Environment-friendly efficient collecting agent and preparation method and application thereof

Abstract

The invention relates to the field of coal washing materials, and particularly discloses an environment-friendly efficient collecting agent and a preparation method and application thereof. The environment-friendly efficient collecting agent comprises the following raw material components in parts by mass: 30-50 parts of base oil, 3-10 parts of an emulsifier, 1-5 parts of an inorganic accelerant and 40-60 parts of deionized water, wherein the emulsifying agent is prepared from lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, petroleum sodium sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate; the inorganic accelerant comprises sodium silicate and sodium sulfide. According to the coal washing collecting agent, the problems that an existing common coal washing collecting agent is not ideal in effect, large in agent consumption and not beneficial to environmental protection are solved, and a new thought is provided for coal washing.

Description

Technical Field

[0001] The invention relates to the field of coal washing materials, and specifically discloses an environmentally friendly and efficient collector, a preparation method and application thereof. Background Art

[0002] As one of the main energy sources in my country, coal occupies an important position in the national economy. However, raw coal often contains a large amount of impurities, such as gangue. These impurities not only affect the quality and utilization efficiency of coal, but also cause serious pollution to the environment. Therefore, coal washing, as an important link in coal processing, can effectively remove impurities in raw coal and improve coal quality, which has important economic, social and environmental significance.

[0003] The existing coal washing mostly adopts the method of adding collectors to change the hydrophobicity of the coal surface, improve the floatability of coal, and realize the effective separation of coal and impurities. Coal has natural hydrophobicity, while the surface of impurities such as gangue is usually hydrophilic. Collectors can selectively adsorb on the surface of coal particles, enhance the hydrophobicity of coal particles, and make them more easily attached to bubbles; at the same time, by changing the surface properties of gangue, the difference in wettability between coal and gangue surfaces can be further expanded, so that coal particles float up under the carrying of bubbles, while impurities such as gangue remain in the slurry, realizing the separation of coal and gangue. Most of the collectors currently used are petroleum products, mainly including kerosene, light diesel, gasoline or natural gas condensate, etc. These substances can be adsorbed on the surface of coal particles to form an oil film to enhance the hydrophobicity of the surface of coal particles, so that they can firmly adhere to the surface of bubbles to form mineralized bubbles, and then separate from hydrophilic gangue. However, my country's oil resources are relatively scarce, and coal washing generally has problems such as large flow, low concentration and high chemical consumption. The large-scale use of collectors is not conducive to environmental protection. Moreover, different oil types have different molecular weights of hydrocarbons and different flotation effects. The oil film formed by low molecular weight oils is unstable, resulting in unsatisfactory separation effects and increased flotation costs.

[0004] Based on this, in order to alleviate the contradiction between energy supply and demand and relieve the pressure of environmental protection, it is of great significance to study a green and environmentally friendly collector that can reduce the use of petroleum products. Summary of the invention

[0005] In view of the fact that the existing commonly used coal washing collectors have unsatisfactory effects and large consumption of reagents, which is not conducive to environmental protection, the present invention provides an environmentally friendly and efficient collector and its preparation method and application. The environmentally friendly and efficient collector includes base oil, emulsifier, inorganic promoter and deionized water; wherein the emulsifier includes lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium coconut oil; the inorganic promoter includes sodium silicate and sodium sulfide. The present invention utilizes the synergistic effect of each component, which not only effectively improves the coal washing efficiency of the collector, but also does not require the use of a large amount of reagents, avoiding the problem of high reagent consumption that is not conducive to environmental friendliness.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: The first aspect of the present invention provides an environmentally friendly and efficient collector, comprising the following raw material components in parts by weight: 30-50 parts of base oil, 3-10 parts of emulsifier, 1-5 parts of inorganic accelerator and 40-60 parts of deionized water; wherein the emulsifier comprises lauryl amidopropyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate; and the inorganic accelerator comprises sodium silicate and sodium sulfide.

