我厂在生产中所用的型砂量较大。由于循环使用次数较多,其中的铅粉、烧结粘土及其他砂尘等得不到及时处理,致使型砂透气性下降,不适合生产要求,不得不将大部分旧砂扔掉,每年需购入600多吨新砂,增加了投资,增加了运输工具的负担。为了提高铸件质量,降低成本,我厂利用原有设备改装了一台洗砂设备,回用旧砂达70%以上。 I plant used in the production of sand larger. Due to the large number of recycling, including lead, sintered clay and other sand and dust can not be processed in time, resulting in decreased permeability of the sand, not suitable for production requirements, had to throw away most of the old sand, the annual purchase More than 600 tons of new sand increase investment and increase the burden on the means of transport. In order to improve the quality of castings, reduce costs, I plant using the original equipment converted a sand washing equipment, reuse more than 70% of the old sand.