Coated sand coated sand production method, mixed anatomy experienced dry mix, cold coating method, temperature coating, thermal coating method four stages, the current production of coated sand almost all thermal laminating method. Thermal coating process is the first raw sand heated to a certain temperature, and the resin respectively, Wuluo removal of aqueous solution and calcium stearate were mixed and stirred, cooled from crushing and screening. Due to differences in the formulation of Qingdao coated sand regeneration, blending process is different. At present, domestic species, many coated sand production line, hand-feeding of semi-automatic production lines, about 2000 to 2300, the computer-controlled automatic production line also has nearly 50 coated sand reclamation plant, improve production efficiency and product stability. Phenolic resin sand regeneration is based on the principle of regeneration of waste sand at high temperatures, enabling crystal-shaped silicon oxide silica sand - the structural variants in the same quartz crystal transformation from α β crystal form, reducing the thermal expansion coefficient of silica sand. Coated sand reclaimed sand used for regeneration, can reduce the deformation of the casting, burrs and other defects. When the waste sand reclamation, sand the surface of the resin film also makes burning and silica impurities such as metal oxides stripped improve sand silicon-oxygen bond activity. When can improve regeneration instead of the original sand coated sand coated sand production, increased sand strength to prevent sticky sand casting and porosity. High temperature coated sand: The sand coated sand generally refers to thermal intensity, long time resistant, high temperature deformation, rather than its high refractoriness. It is through a special process recipe technology (usually when a certain amount of inert materials such as silica sand coated sand milling, high chromium ore, carbonaceous material or other inert materials, etc.), to produce a superior high temperature performance and integrated casting The new coated sand properties. High temperature, high strength, low inflation, low gas, gas, etc. slow hair. Especially for complex thin-walled precision iron castings (such as automobile engine block, cylinder head, etc.) as well as the high demand of castings (such as container train horn and brakes buffer housing, etc.) production, which can effectively eliminate the sticky sand, deformation, thermal cracking and porosity and other renewable coated sand casting defects _ Qingdao Qingdao Heng (certified) _ coated sand regeneration provided by Heng Machinery Co., Ltd. Qingdao. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) is Qingdao, cleaning, cleaning equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Qingdao Heng led the staff warmly welcome all inquiries negotiations to create a better future Qingdao Heng.