China Brown Aluminium Oxide

Brown fused alumina (A) is produced by fusion of bauxite in an electric arc furnace at high temperatures. The brownish coloured product shows high hardness as well as extreme toughness. The materials are used to grind metals of high-tensile strength such as steel, annealed malleable iron and hard bronze. It can also be used as high-class refractory.

Grain Usages and Types UsageFor vitrified wheelsFor organic wheelsFor coated abrasivesFor refractory materialsTypeAA-BA-PA-R

Physical CharacteristicsItemBasic mineralCrystal systemCrystal colorMohs
hardnessDensityBrown aluminium oxideα- Al2O3HexagonalBrown9≥3.90g/cm3ItemMicro hardnessElectrical
resistivityGrinding ability(compared with
diamond as one)Linear expansion
coefficient(when 900ºC α•10-6k-1)Brown aluminium oxideHV1800-22001014-1016Ω•cm0.107.6

Chemical CompositionGB/T 2478-2008TypeGritChemical Composition(%, by weight)Al2O3TiO2CaOSiO2Fe2O3AF4-F8095.00-97.501.70-3.40≤0.42≤1.00≤0.30F90-F15094.50-97.00F180-F22094.00-97.001.70-3.60≤0.45≤1.00≤0.30F230-F800≥93.501.70-3.80≤0.45≤1.20≤0.30F1000-F1200≥93.00≤4.00≤0.50≤1.40≤0.30A-BF4-F80≥94.001.50-3.80≤0.45≤1.20≤0.30F90-F220≥93.001.50-4.00≤0.50≤1.40≤0.30F230-F800≥92.5≤4.20≤0.60≤1.60≤0.30F1000-F1200≥92.00≤4.20≤0.60≤1.80≤0.30A-PP12-P8095.00-97.501.70-3.40≤0.42≤1.00≤0.30P100-P15094.50-97.00P180-P22094.00-97.001.70-3.60≤0.45≤1.00≤0.30P240-P800≥93.501.70-3.80≤0.45≤1.20≤0.30P1000-P1200≥93.00≤4.00≤0.50≤1.40≤0.30P1500-P2500≥92.50≤4.20≤0.55≤1.60≤0.30A-R0-1mm94.00-97.501.50-3.80≤0.45≤1.40≤0.301-3mm94.00-97.501.50-3.80≤0.45≤1.40≤0.303-5mm94.00-97.501.50-3.80≤0.45≤1.40≤0.305-8mm94.00-97.501.50-3.80≤0.45≤1.40≤0.30

Note: Special requirement on chemical composition can be satisfied through discussion.

Guarnteed bulk density range of coarse grains(A / A-B, g/cm3)GritGradeRoll CrushingBall MillBMKF121.84±0.051.92±0.052.00±0.05F141.83±0.051.91±0.051.99±0.05F161.81±0.051.90±0.051.98±0.05F201.78±0.051.87±0.051.98±0.05F221.76±0.051.85±0.051.96±0.05F241.74±0.051.84±0.051.94±0.05F301.72±0.051.81±0.051.90±0.05F361.70±0.051.79±0.051.87±0.05F401.68±0.051.76±0.051.85±0.05F461.65±0.051.75±0.051.83±0.05F541.63±0.051.73±0.051.81±0.05F601.62±0.051.72±0.051.79±0.05F701.60±0.051.69±0.051.78±0.05F801.57±0.051.65±0.051.76±0.05F901.54±0.051.64±0.051.74±0.05F1001.51±0.051.60±0.051.70±0.05F1201.49±0.051.59±0.051.68±0.05F1501.47±0.051.57±0.051.65±0.05F1801.45±0.051.56±0.051.61±0.05F2201.43±0.051.53±0.051.59±0.05

Note: Special requirement on bulk density can be satisfied through discussion.

Guarnteed bulk density range of coarse grains(A-P, g/cm3)GritGradeRoll CrushingBall MillBMKP121.80±0.051.88±0.051.96±0.05P161.78±0.051.85±0.051.94±0.05P201.76±0.051.83±0.051.93±0.05P241.73±0.051.81±0.051.92±0.05P301.70±0.051.79±0.051.90±0.05P361.68±0.051.76±0.051.88±0.05P401.65±0.051.73±0.051.86±0.05P501.62±0.051.71±0.051.83±0.05P601.59±0.051.67±0.051.81±0.05P801.57±0.051.64±0.051.77±0.05P1001.55±0.051.62±0.051.73±0.05P1201.52±0.051.59±0.051.70±0.05P1501.49±0.051.55±0.051.66±0.05P1801.47±0.051.52±0.051.62±0.05P2201.45±0.051.50±0.051.58±0.05

Note: Special requirement on bulk density can be satisfied through discussion.