Direct flotation composite collecting agent for bauxite with low aluminum-silicon ratio and preparation method of direct flotation composite collecting agent

Abstract

The invention discloses a low-alumina-silica-ratio bauxite direct flotation composite collecting agent and a preparation method thereof, and the method comprises the following steps: gradually adding an emulsifier into water, and stirring until the emulsifier is uniformly mixed to obtain an emulsifier solution; adding a fatty acid soap compound, a hydroximic acid compound and a co-emulsion into the emulsifier solution, and then heating, stirring and uniformly mixing to obtain a medicament mixed solution; and the agent mixed solution is placed in an ultrasonic cleaning machine or a stirring emulsifying machine, a synergist is added for a synergistic reaction, the solution is stirred to be uniform, and the composite collecting agent is obtained. The method is simple and easy to implement, the emulsifying effect can be improved, the production cost is reduced, the using amount of the collecting agent in the sorting process is reduced, mineral resources are saved and efficiently utilized, and the prepared collecting agent has the advantages of being excellent in selectivity, strong in collecting capacity, good in agent stability, resistant to low temperature and the like and is suitable for mineral separation of bauxite with the low aluminum-silicon ratio. The concentrate grade and recovery rate can be effectively improved, and the aluminum-silicon ratio of the concentrate is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal ore dressing, and in particular relates to a method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio. Background Art

[0002] my country's bauxite resources are mainly low- and medium-grade diaspore-type bauxite, which cannot be directly used in the Bayer process. They need to be desiliconized by flotation to increase the aluminum-silicon ratio before entering the next Bayer process. The industrial application of bauxite flotation technology in the Bayer process of alumina production has effectively improved the utilization rate of my country's bauxite resources and enhanced the market competitiveness of my country's alumina industry.

[0003] Bauxite flotation desiliconization collector is a key technology for bauxite flotation separation. Developing and synthesizing the most effective collector is an important way to improve flotation technology and economic indicators. Commonly used bauxite positive flotation collectors mainly include fatty acid soap compounds and hydroxamic acid compounds. Among them, fatty acid soap compounds include fatty acids with different carbon chains and double bond structures, oxidized paraffin soaps, tall oil, cyclohexane acid, sodium dodecyl sulfonate, sodium dodecyl sulfate, etc. The main problems of these agents in the bauxite flotation desiliconization process are: large dosage of agents, poor selectivity, low concentrate recovery rate, and difficult sedimentation of flotation tailings and difficulty in using backwater. Hydroxamic acid compounds mainly include alkyl hydroxamic acid, benzohydroxamic acid, salicylic hydroxamic acid, etc. The problems of these agents in bauxite flotation desiliconization are relatively insufficient collection capacity and high prices.

[0004] At present, the method of mixing bauxite collectors is widely used in industry. The conventional method of preparation is to mix a certain amount of emulsifier (such as common alkylphenol polyoxyethylene ethers, poly(fatty alcohol) polyoxyethylene ethers, polyethylene glycols, Tweens, etc.) with fatty acid soap compounds and hydroxamic acid compounds in a normal temperature or heated aqueous solution, and obtain a flotation agent solution after mechanical stirring. Compared with the use of fatty acid soap compounds or hydroxamic acid compounds alone, the use of emulsifiers helps to reduce the dosage of agents and improve the separation index to a certain extent. However, the mixed collector obtained by conventional emulsification still has problems such as poor emulsification effect, uneven dissolution of agents, poor stability of agents, and high comprehensive cost of agents. Summary of the invention

[0005] The object of the present invention is to provide a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio and a preparation method thereof. The method is simple and easy to operate, can improve the emulsification effect, reduce the production cost, reduce the amount of collector used in the separation process, and realize the conservation and efficient utilization of mineral resources. The prepared collector has the advantages of excellent selectivity, strong collecting ability, good reagent stability, low temperature resistance, etc., is suitable for the beneficiation of bauxite with a low aluminum-silicon ratio, can effectively improve the concentrate grade and recovery rate, and significantly improve the aluminum-silicon ratio of the concentrate.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: the composite collector is obtained by mixing, emulsifying and synergizing water, an emulsifier, a fatty acid soap compound, a hydroxamic acid compound, an emulsifier and a synergist, and the mass ratio of the fatty acid soap compound, the hydroxamic acid compound, the emulsifier, the emulsifier and the synergist before the reaction is 1: (0.2-0.8): (0.05-0.5): (0.05-0.2): (0.1-0.8); the emulsifier is a mixture of polyvinyl pyrrolidone and polyethylene glycol, and the mass ratio of polyvinyl pyrrolidone to polyethylene glycol is 1:1-1:4.

