A high-sulfur antimony ore flotation separation process, combined depressor and application

Abstract

The application discloses a high-sulfur stibnite flotation separation process, a combined inhibitor and application, and the combined inhibitor is composed of sodium mercaptoacetate and carboxymethyl cellulose with a mass ratio of (0.1-0.3):1. The application adopts step-by-step inhibition, and different inhibitors are used in roughing and cleaning, so that the grade and recovery rate of antimony concentrate can be ensured, and the recovery of pyrite in subsequent operation and the S content in subsequent beneficiation products can also be ensured. The combined inhibitor has the advantages of strong effect, strong adaptability, strong stability and small dosage, and can realize efficient flotation separation of stibnite and pyrite and realize recovery and utilization of stibnite and pyrite.

Description

Technical Field

[0001] This invention relates to the field of antimony-sulfur mineral flotation technology, specifically a flotation separation process, combined depressant, and application of high-sulfur stibnite, particularly a beneficiation method for stibnite with high pyrite content and slightly oxidized surface. Background Technology

[0002] When processing relatively simple sulfur-bearing stibnite ores, preferential flotation and mixed flotation followed by separation flotation processes are commonly used, both of which can achieve good beneficiation results. However, with the increasing mining of easily beneficiated ores, complex and difficult-to-beneficiate ores have become the focus of current beneficiation research. Therefore, conventional preferential flotation and mixed flotation followed by separation processes have many drawbacks. First, conventional preferential flotation processes require strong suppression of pyrite in ores with high pyrite content, making it difficult to recover pyrite from subsequent tailings. When the raw ore contains multiple useful minerals (including metallic minerals, non-metallic minerals, and oxide minerals), strong suppression of pyrite may lead to excessive sulfur content in subsequent non-metallic mineral products or oxide mineral products.

[0003] Furthermore, the mixed flotation and re-separation process is particularly disadvantageous for raw ores with high pyrite content and low stibnite content. Mixed flotation leads to a greater difference in the S / Sb ratio, making antimony-sulfur separation difficult and resulting in a low yield of qualified stibnite products. Patent CN106955792B discloses a flotation separation process for antimony-sulfur mixed concentrate and a combined depressant. The combined depressant includes dimercaptosuccinic acid and sodium hydrosulfide in a mass ratio of 1:1 to 1:2. This patent first floats antimony and sulfur to obtain an antimony-sulfur mixed concentrate, then uses a strong pyrite depressant to obtain an antimony concentrate, effectively separating antimony and sulfur. However, the depressant's effect is too strong, resulting in poor stability during adjustment, mainly manifested in large fluctuations in experimental data between different batches under the same experimental conditions.

[0004] Patent CN106955792B discloses an embodiment three in which CMC is used to replace the combined inhibitors in embodiments one and two. In embodiment three of this patent, a zinc-sulfur mixed concentrate is first obtained by flotation of antimony and sulfur, and then CMC is added in the roughing stage. After the antimony and sulfur have floated to the surface, CMC is added for roughing. The inhibitory effect of CMC is not strong and cannot separate antimony from pyrite. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a flotation separation process, combined inhibitor and application for high-sulfur stibnite, which addresses the shortcomings of the existing technology. The flotation process has good stability, enables good separation of antimony and pyrite, and is also conducive to the subsequent recovery of pyrite and other useful minerals.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The present invention discloses a combined inhibitor for the flotation separation of high-sulfur stibnite, which is composed of sodium mercaptoacetate and carboxymethyl cellulose in a mass ratio of (0.1-0.3):1.

[0007] Stibnite exhibits good floatability under neutral and acidic conditions, but is easily suppressed, or even completely fails to float, under alkaline conditions. Most pyrite depressants require highly alkaline conditions to achieve good results. Therefore, finding a depressant that effectively suppresses pyrite under neutral or even weakly acidic conditions without affecting stibnite flotation is crucial for the effective recovery and utilization of stibnite. The combined depressant of this invention has a strong inhibitory effect and is weakly alkaline, making it suitable for the second step of a step-by-step inhibition process. If the inhibitory effect is too strong, it will affect stability and recovery rate. If the inhibitory effect is too weak, it will not be able to fully separate stibnite and pyrite.

[0008] This invention also discloses a flotation separation process for high-sulfur stibnite, comprising the following steps:

[0009] S1. Grinding: Crushing and grinding the raw ore;

[0010] S2. The raw ore obtained from S1 is slurry adjusted to obtain roughing slurry. Inhibitors, activators, collectors and frothers are added to the roughing slurry to make antimony and some pyrite float to the surface, and antimony-sulfur mixed concentrate and primary rough tailings are obtained.

