Bismuth-sulfur ore beneficiation method

Abstract

The invention discloses a bismuth-sulfur ore beneficiation method which comprises the following steps: S1, ore grinding: mixing bismuth-sulfur ore, quick lime and sodium sulfide, and carrying out ore grinding treatment to obtain ore pulp; and S2, flotation is conducted, specifically, the ore pulp ground in the step a is added into a flotation tank, the concentration and pH of the ore pulp are adjusted, sodium carbonate is added and stirred, then a collecting agent is added, air inflation flotation is conducted, and bismuth concentrate is obtained. According to the beneficiation method of the bismuth-sulfur ore, cyanide does not need to be adopted, the good sulfur inhibition effect can be achieved, the bismuth concentrate with the high grade and the high recovery rate is obtained, the beneficiation separation effect is basically consistent with the beneficiation separation effect through cyanide, and meanwhile the beneficiation method is simple in process and has wide application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal ore beneficiation, and in particular relates to a beneficiation method for bismuth sulfide ore. Background Art

[0002] Bismuth possesses a range of unique properties not found in other metals, such as a low melting point, expansion in cold and contraction in heat, a high specific gravity, and non-toxicity. These properties make it an indispensable raw material in the fields of medicine, metallurgy, chemical engineering, and electronics. Bismuth is primarily used in the manufacture of fusible alloys, as a metallurgical additive, and in the production of chemicals, semiconductors, and superconductors.

[0003] Bismuth is present in low concentrations in the Earth's crust and occurs naturally as a single element and in compounds. Isolated bismuth deposits are rare, and it is often found in association with other nonferrous metals, such as copper, lead, and zinc, forming complex polymetallic deposits. Because bismuth often coexists or coexists with other metals, its primary source is separation and extraction from these metals.

[0004] Bismuth-containing polymetallic sulfide ores are often accompanied by sulfide minerals such as pyrite, pyrrhotite, chalcopyrite, and galena. Since bismuth minerals have similar floatability to pyrite, chalcopyrite, pyrrhotite and other minerals, both copper-bismuth separation and bismuth-sulfur separation are relatively difficult. The bismuth concentrate obtained has low recovery rate and low grade, resulting in a large waste of resources and affecting the economic benefits of the mine.

[0005] In production practice, bismuth recovery is typically achieved through a "sulfur-inhibiting bismuth flotation" method. However, due to the high concentration of flotation reagents adhering to bismuth-sulfur concentrates and the similar flotability of bismuth minerals to pyrite and pyrrhotite, effective suppression of pyrite and pyrrhotite is crucial for obtaining qualified bismuth concentrates. Sodium cyanide has a very good inhibitory effect on sulfide minerals such as pyrite, pyrrhotite, and chalcopyrite, resulting in excellent test parameters. However, sodium cyanide is highly toxic and poses a serious environmental risk. Therefore, improvements in bismuth-sulfur beneficiation methods are urgently needed. Summary of the Invention

[0006] The present invention is based on the inventor's discovery and understanding of the following facts and problems: In the related art, CN103406209A discloses a method for recovering bismuthite from molybdenum tailings under weakly acidic conditions. Under a long slurry preparation time (10-15 minutes), using lead nitrate as an activator and xanthate as a collector, a bismuth concentrate with a bismuth recovery rate of >85% and a bismuth grade of >20% was obtained. However, in addition to bismuthite, bismuth also exists in the form of natural bismuth, copper bismuth ore, galena bismuth ore, etc., and under weakly acidic conditions, pyrite and pyrrhotite also have good floatability. When the pyrite content is high, this method will lead to serious bismuth-sulfur interconversion, and it is impossible to obtain qualified bismuth concentrate. CN107971127B discloses a beneficiation method for separating bismuth and sulfur from bismuth-sulfur concentrate. This method employs a "weak magnetic-strong magnetic-flotation" process, adding a sulfur inhibitor, a bismuth activator, a bismuth collector, and a frother to the magnetic tailings for flotation. This method produces a pyrrhotite-based sulfide concentrate 1, a pyrite-based sulfide concentrate 2, and a bismuth concentrate. This method is suitable for separating bismuth-sulfur concentrates with a high pyrrhotite content. However, this method cannot effectively recover and separate bismuth from coarse concentrates with low bismuth grades and high sulfur contents. CN102580857A discloses a beneficiation method for low-content molybdenum and bismuth in polymetallic ores. This process involves mixed flotation of molybdenum, bismuth, and sulfur, followed by separation of the sulfur concentrate and subsequent molybdenum-bismuth separation. This process allows for the comprehensive utilization of the valuable minerals molybdenum and bismuth without the addition of toxic sodium cyanide reagents. This method involves beneficiating low-grade ore, ultimately yielding a bismuth concentrate with a bismuth grade greater than 13.50% and a bismuth recovery greater than 72.0%. However, this method is complex and produces a relatively low-grade bismuth concentrate. Consequently, during the upgrading and separation process, sulfide minerals such as pyrite and pyrrhotite have similar floatability to bismuth, making upgrading bismuth concentrate difficult. Further research into the beneficiation of bismuth-sulfide ores is needed.