[0007] A method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio, comprising the following steps:

[0008] A. Gradually add emulsifier to water and stir until mixed to obtain emulsifier solution;

[0009] B. adding fatty acid soap compounds, hydroxamic acid compounds and emulsifiers to the emulsifier solution prepared in step A, followed by heating and stirring to obtain a pharmaceutical mixture;

[0010] C. Place the mixed solution of the reagents prepared in step B in an ultrasonic cleaning machine or a stirring emulsifier, add a synergist to perform a synergistic reaction, and stir the solution evenly to obtain a composite collector.

[0011] Preferably, in step A, the emulsifier is a mixture of PVP-K30 and PEG-600, the mass ratio of the two is 1:1 to 1:4, and the emulsifier content in the composite collector is 1% to 6%.

[0012] Preferably, in step B, the emulsifier is a mixture of C5-C9 fatty alcohol and sodium carbonate, and the mass ratio of the two is 1:1 to 1:5.

[0013] Preferably, in step B, the mass ratio of the fatty acid soap compound, the hydroxamic acid compound, the emulsifier and the emulsifier is 1: (0.2-0.8): (0.05-0.5): (0.05-0.2).

[0014] Preferably, in step B, the heating temperature is 20 to 80° C. and the stirring time is 0.5 to 5 h.

[0015] Preferably, in step B, the fatty acid soap compound is one or more of oleic acid, oxidized paraffin soap, and tall oil.

[0016] Preferably, in step B, the hydroxamic acid compound is a mixture of benzohydroxamic acid and octylhydroxamic acid in a mass ratio of 1:1.

[0017] Preferably, in step C, the synergist is trimethyl silicone oil, octamethyl trisiloxane, lauryl mercaptan, C 12 ~C 14 One or more of fatty alcohol, kerosene and coal tar.

[0018] Preferably, in step C, the mass ratio between the fatty acid soap compound and the synergist in the mixed solution is 1:(0.1-0.8).

[0019] Preferably, in step C, the processing time of the ultrasonic cleaning machine or the stirring emulsifier is 1 to 3 hours.

[0020] In the present invention, the emulsifier is a mixture of polyvinyl pyrrolidone (PVP-K30) and polyethylene glycol (PEG-600). Although polyethylene glycol has been widely used in the preparation of mining emulsifiers, the mixed use of polyethylene glycol and polyvinyl pyrrolidone is still less common. Polyvinyl pyrrolidone has excellent solubility, solubilization, complexation, surface activity and chemical stability. The use of polyvinyl pyrrolidone together with polyethylene glycol can effectively improve the mutual solubility between insoluble substances in the composite agent, enhance the solubilization and emulsification between different components and the stability of the entire composite agent.

[0021] In the present invention, fatty acid soap compounds have strong capture performance, wide sources and low prices, and are an important component of the composite agent. They can reduce the overall agent cost while ensuring excellent separation indicators; hydroxamic acid compounds have a selective chelating effect on metal elements (such as Fe, Cu, Zn, etc.) in ores, which helps to improve the selective capture ability of the composite collector.

[0022] The emulsifier in the present invention is a mixture of C5-C9 fatty alcohol and sodium carbonate. C5-C9 fatty alcohol and sodium carbonate are cheap. They can not only enhance the mutual solubility between the components and improve the low-temperature foaming and flotation performance of the composite agent, but sodium carbonate can also adjust the pH of the solution system and strengthen the dispersion of ore mud during the separation process, thereby improving the comprehensive separation index.

