Vein quartz ore flotation reagent capable of efficiently removing iron

Abstract

The invention relates to the technical field of mineral processing, in particular to a vein quartz ore flotation reagent capable of efficiently removing iron, which is prepared from mixed amine, ethylenediamine, absolute ethyl alcohol, polymerized alpha-D-glucopyranose and diesel oil. According to the present invention, the iron-containing oxide in the vein quartz ore can be effectively removed through the reaction with the iron-containing oxide in the direct flotation process, and the method has advantages of low agent consumption, environmental protection, and good cost economy compared with the traditional acid soaking process and the flotation agent.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, in particular to a vein quartz ore flotation agent for efficient iron removal. Background Art

[0002] Vein quartz ore is the main raw material for preparing high-purity quartz sand. Usually, during the mining process, the surface and interior of the vein quartz ore body carry a large amount of iron oxides. In the actual production and processing process, the roughly broken vein quartz ore is put into the pickling soaking tank, and the iron oxides are removed by long-term soaking by injecting strong acids such as hydrochloric acid, hydrofluoric acid, sulfuric acid, and nitric acid.

[0003] Although the above method can remove the iron oxides on the surface of vein quartz ore, the use of these strong acids will produce a large amount of acidic wastewater containing fluoride ions and chloride ions, causing environmental pollution, while increasing the cost of waste acid and wastewater treatment and the time cost of the factory, and endangering the health of workers during the operation; the iron oxides in vein quartz ore can also be removed by flotation operation, but there is currently no efficient flotation agent, so that a large amount of iron oxides still remain after flotation, and repeated flotation and acid bubbling are required to achieve the purpose of removing the iron oxides, which not only increases the cost of the agent and the workload of the workers, but also causes an increase in the amount of sewage treatment using a large amount of agents. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a flotation agent for vein quartz ore with high efficiency in removing iron, which reacts with iron-containing oxides during the positive flotation process and can effectively remove the iron-containing oxides contained in the vein quartz ore. At the same time, it has the advantages of small dosage of the agent, being environmentally friendly, and having better cost economy than traditional acid bubble process and flotation agents.

[0005] The invention discloses a vein quartz ore flotation agent for efficiently removing iron. The flotation agent is made of mixed amine, ethylenediamine, anhydrous ethanol, polymerized α-D-pyranose glucose and diesel.

[0006] As a preferred embodiment of the present invention, the mixed amine consists of dodecylamine, hexadecylamine and behenylamine.

[0007] As a preferred embodiment of the present invention, the weight ratio of dodecylamine:hexadecylamine:behenylamine is 18-22:3-4:1-2.

[0008] As the main component, dodecylamine has a shorter carbon chain (C12) and higher chemical activity. It can be quickly adsorbed on the surface of the target mineral, significantly improving the capture capacity. It has good solubility in the slurry, strong dispersibility, and can act evenly on the mineral particles; hexadecylamine (C16) is added in an appropriate amount to enhance the hydrophobicity of the mixed amines, further improving the hydrophobic modification effect of the mineral particles. Its longer carbon chain forms a more stable hydrophobic layer on the mineral surface, forming a synergistic effect with dodecylamine; although dodecylamine (C22) has a longer carbon chain, it has poor solubility. Controlling the ratio between 1 and 2 can enhance the hydrophobic contribution of long-chain amines in flotation without causing excessive viscosity of the reagent or reduced efficiency due to excessive dosage. This ratio design can form a more uniform and stable hydrophobic film on the mineral surface, improving the floating ability of mineral particles.

[0009] As a preferred embodiment of the present invention, a method for preparing a flotation agent comprises:

[0010] Mix the mixed amine, ethylenediamine and anhydrous ethanol in proportion in a preparation barrel;

[0011] Add diesel, heat and stir at constant temperature for 1-2h;

[0012] After cooling, add polymerized α-D-pyranose and stir well to complete the preparation.

[0013] As a preferred embodiment of the present invention, the amount of diesel added is 2-5% of the total volume of the mixed amine, ethylenediamine and anhydrous ethanol;

[0014] In the present invention, N-(2-hydroxyethyl)-N-dodecylethylenediamine is generated by the reaction of mixed amine, ethylenediamine and ethanol. N-(2-hydroxyethyl)-N-dodecylethylenediamine contains hydrophilic hydroxyl groups and hydrophobic alkyl chains. Its amphiphilic structure enables it to be effectively adsorbed on the surface of minerals, significantly enhancing the capture capacity. Its long alkyl chain increases the hydrophobic modification of the mineral surface, thereby improving the adhesion of mineral particles on bubbles.

[0015] During the flotation process of vein quartz ore, its chemical structure has a strong affinity for iron impurities, thereby improving the removal efficiency of iron impurities. Specifically, due to the presence of hydroxyethyl, the compound forms a specific adsorption with the mineral surface, thereby reducing the adsorption of non-target minerals and improving the selectivity of the flotation process.

