Abstract: In order to effectively solve the problem of dust suppressants losing their active components due to erosion by atmospheric precipitation during outdoor use and having a short dust suppression duration,a study approach based on porous materials for the sustained release of dust suppressant components was proposed. Performance evaluation criteria were established for the adsorption rate and release rate of the dust suppressant components,and corresponding indoor standard testing methods were designed. Nylon filter cloth was used to wrap 20 g of porous material with a particle size of 30 ~ 40 mesh. After complete immersion in a 0. 5% concentration solution of polyacrylamide ( PAM) for 90 minutes,the material was dried. The percentage of the mass of adsorbed solute in the porous material to the total mass of the solute was determined as the adsorption rate. The release rate was determined by completely immersing the adsorbed solute porous material in pure water for 10 minutes,followed by drying,and calculating the ratio of the mass of the solute dissolved in the water to the total mass of the adsorbed solute. The application test was carried out by using activated carbon. The results showed that the dust suppressant components based on porous materials exhibited adsorption and sustained release capabilities. The selected criteria for adsorption rate,release rate,and their testing methods were reasonable and feasible. The standardized test procedure constructed demonstrated good operability. The test results also indicated that activated carbon has good adsorption and sustained release performance of dust suppressant.

Key words: dust suppressant,adsorption performance,sustained release performance,porous material,activated carbon