[0011] S3. Add a combination inhibitor to the antimony-sulfur mixed concentrate, then add a collector and a frother, stir evenly, and then flotate to obtain a rough concentrate and secondary rough tailings.

[0012] S4. Add a combination inhibitor to the rough concentrate and refine it 2-3 times to obtain refined concentrate, which is used as antimony concentrate.

[0013] Among them, the Sb content in the stibnite ore in the raw ore is not less than 1.2%, and the sulfur content is not less than 8%.

[0014] Stepwise suppression-preferred flotation involves adding a weak pyrite depressant during roughing to suppress some pyrite, allowing stibnite and a portion of pyrite to float, resulting in a mixed antimony-sulfur concentrate. The partially suppressed pyrite can float well in subsequent pyrite flotation with only a small amount of activator. Since the pyrite in the mixed antimony-sulfur concentrate has already been suppressed during roughing, it is more easily suppressed during cleaning and separation, facilitating antimony-sulfur separation. Therefore, stepwise suppression-preferred flotation effectively solves the problems existing in traditional preferential flotation and mixed flotation separation processes, achieving good separation of antimony and pyrite, and also facilitating subsequent pyrite recovery.

[0015] Furthermore, the dosage of the combined inhibitor in S3 is 50-100 g / t, and the dosage in S4 is 1-30 g / t. Even further, the dosage of the combined inhibitor in S3 is 70-100 g / t, and the dosage in S4 is 10-30 g / t; still further, the dosage of the combined inhibitor in S3 is 80-90 g / t, and the dosage in S4 is 20-30 g / t. The dosage of the combined inhibitor within this range can achieve high grades and recovery rates of antimony and sulfur, which is beneficial for the subsequent recovery of fluorite.

[0016] Furthermore, the inhibitor in S2 is carboxymethyl cellulose, used at a dosage of 300~600 g / t. This dosage range of carboxymethyl cellulose is sufficient to cause antimony and some pyrite to float, meaning it only inhibits the flotation of some pyrite.

[0017] Furthermore, the secondary coarse tailings obtained from S3 are scavenged 1-2 times with a collector, and the scavenged tailings are sulfur concentrate.

[0018] Furthermore, the primary rough tailings obtained from S2 are scavenged by adding collectors and frothers. The bottom product of the scavenged tailings is the tailings, and the scavenging is performed twice. The concentrate in the primary rough tailings is further recovered through scavenging.

[0019] Furthermore, the tailings are subjected to flotation to obtain fluorite. This invention employs a combination of a weak inhibitor and a stronger inhibitor, which is beneficial for fluorite flotation, improving its grade and recovery rate.

[0020] Furthermore, sodium carbonate is used for pulp conditioning in S2, with a dosage of 800~2400g / t of raw ore, and the pH value of the roughing pulp is 5~7.

[0021] Furthermore, the activator is lead nitrate, and the dosage is 100~300g / t of raw ore.

[0022] Furthermore, the collector is ethyl thiocyanate, with a dosage of 3~30 g / t of raw ore; the frother is methyl isobutyl methanol, with a dosage of 5~30 g / t of raw ore.

[0023] The present invention also discloses the application of the aforementioned combined inhibitor in the flotation separation of high-sulfur stibnite, wherein a layer of oxide film covers the surface of some stibnite.

[0024] Slightly oxidized antimony is quickly suppressed, resulting in low recovery rates. This invention is particularly advantageous for slightly oxidized ore; by suppressing oxidation in stages, the recovery rate of slightly oxidized antimony can be improved.

[0025] The specific steps of this invention are as follows:

[0026] 1) Obtain antimony-sulfur mixed concentrate by preferential flotation

[0027] a. Grinding: Crush and grind the raw ore to a fineness of -200 mesh, accounting for 65%~75%;

[0028] b. Roughing: First, add 800-2400 g / t of sodium carbonate to adjust the slurry pH to 6-7. Then, add 300-600 g / t of sodium carbonate as a pyrite depressant; 100-300 g / t of lead nitrate as an activator; 10-30 g / t of ethyl thiocyanate as a collector; and 10-30 g / t of methyl isobutyl methanol (MIBC) as a frother. After stirring evenly, antimony and some pyrite will float to the surface, obtaining antimony-sulfur mixed concentrate and rough tailings.

