Brown coal reverse-flotation medicament combination use method

Abstract

A brown coal reverse-flotation medicament combination use method belongs to a fine particle coal separate method. The method comprises the following steps of: mixing brown coal which is finely ground so that the monomer granularity achieves basic dissociation into ore slurry with preference concentration; firstly adding soluble salt (sodium chloride) to stir; adding an inhibiting agent (causticizing corn starch) to stir; then adding a collecting agent (dodecyl amine-hydrochloride) to stir; and finally adding a foaming agent (methyl isobutyl carbinol) to stir; and the brown coal reverse-flotation medicament combination use method is characterized in that the soluble salt is added in the brown coal reverse-flotation, and four medicaments are combined for use. The brown coal reverse-flotation medicament combination use method has the advantages that the conventional floating agent is used, and the flotation of thin brown coal granules without modification is realized by using a reverse-flotation method through the combination of medicaments, namely, mineral granules with high ash float out from foams as a goal object; and simultaneously, according to the method, the flotation rate of mineral is increased, the separating effect is improved, the sedimentation rate of ore slurry is quickened, and the sedimentation of separated ore slurry is facilitated. Compared with the direct flotation, the stronger the hydrophilicity of the surface of brown coal is, the better the reverse-flotation effect is; and therefore, the disadvantages are changed into the advantages.

Description

technical field

[0001] The invention relates to a fine-grained coal separation method, in particular to a method for combining lignite reverse flotation reagents. Background technique

[0002] As a kind of low-quality coal, lignite is easy to weather when exposed to air and muddy when exposed to water due to its high water content and high ash content. It has not yet been developed on a large scale like high-rank coal. However, with the dwindling of high-quality coal resources, lignite with abundant reserves will surely become one of the main energy sources in my country in the future. Flotation, as an important separation method for fine-grained minerals, can effectively reduce the ash content in coal slime. However, due to the poor floatability of lignite, it has not been applied to lignite separation so far.

[0003] Conventional coal slime flotation mainly uses the difference in hydrophobicity between coal and gangue surface, uses kerosene or diesel oil as collector, pi...