[0023] The synergist (trimethyl silicone oil, octamethyl trisiloxane, lauryl mercaptan) in the present invention has excellent surface activity, can significantly adjust the foam characteristics of the composite collector, regulate the selective interaction between different components and mineral particles, and thus improve the flotation foam condition and increase the flotation selectivity; C 12 ~C14 The prices of fatty alcohols, kerosene and coal tar are lower than those of commonly used fatty acid soap agents. When added as enhancers, they can not only adjust the flotation foam, but also significantly improve the recovery of coarse and fine particles, thereby reducing the overall reagent cost and increasing the flotation recovery rate.

[0024] like Figure 1 As shown, common anionic collectors (such as anionic fatty acid soaps and hydroxamic acid compounds) mainly adsorb on the surface of bauxite through the molecular-ion association effect to change its surface hydrophilicity. The single molecule and ion action ability in this modification is limited. In order to achieve sufficient hydrophobicity on the mineral surface, a large amount of reagents are often consumed. The strong emulsification and strong dispersion promoting agents in the composite collector solution prepared by the present invention act on the mineral in the form of free molecules, microemulsions, and nanoparticles, which can significantly improve the comprehensive utilization efficiency of the reagents and improve the floatability of the mineral. At the same time, due to the porous nature of bauxite, the nanoemulsions and nanoparticles present in the composite collector can be effectively filled into the pores of the bauxite particles, which can significantly reduce the amount of reagents while strengthening the hydrophobicity of the bauxite particles, thereby improving the comprehensive separation efficiency and benefits.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) Based on the occurrence form of bauxite, the process mineralogy characteristics (the mineralization causes bauxite to be generally easy to be muddy, the surface pores of the block ore are well developed, the specific surface area is large, etc.), and the characteristics of the beneficiation and enrichment process and method, the present invention has developed a simple and easy preparation method. The method can improve the emulsification effect, reduce the production cost, reduce the amount of collector used in the separation process, and realize the conservation and efficient utilization of mineral resources. The prepared collector has the advantages of excellent selectivity, strong collection ability, good reagent stability, low temperature resistance, etc., and is suitable for the beneficiation of low aluminum-silicon ratio bauxite, which can effectively improve the concentrate grade and recovery rate, and significantly improve the aluminum-silicon ratio of the concentrate; in addition, the composite collector prepared by the present invention can directly and effectively float bauxite without removing fine mud, and is suitable for the positive flotation desiliconization process of different types of low aluminum-silicon ratio bauxite (including diaspore type, boehmite type and gibbsite type).

[0027] (2) Based on the comprehensive consideration of reagent cost and mineral processing efficiency, the present invention is based on the principle of synergistic effect of different reagent combinations, and through the effective compound combination of emulsifiers, fatty acid soap compounds, hydroxamic acid compounds, emulsifiers and synergists, the components in the collector are adsorbed and synergistic on the surface of bauxite. The types and proportions of different reagents in the compound reagents are the key to ensuring the final good bauxite separation index. This method can selectively increase the hydrophobicity of the surface of the target mineral of bauxite, enhance the adsorption selectivity and collection capacity of the reagent, and thus improve the mineral processing technical indicators of low aluminum-silicon ratio bauxite.

[0028] (3) The collector prepared by the present invention has good stability and can stably exist in the form of an emulsion at room temperature. After being diluted with water, the emulsion still maintains good stability and can stably play a role during the slurry flotation time; it has strong dispersibility in the slurry, fully reacts with the mineral, and significantly improves the flotation index; it has good foaming properties, fine and uniform foam, and does not require additional foaming agent; the raw material source is wide, and the comprehensive agent cost is low; the comprehensive agent usage is small, and the agent cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the interaction between the surface porous bauxite and the conventional collector and the composite collector prepared by the present invention;

[0030] Figure 2 This is a process flow chart of bauxite separation in the present invention;

[0031] Figure 3 Surface morphology and structure diagrams of bauxite at different magnifications: (a), scale 1 mm, (b), scale 500 μm, (c), scale 200 μm, (d), scale 10 nm. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0033] The present invention uses a bauxite in Zunyi, Guizhou. The grade of Al2O3 in the raw bauxite is 58.18%, the grade of SiO2 is 17.59%, and the aluminum-silicon ratio A / S is 3.31. Al2O3 is mainly produced in the form of diaspore, which is basically monohydrate diaspore. The ore is gray and mottled gray under the naked eye. The ore structure is relatively loose, easy to knock, and has obvious signs of weathering. Figure 3 The surface morphology of electrical bauxite ore at different magnification ratios shows that the surface pores of the bauxite are well developed and it has typical bauxite process mineralogy characteristics.

