Henan Bao Chu sand

◆ Features ○ Baozhu sand thermal expansion coefficient is small, performance can be comparable with the zircon sand, no formulated with sand, casting sand expansion defects ○ spherical, good liquidity, Chung Yi real, and good permeability ○ surface smooth, compact structure, so that the adhesive can be uniformly covered with a neutral material ○ Baozhu sand, acid and alkali adhesive can be used ○ recycled back to good performance, cost-effective compared with the chromite sand, zircon sand, its price Only 30-50% zircon sand, chromite sand. At the same time, because sand is spherical, the surface area is small, so the added amount of the resin can be reduced 30-50%, the amount of added water glass ≤4%; and reduce casting defects resulting binder, to improve the yield of castings . ○ high refractoriness, easily collapsing sand Baozhu mullite phase is much higher than the sintered product, has good fire resistance. ○ thermal conductivity, good stability, no cracks ○ wide range of applications water glass sand, resin sand, Cleanup precision casting and polishing copper, aluminum parts. ◆ Wide range of applications suitable for LFC, shoe membrane sand, water glass sand, resin sand, casting and copper, aluminum polishing cleaning. ◆ main indicators Sarah sand No. Name Index Name Index No. 7 a spherical shape coefficient of expansion (20-1000 ℃) 6 × 10-6 / ℃ 2 dark brown color 8 size 6-320 mesh (φ0.053-3.36mm) 3 refractory temperature ≥1820 ℃ 9 Al2O3 70-85% 4 bulk specific gravity of 1.95-2.05g / cm3 10 SiO2 ≤15% 5 true density of 2.9g / cm3 11 TiO2 ≤1.5% 6 thermal conductivity (1200 ℃) 5.27W / M · K 12 PH value 7-8 ◆ Baozhu sand calcination process 1. 2. 3. fused sub-screen ◆ granulated 4. Sarah and zircon sand, chromite sand, silica sand of main numerical comparison: Name of Sarah sand Zircon sand chromite sand ZrSiO4 PH value 7.65 4.56 8.24 heap density (g / cm 3) 1.95-2.05 2.9-3.1 2.6-2.7 true density (g / cm 3) 2.9 4.4-4.71 3.9-4.8 irregular spherical particle shape the amount of binder added irregular (water glass hardened + CO2) 3-4% 7-8% 7-8%