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CN-121972301-A - Nano lignin-based multifunctional collector and preparation method and application thereof

CN121972301ACN 121972301 ACN121972301 ACN 121972301ACN-121972301-A

Abstract

The application relates to a nano lignin-based multifunctional collector, a preparation method and application thereof, and belongs to the technical field of mineral flotation. The embodiment of the application provides a nano lignin-based multifunctional collector which is prepared from a nano lignin carrier with an average particle size of 50-200 nm through a graft copolymerization reaction and simultaneously loading a sulfhydryl collector component and an amine collector component, wherein the mass ratio of the sulfhydryl collector component to the amine collector component is (1.5:1) - (4:1). According to the application, the high specific surface area of the nano lignin carrier and rich reaction sites are utilized, and two types of collector components with different functions are fixed on the surface of the same nano lignin carrier through graft copolymerization reaction, so that the nano lignin-based multifunctional collector has specific collecting capability on pyrite and silicate minerals, synchronous and efficient removal of pyrite and silicate minerals is realized, and the aluminum-silicon ratio and quality of bauxite concentrate are remarkably improved.

Inventors

  • ZHANG ZHANYUN
  • Du wuxing
  • XU KE
  • ZHANG MENG
  • GUO XIN
  • ZHANG JIANQIANG
  • MA JUNWEI
  • LIU ZHONGYUAN
  • WEI ZHAOBIN
  • ZHANG NAN
  • LI SHASHA
  • YAO JIE

Assignees

  • 中铝郑州有色金属研究院有限公司

Dates

Publication Date
20260505
Application Date
20260403

Claims (10)

  1. 1. The multifunctional nano lignin collector is characterized by being prepared from a nano lignin carrier with an average particle size of 50-200 nm through a graft copolymerization reaction and simultaneously carrying a sulfhydryl collector component and an amine collector component, wherein the mass ratio of the sulfhydryl collector component to the amine collector component is (1.5:1) - (4:1).
  2. 2. The multifunctional collector of claim 1, wherein the thiol collector component is at least one of butyl xanthate, isobutyl xanthate, amyl xanthate, isoamyl xanthate and ethionamide, and the amine collector component is at least one of dodecyl amine, hexadecyl amine and octadecyl amine.
  3. 3. The multifunctional collector of claim 1 or 2, wherein the Zeta potential of the multifunctional collector is +20 mV to +50 mV.
  4. 4. A method for preparing the multifunctional collector according to any one of claims 1 to 3, comprising the steps of: And (3) carrying out graft copolymerization reaction on the mixture of the nano-grade lignin dispersion liquid, the quaternary ammonium salt surfactant, the sulfhydryl collector and the amine collector in the presence of a free radical initiator, wherein the temperature of the graft copolymerization reaction is 60-90 ℃, and the time of the graft copolymerization reaction is 12-36 hours.
  5. 5. The method according to claim 4, wherein the solid content of the nano-sized lignin dispersion is 0.1-wt wt%, and the mass of the quaternary ammonium salt surfactant is 0.5-5 wt% of the mass of the nano-sized lignin dispersion.
  6. 6. The method according to claim 4, wherein a ratio of a total mass of the thiol collector and the amine collector to a mass of the nano-sized lignin solid in the nano-sized lignin dispersion is (5 to 15): 1.
  7. 7. The method according to claim 4, wherein the mass of the radical initiator is 10% -20% of the total mass of the mercapto collector and the amine collector.
  8. 8. The method of claim 4, wherein the quaternary ammonium salt surfactant is at least one of dodecyl trimethyl ammonium bromide, tetradecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide, octadecyl trimethyl ammonium bromide, and the free radical initiator is one of ammonium persulfate, potassium persulfate, and azobisisobutylammonium hydrochloride.
  9. 9. Use of a multifunctional collector according to any one of claims 1-3 in mineral flotation, wherein the multifunctional collector is used for simultaneous removal of pyrite and silicate minerals in bauxite reverse flotation processes.
  10. 10. The method of claim 9, wherein the multifunctional collector is used in an amount of 200g/t raw ore to 400 g/t raw ore in the bauxite reverse flotation process.