[0034] Comparative Example 1

[0035] A method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio, comprising the following steps:

[0036] A. Gradually add 25 parts of sodium carbonate to 120 parts by mass of water and stir until mixed to obtain a sodium carbonate solution;

[0037] B. Add 30 parts of oleic acid, 8 parts of benzohydroxamic acid and 8 parts of octylhydroxamic acid to the sodium carbonate solution prepared in step A in sequence, and then mechanically mix and stir at 65° C. for 3 hours to obtain a composite collector solution.

[0038] Example 1

[0039] A method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio, comprising the following steps:

[0040] A. Gradually add 6 parts of PEG-600 to 120 parts by mass of water and stir until mixed to obtain an emulsifier solution;

[0041] B. Add 30 parts of oleic acid, 8 parts of benzohydroxamic acid, 8 parts of octylhydroxamic acid, and 25 parts of sodium carbonate to the emulsifier solution prepared in step A, and then mechanically mix and stir at 65° C. for 3 hours to obtain a pharmaceutical mixture;

[0042] C. Place the mixed solution of the drug prepared in step B in a stirring emulsifier, add 3 parts of trimethyl silicone oil, 6 parts of C 12 ~C 14 The fatty alcohol and 8 parts of kerosene are subjected to synergistic reaction and the solution is stirred evenly to obtain a composite collector.

[0043] Example 2

[0044] In this embodiment, "the emulsifier selected in step A is PVP-K30 and PEG-600 in a mass ratio of 1:2, and the total mass fraction of the emulsifier remains unchanged, which is 6 parts, namely 2 parts of PVP-K30 and 4 parts of PEG-600", and the other steps remain consistent with Example 1.

[0045] The composite collectors prepared in Comparative Example 1, Example 1 and Example 2 were used in the positive flotation of bauxite. The flotation process was as follows: Figure 2 As shown, the ore is ground to a particle size of less than 0.074 mm, and the bauxite accounts for about 78% of the mass percentage of the entire bauxite. After grinding, under the condition of flotation temperature of 18-22°C, sodium carbonate, sodium hexametaphosphate, and composite collector are added in the roughing operation in sequence, and then stirred and slurried. After slurry adjustment, it enters the flotation tank for flotation. The slurry undergoes one roughing, two sweeping, and four fine operations, and the medium ore returns to the previous operation in sequence. A small amount of sodium hexametaphosphate is added to the fine I and fine II operations, and the fine III and fine IV are blank fine operations. A small amount of composite collector is added to the sweep I and sweep II. The flotation results are shown in Table 1:

[0046] Table 1 Effect of emulsifier types on positive flotation indexes of low aluminum-silicon ratio bauxite

[0047]

[0048]

[0049] As shown in Table 1, compared with the traditional fatty acid soap compound and hydroxamic acid compound combined collector, the composite collector prepared by adding emulsification and synergistic reaction in the present invention has higher collection performance and selectivity for the flotation of the low aluminum-silicon ratio bauxite, and the composite collector can obtain a higher concentrate Al2O3 recovery rate and aluminum-silicon ratio than conventional oleic acid; the overall effect of mixed use of PEG-600 and PVP-K30 is better than that of single use of PEG-600. Specifically, when PEG-600 and PVP-K30 are used, compared with the single use of PEG-600, the Al2O3 grade in the bauxite concentrate is reduced by 0.23%, the Al2O3 recovery rate is increased by 1.47%, and the A / S is only reduced by 0.02, which is related to the good solubilization effect of PVP-K30 on various organic matter and the selective flocculation effect on aluminosilicate gangue (such as kaolinite, mica, pyrophyllite, etc.) in the ore mud.

[0050] Example 3

[0051] In this embodiment, "the fatty acid soap compound selected in step B is oleic acid, oxidized paraffin soap and tall oil in a mass ratio of 3:2:1, and the total amount of fatty acid soap compounds added remains unchanged, which is still 30 parts", and the other steps remain consistent with Example 2.

