Nano-particle collecting agent for low-rank coal floatation and preparation method

Abstract

The invention discloses a nano-particle collecting agent for low-rank coal floatation and a preparation method. The nano-particle collecting agent is monodisperse polymer nano micro-spheres with tetrahydrofuran on the surfaces. The preparation method includes the steps that styrene, functional monomers T, a cross-linking agent and ultrapure water are added into a reaction device, nitrogen is introduced, the materials are stirred and mixed for 30 min at the rotating speed of 350 r / min, and then the temperature is raised to 70 DEG C; an initiator is added, stirring continues to be carried out at the rotating speed of 350 r / min, and the materials continue to react for 6 h under nitrogen protection; nano-emulsion obtained after the reaction is added into ultrapure water to be dispersed and then centrifugally purified, and the nano-particle collecting agent is prepared. The nano-particle collecting agent and oxygen-containing functional groups on the surface of low-rank coal can generate selective adsorption, a nano-scale rough surface is formed on the surface of the low-rank coal, the surface hydrophobicity of the low-rank coal is enhanced, and floatation indexes are increased. The preparation method of the nano-particle collecting agent has the advantages of being simple in process, easy and convenient to operate, easy to control and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral flotation, and relates to a method for preparing a collector, in particular to a nanoparticle collector for low-rank coal flotation and a preparation method. Background technique [0002] Low-rank coal refers to lignite, long-flame coal, non-caking coal, weakly caking coal, and some gas coals with a low degree of metamorphism. my country is rich in low-rank coal resources, accounting for more than 50% of coal resource reserves. Low-rank coal produces a large amount of slime during the mining and sorting process, and flotation is one of the most widely used and efficient coal preparation methods for sorting fine-grained slime. However, low-rank coal has a low degree of metamorphism, many oxygen-containing functional groups on the particle surface, poor natural buoyancy and developed pores, resulting in high reagent consumption and low efficiency during flotation separation. Therefore, it is imminen...

AI Technical Summary

Problems solved by technology

However, these two types of nanoparticles are only polymer nanoparticles with positive and negative charges on the surface, not functionalized nanoparticles designed for the surface properties of low-rank coal. The surface has characteristic groups that can combine with oxygen-containing functional groups on the surface of low-rank coal. Functionalized nanoparticle collectors have not yet been reported

Images