Polar mixed reagent for low-rank coal flotation and flotation process

Abstract

A polar mixed reagent for low-rank coal flotation and a flotation process are suitable for the technical field of low-rank coal mining. The polar mixed reagent is prepared from the following raw materials in parts by mass: 30-44 parts of short-chain ester, 30-44 parts of n-caprylic acid, 3 parts of sec-octyl alcohol, 7 parts of fatty acid polyoxyethylene ether, 5 parts of Tween 40, 4 parts of span80 and 7 parts of CuSO4. During use, the reagent is fully and uniformly mixed in an aqueous solution in advance by using a stirring barrel and ultrasonic waves emitted by an ultrasonic plate. The reagent consumption is low, the flotation recovery rate is increased, different types of reagent molecules are fully dispersed into an ore pulp solution, the size of collecting agent oil drops is reduced, the reagent can be more efficiently and effectively spread on the surfaces of coal particles, the action efficiency of the reagent is greatly improved, the recovery rate of clean coal is increased,and pollution to the coal-series environment is reduced.

Description

technical field [0001] The invention relates to a polar mixed agent for flotation of low-rank coal and a flotation process, and is especially suitable for a polar mixed agent for flotation of low-rank coal and a flotation process used in coal enterprises. Background technique [0002] The reserves of low-rank coal, including lignite and long-flame coal, account for more than 50% of the total coal reserves; low-rank coal has low mining cost and easy access, and has become an important energy supply and chemical production raw material. However, low-rank coal itself has the characteristics of low calorific value and high ash content, which restrict the large-scale industrial application of low-rank coal and cause serious waste of resources. Therefore, in order to improve the utilization efficiency of low-rank coal resources and the technical concept of green production, it is necessary to classify and sort low-rank coal before industrial use, so as to achieve the purpose of re...

AI Technical Summary

Problems solved by technology

However, due to the low degree of metamorphism of low-rank coal, the surface contains a large number of oxygen-containing functional groups, such as carboxyl, hydroxyl and methoxyl groups, etc., resulting in a large amount of water molecules adsorbed on the coal surface to contain oxygen during the flotation and pulping process of low-rank coal. A hydration film is formed on the group, which seriously hinders the adsorption and spreading of oil collector molecules on the surface of low-rank coal

At the same time, due to the high viscosity of the oil collector molecules, they are easy to self-polymerize in the water environment, which also limits their adsorption on the coal surface.

The poor adsorption effect of oil collector molecules on the surface of low-rank coal has become the main factor affecting the flotation improvement of low-rank coal

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