[0042] Typically, but not limiting, the mass ratio of sodium thioglycolate to thiolactic acid and sodium sulfide can be 12:1:1, 13:1:1, 14:1:1, 15:1:1, 16:1:1, 17:1:1, 18:1:1, 19:1:1, 20:1:1.

[0043] Furthermore, each component is added in the form of an aqueous solution; preferably, the concentration of the sodium thioglycolate aqueous solution is 10-20 wt%; preferably, the concentration of the hydroxycarboxylic acid homologue aqueous solution is 1-5 wt%; preferably, the concentration of the reducing agent aqueous solution is 1-5 wt%.

[0044] Typically, but not limiting, the concentration of the sodium thioglycolate aqueous solution can be 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, or 20 wt%, or any concentration within the range of 10-20 wt%. The concentration of the hydroxycarboxylic acid homologue aqueous solution can be 1 wt%, 2 wt%, 3 wt%, 4 wt%, or 5 wt%, or any concentration within the range of 1-5 wt%. The concentration of the reducing agent aqueous solution can also be 1 wt%, 2 wt%, 3 wt%, 4 wt%, or 5 wt%, or any concentration within the range of 1-5 wt%.

[0045] A second aspect of the present invention provides a chalcopyrite and molybdenite beneficiation method, comprising adding a collector and a frother to the pulp of the raw ore for roughing to obtain a roughing concentrate and a roughing tailing, pre-concentrating and concentrating the roughing concentrate to obtain a concentrate, and scavenging the roughing tailing to obtain a tailing.

[0046] Wherein, the reagents used for pre-concentration and concentrating include the flotation depressant described in the first aspect.

[0047] The mineral processing method provided by the present invention performs roughing by adding a collector and a frother to the raw ore slurry, effectively separating the rougher concentrate from the rougher tailings. Subsequently, the rougher concentrate undergoes pre-concentration and concentrating, and the rougher tailings undergo scavenging to improve the concentrate grade and recover valuable minerals from the tailings. This mineral processing method not only improves separation efficiency and resource utilization, but also solves the difficulties in separating chalcopyrite and molybdenite. It offers the advantages of strong adaptability and high cost-effectiveness, providing an efficient solution for the separation of polymetallic sulfide ores.

[0048] Furthermore, the particles with a particle size less than 200 mesh account for 55-60 wt % of the slurry.

[0049] Typically but not limiting, the proportion of particles with a particle size less than 200 mesh in the slurry can be 55wt%; 56wt%, 57wt%, 58wt%, 59wt%, 60wt%; or any proportion within the range of 55-60wt%.

[0050] Preferably, the collector is hydrocarbon oil.

[0051] Preferably, the hydrocarbon oil includes at least one of kerosene, diesel, transformer oil, and white oil, preferably kerosene.

[0052] Preferably, the foaming agent includes at least one of terpineol, monohydric alcohol, fusel alcohol, and methyl isobutyl carbinol.

[0053] Furthermore, based on the mass of the original ore, the added amount of the collector is 5-100 g / t.

[0054] Preferably, based on the mass of the raw ore, the amount of the foaming agent added is 1-50 g / t.

[0055] Preferably, based on the mass of the raw ore, the added amount of the flotation depressant is 10-100 g / t.

[0056] Based on the mass of the raw ore, the amount of the collector added can be 5 g / t, 10 g / t, 20 g / t, 30 g / t, 40 g / t, 50 g / t, 60 g / t, 70 g / t, 80 g / t, 90 g / t, or 100 g / t, or any amount within the range of 5-100 g / t. The amount of the foaming agent added can be 1 g / t, 5 g / t, 10 g / t, 15 g / t, 20 g / t, 25 g / t, 30 g / t, 35 g / t, 40 g / t, 45 g / t, or 50 g / t, or any amount within the range of 1-50 g / t. The added amount of the flotation depressant may be 10 g / t, 20 g / t, 30 g / t, 40 g / t, 50 g / t, 60 g / t, 70 g / t, 80 g / t, 90 g / t or 100 g / t; or any amount within the range of 10-100 g / t.

[0057] Furthermore, the rough selection is performed at least once.

[0058] Preferably, the reagents used in the pre-concentration include the flotation depressant and the collector.

[0059] Preferably, the method further includes a regrinding process of the pre-concentrated concentrate before concentrating, and the proportion of particles with a particle size of less than 400 mesh in the slurry after regrinding is 80-90wt%.

