Composite depressant, composite flotation agent and method for selective flotation separation of barite and gangue

Abstract

This invention belongs to the field of mineral flotation, specifically relating to a composite depressant, composite flotation agent, and method for selectively flotating and separating barite and gangue. The composite depressant comprises component A and component B in a weight ratio of 5-9:1-5; component A is the product of an esterification reaction between a compound of Formula 1 (#imgabs0#) and starch; and component B is water glass. Modifying starch using Formula 1 is key to achieving synergistic effects with component B, enhancing gangue inhibition and thereby improving selectivity in gangue and barite separation. Research has shown that further optimizing the ratio of component A (Formula 1) to starch can further optimize the network structure of component A, potentially enhancing its and component B's selective inhibition of barite and gangue minerals.

Description

Technical Field

[0001] The present invention belongs to the technical field of mineral processing, and in particular relates to the field of barite flotation. Background Art

[0002] Barite (BaSO4) is a non-metallic mineral with significant industrial value. Its primary component, barium sulfate, gives it high density, chemical inertness, and excellent physical and chemical properties. Consequently, it is widely used in a variety of fields, including petroleum, chemicals, building materials, pharmaceuticals, and coatings. In the petroleum industry, barite is used as a weighting agent in drilling mud, effectively controlling well pressure and preventing blowouts. In the chemical industry, barite is a key raw material for the preparation of barium salts. In the building materials industry, barite's high density and radiation-shielding properties make it suitable for the manufacture of radiation-resistant concrete and high-end building materials.

[0003] However, with the increasing depletion of high-grade barite resources, the development of low-grade barite ores has gradually become a key focus of industry development. Low-grade barite ores are often associated with carbonate minerals such as calcite (CaCO3) and dolomite (CaMg(CO3)2). These associated minerals share a high degree of similarity in physical and chemical properties with barite. In particular, their surface wettability and floatability are similar during flotation, making it difficult to achieve efficient separation of barite and associated minerals using traditional flotation processes. Furthermore, silicate minerals such as mica and feldspar in low-grade ores are finely embedded and exhibit severe mudification, making them susceptible to activation and flotation by metal ions in the slurry, further increasing the difficulty of separation.

[0004] In flotation technology, prior art also reports on inhibitors such as water glass, starch, carboxymethyl cellulose, and starch. For example, Chinese patent publication No. CN110102412A discloses a method for preparing high-purity fluorspar powder and efficiently utilizing tailings barite, specifically describing the use of starch as an inhibitor. Furthermore, Chinese patent publication No. CN101585016A discloses a flotation separation method for low-grade fluorspar and barite, specifically describing the use of starch, sodium sulfate, hydrochloric acid, and sodium hexametaphosphate as inhibitors for barite minerals.

[0005] While existing inhibitors can inhibit the flotation of associated minerals to a certain extent, their poor selectivity makes it difficult to achieve efficient barite enrichment in complex mineral systems. Furthermore, the use of existing inhibitors often requires high dosages, which not only increases production costs but also may have negative environmental impacts. Therefore, developing an efficient and highly selective inhibitor is key to solving the difficult problem of low-grade barite ore sorting. Summary of the Invention

[0006] In order to solve the problem of unsatisfactory flotation selectivity of barite and gangue during barite flotation, the first object of the present invention is to provide a composite inhibitor for selective flotation separation of barite and gangue, aiming to selectively inhibit the gangue associated with barite minerals and improve the flotation grade of barite.

[0007] The second object of the present invention is to provide a composite flotation agent comprising the composite depressant, so as to improve the selective flotation separation effect of barite and gangue.

[0008] The third object of the present invention is to provide a method for selectively flotating and separating barite and gangue, aiming to improve the flotation recovery rate and selectivity of barite.

[0009] Barite is often interbedded with gangue (primarily calcium-containing minerals and silicate minerals), making flotation separation of the two difficult. Furthermore, as the barite grade decreases, the difficulty of selective flotation separation increases significantly. To address this issue, the present invention, after in-depth research, provides the following improved solutions:

[0010] A composite depressant for selective flotation separation of barite and gangue, comprising component A and component B in a weight ratio of 5-9:1-5; wherein component A is the product of an esterification reaction (also known as a modification reaction) of a compound of formula 1 and starch; and component B is water glass.

[0011]

[0012] Formula 1.