[0007] The present invention aims to at least partially address one of the technical problems in the related art. To this end, embodiments of the present invention provide a beneficiation method for bismuth-sulfur ore that eliminates the need for cyanide, achieves excellent sulfur suppression, and produces high-grade, high-recovery bismuth concentrate, achieving substantially the same performance as beneficiation and separation using cyanide. Furthermore, the method is simple in process and has broad application prospects.

[0008] The beneficiation method of bismuth sulfide ore according to the embodiment of the present invention comprises the following steps:

[0009] S1. Grinding: bismuth sulfide ore, quicklime and sodium sulfide are mixed and ground to obtain a slurry;

[0010] S2. Flotation: The slurry ground in step a is added to a flotation tank, the slurry concentration and pH are adjusted, sodium carbonate is added and stirred, and then a collector is added and aerated flotation is performed to obtain a bismuth concentrate.

[0011] The advantages and technical effects brought by the beneficiation method of bismuth sulfide ore in the embodiment of the present invention are as follows: 1. In the method of the embodiment of the present invention, since bismuth sulfide ore easily adheres to a large amount of flotation reagents, the fresh surface generated during the grinding process is easily attached by the reagents in the subsequent flotation process. Quicklime and sodium sulfide are added during the grinding process. Quicklime can produce hydrophilic substances on the surface of the mineral after grinding to inhibit sulfur. Sodium sulfide can not only remove the reagents but also inhibit pyrite. During the mineral re-grinding process, the fresh surfaces of sulfide minerals such as pyrite and pyrrhotite react with quicklime and sodium sulfide to produce hydrophilic substances, thereby achieving an inhibitory effect; 2. In the method of the embodiment of the present invention, the pH value of the slurry is adjusted, and the activator sodium carbonate is added to activate bismuth. Under the action of the collector, flotation is carried out to effectively inhibit pyrite; 3. The method of the embodiment of the present invention does not require the addition of highly toxic sodium cyanide. Under the reagent system of the embodiment of the present invention, efficient beneficiation of bismuth sulfide ore with low bismuth grade can be achieved to obtain high-grade bismuth concentrate, achieving a beneficiation effect similar to that of using sodium cyanide. Moreover, the process of the embodiment of the present invention is simple, which is conducive to industrial application.

[0012] In some embodiments, in step S1, the grinding process to -0.074 mm accounts for 80% to 90%, preferably 85%.

[0013] In some embodiments, in step S1, the amount of quicklime added is 3000 g / t to 5000 g / t, preferably 4000 g / t; the amount of sodium sulfide added is 50 g / t to 150 g / t, preferably 100 g / t, based on the weight of the bismuth sulfide ore.

[0014] In some embodiments, in step S2, the flotation comprises the following steps:

[0015] S21. The ground slurry was added to the flotation tank, the slurry concentration and pH were adjusted, sodium carbonate, ethyl thiocyanate and 25# black medicine were added, and aeration flotation was performed for roughing to obtain roughing concentrate and roughing tailings;

[0016] S22. The pH of the roughing tailings obtained in step S21 is adjusted, sodium sulfide, sodium carbonate, ethyl disulfide and 25# black medicine are added, and aeration flotation is performed once to obtain a scavenging concentrate and a scavenging tailings;

[0017] S23. The pH of the primary scavenging tailings obtained in step S22 is adjusted, sodium carbonate, ethyl thiocyanate, and 25# black medicine are added, and secondary scavenging is performed by aeration flotation to obtain a secondary scavenging concentrate and a secondary scavenging tailings;

[0018] S24. The rougher concentrate obtained in step S21 is slurried and concentrated to obtain concentrated concentrate and concentrated tailings.

