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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >The preparation of chromiummetal by a sealed, cold-hearth, plasma-assisted aluminothermic method
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The preparation of chromiummetal by a sealed, cold-hearth, plasma-assisted aluminothermic method

机译：通过密封，冷壁炉，等离子体辅助的铝制方法制备富铬化合物

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The efficiency and cost-effectiveness of the akminothermic reduction process in the production of ferro-alloys and 'pure' metals depends strongly on appropriate balancing of the process energy required. Insufficient energy results in a poor metal yield, while over-supply can result in excessive fuming and possibly even ejection of the reactor contents in a potentially dangerous 'thermite bomb' reaction. This situation becomes even more critical when the suitability of limited quantities of oxide from new sources must be evaluated, dictating smaller-scale testwork. The resulting higher relative heat losses from the system complicates control of tie energy balance, and usually requires the addition of thermal boosters or reactant preheating in order to sustain an autothermie process. This often detracts from the quality of the metal product, and adds to the hazards of batch aluminothermic-reduction testing. The development of a small-scale method (producing less than 2,5 kg of metal) for the plasma-assisted aluminothermic redaction of chromium oxide that overcomes such difficulties is described. The technique involves the use of a sealed 50 kVA plasma-arc furnace to provide controlled electrical ignition and supplementary energy to the reactants contained in a water-cooled copper crucible. The application of the method to the evaluation of the aluminothermic production of pure chromium metal from a unique chromic oxide source is reported.
机译：在生产铁合金和“纯”金属中的Akminothey降低过程的效率和成本效益在所需的工艺能量的适当平衡上强烈依赖于适当的平衡。能量不足导致金属产量不佳，而过度供应可能导致过度发出的熏蒸，并且可能在潜在危险的“热轧炸弹”反应中甚至突出反应器内容物。当必须评估有限量的氧化物从新来源的适用性时，这种情况变得更加重要，要求较小的验证。由此产生的较高的相对热损失使得延伸能量平衡的控制使得控制能量平衡使热助剂或反应物预热的控制变得复杂化，以便维持自动液处理。这通常会减损金属产品的质量，并增加了批量铝热还原测试的危害。描述了用于等离子体辅助氧化铬的等离子体辅助氧化氧化铬的小规模方法（产生小于2,5千克金属）。该技术涉及使用密封的50kVA等离子体炉，以向包含在水冷坩埚中包含的反应物提供控制的电气点火和补充能量。据报道了该方法在纯氧化物源纯铬金属的评价中的应用。

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