[0013] The present invention innovatively combines a modified starch product (component A) of Formula 1 with component B, and further coordinates the joint control of the ratio of the components. This can optimize the network structure of the material based on the hydrogen bond interaction between the components, enabling it to highly selectively suppress gangue in barite minerals while substantially not suppressing barite, thereby facilitating the selective separation of barite and gangue.

[0014] In the present invention, the starch is at least one of corn starch and potato starch.

[0015] In the present invention, the preparation method of component A is as follows: starch and formula 1 are subjected to esterification reaction, followed by drying and dehydration to obtain component A.

[0016] In the present invention, the solvent for the esterification reaction can be water, wherein the mass ratio of starch to water is 1:10-20.

[0017] In the present invention, the weight ratio of the compound of formula 1 to starch is 1:1-10; further, it can be 1:1.5-3; and more preferably, it is 1:1.8-2.2. In the present invention, at the above ratios, the synergistic properties of the prepared component A and other components can be effectively improved. In particular, at the preferred ratios, it helps to further optimize the network of component A, further strengthen its synergy with component B, and further enhance the capture capacity and selectivity of barite.

[0018] In the present invention, the esterification reaction time can be 0.25-1 h, and the esterification reaction temperature can be 50-100° C.

[0019] In the present invention, after the esterification reaction is completed, a dehydration treatment can be performed in a medium vacuum drying oven in advance, wherein the temperature of the dehydration stage can be 30-70°C, and further can be 50-70°C, and the dehydration time can be 12-24 hours. Subsequently, drying can be performed at a temperature of 80-130°C, and further can be 100-130°C, and the drying time can be 3-7 hours.

[0020] In the present invention, modifying starch using Formula 1 is key to achieving synergy with component B, enhancing gangue suppression, and thus facilitating selectivity in gangue and barite separation. Research has shown that further optimizing the ratio of component A (Formula 1) to starch can help further optimize the network structure of component A, potentially further enhancing its and component B's selective suppression of barite gangue minerals.

[0021] In the present invention, the weight ratio of component A to component B is 7-8:2-3, and more preferably 8:2. Studies have shown that this optimal ratio further enhances the synergistic effect of components A and B, helping to further improve the selective inhibition of intergrown gangue in barite.

[0022] In the present invention, the gangue includes at least one of carbonate minerals and silicate minerals.

[0023] The present invention also provides a composite flotation agent for selectively flotating and separating barite and gangue, comprising a collector and an inhibitor, wherein the inhibitor is the composite inhibitor described in the present invention.

[0024] In the present invention, the collector may be any collector known in the industry that can be used for collecting barite. For example, as an optional solution, it may be a compound having a structure of Formula 2;

[0025] Formula 2

[0026] The R is a saturated or partially unsaturated carbon chain with 10 to 20 carbon atoms, a benzene ring or a substituted benzene ring, and the substituted benzene ring is a phenyl group with at least one substituent selected from the group consisting of an alkyl group, an alkoxy group, a halogen group, a nitro group and a trifluoromethyl group.

[0027] Furthermore, the collector is at least one of oleic acid and its salts (also referred to as component C) and linoleic acid and its salts (also referred to as component D); preferably, oleic acid and its salts, and linoleic acid and its salts. Research in the present invention has shown that combining the composite inhibitor and the composite collector can further synergistically enhance the separation selectivity of barite and gangue.

[0028] The salts of oleic acid and linoleic acid may be their respective water-soluble salts, such as sodium salts.

[0029] Furthermore, in the collector, the weight ratio of oleic acid and its salts to linoleic acid and its salts is 5-9:1-5; preferably 6-8:2-4; and more preferably 7-8:2-3. Studies have shown that this preferred ratio further synergizes with the composite inhibitor, helping to further improve the barite capture capacity and separation selectivity.

[0030] In the present invention, the composite flotation reagent further comprises at least one other flotation aid selected from the group consisting of a pH regulator and a frother.

[0031] In the present invention, the composite flotation agent is an inhibitor for selective flotation separation of barite and gangue.

[0032] Preferably, the gangue includes at least one of carbonate minerals and silicate minerals.

[0033] The present invention also provides a method for selectively flotating and separating barite and gangue, wherein the mineral to be selected containing barite and gangue is subjected to flotation treatment in a flotation agent containing the composite depressant to obtain barite concentrate and gangue tailings.