[0060] After the slurry is subjected to the regrinding process, the percentage of particles with a particle size of less than 400 mesh in the mass of the original ore can be 80wt%, 81wt%, 82wt%, 83wt%, 84wt%; 85wt%, 86wt%, 87wt%, 88wt%, 89wt% or 90wt%; or any proportion within the range of 80~90wt%.

[0061] Furthermore, the selection is divided into one-stage selection, two-stage selection and three-stage selection.

[0062] Preferably, the first stage concentrated tailings are subjected to first stage scavenging and second stage scavenging to obtain fine scavenging tailings.

[0063] Furthermore, the concentrate from the first stage of scavenging is returned and combined with the pre-concentrated concentrate to undergo another stage of concentration.

[0064] Preferably, the concentrate from the second stage scavenging is returned and combined with the tailings from the first stage to undergo another first stage scavenging.

[0065] Preferably, the second-stage concentrated tailings and the third-stage concentrated tailings are respectively returned to the previous level of concentration process for further concentration.

[0066] The present invention is further illustrated below by specific examples and comparative examples. However, it should be understood that these examples are merely for the purpose of further explanation and should not be construed as limiting the present invention in any form. The raw materials used in the examples and comparative examples of the present invention, unless otherwise specified, were prepared under conventional conditions or conditions recommended by the manufacturer. Reagents or instruments used without manufacturer's indication are all commercially available conventional products.

[0067] Example 1

[0068] This embodiment provides a flotation depressant for separating chalcopyrite and molybdenite, wherein a sodium thioglycolate aqueous solution, a thiolactic acid aqueous solution, and a sodium sulfide aqueous solution are mixed in a mass ratio of 2:1:1. After conversion, the mass ratio of sodium thioglycolate, thiolactic acid, and sodium sulfide is 10:1:1.

[0069] The concentration of the sodium thioglycolate aqueous solution is 15 wt %; the concentration of the thiolactic acid aqueous solution is 3 wt %; and the concentration of the sodium sulfide aqueous solution is 3 wt %.

[0070] Example 2

[0071] This embodiment provides a flotation depressant for separating chalcopyrite and molybdenite, wherein a sodium thioglycolate aqueous solution, a thiolactic acid aqueous solution, and a sodium sulfide aqueous solution are mixed in a mass ratio of 4:1:1. After conversion, the mass ratio of sodium thioglycolate, thiolactic acid, and sodium sulfide is 20:1:1.

[0072] The concentration of the sodium thioglycolate aqueous solution is 15 wt %; the concentration of the thiolactic acid aqueous solution is 3 wt %; and the concentration of the sodium sulfide aqueous solution is 3 wt %.

[0073] Example 3

[0074] This embodiment provides a flotation depressant for separating chalcopyrite and molybdenite, wherein a sodium thioglycolate aqueous solution, a thiolactic acid aqueous solution, and a sodium sulfide aqueous solution are mixed in a mass ratio of 2.4:1:1. After conversion, the mass ratio of sodium thioglycolate, thiolactic acid, and sodium sulfide is 12:1:1.

[0075] The concentration of the sodium thioglycolate aqueous solution is 15 wt %; the concentration of the thiolactic acid aqueous solution is 3 wt %; and the concentration of the sodium sulfide aqueous solution is 3 wt %.

[0076] Example 4

[0077] This embodiment provides a flotation depressant for separating chalcopyrite and molybdenite, wherein a sodium thioglycolate aqueous solution, a thiolactic acid aqueous solution, and a sodium sulfide aqueous solution are mixed in a mass ratio of 0.8:1:1. After conversion, the mass ratio of sodium thioglycolate, thiolactic acid, and sodium sulfide is 20:5:5.

[0078] The concentration of the sodium thioglycolate aqueous solution is 15 wt %; the concentration of the thiolactic acid aqueous solution is 3 wt %; and the concentration of the sodium sulfide aqueous solution is 3 wt %.

[0079] Example 5

[0080] This embodiment provides a flotation depressant for separating chalcopyrite and molybdenite, wherein a sodium thioglycolate aqueous solution, a thiolactic acid aqueous solution, and a sodium sulfide aqueous solution are mixed in a mass ratio of 12:1:1. After conversion, the mass ratio of sodium thioglycolate, thiolactic acid, and sodium sulfide is 60:1:1.

[0081] The concentration of the sodium thioglycolate aqueous solution is 15 wt %; the concentration of the thiolactic acid aqueous solution is 3 wt %; and the concentration of the sodium sulfide aqueous solution is 3 wt %.

[0082] Example 6

[0083] This embodiment provides a flotation depressant for separating chalcopyrite and molybdenite. The difference from Example 1 is that mercaptopropionic acid replaces thiolactic acid. Other parameters are the same as those in Example 1 and are not repeated here.

