Wet sand to achieve the main problems exist in the production of green technology

Usually a wet sand mechanism sand production line technology, raw materials after spraying water pre-wet crushing process to reduce the content of dust; sand making machine process using water washout or wet mist to suppress dust; sieving water rinse can suppress dust, and wash away mechanism Clay gravel surface adhesion; waste water containing silt extract sand Jingxi sand sedimentation tank into the three groups, the overflow of water used in the production cycle, precipitation tailings containing large amounts of argillaceous material in tailings dumps cleaned regularly library. Main problem (1) water consumption. 2011 Huzhou sand production line output of nearly 90 million t, accounting for about 75% of the wet process. In 0.7m3 / t, the total water consumption of about 47.25 million m3. Water washing back material is not economical, and control of water will not affect screening efficiency. (2) take up a lot of arable land. 2006, to reduce sand wash water and wastewater emissions selection, Huzhou all gravel mine waste water have been established three sedimentation system, the city's existing wet sand production point 50, with a total area of ​​about 320hm (excluding stope), which groups and tailings settling ponds covering about 200hm. (3) geological risks great harm. Sand production group and tailings settling ponds inventory overflow dam leakage and risk, especially during the rainy season, the impact of disasters is particularly great. Therefore, a large number of tailings sand resources can not be recovered thus affecting graded sand.