[0034] In the present invention, the flotation reagent is the composite flotation reagent comprising the composite depressant and the collector as described in the present invention.

[0035] In the present invention, the flotation process and operation can be controlled based on existing means and principles. For example, the mineral to be selected can be subjected to roughing treatment to obtain a rougher concentrate and rougher tailings. In addition, the rougher concentrate can be further refined and the rougher tailings can be scavenged as needed.

[0036] In the present invention, the dosage of the drug can be adjusted as needed.

[0037] Preferably, in the roughing process, the amount of the composite inhibitor used is 500-2000 g / t, preferably 500-1500 g / t, more preferably 1000-1500 g / t; further preferably 1000-1200 g / t.

[0038] During the roughing process, the amount of the collector used is 300-600 g / t, preferably 300-500 g / t, more preferably 400-500 g / t; further preferably 400-450 g / t.

[0039] In the present invention, the temperature during the flotation process is 0-40°C, and further can be 0-30°C.

[0040] Preferably, the pH during the flotation process is 7.5-11.0, and can further be 8.5-9.5.

[0041] In the present invention, the composite depressant described herein is used in the concentrating process. The number of concentrating stages can be adjusted as needed. For example, when multiple concentrating stages are used, the dosage of the concentrating agent is reduced at each stage. The reduction in dosage can be 30-60%. The final barite concentrate is obtained in the final concentrating stage, and the middlings from the concentrating process are returned to the previous flotation stage.

[0042] In the present invention, the collector of the present invention is used for scavenging. The scavenged concentrate is returned to the roughing process, and the scavenged tailings are the final tailings. The scavenging collector is 10-50% of the amount of the roughing collector.

[0043] Preferably, in the mineral to be selected, the grade of the barite can be 20-70%, and further can be 50-70%.

[0044] In addition, the mineral to be selected may also be a fine-grained refractory mineral, and its particle size may be 5 to 20 μm.

[0045] Preferably, the gangue minerals in the low-grade barite ore are fine-grained interbedded carbonate minerals and silicate minerals.

[0046] In addition, the embedded particle size of the gangue minerals can be 2-10 μm, and the flotation method of the present invention also has a good inhibitory effect on the fine-grained gangue minerals.

[0047] Beneficial effects

[0048] 1. The present invention provides a composite inhibitor comprising component A and component B, which can be combined and synergized based on the type of component A, component B and the ratio between the components to optimize the inhibition selectivity of gangue in barite, thereby improving the selective separation of barite and gangue.

[0049] The inhibitor of the present invention has good inhibitory effect and selectivity and requires less dosage.

[0050] 2. The present invention innovatively combines the composite inhibitor and collector, especially a combined collector comprising oleic acid and its salts and linoleic acid and its salts, to further enhance the capture capacity and selectivity of barite in the flotation process and strengthen the inhibition capacity and selectivity for gangue minerals.

[0051] 3. The reagent provided by the present invention has good flotation effect under neutral and alkaline pulp conditions, has a wide tolerance to pulp pH, and is insensitive to changes in flotation pulp temperature. At lower temperatures, the flotation indicators are better, the pollution is lower, and the reagent selectivity is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 The XRD pattern of the mineral to be selected in Example 1;

[0053] Figure 2 This is a closed-circuit flotation flow chart of the "one coarse, three fine, and one sweep" process for low-grade barite of the present invention. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention is further described in detail below with reference to specific embodiments and accompanying drawings.

[0055] The composite inhibitor of the present invention comprises component A and component B, wherein the component A can be obtained by modification reaction of formula 1 with starch; and component B is water glass.

[0056] In the composite inhibitor, the weight content of component A is ≥60%, further 60-90%, and even further 70-80%.

[0057] In the present invention, the water glass is Na2O·nSiO2, and its modulus is 2-2.4.

[0058] In the present invention, by controlling the ratio of each agent in the composite depressant, the flotation result of low-grade barite can be significantly improved, and the separation effect between barite and carbonate minerals and silicate minerals can be enhanced.

[0059] The present invention also provides a collector comprising at least one of oleic acid and its salts (ingredient C) and linoleic acid and its salts (ingredient D). Components C and D are sodium salts or potassium salts of oleic acid and linoleic acid, respectively.