[0084] Example 7

[0085] This embodiment provides a flotation depressant for separating chalcopyrite and molybdenite. The difference from Example 1 is that thiopropionic acid is used instead of thiolactic acid. Other parameters are the same as those in Example 1 and are not repeated here.

[0086] Comparative Example 1

[0087] This comparative example provides a flotation depressant for separating chalcopyrite and molybdenite, which contains only sodium thioglycolate.

[0088] Comparative Example 2

[0089] This comparative example provides a flotation depressant for separating chalcopyrite and molybdenite, which contains only thiolactic acid.

[0090] Comparative Example 3

[0091] This comparative example provides a flotation depressant for separating chalcopyrite and molybdenite, which contains only sodium sulfide.

[0092] Example 8

[0093] This example was used to separate molybdenite and chalcopyrite from a mining area in Inner Mongolia. The original ore contained approximately 0.097% molybdenum and 0.033% Cu. Some chalcopyrite was deposited in a relatively fine particle size, resulting in it remaining undissociated from the molybdenite. Residual reagents on the surface of the minerals in the selected section made separation more difficult.

[0094] Ore dressing process such as Figure 1 As shown, the specific steps include:

[0095] 1. The raw ore is crushed, screened, and slurried to obtain a slurry containing 58% particles with a size less than 200 mesh. 100g / t of kerosene (a collector) and 30g / t of 2# oil (a foaming agent) are added to the slurry for roughing. Roughing concentrate and roughing tailings are obtained after roughing.

[0096] 2. 100 g / t of the flotation depressant and 20 g / t of kerosene as a collector of Example 1 were added to the rougher concentrate for pre-concentration to obtain a pre-concentrated concentrate and pre-concentrated tailings. The pre-concentrated concentrate was regrinded, and after regrinding, the proportion of particles with a particle size of less than 400 mesh in the pulp was 85 wt%. Then, 50 g / t of the flotation depressant and 20 g / t of kerosene as a collector of Example 1 were added for primary concentrating, followed by secondary and tertiary concentrating to obtain a concentrate.

[0097] The amount of flotation depressant used in Example 1 in both the second-stage concentration and the third-stage concentration was 25 g / t.

[0098] 3. Add 20g / t of kerosene as collector and 4g / t of 2# oil as foaming agent to the roughing tailings for the first stage of roughing. Add 5g / t of kerosene as collector to the tailings from the first stage of roughing for the second stage of roughing. The tailings obtained are the final tailings.

[0099] The concentrate obtained from the first stage roughing selection and the pre-selected tailings are mixed and returned to step 1 to continue roughing selection; the concentrate obtained from the second stage roughing selection is returned and mixed with the tailings from the first stage roughing selection to continue the second stage roughing selection.

[0100] 4. The tailings obtained from the first stage of concentration were added with 10 g / t of the flotation depressant of Example 1 to carry out the first stage of fine scavenging, and then the concentrate from the first stage of fine scavenging was subjected to the second stage of fine scavenging.

[0101] During the process, the first stage scavenging concentrate and the second stage concentrating tailings are returned to step 2 to be mixed with the pre-concentrated concentrate to continue the first stage concentrating; the third stage concentrating tailings are returned to the first stage concentrating concentrate to continue the second stage concentrating.

[0102] The concentrate from the second stage of fine sweeping is returned and mixed with the tailings from the first stage of fine sweeping to continue the first stage of fine sweeping.

[0103] 5. Finally, concentrate, tailings and fine sweeping tailings are obtained.

[0104] Examples 9-14

[0105] These examples separated molybdenite and chalcopyrite using the same beneficiation method as in Example 8. The flotation depressants used were provided by Examples 2-7. The dosage of the flotation depressants in each step was the same as in Example 8 and will not be repeated here.

[0106] Comparative Examples 4-6

[0107] These examples are carried out to separate molybdenite and chalcopyrite according to the same beneficiation method as Example 8. The flotation depressants used are provided by Comparative Examples 1-3. The amount of flotation depressants used in each step is the same as that in Example 8 and will not be repeated here.

[0108] Comparative Example 7

[0109] In this embodiment, molybdenite and chalcopyrite are separated by the same beneficiation method as in Example 8. The difference from Example 8 is that the flotation depressant is omitted in the process. The reagents and dosages in other processes are the same as in Example 8 and are not described again here.

[0110] Results

[0111] The grades of the concentrates, tailings and fine scavenging tailings in Examples 8-14 and Comparative Examples 4-7 were identified, and the results are summarized in Table 1.