[0052] Example 4

[0053] In this embodiment, "the emulsifier selected in step B is sodium carbonate and C5-C9 fatty alcohol in a mass ratio of 18:8, and the total amount of the emulsifier is 26 parts", and the other steps are consistent with Example 2.

[0054] Example 5

[0055] In this embodiment, "the temperature of the mixed raw materials in step B is changed to 50° C., and the mixing time is changed to 2 h", and the other steps remain the same as in embodiment 4.

[0056] The composite collectors prepared in Examples 3-5 were used in the direct flotation of bauxite. The flotation process was as follows: Figure 2 The flotation results are shown in Table 2:

[0057] Table 2 Effects of fatty acid soap compounds, emulsifier types and preparation conditions on positive flotation indexes of low aluminum-silicon ratio bauxite

[0058]

[0059] As shown in Table 2, the separation index obtained by using oleic acid as a fatty acid soap compound additive is similar to that obtained by using a mixture of oleic acid, oxidized paraffin soap, and tall oil, indicating that the compound agent has good adaptability to various types of fatty acid soap compounds. When sodium carbonate and C5-C9 fatty alcohols are used as emulsifiers together, the Al2O3 recovery rate of the selected concentrate is significantly improved compared with the single sodium carbonate condition. Specifically, by comparing the corresponding indicators of Example 4 and Example 2, it can be found that the addition of C5-C9 fatty alcohols leads to a 0.63% decrease in the Al2O3 grade in the concentrate, an increase of 1.04% in the Al2O3 recovery rate, and a decrease in A / S of 0.07. This is because short-chain fatty alcohols can solubilize other organic agents well, strengthen the selective adsorption of fatty acid soap compounds and hydroxamic acid compounds on the surface of bauxite, and enhance the stability of flotation foam. At the same time, by comparing the corresponding separation indicators of Example 5 and Example 4, it is found that lower temperature and stirring time when mixing raw materials are helpful to improve the activity of the composite collector and further improve the final separation index. This is because low temperature conditions are more conducive to the retention of volatile substances such as alcohol, thereby enhancing the solubilization of other organic substances.

[0060] Example 6

[0061] In this embodiment, "trimethyl silicone oil is no longer added as the synergist in step C, and the types and addition amounts of other synergists remain unchanged", and the other steps are consistent with those in Example 5, specifically including the following steps:

[0062] A. Gradually add 2 parts of PVP-K30 and 4 parts of PEG-600 to 120 parts by mass of water and stir until mixed to obtain an emulsifier solution;

[0063] B. Add 30 parts of oleic acid, 8 parts of benzohydroxamic acid, 8 parts of octylhydroxamic acid, 18 parts of sodium carbonate, and 8 parts of C5-C9 fatty alcohol to the emulsifier solution prepared in step A, and then mechanically mix and stir at 50° C. for 2 hours to obtain a pharmaceutical mixture;

[0064] C. Place the mixed solution of the drug prepared in step B in a stirring emulsifier and add 6 parts of C 12 ~C 14 The fatty alcohol and 8 parts of kerosene are subjected to synergistic reaction and the solution is stirred evenly to obtain a composite collector.

[0065] Example 7

[0066] In this embodiment, the synergist in step C is changed to 2 parts of lauryl mercaptan, 1 part of octamethyl trisiloxane, 6 parts of C 12 ~C 14 Fatty alcohol; 8 parts of kerosene, and other steps are consistent with Example 6.

[0067] Example 8

[0068] In this embodiment, the synergist in step C is changed to 3 parts of trimethyl silicone oil and 6 parts of C 12 ~C 14 Fatty alcohol, 8 parts of coal tar", and other steps are consistent with Example 6.

[0069] Example 9

[0070] In this embodiment, the synergist in step C is changed to 3 parts of trimethyl silicone oil and 6 parts of C 12 ~C 14 Fatty alcohol", and other steps are consistent with Example 6.

[0071] Example 10

[0072] In this embodiment, the synergist in step C is changed to 3 parts of trimethyl silicone oil and 6 parts of C 12 ~C 14 Fatty alcohol, 10 parts of coal tar, 2 parts of lauryl mercaptan" other steps are kept consistent with Example 6.