[0060] The collector comprises component C and component D, wherein the weight content of component C is 60-80%, preferably 70-80%.

[0061] The gangue minerals in the low-grade barite ore must include carbonate minerals and silicate minerals, and the carbonate minerals include at least one of calcite and dolomite.

[0062] The silicate mineral is mainly mica.

[0063] In the flotation method of the present invention, the mineral to be selected and the flotation reagent containing the composite depressant and the collector can be subjected to roughing to obtain roughing concentrate and tailings.

[0064] In the present invention, the rougher concentrate can be subjected to one to four stages of concentrating, as needed. The final stage of concentrating produces a barite concentrate. The middlings from the concentrating stage are returned to the previous flotation stage. Furthermore, the reagent used in the concentrating process is the aforementioned composite depressant.

[0065] In the present invention, the roughing tailings can also be subjected to scavenging treatment, wherein the scavenged tailings are the final tailings, and the selected concentrate is returned to the roughing process. In the present invention, the scavenging process uses the collector of the present invention.

[0066] In the roughing process of the present invention, the dosage of the composite inhibitor is 500-2000 g / t, preferably 500-1500 g / t, and further 1000-1500 g / t.

[0067] In the roughing process of the present invention, the amount of the collector is 300-600 g / t, preferably 300-500 g / t, and further can be 400-500 g / t.

[0068] The pH value in the flotation stage may be 7.5 to 11.0, preferably 8.5 to 9.5.

[0069] The flotation solution provided by the present invention requires a pulp temperature of 0-40°C, preferably 10-30°C.

[0070] Example 1

[0071] Example 1: Low-grade barite ore from the southwest region was used for flotation experiments. Figure 1 This is the semi-quantitative XRD analysis of barite ore. The main useful minerals in the ore are barite, with a BaSO4 content of 63%. The main gangue minerals are quartz, feldspar, mica, chlorite, calcite, and dolomite, with a calcite content of approximately 6.56% and a mica content of approximately 3.75%. Table 1 shows the particle size analysis of low-grade barite ore.

[0072]

[0073] As shown in Table 1, the barite and gangue minerals in the flotation samples were all finely embedded. 99% of the barite had an embedded particle size of ≤75μm, over 70% had an embedded particle size of ≤25μm, and nearly 50% had an embedded particle size of ≤10μm. Similarly, the majority of gangue minerals, such as calcite, dolomite, mica, feldspar, and quartz, had an embedded particle size of ≤25μm, with over 50% of the mica having an embedded particle size of ≤10μm. Gravity separation had little enrichment effect, resulting in a low-grade, fine-grained, and difficult-to-process barite ore.

[0074] Component A is prepared as follows: Formula 1, starch (corn starch in this case), and deionized water are mixed in a mass ratio of 1:2:20, heated and stirred for 1 hour at 50°C. After stirring, the mixed solution is dehydrated in a vacuum drying oven at 50°C for 24 hours. The dehydrated mixture is then placed in a drying oven at 120°C for 5 hours. The dried sample is then rinsed with ethanol to remove Formula 1. After washing, the sample is dried at room temperature to obtain Component A.

[0075] After obtaining ingredient A, press Figure 2 The flotation process is carried out, and the steps are as follows:

[0076] 1. Crush and grind the low-grade barite ore to an appropriate particle size (-0.074 mm accounts for 85%), adjust the slurry to a slurry concentration of 35%, control the flotation pH to 8.5, and the flotation slurry temperature to 30°C.

[0077] 2. Add composite depressants to the slurry after slurry adjustment, and change the ratio of composite depressants to explore the influence of depressant type and weight content on the final flotation index (inhibitor composition, ratio and results are shown in Table 2). The depressant is stirred for 10 minutes, and the dosage of the roughing composite depressant is 1000g / t.

[0078] 3. Add the combined collectors of oleic acid and linoleic acid, wherein the weight content of oleic acid is 70% and the weight content of linoleic acid is 30%, and stir for 5 minutes. The dosage of the combined collector in the roughing stage is 400g / t.

[0079] 4. Flotation separation collects the concentrate and tailings, and the concentrate is then beneficiated. During the beneficiation process, only the composite depressant from step 2 is added, and the dosage is half of that in the previous stage. During the scavenging process, only the collector from step 3 is added, and the dosage is 1 / 4 of that in the previous stage.