[0112] Table 1

[0113]

[0114] As can be seen from Table 1, the effect of using sodium thioglycolate alone as a chalcopyrite inhibitor in Comparative Example 4 is significantly worse than that of using a combination of inhibitors, and the recovery of molybdenite is also 1.64% lower than that of Example 8. In Comparative Example 5, the use of thiolactic acid alone has a certain inhibitory effect on chalcopyrite, but its inhibitory effect on molybdenum is stronger than that of sodium thioglycolate alone. In Comparative Example 6, the inhibitory ability of sodium sulfide alone on chalcopyrite is very limited. Generally, a relatively large amount of sodium sulfide is used to show a strong inhibitory effect on chalcopyrite. In Comparative Example 7, without using any chalcopyrite inhibitor, the molybdenum concentrate has a Cu grade of 3.33% and a molybdenum grade of only 32.46%.

[0115] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A flotation depressant for separating chalcopyrite and molybdenite, characterized in that: The method comprises sodium thioglycolate, a hydroxycarboxylic acid homologue and a reducing agent in a mass ratio of (20-60):(1-5):(1-5); The hydroxycarboxylic acid homologue is at least one of 3-mercaptopropionic acid, β-mercaptopropionic acid, thiopropanoic acid and mercaptopropionic acid.

2. The flotation depressant according to claim 1, characterized in that The reducing agent includes at least one of sodium sulfide, sodium sulfite, sodium sulfate, and sodium metabisulfite.

3. The flotation depressant according to claim 1 or 2, characterized in that: Each component is added in the form of an aqueous solution.

4. The flotation depressant according to claim 3, characterized in that The concentration of the sodium thioglycolate aqueous solution is 10-20wt%.

5. The flotation depressant according to claim 3, characterized in that The concentration of the hydroxycarboxylic acid homologue aqueous solution is 1-5 wt %.

6. The flotation depressant according to claim 3, characterized in that The concentration of the reducing agent aqueous solution is 1~5wt%.

7. A method for beneficiating chalcopyrite and molybdenite, characterized in that: Adding a collector and a foaming agent to the pulp of the raw ore to perform roughing to obtain a roughing concentrate and a roughing tailing, pre-concentrating and concentrating the roughing concentrate to obtain a concentrate, and scavenging the roughing tailing to obtain a tailing; Wherein, the reagents used for pre-concentration and concentrating include the flotation depressant according to any one of claims 1 to 6.

8. The mineral processing method according to claim 7, characterized in that: In the slurry, particles with a particle size of less than 200 mesh account for 55-60 wt %.

9. The mineral processing method according to claim 7, characterized in that: The collector is hydrocarbon oil.

10. The mineral processing method according to claim 9, characterized in that: The hydrocarbon oil includes at least one of kerosene, diesel, transformer oil and white oil.

11. The mineral processing method according to claim 7, characterized in that: The foaming agent includes at least one of terpineol, monohydric alcohol, fusel alcohol, and methyl isobutyl carbinol.

12. The mineral processing method according to claim 7, characterized in that: Based on the mass of the original ore, the added amount of the collector is 5-100g / t.

13. The mineral processing method according to claim 7, characterized in that: Based on the mass of the raw ore, the added amount of the foaming agent is 1-50g / t.

14. The mineral processing method according to claim 7, characterized in that: Based on the mass of the original ore, the added amount of the flotation depressant is 10-100 g / t.

15. The mineral processing method according to claim 7, characterized in that: The rough selection is performed at least once.

16. The mineral processing method according to claim 7, characterized in that: The reagents used in the pre-concentration include the flotation depressant and the collector.

17. The mineral processing method according to claim 7, characterized in that: The mineral processing method further includes a regrinding process of the pre-concentrated concentrate before concentrating, and after the regrinding, the proportion of particles with a particle size of less than 400 mesh in the ore pulp is 80-90wt%.

18. The mineral processing method according to claim 7, characterized in that: The selection is divided into one-stage selection, two-stage selection and three-stage selection; The first stage concentrated tailings undergo first stage scavenging and second stage scavenging to obtain fine scavenging tailings.

19. The mineral processing method according to claim 18, characterized in that: The concentrate from the first stage of scavenging is returned and combined with the pre-concentrated concentrate for another stage of concentration; The concentrate from the second stage scavenging is returned and combined with the tailings from the first stage to undergo another first stage scavenging; The second-stage concentrated tailings and the third-stage concentrated tailings are returned to the previous level of concentration process for further concentration.

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