[0007] Compared with the prior art, the present invention uses base oil, emulsifier and inorganic accelerator as main raw materials to prepare an environmentally friendly and efficient collector, wherein the raw materials of the emulsifier include lauryl amidopropyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate. The base oil has low surface tension and good hydrophobicity, and can form a hydrophobic oil film on the surface of coal particles to reduce the hydration of the surface of coal particles. However, the interfacial tension of the base oil is relatively large, and it is difficult to disperse spontaneously in the slurry. By adding a suitable emulsifier, the interfacial tension between oil droplets can be reduced, and their mutual aggregation tendency can be reduced, so that the collector is much easier to disperse in the slurry, and the contact area with the coal particles is increased. The chemical structure of lauryl amidopropyl betaine contains lipophilic lauryl long-chain alkyl, which has good affinity with the oil phase; at the same time, it contains hydrophilic betaine groups, in which quaternary ammonium cations and carboxyl anions form an inner salt structure, giving it good hydrophilicity. This unique zwitterionic structure makes it both lipophilic and hydrophilic. Sodium petroleum sulfonate also has similar properties, which can effectively reduce the interfacial tension between oil droplets. After alkylphenol polyoxyethylene ether is adsorbed on the surface of oil droplets, the polyoxyethylene chain stretches in the water phase to form a hydration layer with a certain thickness, like a space barrier, preventing the mutual collision and polymerization between oil droplets. Due to the presence of sulfonate groups in the molecule, fatty acid methyl ester ethoxylate sulfonate is not easy to combine with calcium and magnesium ions to form precipitation in hard water. It has better hard water resistance and can maintain stable emulsification ability in complex slurries; potassium cocoate has a strong ability to reduce surface tension and can quickly adsorb on the oil-water interface. Its raw materials are derived from natural coconut oil. Potassium cocoate has good biodegradability and is environmentally friendly.

[0008] The addition of inorganic accelerators can adjust the pulp environment, improve the hydrophobicity of the coal surface, and facilitate flotation. It can also change the ionic strength of the pulp, thereby affecting the thickness and stability of the hydration film on the surface of the coal particles, which is conducive to the contact and attachment of coal particles to bubbles. More importantly, inorganic accelerators can also chemically react with impurity minerals, prevent the action of collectors on impurity minerals, improve the flotation selectivity of coal and the flotation efficiency of reagents, and avoid a large amount of reagent consumption. Among them, sodium silicate can disperse the fine mud and impurities in the pulp, prevent them from interfering with the attachment of coal particles to bubbles, and can inhibit the flotation of certain impurity minerals and improve the flotation efficiency. Sodium sulfide can react with the oxides on the coal surface, so that the hydrophobicity of the coal surface is enhanced to a certain extent, which is conducive to the adsorption and action of collectors, improves the flotation efficiency of collectors, and reduces the amount of reagents used.

[0009] Preferably, the mass ratio of lauryl amidopropyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate in the emulsifier is 2-3:1-3:10:10:1.

[0010] Preferably, the mass ratio of sodium silicate to sodium sulfide in the inorganic accelerator is 1:2-1:3.

[0011] Preferably, the base oil comprises kerosene and vegetable oil in a volume ratio of 1:1-1:1.2.

[0012] Preferably, the raw material components are included in the following parts by weight: 35-45 parts of base oil, 4-7 parts of emulsifier, 2-4 parts of inorganic accelerator and 45-55 parts of deionized water.

[0013] The second aspect of the present invention provides a method for preparing the environmentally friendly and efficient collector, comprising the following steps: Step 1, weigh lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate according to the designed ratio, mix them evenly to obtain an emulsifier; Step 2: weigh kerosene and vegetable oil according to the designed ratio, mix them evenly, and obtain base oil; weigh sodium silicate and sodium sulfide according to the designed ratio, mix them evenly, and obtain inorganic accelerator; Step 3: Evenly mix the emulsifier, base oil, inorganic accelerator and deionized water according to the designed ratio, and then use a colloid mill for high-speed blending to obtain an environmentally friendly and efficient collector.