[0016] Polymerized α-D-pyranose has good adsorption properties and can selectively adsorb on the surface of non-target minerals (such as gangue surfaces), thereby inhibiting their hydrophobicity and flotation ability. The hydroxyl groups (-OH) in the molecules are combined with the active sites on the surface of non-target minerals (such as silicon, aluminum or other oxide groups) through hydrogen bonds or van der Waals forces to form a stable adsorption layer. This adsorption shields the active sites on the surface of the mineral and prevents the further action of the collector. The hydrophilic film formed by the polymer on the surface of the mineral can increase the surface hydrophilicity, thereby reducing the hydrophobicity and flotation tendency of the mineral particles.

[0017] As a solvent, ethanol helps other ingredients to be better dissolved and evenly distributed in the slurry, ensuring the effectiveness of the reagent. It can also play a certain role in foam regulation and control the amount and stability of foam generated during flotation. During the preparation process, ethanol, as a reactant, can react with mixed amines and ethylenediamine to generate N-(2-hydroxyethyl)-N-alkylethylenediamine, thereby improving the activity and selectivity of the collector.

[0018] As an efficient foaming agent, diesel can generate a stable foam layer during the flotation process. An addition amount of 2-5% is sufficient to form sufficient foam so that mineral particles adhere to and float to the surface of the pulp, but not too much to cause excessive foam. The components of diesel include (E)-5-((5-phenylfuran-2-yl)methylene)furan-2(5H)-one, N-(1-isopropyl-1H-pyrazol-4-yl)-2-(4-nitro-1H-pyrazol-1-yl)acetamide and (13R, 14S)-13-ethyl-3-methoxy-12,13,15,16-tetrahydro-11H-cyclopenta[a]phenanthrene-17 (14H)-ketone; the above compounds have a complex molecular structure, including a polar head (such as a carbonyl group, a nitro group, an ester group, etc.) and a non-polar tail (such as a long-chain alkyl group, an aromatic ring, etc.). This amphiphilicity enables them to be adsorbed on the gas-liquid interface, reducing the interfacial tension, thereby promoting the formation of foam, and forming a layer of three-dimensional barriers on the bubble surface to prevent the bubbles from merging, especially the macrocyclic compound (13R, 14S)-13-ethyl-3-methoxy-12,13,15,16-tetrahydro-11H-cyclopenta[a]phenanthrene-17(14H)-one, whose larger molecular size can effectively occupy space and increase the stability of the bubbles.

[0019] As a preferred embodiment of the present invention, the temperature of the constant temperature stirring is 60-90°C;

[0020] Appropriate heating can reduce the viscosity of the solution, making it easier to evenly disperse the components and ensuring that the agent can play a better role in subsequent use. In the temperature range of 60-90°C, the solubility of solvents such as ethanol is enhanced, which helps amine collectors and ethylenediamine to dissolve more quickly in the solvent to form a uniform solution; 60-90°C is a relatively mild heating temperature range, which is high enough to promote dissolution and mixing, but not too high to cause decomposition or deterioration of active ingredients; for example, too high a temperature may cause the volatilization or degradation of amine substances, affecting the effectiveness of the agent.

[0021] As a preferred embodiment of the present invention, the pH range of the flotation reagent is 4-10. The pH condition affects the surface activity of the collector and the frother. The stability of the foam layer can be maintained within the range of 4-10, ensuring that the mineral particles can be effectively carried to the surface of the pulp. In addition, a pH of 4-10 usually does not require a large amount of adjustment of the acidity and alkalinity of the pulp, which reduces the consumption of acid or alkali and reduces costs.

[0022] As a preferred embodiment of the present invention, the addition ratios of mixed amine, ethylenediamine, anhydrous ethanol and polymerized α-D-pyranose are 40%-60%, 20%-40%, 20%-30% and 5%-10% respectively by weight.

[0023] The ratio of 40%-60% of mixed amines ensures sufficient collector dosage to achieve efficient mineral separation while avoiding waste caused by excessive use or over-flotation of non-target minerals. Ethylenediamine, as an auxiliary agent, can synergize with mixed amines and enhance the capture of target minerals through its diamino structure and combination with mineral surface or collector. It provides mineral surface modification and increases the floatability difference between minerals, thereby improving flotation selectivity. The addition ratio of 20%-40% can not only play a synergistic role, but also avoid the increase in reagent cost or negative impact on foam stability caused by excessive use of ethylenediamine. 20%-30% of anhydrous ethanol ensures sufficient dissolution and dispersion effect while controlling reagent cost and volatility.

