Coal dust depressor and preparation method thereof

Abstract

The invention discloses a coal dust depressor which is prepared from the following raw materials in parts by weight: 1 part of modified sunflower straw, 14-32 parts of acrylic acid solution with the neutralization degree of 50-70%, 0.0048-0.0176 part of ethylene glycol dimethyl acrylate, 0.2-0.8 part of purified kieselguhr and 0.02-0.04 part of initiator. Besides, the invention also discloses a preparation method of the coal dust depressor. The purified kieselguhr containing abundant internal micropores is used as a nucleating agent, the water-soluble molecular acrylic acid is used as the polymerizable monomer, the modified sunflower straw with high cellulose content is used instead of the starch used in the traditional method for preparing the dust depressor, microwave radiation is used for accelerating the decomposition of the initiator, and the acrylic acid and cellulose are subjected to in-situ graft copolymerization on the nuclear surface formed by the kieselguhr particles to form the shell-core coated-structure copolymer, thereby preparing the coal dust depressor with favorable absorptivity, water retention property and film-forming property.

Description

technical field [0001] The invention belongs to the technical field of coal industry, and in particular relates to a coal dust suppressant and a preparation method thereof. Background technique [0002] Coal is an important basic energy in my country. The basic characteristics of China's energy resources are rich in coal, poor in oil, and low in gas. Comparing my country's coal resources with primary energy resources such as oil, natural gas, hydropower, and nuclear energy, the proven resource reserves are converted into It is standard coal, and coal accounts for more than 85%. The existing resource structure has caused the absolute proportion of coal in my country's primary energy consumption structure to reach 70%. Therefore, my country's energy production and consumption are still dominated by coal. [0003] However, as an inevitable product in the process of coal production and processing, coal dust seriously threatens the safety of coal mining, crushing and storage, incr...

AI Technical Summary

Problems solved by technology

It is not difficult to see that most of the existing dust suppressant formulas are relatively single, and the raw materials are basically concentrated in starch (although the degradation performance is good, but the product is prone to mildew and the cost is high), chloride inorganic salt (has a negative effect on the dust suppressant spraying equipment). Corrosion), synthetic water-soluble polymers (the synthesis process is complicated and difficult to control), although natural plant fibers are used to replace the synthetic water-soluble polymers in individual formulations, the preparation process still uses the simple emulsion synthesis method, synthetic After a long time, the film-forming strength of the product is generally not high

Moreover, the performance design and development of existing products mostly stay in the two aspects of water absorption and water retention, and the overall degree of functional design and development is insufficient

[0007] On the other hand, although some of the existing coal dust suppressants have good experimental results, most of them have not been popularized and applied. The main reason is that the coal dust is generated in a large amount, involving a wide range of coal types, and the research and development work is rarely fully integrated. The microscopic properties of the coal dust surface, and the lack of systematic analysis of the molecular structure of the agent, generally rely on a large number of experiments, and the blindness of research and development is obvious, resulting in prolonged product development cycles, increased costs, and unstable product performance.

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