[0014] The colloid mill has a specific rotor and stator structure. When the fluid enters the gap between the rotor and the stator, it is affected by the dual effects of gravity and the rotor, and the fluid and the stator teeth produce strong and repeated collisions. It can crush, disperse and emulsify particles, polymers or suspensions in a short time to achieve the purpose of refining materials. The colloid mill is easy to operate and maintain, has a small size and high processing precision, can improve the stability of the collector, and provides a new idea for the preparation of the collector.

[0015] Preferably, in step three, the rotation speed of the high-speed blending is 6500rpm-7500rpm.

[0016] Preferably, in step three, the rated voltage of the colloid mill is 200V-220V, and the motor power of the colloid mill is 1.5kW-1.6kW.

[0017] The third aspect of the present invention provides an application of the environmentally friendly and efficient collector or the environmentally friendly and efficient collector prepared by the preparation method of the environmentally friendly and efficient collector in coal washing. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1 This embodiment provides an environmentally friendly and efficient collector, which specifically includes the following contents: The environmentally friendly and efficient collector comprises the following raw material components in parts by mass: 40 parts of base oil, 5 parts of emulsifier, 3 parts of inorganic accelerator and 55 parts of deionized water; wherein the mass ratio of lauryl amidopropyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate in the emulsifier is 2:2:10:10:1; the base oil comprises kerosene and soybean oil in a volume ratio of 1:1; the mass ratio of sodium silicate and sodium sulfide in the inorganic accelerator is 1:2.5.

[0020] The preparation method of the environmentally friendly and efficient collector comprises the following steps: Step 1, weigh lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate according to the designed ratio, mix them evenly to obtain an emulsifier; Step 2: weigh kerosene and vegetable oil according to the designed ratio, mix them evenly, and obtain base oil; weigh sodium silicate and sodium sulfide according to the designed ratio, mix them evenly, and obtain inorganic accelerator; Step 3: Mix the emulsifier, base oil, inorganic accelerator and deionized water evenly according to the designed ratio, set the rated voltage of the colloid mill to 220V, the motor power to 1.5kW, and perform secondary high-speed blending on the mixture at a speed of 7000rpm for 8min to obtain an environmentally friendly and efficient collector.

[0021] Example 2 This embodiment provides an environmentally friendly and efficient collector, which specifically includes the following contents: The environmentally friendly and efficient collector comprises the following raw material components in parts by mass: 35 parts of base oil, 7 parts of emulsifier, 4 parts of inorganic accelerator and 45 parts of deionized water; wherein the mass ratio of lauryl amidopropyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate in the emulsifier is 2:3:10:10:1; the base oil comprises kerosene and soybean oil in a volume ratio of 1:1.2; the mass ratio of sodium silicate and sodium sulfide in the inorganic accelerator is 1:2.

[0022] The preparation method of the environmentally friendly and efficient collector comprises the following steps: Step 1, weigh lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate according to the designed ratio, mix them evenly to obtain an emulsifier; Step 2: weigh kerosene and vegetable oil according to the designed ratio, mix them evenly, and obtain base oil; weigh sodium silicate and sodium sulfide according to the designed ratio, mix them evenly, and obtain inorganic accelerator; Step 3: Mix the emulsifier, base oil, inorganic accelerator and deionized water evenly according to the designed ratio, set the rated voltage of the colloid mill to 220V, the motor power to 1.6kW, and perform secondary high-speed blending on the mixture at a speed of 6500rpm for 8min to obtain an environmentally friendly and efficient collector.

[0023] Example 3 This embodiment provides an environmentally friendly and efficient collector, which specifically includes the following contents: The environmentally friendly and efficient collector comprises the following raw material components in parts by mass: 45 parts of base oil, 4 parts of emulsifier, 2 parts of inorganic accelerator and 50 parts of deionized water; wherein the mass ratio of lauryl amidopropyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate in the emulsifier is 3:2:10:10:1; the base oil comprises kerosene and soybean oil in a volume ratio of 1:1; the mass ratio of sodium silicate and sodium sulfide in the inorganic accelerator is 1:3.