Description

Nano lignin-based multifunctional collector and preparation method and application thereof Technical Field The application relates to the technical field of mineral flotation, in particular to a nano lignin-based multifunctional collector, a preparation method and application thereof. Background In the field of mineral processing, flotation collectors are critical in determining separation efficiency. Bauxite is an important aluminum resource in China, wherein the development and utilization of high-sulfur high-silicon bauxite face the technical problem of synchronous removal of pyrite and silicate minerals. Pyrite exists mainly in the form of iron sulfide, and silicate minerals mainly include kaolinite and quartz. At present, a floatation method is generally adopted for desulfurizing and desilicating high-sulfur high-silicon bauxite. However, the former has a certain natural floatability due to the large difference in surface properties between pyrite and silicate minerals, while the latter has strong hydrophilicity, and it is difficult for a conventional collector system to produce a high-efficiency collecting effect on both. Therefore, in actual flotation operation, different types of collectors are often required to be added in sections or a combination formula of a plurality of medicaments is used, the process flow is complex, the medicament system is difficult to control, antagonism can be generated among different medicaments, and the sorting efficiency is affected. Disclosure of Invention The application provides a nano lignin-based multifunctional collector and a preparation method and application thereof, and aims to solve the technical problem that pyrite and silicate minerals are difficult to remove simultaneously in bauxite reverse flotation by the existing collector. In the first aspect, the embodiment of the application provides a nano lignin-based multifunctional collector, which is prepared from a nano lignin carrier with an average particle size of 50-200 nm through a graft copolymerization reaction and simultaneously carrying a sulfhydryl collector component and an amine collector component, wherein the mass ratio of the sulfhydryl collector component to the amine collector component is (1.5:1) - (4:1). Optionally, the sulfhydryl collector component is at least one of butyl xanthate, isobutyl xanthate, amyl xanthate, isoamyl xanthate and ethionazide, and the amine collector component is at least one of dodecyl amine, hexadecyl amine and octadecylamine. Optionally, the Zeta potential of the multifunctional collector is +20 mV to +50 mV. In a second aspect, an embodiment of the present application provides a method for preparing the multifunctional collector in the first aspect, where the method includes: And (3) carrying out graft copolymerization reaction on the mixture of the nano-grade lignin dispersion liquid, the quaternary ammonium salt surfactant, the sulfhydryl collector and the amine collector in the presence of a free radical initiator, wherein the temperature of the graft copolymerization reaction is 60-90 ℃, and the time of the graft copolymerization reaction is 12-36 hours. Optionally, the solid content of the nano-sized lignin dispersion liquid is 0.1-wt wt%, and the mass of the quaternary ammonium salt type surfactant is 0.5-5% of the mass of the nano-sized lignin dispersion liquid. Optionally, the ratio of the total mass of the sulfhydryl collector and the amine collector to the mass of the nano-sized lignin solid in the nano-sized lignin dispersion is (5-15): 1. Optionally, the mass of the free radical initiator is 10% -20% of the total mass of the sulfhydryl collector and the amine collector. Optionally, the quaternary ammonium salt surfactant is at least one of dodecyl trimethyl ammonium bromide, tetradecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide and octadecyl trimethyl ammonium bromide, and the free radical initiator is one of ammonium persulfate, potassium persulfate and azo diisobutyl amidine hydrochloride. In a third aspect, embodiments of the present application provide the use of a multifunctional collector as described in the first aspect for mineral flotation, the multifunctional collector simultaneously removing pyrite and silicate minerals in a bauxite reverse flotation process. Optionally, in the bauxite reverse flotation process, the dosage of the multifunctional collector is 200g/t raw ore to 400 g/t raw ore. Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: The embodiment of the application provides a nano lignin-based multifunctional collector which is prepared from a nano lignin carrier with an average particle size of 50-200 nm through a graft copolymerization reaction and simultaneously loading a sulfhydryl collector component and an amine collector component, wherein the mass ratio of the sulfhydryl collector component to the amine collector component i