Experimental Study On Environment-friendly Molecular Modified Dust Suppressant For Mine Use

Coal dust is a major byproduct generated during coal mining production.The diffusion of coal dust not only causes severe environmental pollution,but also poses a serious threat to miners’ health.How to provide effective control over coal dust remains one of the key topics of coal mine occupational safety research.There are two main types of coal dust,one of which is in the process of well mining,and the other is in the process of coal transportation and storage.Therefore,the main research content of this paper is to synthesize the dust suppressants used in two specific environments according to the different production methods of coal dust.Environmental protection has become the mainstream trend of social development.In production,the products of environmental protection and degradation are gradually recognized and sought after by modern society.In order to achieve the purpose of environmental protection and biodegradation,a large number of substances in nature and not fully used as raw materials are selected as raw materials to modify the reaction.Finally,the raw material is sodium lignosulfonate,which is synthesized by the solution polymerization method through the grafting copolymerization technology in molecular modification technology.A kind of environment-friendly cohesive cohesive dust inhibitor used in the process of coal transportation,storage and sealing is studied and prepared.The optimum process parameters are as follows:the mass ratio of sodium lignosulfonate,acrylamide and acrylic acid is 2:7:8,the mass ratio of crosslinker and acryl amide is 1.6%,initiator and C The mass ratio of enoic acid is 2%,and the best reaction temperature is 70 C.The action mode of products on pulverized coal was observed under the condition of super depth of field and high magnification microscope,and then the mechanism of action was analyzed.The morphology and structure of the products were analyzed by IR,XRD,thermal analysis and scanning electron microscopy.The reaction was successfully carried out,and the structure of the product was good for dust.The macroscopical properties of the products are measured.The product has water absorption,and the water absorbency can be adjusted according to the environment.The product has good wind resistance and water resistance,and can effectively resist the bad environment.Under the wind speed of 8.3m/s,the mass loss rate of coal dust under the effect of cohesive cohesive dust suppressor is only 1.06%.The effect of dust suppression is obvious.An environmentally friendly wetting and condensing dust suppressant for downhole operation is developed.The single factor experimental results showed that the optimal synthesis conditions were as follows:the mass ratio of lignin to acrylamide was 2:7,the mass ratio of crosslinker and acrylamide was 3%and the optimal reaction temperature was 65℃.The coalescence of the product is observed under a high-depth-of-field microscope and the mechanism of action of the product is obtained.Wetting properties were enhanced by adding surfactants to the product,the final determined active agent dodecyl betaine,at a concentration of 0.15%.The effect of coal powder on the experiment shows that the final product is more dust-removing than the compound surfactant,and has strong adsorption ability to dust,and is less likely to cause secondary dust,and the dust suppression effect is excellent.