由于造型、制芯工艺的飞速发展,各种有机、无机粘结剂的型(芯)砂在循环使用中灰粉增加,砂粒度分布变化复杂,砂粒的附着粘结剂一惰性膜、有害杂质以及砂温变化,致使型、芯砂工艺性能降低,导致铸件废品率的增加。因此,为了改善和控制循环使用的旧砂,保证铸件质量就必须进行旧砂再生的工艺处理;通过这一工艺过程,使旧砂性能恢复或接近新砂的性能。然而企图要求去除更多的惰性膜,必然要引起砂粒的过份破碎和细化。为此 Due to the rapid development of molding and core-making process, various types of organic and inorganic binder-type (core) sand are used in recycling, the ash content increases, the distribution of sand grain size changes in a complicated manner, and the sand binder adheres to an inert film, As well as changes in sand temperature, resulting in type, core sand process performance decreases, leading to increased casting reject rate. Therefore, in order to improve and control the recycling of used sand, to ensure the quality of the castings must be the old sand regeneration process; through this process, so that the old sand performance recovery or close to the new sand performance. However, an attempt to remove more inert film is bound to cause excessive crushing and refining of the grit. to this end