Smelting Reduction Rate of Chromite Ore

铬铁矿冶炼还原率

• 批准号: 60550470
• 负责人: AMATATSU Masayoshi
• 金额: $ 0.26万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550470/
• 关键词: Dissolution rate; Reduction rate; Smelting reduction; Chromite ore; 転炉型反応器

In this study, the smelting reduction rate of chromite ore was measured in graphite crucible. The determining rate of smelting reduction for pure chromium oxide was obtained as the supply of sample and/or the reduction degree held on approximately 100% charged continuously onto iron melts.Two kinds of chromite ore, south african ore and philippine ore, were used for the experiments to be increasing up to the rate of pure chromium oxide. The chromite ore was scarcely dissolved into iron melt at 1600゜C, and its rate was nearly 1/50 as compared with pure chromium oxide.The addition of iron ore powder or lower melting fluxes into chromite ore pellet had no effect on the smelting reduction.The smelting reduction rate of chromite ore was accelerated by dissolving the chromite ore in the molten slag. The smelting reduction was determined by the chemical reduction on the slag-metal boundary layer and it was independent on slag basicity.The apparent activation energy of smelting reduction for chromite ore dissolved and reacted in the boundary molten slag and metal obtained as 57.4 kcal/mol.

在石墨坩埚中测定了铬铁矿的熔炼还原率。纯氧化铬的熔炼还原率的确定是在样品的供应和/或在铁熔体上连续充电约100%时保持的还原度。采用南非矿和菲律宾矿两种铬铁矿进行试验，以提高氧化铬的纯度。在1600℃时，铬铁矿几乎不溶于铁水中，与纯氧化铬相比，其溶解率接近1/50。在铬铁矿球团中加入铁矿粉或较低熔点对冶炼还原没有影响。将铬铁矿溶解在熔渣中，可以加快铬铁矿的冶炼还原速度。熔炼还原是由渣-金属边界层的化学还原决定的，与矿渣碱度无关。在熔渣与金属边界熔液中溶解反应的铬铁矿熔炼还原表观活化能为57.4 kcal/mol。