[0024] Polymerized α-D-pyranose glucose is used as a foam stabilizer, which can extend the life of the foam and make it easier for the target mineral particles to be carried to the surface of the slurry. It has a selective adsorption and inhibition effect on non-target minerals (such as iron impurities), improving the recovery rate and purity of the target minerals. The ratio of 5%-10% is the optimal dosage of foam stabilizers and inhibitors, which can not only play an effective role, but also avoid excessive addition that causes excessive foam or interferes with the capture process.

[0025] As a preferred embodiment of the present invention, during flotation, the flotation reagent is added in a ratio of 2 kg of flotation reagent per ton of quartz sand.

[0026] As a preferred embodiment of the present invention, quartz sand needs to be crushed to within 80-180 meshes; particles of appropriate size are more likely to adhere to bubbles and float up with the bubbles, while particles that are too large may sink due to gravity, affecting the flotation effect; while particles that are too small may lead to excessive dispersion and are not easy to form a stable foam layer; by crushing quartz sand to 80-180 meshes, the minerals can be fully dissociated, so that iron-containing oxides are more exposed on the surface, which is convenient for collector adsorption and bubble attachment, thereby improving the flotation efficiency.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The present invention optimizes the reagent ratio and preparation method, and the flotation reagent has strong selectivity and capture ability for iron impurities in vein quartz ore, significantly improves the iron removal efficiency, and can effectively separate non-target minerals, improve the purity of target minerals, and meet the requirements of high-quality ore.

[0029] (2) The present invention removes iron oxides by using a highly efficient flotation agent, thereby avoiding the use of strong acid, thereby significantly reducing the generation of acidic wastewater, which not only reduces the pollution to water bodies and soil, but also reduces the difficulty and cost of sewage treatment;

[0030] (3) As collectors, N-(2-hydroxyethyl)-N-dodecylethylenediamine, dodecylamine, hexadecylamine and docosylamine can selectively adsorb to the surface of iron oxides to form a hydrophobic layer, increase the adhesion between minerals and bubbles, and thus improve flotation efficiency; synergistic effect of multiple amines: amines of different chain lengths and structures cover a wider range of mineral types, enhancing the selectivity and adsorption performance of different types of iron oxides, ensuring efficient removal; polymerized α-D-pyranose glucose as a polysaccharide inhibitor can form a protective film on the surface of non-target minerals (such as silicates), preventing the adsorption of collectors and thus inhibiting the flotation of these minerals, which not only improves the selectivity and purity of the concentrate, but also reduces unnecessary repeated flotation; on this basis, diesel is used to stabilize the foam structure, prolong the foam life, and ensure that mineral particles have more time to attach to the bubbles and be floated out. DETAILED DESCRIPTION

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] In the examples of the present invention, the sources of commercially available materials are as follows:

[0034]

[0035]

[0036] Embodiment 1:

[0037] The invention discloses a vein quartz ore flotation agent for efficiently removing iron. The flotation agent is made of mixed amine, ethylenediamine, anhydrous ethanol, polymerized α-D-pyranose glucose and diesel, wherein the mixed amine comprises 40%, ethylenediamine comprises 30%, anhydrous ethanol comprises 25% and polymerized α-D-pyranose glucose comprises 5%.

[0038] The pH range of the flotation reagent is 4.5-5.5.

[0039] The mixed amine is prepared by mixing dodecylamine, hexadecylamine and behenylamine in a mass ratio of 18:4:2.

[0040] The preparation method of flotation reagent is as follows:

[0041] The above-mentioned mixed amine, ethylenediamine and anhydrous ethanol are mixed evenly in a preparation barrel according to a certain proportion, and then 2.4% of the total volume of diesel is added, and the mixture is heated and stirred at a constant temperature of 85°C for 2 hours. After cooling, the polymerized α-D-pyranose glucose aqueous solution is added and stirred evenly to complete the preparation;

[0042] The main components of the final flotation reagent obtained are shown in Table 1:

[0043] Serial number name content(%) 1 N-(2-Hydroxyethyl)-N-dodecylethylenediamine 57.2 2 Dodecylamine 12.4 3 Hexadecylamine 7.8 4 Polymeric α-D-glucopyranose 6 5 Ethanol 3.3 6 diesel fuel 3.8 7 Ethylenediamine 5.8 8 Behenylamine 1.4

[0044] Table 1

[0045] The method of using flotation reagent is:

[0046] The quartz sand is fed into the flotation machine through a quantitative feeder, and 2 kg of flotation reagent is added into the flotation machine per ton of quartz sand (particle size is 80-180 mesh). After stirring for two minutes, it is output into the flotation machine for aeration flotation. The quartz sand floats out in the form of foam, and the iron-containing impurities remain in the flotation machine.

[0047] Flotation effect:

[0048] The output rate of quartz sand reaches 96.8%. The composition of quartz sand is tested as follows: SiO2 99.91%, Fe element content 11PPM.