[0024] The preparation method of the environmentally friendly and efficient collector comprises the following steps: Step 1, weigh lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate according to the designed ratio, mix them evenly to obtain an emulsifier; Step 2: weigh kerosene and vegetable oil according to the designed ratio, mix them evenly, and obtain base oil; weigh sodium silicate and sodium sulfide according to the designed ratio, mix them evenly, and obtain inorganic accelerator; Step 3: Mix the emulsifier, base oil, inorganic accelerator and deionized water evenly according to the designed ratio, set the rated voltage of the colloid mill to 220V, the motor power to 1.5kW, and perform secondary high-speed blending on the mixture at a speed of 6500rpm for 10min to obtain an environmentally friendly and efficient collector.

[0025] Example 4 This embodiment provides an environmentally friendly and efficient collector, which is different from the embodiment 1 in that the base oil is replaced with light diesel oil, and specifically includes the following contents: The environmentally friendly and efficient collector includes the following raw material components in parts by weight: 40 parts of light diesel, 5 parts of emulsifier, 3 parts of inorganic accelerator and 55 parts of deionized water; wherein the mass ratio of lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate in the emulsifier is 2:2:10:10:1; the mass ratio of sodium silicate and sodium sulfide in the inorganic accelerator is 1:2.5.

[0026] The preparation method of the environmentally friendly and efficient collector comprises the following steps: Step 1, weigh lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate according to the designed ratio, mix them evenly to obtain an emulsifier; Step 2: Weigh sodium silicate and sodium sulfide according to the designed ratio, mix them evenly, and obtain an inorganic accelerator; Step 3: Mix the emulsifier, light diesel oil, inorganic accelerator and deionized water evenly according to the designed ratio, set the rated voltage of the colloid mill to 220V, the motor power to 1.5kW, and perform secondary high-speed blending on the mixture at a speed of 7000rpm for 8min to obtain an environmentally friendly and efficient collector.

[0027] Comparative Example 1 This comparative example provides an environmentally friendly and efficient collector, which differs from Example 1 in that the emulsifier is replaced with an equal amount of sodium dodecylbenzene sulfonate, specifically including the following contents: The environmentally friendly and efficient collector comprises the following raw material components in parts by mass: 40 parts of base oil, 5 parts of sodium dodecylbenzene sulfonate, 3 parts of inorganic accelerator and 55 parts of deionized water; wherein the base oil comprises kerosene and soybean oil in a volume ratio of 1:1; the mass ratio of sodium silicate and sodium sulfide in the inorganic accelerator is 1:2.5.

[0028] The preparation method of the environmentally friendly and efficient collector comprises the following steps: Step 1: weigh kerosene and vegetable oil according to the designed ratio, mix them evenly, and obtain base oil; weigh sodium silicate and sodium sulfide according to the designed ratio, mix them evenly, and obtain inorganic accelerator; Step 3: Mix sodium dodecylbenzene sulfonate, base oil, inorganic accelerator and deionized water evenly according to the designed ratio, set the rated voltage of the colloid mill to 220V, the motor power to 1.5kW, and perform secondary high-speed blending on the mixture at a speed of 7000rpm for 8min to obtain an environmentally friendly and efficient collector.

[0029] Comparative Example 2 This comparative example provides an environmentally friendly and efficient collector, which differs from Example 1 in that the inorganic accelerator is replaced with an equal amount of calcium chloride, specifically including the following contents: The environmentally friendly and efficient collector comprises the following raw material components in parts by mass: 40 parts of base oil, 5 parts of emulsifier, 3 parts of calcium chloride and 55 parts of deionized water; wherein the mass ratio of lauryl amidopropyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate in the emulsifier is 2:2:10:10:1; and the base oil comprises kerosene and soybean oil in a volume ratio of 1:1.

