Abstract：High carbon ferro-chrome was melted with KOH and KNO3 in a nickel crucible. The melting temperature was selected at 600 ℃ and the melting time at 10 min so that the damage to nickel crucible was reduced for the convenience of leaching. A self-designed filtration device was made by refitting an ordinary filtration bottle through replacing glass-cored funnel with plastic materials, and only 1/4 filter paper (φ=40 mm) was needed. By this method, the filtration was rapid, the filtration paper remained complete, and the residual acid amount was small, which was easy to wash and neutralize, as a result, the detection time was greatly reduced. The proposed method has been applied to the determination of high carbon ferro-chrome, the result of which agreed well with the national standard-perchloric acid dehydration gravimetric method. The relative standard deviation was smaller than 5 %.