[0029] c. Scavenging: Add 5-15 g / t of ethyl thiocyanate and 5-15 g / t of methyl isobutyl methanol (MIBC) to scavenger the coarse tailings twice. The bottom product of the scavenging tank is the tailings, and the scavenging concentrate is returned to the previous operation.

[0030] (2) Separation of antimony-sulfur mixed concentrate

[0031] For the antimony-sulfur mixed concentrate obtained by preferential flotation, antimony-sulfur separation flotation is performed:

[0032] a. Roughing: First, add 50-100g / t of mixed inhibitor as a pyrite inhibitor; 5-20g / t of ethyl thiocyanate as a collector; and 5-10g / t of methyl isobutyl methanol (MIBC) as a frother. After stirring evenly, carry out one roughing process to obtain rough concentrate and rough tailings by flotation.

[0033] b. Scavenging: Add 3-8 g / t of ethyl nitrogen each time to scaveng the coarse tailings 1-2 times. The scavenged tailings are used as sulfur concentrate. The scavenged concentrate is returned to the previous operation.

[0034] c. Fine refining: Add 0~30g / t of combined inhibitor each time to fine refining the rough concentrate 2~3 times. The finely refined concentrate is used as antimony concentrate. The finely refined ore is returned to the previous stage of operation in sequence.

[0035] The amount of reagent added is calculated per ton of raw ore.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] 1. This invention uses a stepwise suppression-preferential flotation approach followed by separation of antimony-sulfur mixed concentrate, which ensures the grade and recovery rate of antimony concentrate.

[0038] 2. This invention uses stepwise suppression preferential flotation. The pyrite that is suppressed in the tailings can float well in the subsequent pyrite flotation with the addition of a small amount of activator, which provides favorable conditions for the flotation of pyrite.

[0039] 3. Pyrite in antimony-sulfur mixed concentrate has already been treated with inhibitors during roughing. During cleaning and separation, pyrite is more easily suppressed by the combined inhibitors, which is beneficial for antimony-sulfur separation.

[0040] 4. The combined inhibitor used in the separation of antimony-sulfur mixed concentrate consists of sodium mercaptoacetate and carboxymethyl cellulose (CMC) in a mass ratio of (0.1~0.3):1. It combines their advantages, has a strong inhibitory effect on pyrite, and requires a small amount. Attached Figure Description

[0041] Figure 1 This is a flow chart of the high-sulfur stibnite flotation separation process of the present invention.

[0042] Figure 2 This is a flow chart of the high-sulfur stibnite flotation separation process in Embodiment 1 of the present invention.

[0043] Figure 3 This is a flow chart of the high-sulfur stibnite flotation separation process in Embodiment 2 of the present invention. Detailed Implementation

[0044] The following examples are intended to further illustrate the present invention, but not to limit it. The g / t mentioned in this application refers to the mass of the reagent added per ton of raw ore. All percentage contents are mass percentages.

[0045] Example 1:

[0046] Using the process and combined inhibitors of this invention, flotation tests were conducted on high-sulfur stibnite ore from a certain region (the raw ore contained 1.33% Sb and 10.88% S; the pulp after grinding was weakly acidic at approximately pH 5.5; process mineralogical studies showed that some stibnite and pyrite were covered with an oxide film, indicating a slightly oxidized state). The specific experimental steps are as follows:

[0047] (1) The raw ore is crushed and ground to a fineness of -200 mesh (65%); sodium carbonate is added at 2000 g / t for slurry preparation. Then, 400 g / t of carboxymethyl cellulose (CMC) is added as an inhibitor for pyrite; 150 g / t of lead nitrate is added as an activator; 20 g / t of ethyl thiocyanate is added as a collector; and 20 g / t of methyl isobutyl methanol (MIBC) is added as a foaming agent. After stirring evenly, antimony and some pyrite are floated to obtain antimony-sulfur mixed concentrate and coarse tailings. The coarse tailings are scavenged twice. In scavenging 1, 10 g / t of ethyl thiocyanate and 5 g / t of methyl isobutyl methanol (MIBC) are added. In scavenging 2, 5 g / t of ethyl thiocyanate is added. The bottom product of the scavenging tank is the tailings. The scavenging concentrate is returned to the previous operation in sequence.

