Binary surface-to-surface adsorption type dispersing agent for slurry forming of low-rank coal and preparation method of dispersing agent

Abstract

The invention discloses a binary surface-to-surface adsorption type dispersing agent for slurry forming of low-rank coal and preparation method of the dispersing agent, belonging to the field of dispersing agent. The preparation method comprises the steps that firstly, graphite is oxidized to obtain graphite oxide; then a carboxyl group on the edge of the graphite oxide is sequentially subjected to acylating chlorination and esterification; and then hydrophilic chains are grafted through an emulsion polymerization method so as to obtain the surface-to-surface adsorption type dispersing agent for slurry forming of low-rank coal. The dispersing agent has a central hydrophobic anchoring group similar to the surface structures of non-caking coal, sub-bituminous coal and lignite, so the dispersing agent can realize surface-to-surface adsorption with the surfaces of the non-caking coal, the sub-bituminous coal and the lignite through pi-pi effect, a hydrogen bond and a hydrophobic effect, and adsorption acting force and an adsorption area are relatively large. A hydrophilic chain is introduced into the structure of the dispersing agent, so the dispersing agent can effectively improve the interface structure of coal and water, reduce the polarity interaction energy of the interface, enhance the electrostatic repulsion and steric hindrance among coal particles and inhibit coal aggregation and moisture adsorption, thereby improving the slurrying performance of low-rank coal.

Description

technical field

[0001] The invention belongs to the field of dispersants, and relates to a binary surface-adsorption type dispersant for low-rank coal slurrying and a preparation method thereof. Background technique

[0002] Non-caking coal, sub-bituminous coal and lignite are coals with a low degree of metamorphism that have been oxidized in the early stage of coal formation. Because of their high water content and high oxygen content, they have the characteristics of low calorific value and are mainly used for gasification and power generation. Coal can also be used as power and civil fuel. Because of its high efficiency and environmental protection, coal water slurry is considered to be one of the important ways to realize the efficient and clean utilization of coal in my country. Coal water slurry technology is also the main means of coal gasification at present. The preparation of high-quality coal-water slurry from non-caking coal, sub-bituminous coal and lignite has ...

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