[0049] Embodiment 2:

[0050] The invention discloses a vein quartz ore flotation agent for efficiently removing iron. The flotation agent is made of mixed amine, ethylenediamine, anhydrous ethanol, polymerized α-D-pyranose glucose and diesel, wherein the mixed amine comprises 50%, ethylenediamine comprises 25%, anhydrous ethanol comprises 20% and polymerized α-D-pyranose glucose comprises 5%.

[0051] The pH range of the flotation reagent is 5.5-6.5.

[0052] The mixed amine is prepared by mixing dodecylamine, hexadecylamine and docosylamine in a mass ratio of 20:3.5:1.5.

[0053] The preparation method of flotation reagent is as follows:

[0054] The above-mentioned mixed amine, ethylenediamine and anhydrous ethanol are mixed evenly in a preparation barrel according to a certain proportion, and then 2.4% of the total volume of diesel is added, and the mixture is heated and stirred at a constant temperature of 85°C for 2 hours. After cooling, the polymerized α-D-pyranose glucose aqueous solution is added and stirred evenly to complete the preparation;

[0055] The main components of the final flotation reagent are shown in Table 2:

[0056] Serial number name content(%) 1 N-(2-Hydroxyethyl)-N-dodecylethylenediamine 57.6 2 Dodecylamine 12.8 3 Hexadecylamine 7.3 4 Polymeric α-D-glucopyranose 5 5 Ethanol 3 6 diesel fuel 6.4 7 Ethylenediamine 4.3 8 Behenylamine 2.9

[0057] Table 2

[0058] The method of using flotation reagent is:

[0059] The quartz sand is fed into the flotation machine through a quantitative feeder, and 2 kg of flotation reagent is added into the flotation machine per ton of quartz sand (particle size is 80-180 mesh). After stirring for two minutes, it is output into the flotation machine for aeration flotation. The quartz sand floats out in the form of foam, and the iron-containing impurities remain in the flotation machine.

[0060] Flotation effect:

[0061] The output rate of quartz sand reaches 95.4%. The composition of quartz sand is tested as follows: SiO2 99.97%, Fe element content 5PPM.

[0062] By using the flotation reagent of the present invention, the Fe content in the quartz sand is greatly reduced. In Example 1, the Fe content is reduced to 11 PPM; and in Example 2 after the optimized formula, it is further reduced to 5 PPM, which shows that the reagent can very effectively remove iron oxides and significantly improve the purity of the quartz sand. Due to the high efficiency of the reagent formula, the ideal iron removal effect can be achieved in one flotation, without repeated flotation or acid bubble treatment, which further saves the amount of reagent used and the workload of workers, and reduces the overall production cost.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A flotation agent for vein quartz ore with high efficiency in removing iron, characterized in that: The flotation reagent is made of mixed amine, ethylenediamine, anhydrous ethanol, polymerized α-D-pyranose glucose and diesel.

2. The vein quartz ore flotation agent for high-efficiency iron removal according to claim 1, characterized in that: The pH range of the flotation reagent is 4-10.

3. The vein quartz ore flotation agent for high-efficiency iron removal according to claim 1, characterized in that: In terms of weight percentage, the added proportions of the mixed amine, ethylenediamine, anhydrous ethanol and polymerized α-D-pyranose are 40%-60%, 20%-40%, 20%-30% and 5%-10% respectively.

4. The vein quartz ore flotation agent for efficient iron removal according to claim 1, characterized in that: The mixed amine consists of dodecylamine, hexadecylamine and behenylamine.

5. The vein quartz ore flotation agent for efficient iron removal according to claim 2, characterized in that: The weight ratio of the dodecylamine: hexadecylamine: behenylamine is 18-22: 3-4: 1-2.

6. The vein quartz ore flotation agent for high-efficiency iron removal according to claim 1, characterized in that: The preparation method of the flotation reagent comprises: Mix the mixed amine, ethylenediamine and anhydrous ethanol in proportion in a preparation barrel; Add diesel, heat and stir at constant temperature for 1-2h; After cooling, add polymerized α-D-pyranose and stir well to complete the preparation.

7. The vein quartz ore flotation agent for high-efficiency iron removal according to claim 6, characterized in that: The added amount of the diesel is 2-5% of the total volume of the mixed amine, ethylenediamine and anhydrous ethanol.

8. The vein quartz ore flotation agent for high-efficiency iron removal according to claim 6, characterized in that: The temperature of the constant temperature stirring is 60-90°C.

9. The method for using the vein quartz ore flotation agent for efficient iron removal according to any one of claims 1 to 8, characterized in that: During flotation, the flotation agent is added in a ratio of 2 kg per ton of quartz sand.

10. The method for using the vein quartz ore flotation agent for high-efficiency iron removal according to claim 9, characterized in that: The quartz sand needs to be crushed to within 80-180 mesh.

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