[0080] 5. Collect barite concentrate and tailings, analyze and test to obtain the final indicators.

[0081]

[0082] Note: Compared with ingredient A1, the only difference between ingredient A is that the corn starch has not been chemically modified according to formula 1;

[0083] Comparative component A2 is compared with component A, the only difference being that an equal amount of acetic acid is used to replace the formula 1.

[0084] Comparative component A3 is different from component A only in that an equal amount of phosphoric acid is used to replace the formula 1.

[0085] Among them, it can be seen from groups a, b, c, and d that combining component A and component B, especially compounding them in a ratio of 7~8:2~3, can optimize the network structure based on the hydrogen bonding effect of the components and can synergistically enhance the separation selectivity of barite and gangue.

[0086] It can be seen from group b and comparison groups 1 to 6 that the grafting modification of starch using formula 1 of the present invention is helpful in forming a special hydrogen bond network compared with other modification schemes and other conventional inhibitors, which helps to achieve synergy and enhance the separation selectivity of barite and gangue.

[0087] Example 2

[0088] Compared with Group b of Example 1, the only difference is that the preparation conditions of component A are changed. The experimental groups are:

[0089] Formula 1, starch (corn starch in this case), and deionized water were mixed and heated with stirring in a mass ratio of 1:2.5:25. The stirring time during heating and stirring was 0.25 hours at a temperature of 100°C. After stirring, the mixed solution was dehydrated in a vacuum drying oven at 60°C for 20 hours. The dehydrated mixture was placed in a drying oven at 130°C for 4 hours. The dried sample was then washed with ethanol to remove Formula 1. After washing, the sample was dried at room temperature to obtain Component A. Other operations and parameters were the same as those in Group b of Example 1. After flotation, the flotation results are shown in Table 3.

[0090]

[0091] In Example 2, a barite concentrate product with a BaSO4 grade of 91.67% and a recovery rate of 90.55% was obtained, and the flotation results were similar to those of Group b in Example 1.

[0092] Example 3

[0093] Compared with Group b of Example 1, the only difference is that the preparation conditions of component A are changed. The experimental groups are:

[0094] Formula 1, starch (potato starch in this case), and deionized water were mixed and heated with stirring in a mass ratio of 1:1.5:30. The stirring time during heating and stirring was 0.5 hours at 90°C. After stirring, the mixed solution was dehydrated in a vacuum drying oven at 70°C for 18 hours. The dehydrated mixture was placed in a drying oven at 110°C for 6 hours. The dried sample was then washed with ethanol to remove Formula 1. After washing, the sample was dried at room temperature to obtain Component A. Other operations and parameters were the same as those in Group b of Example 1. After flotation, the flotation results are shown in Table 4.

[0095]

[0096] In Example 3, a barite concentrate product with a BaSO4 grade of 92.28% and a recovery rate of 92.60% was obtained, and the flotation results were similar to those of Group b in Example 1.

[0097] Example 4

[0098] The low-grade barite ore of Example 1 was selected, and the flotation operation steps of Example 4 were as follows:

[0099] 1. Crush and grind the low-grade barite ore to an appropriate particle size (-0.074 mm accounts for 85%), adjust the slurry to a slurry concentration of 35%, control the flotation pH to 9.0, and the flotation slurry temperature to 30°C.

[0100] 2. A composite inhibitor was added to the slurry after slurry adjustment. The composite inhibitor consisted of component A (same as in Example 1) and water glass. The weight content of component A was 80% and the weight content of water glass was 20%. The inhibitor was stirred for 10 minutes. The dosage of the roughing composite inhibitor was 800 g / t.

[0101] 3. Add oleic acid and linoleic acid as combined collectors, change the weight content of oleic acid and linoleic acid in the combined collector, and explore the effect of the ratio of oleic acid and linoleic acid on the flotation results. Stir for 5 minutes, and the dosage of the roughing combined collector is 300g / t.

[0102] 4. Flotation separation collects concentrate and tailings, and the concentrate is beneficiated. During the beneficiation process, only composite depressants are added, and the dosage is half of that in the previous stage. During the scavenging process, only collectors are added, and the dosage is 1 / 4 of that in the previous stage.

[0103] 5. Collect barite concentrate and tailings, analyze and test to obtain the final indicators. The structure is shown in Table 5.

