Model Number: 0-1 1-3 3-5 5-8 200# 320#-#3785 Brand Name: Baiyun Key Specifications/Special Features: Bauxite (aluminous soil; bauxite) is also called the alumina or bauxite, main ingredients are alumina, hydrated alumina containing impurities, is an earthy mineral. White or gray, brown and yellow or light red by iron.From 4 to 3.9g/cm density, hardness, 1 - 3 is not transparent, very brittle. Very difficult to melt.Insoluble in water, soluble in sulfuric acid, sodium hydroxide solution. Mainly used for aluminium, refractory material. GradeAL2O3FE2O3TI02 K2O+Na20 CaO+MgO Bulk density 75 75min ≤3.0 ≤4.0 ≤0.3 ≤0.5 ≥2.70 80 80min ≤3.0 ≤4.0 ≤0.3 ≤0.5 ≥2.80 85 85min ≤2 ≤4.0 ≤0.3 ≤0.5 ≥3.00 86 86min ≤2 ≤4.0 ≤0.3 ≤0.5 ≥3.10 87 87min ≤2 ≤4.0 ≤0.3 ≤0.5 ≥3.20 88 88min ≤1.8 ≤4.0 ≤0.25 ≤0.5 ≥3.25 90 90min ≤1.8 ≤4.0 ≤0.25 ≤0.5