A former sand, sand is composed of the original body of coated sand coated sand regeneration of the original sand requirements are: high refractoriness coated sand coated sand recycling equipment company, volatile matter less coated sand regeneration equipment supply, the particles themselves high strength, generally used in natural silica sand coated sand regeneration equipment offer, mainly because of its rich reserves, cheap, to meet the casting requirements. Only the special requirements of the casting was made of special sand (such as zircon sand, chromite, ceramic sand, magnetic iron ore, etc.) as the original sand coated sand: General requirements for silica sand is: A.SiO2: cast iron and non-ferrous casting require more than 90% sand, castings require more than 98%. B. acidic than alkaline sand sand. C. clay content <0.3%. D. Particle size distribution: 3 screen should adopt centralized, 5 sieve dispersion. E. grain shape: round good choice as silica sand, angular coefficient should generally be less than 1.3. Usually by two sand scrub to meet the requirements, but in order to improve the performance of coated sand, silica sand can be pickled or active treatment temperature (900-1200 ℃ roasting). Coated sand will be seized Index 1992 amended the provisions of coated sand industry standards are: room temperature flexural strength, hot bending strength, loss on ignition, particle size, and the melting point. Optional detection indicators are: room temperature tensile strength, tensile strength hot hair volume and liquidity. Performance coated sand for nearly 10 years has been greatly improved, a corresponding increase in the detection of some new indicators: (1) high temperature compressive strength - simulate actual conditions of casting, coated sand core testing at the time of 1000-1500 ℃ compressive strength. (2) Heat time - tested coated sand core at high temperatures (700-1500 ℃) to maintain strength, no distortion, no collapsing of time. (3) anti-Shelling - The testing of anti-coated sand shelling capacity. Coated sand regeneration plant regeneration _ _ Shanghai coated sand provided by Qingdao Qingdao Heng Heng Machinery Limited. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) strong, credible, Shandong Qingdao Cleaning equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Qingdao Heng and you hand into the brilliant, for a better future!