[0073] Embodiment 11

[0074] In this embodiment, "ultrasonic treatment is used instead of emulsifier stirring for the synergistic reaction in step C, and the treatment time is 3 hours", and the other steps remain consistent with Example 10.

[0075] The composite collectors prepared in Examples 6-11 were used in the direct flotation of bauxite. The flotation process was as follows: Figure 2 The flotation results are shown in Table 3:

[0076] Table 3 Effects of synergist type, dosage and synergistic reaction conditions on positive flotation indexes of low aluminum-silicon ratio bauxite

[0077]

[0078] As shown in Table 3, the corresponding selection results of Comparative Example 5, Example 6 and Example 7 show that if trimethyl silicone oil is not added, the final concentrate Al2O3 grade will significantly decline, while concentrate Al2O3 recovery does not significantly improve, and after using lauryl mercaptan and octamethyl trisiloxane to replace trimethyl silicone oil, flotation index remains essentially unchanged (concentrate Al2O3 recovery has reduced by 0.52%, and concentrate A / S has improved by 0.15). This illustrates that in this composite reagent, the interpolation of trimethyl silicone oil, lauryl mercaptan and octamethyl trisiloxane is indispensable, and when actually using, can comprehensively consider that index needs and reagent price use lauryl mercaptan and octamethyl trisiloxane to replace trimethyl silicone oil. Trimethyl silicone oil, lauryl mercaptan, octamethyl trisiloxane all belong to the more active surfactant, have good foaming effect, their interpolation helps to reduce the entrainment of gangue in flotation process, and can promote the selective adsorption of fatty acid soap compounds and hydroxamic acid compounds on the surface of the target mineral.

[0079] As shown in Table 3, by comparing the corresponding separation results of Example 5, Example 8, and Example 9, it can be seen that the addition of non-polar oil (kerosene, coal tar) in the synergist is necessary. The non-polar oil is cheap, and its addition can significantly reduce the overall reagent cost, and the presence of non-polar oil can ensure a higher concentrate Al2O3 recovery rate. At the same time, when coal tar is used instead of kerosene as a synergist, the final concentrate Al2O3 recovery rate is further improved. This is because bauxite has the characteristic of being naturally porous (the surface morphology of bauxite is shown in FIG. Figure 3 As shown in the figure, there are a large number of super-hydrophobic nano-solid particles in coal tar. When the composite agent interacts with the mineral particles, these super-hydrophobic nano-particles can effectively fill the hydrophilic pores, effectively improving the hydrophobicity of the bauxite surface while significantly reducing the amount of agent used.

[0080] As can be seen from Table 3, by comparing the corresponding separation results of Example 8 and Example 10, it can be seen that while ensuring that other reagent components remain unchanged, a slightly increased amount of coal tar is used and a small amount of additional lauryl mercaptan is added, a higher quality bauxite concentrate can be obtained (the Al2O3 grade of the concentrate is increased from 66.46% to 67.59%, and the A / S of the concentrate is increased by 0.2), while the Al2O3 recovery rate of the concentrate is only reduced by 0.31%, indicating that lauryl mercaptan can effectively improve the flotation selectivity of bauxite, and the addition of coal tar ensures a higher Al2O3 recovery rate of the concentrate.

[0081] As can be seen from Table 3, by comparing the corresponding separation results of Example 10 and Example 11, it can be seen that the use of an ultrasonic cleaner to move to a stirring emulsifier for synergistic reaction and extending the processing time can significantly improve the flotation performance of the final composite reagent. When the Al2O3 grade of the concentrate decreases by 0.12%, the Al2O3 recovery rate of the concentrate increases by 1.38%, and the A / S of the concentrate only decreases by 0.05. This shows that the use of ultrasonic waves with better emulsification and dispersion effects for synergistic reaction is more conducive to improving the comprehensive separation performance of the composite reagent.

