Abstract Molten reduction to release the value metals are the necessary step in the copper slag recovery process. How to effectively choose and utilize the reducing agents has an extremely important significance. In the research, molten reductions with the CO-H2-Ar mixed gases are investigated. De-oxidation amounts and de-oxidation rates maintain stability first and then decrease with the increase of CO/H2 ratios. They are all much higher than those of pure CO or H2 due to the water-gas shift reaction. The magnetite phase decreased gradually with the decrease of CO/H2 ratios, and some pure ferrous phase can generate in the slag as the ratios are less than 1:1. Otherwise, the apparent rate constants, the reaction orders and the activation energies for the various CO/H2 ratios are also measured. The results illustrate that the reaction process will vary with the variety of mixed gas compositions.

中文翻译：

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CO-H2混合气利用效率提升与铜熔渣还原改性相关

摘要 熔融还原释放有价金属是铜渣回收过程中必不可少的步骤。如何有效地选择和利用还原剂具有极其重要的意义。在研究中，研究了 CO-H2-Ar 混合气体的熔融还原。脱氧量和脱氧速率随着CO/H2比的增加先保持稳定后下降。由于水煤气变换反应，它们都比纯 CO 或 H2 高得多。随着CO/H2 比值的降低，磁铁矿相逐渐减少，当CO/H2 比值小于1:1 时，渣中会生成一些纯亚铁相。此外，还测量了各种 CO/H2 比率的表观速率常数、反应级数和活化能。