CN-117138963-B - Microemulsion type coal flotation collector based on dynamic covalent bonds and preparation method and application thereof

Abstract

The invention belongs to the technical field of flotation reagents, and provides a dynamic covalent bond-based microemulsion type coal flotation collector, and a preparation method and application thereof. The collector consists of hydrocarbon oil collector 20-40 weight portions, emulsifier 8-20 weight portions, water 22-60 weight portions and alkali 0.5-2 weight portions. The emulsifier of the microemulsion type coal flotation collector consists of a conventional nonionic surfactant and an anionic surfactant formed based on dynamic covalent bonds, and has excellent emulsifying performance. The prepared microemulsion has an average droplet size smaller than 100nm, can be still kept at a nano level after being diluted by 1-100 times by water, and has a higher specific surface area compared with a conventional emulsion collector. The contact probability of the collector oil drops and the coal particles can be remarkably improved in the coal flotation process, the flotation effect is improved, and the consumption of the collector is reduced.

Inventors

• LI ZHE
• GUI XIAHUI
• XING YAOWEN
• WEI ZHAO
• YANG HAICHANG
• WANG LEI
• Wang Yusai
• LIU JINCHENG
• KONG YIBO

Assignees

• 中国矿业大学

Dates

Publication Date

20260508

Application Date

20231020

Claims (4)

1. 1. The microemulsion type coal flotation collector based on dynamic covalent bonds is characterized by comprising, by weight, 20-40 parts of hydrocarbon oil collector, 8-20 parts of emulsifier, 22-60 parts of water and 0.5-2 parts of alkali; The hydrocarbon oil collector is any one or a mixture of kerosene, diesel oil and gasoline; The emulsifier is a combination of nonionic surfactant and anionic surfactant, and the mass ratio of the nonionic surfactant to the anionic surfactant is (0.5-5): 1; The nonionic surfactant is lauryl glucoside, sorbitan fatty acid ester, polyoxyethylene octyl phenol ether-10, sorbitan monooleate polyoxyethylene ether or fatty alcohol polyoxyethylene ether; The anionic surfactant is formed spontaneously by generating dynamic covalent bonds from p-hydroxybenzaldehyde and n-hexylamine in an alkaline environment; the microemulsion type coal flotation collector is a homogeneous microemulsion, the average droplet size is less than 100nm, and the microemulsion type coal flotation collector can still be kept at the nano level after being diluted by 1-100 times by water.
2. 2. The dynamic covalent bond-based microemulsion coal flotation collector of claim 1, wherein the base is sodium hydroxide, potassium hydroxide or sodium carbonate.
3. 3. The method for preparing the dynamic covalent bond-based microemulsion type coal flotation collector as claimed in any one of claims 1 to 2, which is characterized by comprising the following steps: Adding 20-40 parts of hydrocarbon oil collector, 8-20 parts of emulsifier, 22-60 parts of water and 0.5-2 parts of alkali into a container in sequence, and stirring at a rotating speed of 50-200r/min for 5-30 min until homogeneous microemulsion is obtained, namely the dynamic covalent bond-based microemulsion type coal flotation collector.
4. 4. Use of the dynamic covalent bond-based microemulsion molded coal flotation collector of claim 1 for coal flotation.

Description

Microemulsion type coal flotation collector based on dynamic covalent bonds and preparation method and application thereof Technical Field The invention belongs to the technical field of flotation reagents, and particularly relates to a dynamic covalent bond-based microemulsion type coal flotation collector, and a preparation method and application thereof. Background Flotation is a separation method based on the difference in physical and chemical properties between valuable minerals and the surface of the unwanted gangue. The flotation reagent plays a great role in regulating and controlling the interfacial properties of coal and mineral impurities, improving the flotation rate, strengthening the selective recovery of coal particles and improving the flotation effect. Hydrocarbon oil collectors such as kerosene and light diesel are most commonly used for flotation, and cannot form a fine dispersed phase due to poor dispersibility in water due to their own hydrophobicity. The emulsification is to disperse two mutually insoluble liquids to form stable emulsion for a certain period of time. A great number of theories and practices prove that the smaller the oil drops dispersed in the ore pulp, the larger the specific surface area, the larger the number of the oil drops, the larger the probability of the oil drops contacting with coal particles, the easier the oil film can be formed on the hydrophobic coal particles, the better the flotation effect, and the reduction of the consumption of the collector is facilitated. However, at present, hydrocarbon oil collectors are usually forcedly dispersed in coal slurry by a mechanical stirring mode, so that the dispersed collector oil drops are large in quantity and small in collision probability with coal particles, and the formed oil drops are greatly coalesced in a short time, so that a considerable part of the collectors cannot play a role, are discharged along with tailings, the acting efficiency of the collectors is reduced, and the subsequent coal slime water treatment cost is increased. Disclosure of Invention In order to improve the emulsification effect of hydrocarbon oil collectors and reduce the droplet size of emulsion, the invention provides a microemulsion type coal flotation collector based on dynamic covalent bonds, and a preparation method and application thereof. The micro-emulsion type coal flotation collector is prepared by taking hydrocarbon oil collector as an oil phase and solution containing emulsifier as a water phase. The emulsifier contains both conventional nonionic surfactant and anionic surfactant based on dynamic covalent bond formation, and the two surfactants have synergistic effect, so that the oil-water emulsification effect is obviously improved, and the formation of microemulsion is facilitated. And the water can be diluted by 1-100 times and still can be kept at the nano level, compared with the conventional emulsion type collector, the collector has higher specific surface area, the contact probability of oil drops of the collector and coal particles can be remarkably improved in the coal flotation process, the flotation effect is improved, and the consumption of the collector is reduced. The invention is realized by the following technical scheme: The dynamic covalent bond-based microemulsion type coal flotation collector comprises, by weight, 20-40 parts of hydrocarbon oil collector, 8-20 parts of emulsifier, 22-60 parts of water and 0.5-2 parts of alkali. The emulsifier is a combination of nonionic surfactant and anionic surfactant, and the mass ratio of the nonionic surfactant to the anionic surfactant is (0.5-5): 1. The nonionic surfactant is lauryl glucoside, sorbitan fatty acid ester, polyoxyethylene octyl phenol ether-10, sorbitan monooleate polyoxyethylene ether or fatty alcohol polyoxyethylene ether. The anionic surfactant is formed spontaneously by the generation of dynamic covalent bonds between aromatic aldehyde and primary amine in an alkaline environment. Wherein the aromatic aldehyde is p-hydroxybenzaldehyde or p-carboxybenzaldehyde, and the primary amine is n-hexylamine or n-octylamine. The hydrocarbon oil collector is any one or a mixture of kerosene, diesel oil and gasoline. . The alkali comprises sodium hydroxide, potassium hydroxide or sodium carbonate. A preparation method of a microemulsion type coal flotation collector based on dynamic covalent bonds comprises the following steps: Adding 20-40 parts of hydrocarbon oil collector, 8-20 parts of emulsifier, 22-60 parts of water and 0.5-2 parts of alkali into a container in sequence, and stirring at a rotating speed of 50-200r/min for 5-30min until homogeneous microemulsion is obtained, namely the dynamic covalent bond-based microemulsion type coal flotation collector. The microemulsion type coal flotation collector based on dynamic covalent bonds, which is obtained by the invention, can be diluted by water for 1-100 times according to the conditions of ore p