[0082] In summary, under the same material conditions, the use of composite collectors instead of conventional fatty acid soap and hydroxamic acid combined collectors for positive flotation of low aluminum-silicon ratio bauxite can achieve higher concentrate Al2O3 grade, concentrate Al2O3 recovery rate and concentrate A / S, which fully demonstrates that the composite collector has better comprehensive separation performance than the conventional combined collector (a mixture of fatty acid soap compounds and hydroxamic acid compounds). At the same time, the use of PEG-600 and PVP-K30 mixed emulsifiers is better than that of single PEG-600 in separation effect; oleic acid, oxidized paraffin soap, and tar oil are all suitable as raw materials for fatty acid soap compounds; the use of sodium carbonate and C5-C9 fatty alcohol mixed emulsifiers can achieve better separation indicators than single sodium carbonate; trimethyl silicone oil, lauryl mercaptan, and octamethyl trisiloxane in synergists can effectively adjust flotation foam and promote the selectivity of fatty acid soap compounds and hydroxamic acid compounds on bauxite target minerals, thereby improving the selectivity of flotation; non-polar kerosene and coal tar help to improve the final concentrate Al2O3 recovery rate and the effect of coal tar is more obvious, because the super-hydrophobic nanoparticles therein can produce a "pore filling" effect on the surface of hydrophilic minerals. The performance of the composite agent is also affected by the proportion of various components, preparation conditions, etc., and the price of most of the agent components in the composite agent is lower than that of fatty acid soap compounds and hydroxamic acid compounds, which ensures the low cost and excellent cost performance of the agent.

[0083] There are many specific implementation ways of the present invention. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A composite collector for positive flotation of bauxite with low aluminum-silicon ratio, characterized in that: The composite collector is obtained by mixing, emulsifying and synergizing water, an emulsifier, a fatty acid soap compound, a hydroxamic acid compound, an emulsifier and a synergist. Before the reaction, the mass ratio of the fatty acid soap compound, the hydroxamic acid compound, the emulsifier, the emulsifier and the synergist is 1: (0.2-0.8): (0.05-0.5): (0.05-0.2): (0.1-0.8); the emulsifier is a mixture of polyvinyl pyrrolidone and polyethylene glycol, and the mass ratio of polyvinyl pyrrolidone to polyethylene glycol is 1:1-1:

4.

2. A method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio according to claim 1, characterized in that: The following steps are involved: A. Gradually add emulsifier to water and stir until mixed to obtain emulsifier solution; B. adding fatty acid soap compounds, hydroxamic acid compounds and emulsifiers to the emulsifier solution prepared in step A, followed by heating and stirring to obtain a pharmaceutical mixture; C. Place the mixed solution of the reagents prepared in step B in an ultrasonic cleaning machine or a stirring emulsifier, add a synergist to perform a synergistic reaction, and stir the solution evenly to obtain a composite collector.

3. The method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio according to claim 2, characterized in that: In step A, the emulsifier is a mixture of PVP-K30 and PEG-600, the mass ratio of the two is 1:1 to 1:4, and the emulsifier content in the composite collector is 1% to 6%.

4. The method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio according to claim 2 or 3, characterized in that: In step B, the emulsifier is a mixture of C5-C9 fatty alcohol and sodium carbonate, and the mass ratio of the two is 1:1 to 1:

5.

5. The method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio according to claim 2, characterized in that: In step B, the mass ratio of the fatty acid soap compound, the hydroxamic acid compound, the emulsifier and the emulsifier is 1: (0.2-0.8): (0.05-0.5): (0.05-0.2).

6. The method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio according to claim 2 or 3, characterized in that: In step B, the heating temperature is 20 to 80° C., and the stirring time is 0.5 to 5 h.

7. The method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio according to claim 2 or 3, characterized in that: In step B, the fatty acid soap compound is one or more of oleic acid, oxidized paraffin soap, and tall oil.

8. The method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio according to claim 2 or 3, characterized in that: In step B, the hydroxamic acid compound is a mixture of benzohydroxamic acid and octylhydroxamic acid in a mass ratio of 1:

1.

9. The method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio according to claim 2 or 3, characterized in that: In step C, the synergist is trimethyl silicone oil, octamethyl trisiloxane, lauryl mercaptan, C 12 ~C 14 One or more of fatty alcohol, kerosene and coal tar.

10. The method for preparing a composite collector for positive flotation of bauxite with a low aluminum-silicon ratio according to claim 2 or 3, characterized in that: In step C, the mass ratio between the fatty acid soap compound and the synergist in the mixed solution is 1:(0.1-0.8).

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