[0019] In some embodiments, in step S21, the concentration of the slurry after slurry adjustment is 25% to 35%, preferably 33%; and the pH value is adjusted to 9.5 to 10.5, preferably 10.

[0020] In some embodiments, in step S21, the amount of sodium carbonate added is 700g / t to 900g / t, preferably 800g / t; the amount of ethyl sulfide nitrogen added is 80g / t to 160g / t, preferably 120g / t; the amount of 25# black medicine added is 80g / t to 160g / t, preferably 120g / t, based on the weight of the bismuth sulfide ore.

[0021] In some embodiments, in step S22, the pH of the rougher tailings is adjusted to 9.5-10.5, preferably 10.

[0022] In some embodiments, in step S22, the amount of sodium sulfide added is 30g / t to 70g / t, preferably 50g / t; the amount of sodium carbonate added is 350g / t to 450g / t, preferably 400g / t; the amount of ethyl thiocyanate added is 40g / t to 80g / t, preferably 60g / t; the amount of 25# black medicine added is 40g / t to 60g / t, preferably 60g / t, based on the weight of the roughing tailings.

[0023] In some embodiments, in step S23, the pH of the primary scavenging tailings is adjusted to 9.5-10.5, preferably 10.

[0024] In some embodiments, in step S23, the amount of sodium carbonate added is 300g / t to 400g / t, preferably 200g / t; the amount of ethyl thiocyanate added is 20g / t to 40g / t, preferably 30g / t; the amount of 25# black medicine added is 30g / t to 50g / t, preferably 40g / t, based on the weight of the single-stage scavenging tailings.

[0025] In some embodiments, in step S23, the secondary scavenged concentrate is returned to step S22 for a second scavenging.

[0026] In some embodiments, in step S24, the rougher concentrate is slurried to a slurry concentration of 10% to 20%.

[0027] In some embodiments, in step S24, the selected tailings and the primary scavenged concentrate obtained in step S22 are combined and returned to step S21 for roughing.

[0028] In some embodiments, in step S24, the selection includes at least two stages of selection, preferably three stages of selection.

[0029] In some embodiments, in steps S21, S22 and / or S23, the pH adjuster used to adjust the pH includes at least one of lime, sodium hydroxide or sodium carbonate.

[0030] In some embodiments, in step S1, the bismuth-sulfur ore includes a bismuth-sulfur coarse concentrate. Preferably, the bismuth content in the bismuth-sulfur coarse concentrate is 1-8 wt%, and the sulfur content is 20-35 wt%. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 1 is a schematic flow chart of a beneficiation method for bismuth sulfide ore according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic flow chart of the beneficiation method of bismuth sulfide ore in Example 1. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] like Figure 1 As shown, the beneficiation method of bismuth sulfide ore according to the embodiment of the present invention includes the following steps:

[0035] S1. Grinding: bismuth sulfide ore, quicklime and sodium sulfide are mixed and ground to obtain a slurry;

[0036] S2. Flotation: The slurry ground in step a is added to a flotation tank, the slurry concentration and pH are adjusted, sodium carbonate is added and stirred, and then a collector is added and aerated flotation is performed to obtain a bismuth concentrate.

[0037] In the beneficiation method of bismuth sulfide ore in the embodiment of the present invention, since bismuth sulfide ore easily adheres to a large amount of flotation reagents, the fresh surface generated during the grinding process is easily attached by the reagents in the subsequent flotation process. Quicklime and sodium sulfide are added during the grinding process. Quicklime can produce hydrophilic substances on the surface of the mineral after grinding to inhibit sulfur. Sodium sulfide can not only remove the reagents but also inhibit pyrite. During the mineral re-grinding process, the fresh surfaces of sulfide minerals such as pyrite and pyrrhotite react with quicklime and sodium sulfide to produce hydrophilic substances, thereby achieving an inhibitory effect. In the method of the embodiment of the present invention, the pH value of the slurry is adjusted, and the activator sodium carbonate is added to activate bismuth. Under the action of the collector, flotation is carried out to effectively inhibit pyrite. The method of the embodiment of the present invention does not require the addition of highly toxic sodium cyanide. Under the reagent system of the embodiment of the present invention, efficient beneficiation of bismuth sulfide ore with low bismuth grade can be achieved to obtain high-grade bismuth concentrate, achieving a beneficiation effect similar to that of using sodium cyanide. Moreover, the process of the embodiment of the present invention is simple, which is conducive to industrial application.