[0048] (2) For the antimony-sulfur mixed concentrate obtained by preferential flotation, antimony-sulfur separation flotation is carried out. 80 g / t of combined depressant is added as a depressant for pyrite; 8 g / t of ethyl thiocyanate is added as a collector; and 10 g / t of methyl isobutyl methanol (MIBC) is added as a frother. After stirring evenly, a roughing flotation is carried out to obtain rough concentrate and rough tailings. The rough tailings are then subjected to a scavenging flotation with 3 g / t of ethyl thiocyanate added. The scavenged tailings are used as sulfur concentrate, and the scavenged concentrate is returned to the previous stage operation. The rough concentrate is then subjected to two cleaning flotation processes. In cleaning process 1, 20 g / t of combined depressant is added, and in cleaning process 2, 10 g / t of combined depressant is added. The cleaned concentrate is used as antimony concentrate, and the cleaned concentrate is returned to the previous stage operation. The combined depressant consists of sodium mercaptoacetate and carboxymethyl cellulose (CMC) in a mass ratio of 0.2:1.

[0049] The flotation separation process of high-sulfur stibnite in Example 1 is shown below. Figure 2 To demonstrate the superiority of the process and combination inhibitors of this invention, two sets of comparative experiments were conducted, and the results are shown in Table 1.

[0050] The experimental results show that, using the process and inhibitor disclosed in this invention, a small-scale closed-circuit laboratory test can obtain an antimony concentrate with an Sb grade of 46.35% and a recovery rate of 86.86%, and a sulfur concentrate with an S grade of 46.32% and a recovery rate of 26.11%. Comparative Example 1, using the inhibitor and process disclosed in patent CN106955792B, resulted in a 5.63% reduction in the antimony concentrate recovery rate. Comparative Example 2, conducted by reducing the dosage of the combined inhibitor, showed a larger decrease in the grade of the refined concentrate, but the antimony recovery rate remained low at 82.90%. This indicates that the process and combined inhibitor used in this invention are beneficial for antimony recovery from ore with slight oxidation. The inhibitor and process disclosed in patent CN106955792B have poor adjustment stability.

[0051] Table 1. Results of Example 1 and its comparative experiments / %

[0052]

[0053] Example 2:

[0054] Using the process and combined inhibitors of this invention, flotation tests were conducted on high-sulfur stibnite ore (with a raw ore content of 1.72% Sb, 9.48% S, and 26.37% CaF2) from a certain location. The specific test steps are as follows:

[0055] (1) The raw ore is crushed and ground to a fineness of -200 mesh (72%); sodium carbonate is added at 1600 g / t for slurry preparation. Then, 600 g / t of carboxymethyl cellulose (CMC) is added as an inhibitor for pyrite; 200 g / t of lead nitrate is added as an activator; 20 g / t of ethyl thiocyanate is added as a collector; and 30 g / t of methyl isobutyl methanol (MIBC) is added as a foaming agent. After stirring evenly, antimony and some pyrite are floated to obtain antimony-sulfur mixed concentrate and coarse tailings. The coarse tailings are scavenged twice. In scavenging 1, 10 g / t of ethyl thiocyanate and 5 g / t of methyl isobutyl methanol (MIBC) are added. In scavenging 2, 5 g / t of ethyl thiocyanate is added. The bottom product of the scavenging tank is the tailings. The scavenging concentrate is returned to the previous operation in sequence.

[0056] (2) For the antimony-sulfur mixed concentrate obtained by preferential flotation, antimony-sulfur separation flotation is carried out. 100 g / t of combined depressant is added as a depressant for pyrite; 12 g / t of ethyl thiocyanate is added as a collector; and 10 g / t of methyl isobutyl methanol (MIBC) is added as a frother. After stirring evenly, a roughing flotation is carried out to obtain rough concentrate and rough tailings. The rough tailings are then subjected to a scavenging flotation with 4 g / t of ethyl thiocyanate added. The scavenged tailings are used as sulfur concentrate, and the scavenged concentrate is returned to the previous stage. The rough concentrate is then subjected to three cleaning flotation processes. 20 g / t of combined depressant is added for cleaning process 1, 10 g / t of combined depressant is added for cleaning process 2, and no depressant is added for cleaning process 3. The cleaned concentrate is used as antimony concentrate, and the cleaned ore is returned to the previous stage. The combined depressant consists of sodium mercaptoacetate and carboxymethyl cellulose (CMC) in a mass ratio of 0.1:1.