[0104]

[0105] As shown in Table 5, the selection of oleic acid and linoleic acid as a combined collector, especially controlling the composite ratio of oleic acid to linoleic acid to be 6-8:2-4, can be combined with the agent of the present invention to further achieve synergy, which helps to further enhance the separation selectivity of barite and gangue.

[0106] Example 5

[0107] The low-grade barite ore of Example 1 was selected. The flotation operation steps and reagent ratios of Example 5 were consistent with those of Group b of Example 1. The flotation process parameters were changed. The experimental groups were:

[0108] a: The flotation depressant in the roughing stage is 500 g / t; the dosage of the combined collector is 400 g / t, and the flotation pH is 7.5; other parameters such as the dosage ratio of the cleaning and scavenging agents and the previous flotation agents are the same as those in Group b of Example 1;

[0109] b: The flotation depressant in the roughing stage was 1500 g / t; the dosage of the combined collector was 500 g / t, and the flotation pH was 11; other parameters such as the dosage ratio of the cleaning and scavenging agents and the previous flotation agents were the same as those in Group b of Example 1;

[0110] c: The temperature of the flotation process is 10°C;

[0111] d: The temperature of the flotation process is 0°C;

[0112] The flotation results of each group are shown in Table 6. The flotation results are shown below.

[0113]

[0114] As shown in Table 6, the method of the present invention can achieve excellent capture effect at a lower dosage of the reagent. In addition, the method of the present invention has a wide temperature range application requirement and can achieve good capture ability and selectivity even at low temperatures.

[0115] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. It should be noted that the above preferred embodiments should not be considered as limiting the present invention, and the scope of protection of the present invention should be based on the scope defined in the claims. It will be apparent to those skilled in the art that various improvements and modifications can be made without departing from the spirit and scope of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A composite depressant for selective flotation separation of barite and gangue, characterized in that: The invention comprises component A and component B in a weight ratio of 5-9:1-5; wherein the component A is the product of esterification reaction between the compound of formula 1 and starch; and the component B is water glass; Formula 1.

2. The composite inhibitor according to claim 1, characterized in that The starch is at least one of corn starch and potato starch; Wherein, the weight ratio of the compound of formula 1 to starch is 1:1-10.

3. The composite inhibitor according to claim 1 or 2, characterized in that The weight ratio of component A to component B is 7-8:2-3; The gangue includes at least one of carbonate minerals and silicate minerals.

4. A composite flotation agent for selectively flotating and separating barite and gangue, comprising a collector and an inhibitor, characterized in that: The inhibitor includes the composite inhibitor according to any one of claims 1 to 3.

5. The composite flotation reagent according to claim 4, characterized in that: The collector is a compound having a structure of formula 2; Formula 2 The R is a saturated or partially unsaturated carbon chain with 10 to 20 carbon atoms, a benzene ring or a substituted benzene ring, and the substituted benzene ring is a phenyl group with at least one substituent selected from the group consisting of an alkyl group, an alkoxy group, a halogen group, a nitro group and a trifluoromethyl group.

6. The composite flotation reagent according to claim 5, characterized in that: The collector includes component C and component D, wherein component C is oleic acid and its salts, and component D is linoleic acid and its salts; The weight ratio of component C to component D is 5-9:1-5.

7. A method for selective flotation separation of barite and gangue, characterized in that: The mineral to be processed containing barite and gangue is subjected to flotation treatment in a flotation agent containing the composite depressant according to any one of claims 1 to 3 to obtain barite concentrate and gangue tailings.

8. The method for selective flotation separation of barite and gangue according to claim 7, characterized in that: The flotation agent is the composite flotation agent according to any one of claims 4 to 6.

9. The method for selective flotation separation of barite and gangue according to claim 8, characterized in that: The flotation process includes a roughing process, wherein the dosage of the composite depressant in the roughing process is 500~2000g / t; the dosage of the collector is 300~600g / t; The temperature during flotation is 0~40℃; The pH during flotation is 7.5~11.

0.

10. The method for selective flotation separation of barite and gangue according to claim 9, characterized in that: The flotation process also includes a process of using the composite depressant described in any one of claims 1 to 3 to beneficiate the rougher concentrate; and a process of using the collector in the composite flotation reagent described in any one of claims 4 to 6 to scavenge the rougher tailings.

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