40-70目铬矿砂 46%南非进口铬矿砂价格好质量高 化学指标: Cr2O3≥46.0% FeO≤26.5% Al2O3≤15.5% SiO≤1.0% MgO≤10.0% CaO≤0.30% Cr/Fe:1.55:1 物理指标: Appearance:Black Melting poin:2150°C pH:7-9 The amount of the acid≤ 2 ML Percent soil<0.1 Percent Moisture≤0.1 The sintered:1600 Percentage of free acid present in the sand: 0