[0057] (3) For the tailings obtained by preferential flotation, pyrite flotation is carried out, with 200 g / t of copper sulfate added as an activator for pyrite; 80 g / t of butyl xanthate is added as a collector, 2 # 20g / t of oil was used as a frother, and after thorough mixing, a roughing flotation was performed to obtain a rough concentrate and rough tailings. The rough tailings were then subjected to two scavenging processes: scavenging step 1 involved adding 40g / t of xanthate, and step 2... # Oil 10g / t, scavenging 2 with 20g / t of butyl xanthate, scavenging tailings as tailings, scavenging concentrate returned to the previous stage operation; rough concentrate is cleaned twice, cleaned concentrate is used as antimony concentrate, cleaned middlings returned to the previous stage operation.

[0058] (4) Fluorite flotation is carried out on the tailings obtained from pyrite flotation. After one roughing, three scavenging and seven cleaning processes, fluorite concentrate is obtained. The middlings from each operation are returned in sequence. For fluorite roughing, add 400 g / t of combined inhibitor (a mixed reagent prepared by mixing sulfuric acid, water glass, and tannin in a mass ratio of 3:5:1) and 800 g / t of oleic acid, stirring for 2 min each time, with a flotation time of 4 min. For fluorite concentrate cleaning, add combined inhibitor for the first, third, and fifth cleaning processes at amounts of 300 g / t, 200 g / t, and 100 g / t respectively. Add water glass for the second, fourth, and sixth cleaning processes at amounts of 200 g / t, 100 g / t, and 100 g / t respectively, stirring for 1 min each time, with a flotation time of 2.5 min. For fluorite scavenging, add 150 g / t and 100 g / t of oleic acid sequentially during the first and second scavenging processes, stirring for 1 min each time, with a flotation time of 2.5 min each time.

[0059] Comparative Example 3

[0060] The inhibitor disclosed in patent CN106955792B was used as the inhibitor for conventional stibnite preferential flotation. The flotation processes and reagent regimes for pyrite and fluorite were the same as in Example 2, specifically:

[0061] Using the process and combined inhibitors of this invention, flotation tests were conducted on high-sulfur stibnite ore (with a raw ore content of 1.72% Sb, 9.48% S, and 26.37% CaF2) from a certain location. The specific test steps are as follows:

[0062] (1) The raw ore is crushed and ground to a fineness of -200 mesh (72%). Sodium carbonate is added at 1600 g / t for slurry preparation. Then, dimercaptosuccinic acid and sodium hydrosulfide at a mass ratio of 1:1 (1:1) are added at 150 g / t as inhibitors for pyrite; lead nitrate at 200 g / t is used as an activator; ethyl thiocyanate at 20 g / t is used as a collector; and methyl isobutyl methanol (MIBC) at 30 g / t is used as a frother. After stirring evenly, antimony and some pyrite float to the surface to obtain antimony rough concentrate and rough tailings. The rough tailings are scavenged twice. In scavenging 1, ethyl thiocyanate at 10 g / t and methyl isobutyl methanol (MIBC) at 5 g / t are added. In scavenging 2, ethyl thiocyanate at 5 g / t is added. The bottom product of the scavenging tank is the tailings. The scavenged concentrate is returned to the previous operation.

[0063] (2) The antimony rough concentrate obtained by preferential flotation is further refined. The rough concentrate is refined three times. 20 g / t of combined inhibitor is added to refinement 1, 10 g / t of combined inhibitor is added to refinement 2, and no inhibitor is added to refinement 3. The refined concentrate is used as the antimony concentrate, and the ore in the refinement is returned to the previous stage in sequence. The combined inhibitor is composed of dimercaptosuccinic acid and sodium hydrosulfide in a mass ratio of 1:1.

[0064] (3) For the tailings obtained by preferential flotation, pyrite flotation is carried out, with 200 g / t of copper sulfate added as an activator for pyrite; 80 g / t of butyl xanthate is added as a collector, 2 # 20g / t of oil was used as a frother, and after thorough mixing, a roughing flotation was performed to obtain a rough concentrate and rough tailings. The rough tailings were then subjected to two scavenging processes: scavenging step 1 involved adding 40g / t of xanthate, and step 2... # Oil 10g / t, scavenging 2 with 20g / t of butyl xanthate, scavenging tailings as tailings, scavenging concentrate returned to the previous stage operation; rough concentrate is cleaned twice, cleaned concentrate is used as antimony concentrate, cleaned middlings returned to the previous stage operation.