[0038] In some embodiments, in step S1, the grinding process to -0.074 mm accounts for 80% to 90%, preferably 85%.

[0039] In some embodiments, in step S1, the amount of quicklime added is 3000 g / t to 5000 g / t, preferably 4000 g / t; the amount of sodium sulfide added is 50 g / t to 150 g / t, preferably 100 g / t, based on the weight of the bismuth sulfide ore.

[0040] In some embodiments, in step S2, the flotation comprises the following steps:

[0041] S21. The ground slurry is added to the flotation tank, the slurry concentration is adjusted to 25% to 35%, preferably 33%, the pH is adjusted to 9.5 to 10.5, preferably 10, sodium carbonate, ethyl thiocyanate and 25# black medicine are added, and aeration flotation is performed for roughing to obtain a roughing concentrate and roughing tailings;

[0042] Preferably, the amount of sodium carbonate added is 700g / t to 900g / t, more preferably 800g / t; the amount of ethyl sulfide nitrogen added is 80g / t to 160g / t, more preferably 120g / t; the amount of 25# black medicine added is 80g / t to 160g / t, more preferably 120g / t, based on the weight of the bismuth sulfide ore.

[0043] S22. The pH of the rougher tailings obtained in step S21 is adjusted to 9.5 to 10.5, preferably 10, and sodium sulfide, sodium carbonate, ethyl dithiocarbamide and 25# black medicine are added, and aeration flotation is performed to perform a scavenging selection to obtain a scavenging concentrate and a scavenging tailings;

[0044] Preferably, the amount of sodium sulfide added is 30g / t~70g / t, preferably 50g / t; the amount of sodium carbonate added is 350g / t~450g / t, preferably 400g / t; the amount of ethyl thiocyanate added is 40g / t~80g / t, preferably 60g / t; the amount of 25# black medicine added is 40g / t~60g / t, preferably 60g / t, based on the weight of the roughing tailings.

[0045] S23. The pH of the primary scavenging tailings obtained in step S22 is adjusted to 9.5 to 10.5, preferably 10, and sodium carbonate, ethyl dithiocarbamide, and 25# black medicine are added, and secondary scavenging is performed by aeration flotation to obtain a secondary scavenging concentrate and a secondary scavenging tailings;

[0046] Preferably, the amount of sodium carbonate added is 300g / t to 400g / t, more preferably 200g / t; the amount of ethyl thiocyanate added is 20g / t to 40g / t, more preferably 30g / t; the amount of 25# black medicine added is 30g / t to 50g / t, more preferably 40g / t, based on the weight of the primary scavenging tailings;

[0047] Preferably, the secondary scavenged concentrate is returned to step S22 for a second scavenging.

[0048] S24. The rougher concentrate obtained in step S21 is slurried to a pulp concentration of 10% to 20%, and then concentrated to obtain a concentrated concentrate and a concentrated tailings;

[0049] Preferably, the selected tailings and the primary scavenged concentrate obtained in step S22 are combined and returned to step S21 for roughing.

[0050] Preferably, the concentrating comprises at least two stages of concentrating, preferably three stages of concentrating.

[0051] In the embodiments of the present invention, quicklime and sodium sulfide are added to the mill. The sodium sulfide not only removes the sulfide but also effectively inhibits pyrite. During the regrinding process, the fresh surfaces of sulfide minerals such as pyrite and pyrrhotite react with quicklime and sodium sulfide to produce hydrophilic substances, thereby achieving the inhibitory effect. By strictly controlling the pH value of the flotation slurry between 9.5 and 10.5, sulfide minerals such as pyrite and pyrrhotite are further inhibited. Sodium carbonate is used to activate metallic bismuth, while the highly selective 25# black powder is used to capture metallic bismuth. Bismuth encapsulated by galena is captured using ethyl thiocyanate. The combined use of 25# black powder and ethyl thiocyanate effectively improves the beneficiation efficiency of bismuth sulfide ore. Through primary roughing, secondary scavenging, and tertiary concentrating, bismuth can be effectively recovered from low-grade bismuth sulfide ore, yielding a bismuth concentrate with a grade exceeding 20%.

