Characteristics Investigation of Low Temperature Pulverization of Pheretima

Objective: To investigate process parameters and powder characteristics of Pheretima after low temperature pulverization. Method: Pheretima was crushed again by vibration type low temperature ultrafine pulverizer after it was crushed to uniform particle size with high speed grinderof Chinese medicine,sampling every 3 min until all samples out of machine by 25 min,then particle size,specific surface area and porosity of samples were tested. Result: With increasing of grinding time,particle size decreased gradually,then particle size increased after agglomeration of particles; specific surface area and porosity increased firstly and then decreased. Adsorption-desorption curve showed that relative pressure concentrated in 0. 8-1. 0 when condensation and evaporation occurred; Adsorption quantity of N 2 in sample was maximum after crushed 9 min,and it had significant differences with other samples. Conclusion: Pheretima could be crushed to micron level by vibration type low temperaturepulverization,low temperature pulverizationcould guarantee active ingredients in Pheretima unchanged,and it was not easy to gather after crushed to appropriate particle size,which reached particle design requirements of Pheretima in Xiaojin pills.