[0065] (4) Fluorite flotation is carried out on the tailings obtained from pyrite flotation. After one roughing, three scavenging and seven cleaning processes, fluorite concentrate is obtained. The middlings from each operation are returned in sequence. For fluorite roughing, add 400 g / t of combined inhibitor (a mixed reagent prepared by mixing sulfuric acid, water glass, and tannin in a mass ratio of 3:5:1) and 800 g / t of oleic acid, stirring for 2 min each time, with a flotation time of 4 min. For fluorite concentrate cleaning, add combined inhibitor for the first, third, and fifth cleaning processes at amounts of 300 g / t, 200 g / t, and 100 g / t respectively. Add water glass for the second, fourth, and sixth cleaning processes at amounts of 200 g / t, 100 g / t, and 100 g / t respectively, stirring for 1 min each time, with a flotation time of 2.5 min. For fluorite scavenging, add 150 g / t and 100 g / t of oleic acid sequentially during the first and second scavenging processes, stirring for 1 min each time, with a flotation time of 2.5 min each time.

[0066] Example 2: The flotation separation process of high-sulfur stibnite is shown below. Figure 3 To clarify the impact of stepwise suppression preferential flotation and conventional preferential flotation of stibnite on subsequent operations, stepwise suppression preferential flotation-pyrite flotation-fluorite flotation and conventional preferential flotation-stibnite-pyrite flotation-fluorite flotation tests were conducted. The test results are shown in Table 2.

[0067] The experimental results show that, using the process and combined inhibitor disclosed in this invention, a small-scale closed-circuit laboratory test can obtain antimony concentrate with an Sb grade of 45.83% and a recovery rate of 92.29%, and sulfur concentrate with an S grade of 47.72% and a recovery rate of 34.32%. Good indicators can be obtained in both pyrite and fluorite flotation of the flotation tailings. Using the combined inhibitor disclosed in patent CN106955792B as an inhibitor for conventional stibnite preferential flotation, the antimony concentrate grade and recovery rate are not significantly different from those in Example 2. However, in pyrite flotation, the S recovery rate is low, and a large amount of S consumes a large amount of fluorite collector during fluorite flotation, resulting in a significant decrease in fluorite flotation recovery rate.

[0068] Table 2. Experimental Results of Example 2 / %

[0069] .

Claims

1. A flotation separation process for high-sulfur stibnite, characterized in that... Includes the following steps: S1. Grinding: Crushing and grinding the raw ore; S2. The raw ore obtained from S1 is slurry adjusted to obtain roughing slurry. Inhibitors, activators, collectors and frothers are added to the roughing slurry to make antimony and some pyrite float to the surface, and antimony-sulfur mixed concentrate and primary rough tailings are obtained. S3. Add a combination inhibitor to the antimony-sulfur mixed concentrate, then add a collector and a frother, stir evenly, and then flotate to obtain a rough concentrate and secondary rough tailings. S4. Add a combination inhibitor to the rough concentrate and refine it 2-3 times to obtain refined concentrate, which is used as antimony concentrate. The raw stibnite ore contains no less than 1.2% Sb and no less than 8% sulfur. The combined inhibitor consists of sodium mercaptoacetate and carboxymethyl cellulose in a mass ratio of (0.1-0.3):

1.

2. The flotation separation process for high-sulfur stibnite according to claim 1, characterized in that, The dosage of the combined inhibitor in S3 is 50-100 g / t, and the dosage of the combined inhibitor in S4 is 1-30 g / t.

3. The flotation separation process for high-sulfur stibnite according to claim 1, characterized in that, The inhibitor in S2 is carboxymethyl cellulose, and the dosage is 300~600g / t.

4. The flotation separation process for high-sulfur stibnite according to claim 1, characterized in that, The secondary coarse tailings obtained from S3 are scavenged 1-2 times with a collector, and the scavenged tailings are sulfur concentrate.

5. The flotation separation process for high-sulfur stibnite according to claim 1, characterized in that, Collectors and frothers were added to the primary coarse tailings obtained from S2 for scavenging. The bottom product of the scavenging tank was tailings, and the scavenging was carried out twice.

6. The flotation separation process for high-sulfur stibnite according to claim 5, characterized in that, The tailings are subjected to flotation, and fluorite is obtained after flotation.

7. The flotation separation process for high-sulfur stibnite according to any one of claims 1-6, characterized in that, Sodium carbonate is used for pulp conditioning in S2, with a dosage of 800-2400 g / t of raw ore, and the pH value of the roughing pulp is 5-7; lead nitrate is used as the activator, with a dosage of 100-300 g / t of raw ore.

8. The flotation separation process for high-sulfur stibnite according to any one of claims 1-6, characterized in that, The collector is ethyl thiocyanate, with a dosage of 3~30 g / t of raw ore; the frother is methyl isobutyl methanol, with a dosage of 5~30 g / t of raw ore.

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