[0052] In some embodiments, in steps S21, S22 and / or S23, the pH adjuster used to adjust the pH includes at least one of lime, sodium hydroxide or sodium carbonate.

[0053] In some embodiments, in step S1, the bismuth-sulfur ore includes a bismuth-sulfur coarse concentrate. Preferably, the bismuth content in the bismuth-sulfur coarse concentrate is 1-8 wt%, and the sulfur content is 20-35 wt%.

[0054] The present invention will be described in detail below with reference to the embodiments and accompanying drawings.

[0055] Example 1

[0056] like Figure 2As shown, a bismuth-sulfur coarse concentrate in Yunnan was beneficiated, and the bismuth content in the bismuth-sulfur coarse concentrate was 4.02wt% and the sulfur content was 23.38wt%.

[0057] Grinding: Add bismuth sulfur coarse concentrate, 4000g / t quicklime and 100g / t sodium sulfide into the mill, grind to a fineness of -0.074mm, accounting for 85% based on the weight of the bismuth sulfur coarse concentrate, and obtain slurry.

[0058] Roughing: Add the ground pulp to the flotation tank and adjust the pulp to a concentration of 20%. Add pH adjuster calcium oxide to adjust the pH to 10. Add 800g / t sodium carbonate, 120g / t ethyl thiocyanate collector and 120g / t 25# black medicine, based on the weight of the bismuth sulfur crude concentrate. Stir thoroughly. After slurrying for 5 minutes, perform roughing operation by aeration flotation to obtain roughing concentrate and roughing tailings.

[0059] Primary scavenging: Add pH adjuster calcium oxide to the roughing tailings to adjust the slurry to pH 10, add 50g / t sodium sulfide, 400g / t sodium carbonate, 60g / t 25# black medicine and 60g / t ethyl dithiocarbamide, based on the weight of the roughing tailings. After slurry adjustment for five minutes, aerate and float to obtain scavenging concentrate and scavenging tailings. The scavenging concentrate returns to the previous roughing operation to form a closed loop.

[0060] Secondary scavenging: Add pH adjuster calcium oxide to the scavenging tailings to adjust the slurry to pH 10, and add 300g / t sodium carbonate, 40g / t 25# black medicine and 30g / t ethyl dithiocarbamide in sequence. Based on the weight of the scavenging tailings, flotation is performed to obtain the scavenging concentrate and scavenging tailings. The scavenging concentrate is returned to the previous scavenging operation to form a closed loop.

[0061] Concentration: The rougher concentrate obtained from roughing is slurried to a concentration of 20%, and three stages of concentration are carried out to obtain concentrated concentrate and concentrated tailings. The concentrated tailings are returned to the previous operation one by one to form a closed loop.

[0062] The bismuth grade of the concentrated bismuth concentrate obtained in this embodiment is 23.36%, and the bismuth recovery rate is 85.41%. The sulfur grade of the tailings obtained by the secondary scavenging is 24.58%, and the sulfur recovery rate is 89.68%. The test indicators are relatively ideal.

[0063] Example 2

[0064] The method is the same as that of Example 1, except that different bismuth sulfur coarse concentrate and specific flotation parameters are used.

[0065] The details are as follows:

[0066] In the bismuth-sulfur coarse concentrate of this embodiment, the bismuth content is 1.27wt% and the sulfur content is 31.15wt%;

[0067] In the grinding step, the amount of quicklime added is 4500g / t, the amount of sodium sulfide added is 130g / t, and the ore is ground to a fineness of -0.074mm, accounting for 90%;

[0068] In the roughing process, the addition amount of sodium carbonate is 900g / t, the addition amount of 25# black powder is 150g / t, and the addition amount of ethyl thiocyanate is 150g / t;

[0069] In one sweep, the amount of sodium sulfide added is 60g / t, the amount of sodium carbonate added is 450g / t, the amount of 25# black medicine added is 80g / t, and the amount of ethyl thiocyanate added is 80g / t;

[0070] During the secondary scavenging, the amount of sodium carbonate added is 400g / t, the amount of 25# black medicine added is 50g / t, and the amount of ethyl thiocyanate added is 40g / t.