[0030] The preparation method of the environmentally friendly and efficient collector comprises the following steps: Step 1, weigh lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate according to the designed ratio, mix them evenly to obtain an emulsifier; Step 2: Weigh kerosene and vegetable oil according to the designed ratio, mix them evenly, and obtain base oil; Step 3: Mix the emulsifier, base oil, calcium chloride and deionized water evenly according to the designed ratio, set the rated voltage of the colloid mill to 220V, the motor power to 1.5kW, and perform secondary high-speed blending on the mixture at a speed of 7000rpm for 8min to obtain an environmentally friendly and efficient collector.

[0031] In order to further reflect the technical effect of the present invention, the present invention carried out performance tests on the environmentally friendly and efficient collectors obtained in Examples 1-4 and Comparative Examples 1-2. The specific operation is as follows: the collectors obtained in each embodiment and comparative example were used to carry out flotation experiments on coal slime, the coal slime source: Dongpang Coal Mine; 2-octanol was used as a frother, and the amount of the frother added was 150 g / t. The experimental results are shown in Table 1.

[0032]

[0033] Table 1 Flotation test results of collectors obtained in various embodiments and comparative examples The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An environmentally friendly and efficient collector, characterized in that: The invention comprises the following raw material components in parts by weight: 30-50 parts of base oil, 3-10 parts of emulsifier, 1-5 parts of inorganic accelerator and 40-60 parts of deionized water; wherein the emulsifier comprises lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate; and the inorganic accelerator comprises sodium silicate and sodium sulfide.

2. The environmentally friendly and efficient collector according to claim 1, characterized in that: The mass ratio of lauryl amidopropyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate in the emulsifier is 2-3:1-3:10:10:

1.

3. The environmentally friendly and efficient collector according to claim 1, characterized in that: The mass ratio of sodium silicate to sodium sulfide in the inorganic accelerator is 1:2-1:

3.

4. The environmentally friendly and efficient collector according to claim 1, characterized in that: The base oil comprises kerosene and vegetable oil in a volume ratio of 1:1-1:1.

2.

5. The environmentally friendly and efficient collector according to any one of claims 1 to 4, characterized in that: The invention comprises the following raw material components in parts by weight: 35-45 parts of base oil, 4-7 parts of emulsifier, 2-4 parts of inorganic accelerator and 45-55 parts of deionized water.

6. The method for preparing an environmentally friendly and efficient collector according to any one of claims 1 to 5, characterized in that: The steps include: Step 1, weigh lauryl amide propyl betaine, alkylphenol polyoxyethylene ether, sodium petroleum sulfonate, fatty acid methyl ester ethoxylate sulfonate and potassium cocoate according to the designed ratio, mix them evenly to obtain an emulsifier; Step 2: weigh kerosene and vegetable oil according to the designed ratio, mix them evenly, and obtain base oil; weigh sodium silicate and sodium sulfide according to the designed ratio, mix them evenly, and obtain inorganic accelerator; Step 3: Evenly mix the emulsifier, base oil, inorganic accelerator and deionized water according to the designed ratio, and then use a colloid mill for high-speed blending to obtain an environmentally friendly and efficient collector.

7. The method for preparing an environmentally friendly and efficient collector according to claim 6, characterized in that: In step three, the rotation speed of the high-speed blending is 6500rpm-7500rpm, and the time of the high-speed blending is 5min-10min.

8. The method for preparing an environmentally friendly and efficient collector according to claim 6, characterized in that: In step 3, the rated voltage of the colloid mill is 200V-220V, and the motor power of the colloid mill is 1.5kW-1.6kW.

9. Use of the environmentally friendly and efficient collector as claimed in any one of claims 1 to 5 or the environmentally friendly and efficient collector prepared by the preparation method of the environmentally friendly and efficient collector as claimed in any one of claims 6 to 8 in coal washing.

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