[0071] The bismuth grade of the concentrated bismuth concentrate obtained in this embodiment is 35.06%, and the bismuth recovery rate is 91.82%; the sulfur grade of the tailings obtained by the secondary scavenging is 31.69%, and the sulfur recovery rate is 98.38%. The test indicators are relatively ideal.

[0072] Comparative Example 1

[0073] The method was the same as in Example 1, except that quicklime and sodium sulfide were not added during the grinding process, and sodium cyanide was substituted for sodium carbonate in the roughing, primary scavenging, and secondary scavenging operations. The sodium cyanide addition amount was 70 g / t in the roughing, 40 g / t in the primary scavenging, and 20 g / t in the secondary scavenging.

[0074] The bismuth grade of the concentrated bismuth concentrate obtained in this comparative example is 24.48%, and the bismuth recovery rate is 76.12%; the sulfur grade of the tailings obtained by the secondary scavenging is 24.38%, and the sulfur recovery rate is 91.26%.

[0075] It can be seen from the mineral processing results of Example 1 and Comparative Example 1 that the test indicators obtained by the method of the embodiment of the present invention are basically consistent with those obtained by using sodium cyanide. The method of the embodiment of the present invention can successfully suppress sulfur in the tailings and avoid the use of cyanide.

[0076] Comparative Example 2

[0077] The method is the same as that of Example 1, except that quicklime and sodium sulfide are not added during the grinding process.

[0078] The bismuth grade of the concentrated bismuth concentrate obtained in this comparative example is 5.38%, and the bismuth recovery rate is 40.00%. The sulfur grade of the tailings obtained by the secondary scavenging is 18.42%, and the sulfur recovery rate is 55.24%.

[0079] It can be seen from the beneficiation results of Example 1 and Comparative Example 2 that in Comparative Example 2, since quicklime and sodium sulfide according to the embodiment of the present invention are not added during grinding, sulfide minerals cannot be effectively suppressed, resulting in low bismuth grade and recovery rate in the bismuth concentrate.

[0080] Comparative Example 3

[0081] The method is the same as that of Example 1, except that only quicklime is added during the grinding process, and sodium sulfide is not added.

[0082] The bismuth grade of the concentrated bismuth concentrate obtained in this comparative example is 8.37%, and the bismuth recovery rate is 56.21%. The sulfur grade of the tailings obtained by the secondary scavenging is 19.47%, and the sulfur recovery rate is 60.79%.

[0083] In this comparative example, since no sodium sulfide was added, the reagent adsorbed on the mineral surface during the flotation process could not be effectively desorbed, and the addition of limestone alone could not effectively inhibit pyrite, resulting in poor bismuth-sulfur separation effect.

[0084] Comparative Example 4

[0085] The method is the same as that of Example 1, except that quicklime is not added during the grinding process, but only sodium sulfide is added.

[0086] The bismuth grade of the concentrated bismuth concentrate obtained in this comparative example is 10.26%, and the bismuth recovery rate is 68.32%; the sulfur grade of the tailings obtained by the secondary scavenging is 22.49%, and the sulfur recovery rate is 70.44%.

[0087] In this comparative example, since quicklime was not added, the grade and recovery rate of bismuth in the bismuth concentrate were lower than those in Example 1. This was because the fresh surface generated during the grinding process failed to effectively form hydrophilic substances, resulting in difficulty in flotation separation.

[0088] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0089] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A beneficiation method for bismuth sulfide ore, characterized in that: The steps include: S1. Grinding: bismuth sulfide ore, quicklime and sodium sulfide are mixed and ground to obtain a slurry; S2. Flotation: The slurry ground in step a is added to a flotation tank, the slurry concentration and pH are adjusted, sodium carbonate is added and stirred, and then a collector is added and aerated flotation is performed to obtain a bismuth concentrate.

2. The beneficiation method of bismuth sulfide ore according to claim 1, characterized in that: In step S1, the grinding treatment to -0.074 mm accounts for 80% to 90%, preferably 85%; and / or, the quicklime is added in an amount of 3000 g / t to 5000 g / t, preferably 4000 g / t, based on the weight of the bismuth sulfide ore; And / or, the amount of sodium sulfide added is 50 g / t to 150 g / t, preferably 100 g / t, based on the weight of the bismuth sulfide ore.

3. The beneficiation method of bismuth sulfide ore according to claim 1, characterized in that: In step S2, the flotation comprises the following steps: S21. The ground slurry was added to the flotation tank, the slurry concentration and pH were adjusted, sodium carbonate, ethyl thiocyanate and 25# black medicine were added, and aeration flotation was performed for roughing to obtain roughing concentrate and roughing tailings; S22. The pH of the roughing tailings obtained in step S21 is adjusted, sodium sulfide, sodium carbonate, ethyl disulfide and 25# black medicine are added, and aeration flotation is performed once to obtain a scavenging concentrate and a scavenging tailings; S23. The pH of the primary scavenging tailings obtained in step S22 is adjusted, sodium carbonate, ethyl thiocyanate, and 25# black medicine are added, and secondary scavenging is performed by aeration flotation to obtain a secondary scavenging concentrate and a secondary scavenging tailings; S24. The rougher concentrate obtained in step S21 is slurried and concentrated to obtain concentrated concentrate and concentrated tailings.

4. The beneficiation method of bismuth sulfide ore according to claim 3, characterized in that: In step S21, the slurry concentration after slurry adjustment is 25% to 35%, preferably 33%; and / or, said adjusting the pH value to 9.5 to 10.5, preferably 10; and / or, the amount of sodium carbonate added is 700 g / t to 900 g / t, preferably 800 g / t, based on the weight of the bismuth sulfide ore; and / or, the amount of ethyl sulfide and nitrogen added is 80 g / t to 160 g / t, preferably 120 g / t, based on the weight of the bismuth sulfide ore; And / or, the amount of 25# black medicine added is 80g / t to 160g / t, preferably 120g / t, based on the weight of the bismuth sulfide ore.

5. The beneficiation method of bismuth sulfide ore according to claim 3, characterized in that: In the step S22, the pH of the rougher tailings is adjusted to 9.5 to 10.5, preferably 10; and / or, the amount of sodium sulfide added is 30 g / t to 70 g / t, preferably 50 g / t, based on the weight of the rougher tailings; and / or, the amount of sodium carbonate added is 350 g / t to 450 g / t, preferably 400 g / t, based on the weight of the rougher tailings; and / or, the amount of ethyl sulfide and nitrogen added is 40 g / t to 80 g / t, preferably 60 g / t, based on the weight of the rougher tailings; And / or, the amount of 25# black medicine added is 40g / t to 60g / t, preferably 60g / t, based on the weight of the rougher tailings.

6. The beneficiation method of bismuth sulfide ore according to claim 3, characterized in that: In the step S23, the pH of the primary scavenging tailings is adjusted to 9.5 to 10.5, preferably 10; and / or, the amount of sodium carbonate added is 300 g / t to 400 g / t, preferably 200 g / t, based on the weight of the primary scavenged tailings; and / or, the amount of ethyl thiocyanate added is 20 g / t to 40 g / t, preferably 30 g / t, based on the weight of the primary scavenging tailings; And / or, the addition amount of the 25# black powder is 30g / t to 50g / t, preferably 40g / t, based on the weight of the tailings of the first sweep; And / or, the secondary scavenged concentrate is returned to step S22 for a second scavenging.

7. The beneficiation method of bismuth sulfide ore according to claim 3, characterized in that: In step S24, the rougher concentrate is slurried to a slurry concentration of 10% to 20%; And / or, the selected tailings and the primary scavenged concentrate obtained in step S22 are combined and returned to step S21 for roughing.

8. The beneficiation method of bismuth sulfide ore according to claim 3, characterized in that: In step S24, the selection includes at least two stages of selection, preferably three stages of selection.

9. The beneficiation method of bismuth sulfide ore according to claim 3, characterized in that: In the steps S21, S22 and / or S23, the pH adjuster used to adjust the pH includes at least one of lime, sodium hydroxide or sodium carbonate.

10. The beneficiation method of bismuth sulfide ore according to claim 1, characterized in that: In the step S1, the bismuth-sulfur ore includes a bismuth-sulfur coarse concentrate. Preferably, the bismuth content in the bismuth-sulfur coarse concentrate is 1-8 wt%, and the sulfur content is 20-35 wt%.

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