DECARBURIZATION OF FERROCHROME AND HIGH ALLOY STEELS WITH OPTIMIZED GAS AND SLAG PHASES TOWARDS IMPROVED Cr RETENTION
DECARBURIZATION OF FERROCHROME AND HIGH ALLOY STEELS WITH OPTIMIZED GAS AND SLAG PHASES TOWARDS IMPROVED Cr RETENTION
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通过优化气相和渣相对铬铁和高合金钢进行脱碳以提高 Cr 保留率
DOI：
10.2298/jmmb120813010w
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Seetharaman
中科院分区：
文献类型：
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作者：
Haijuan Wang;M. Nzotta;L. Teng;S. Seetharaman
铬是一种高价值的金属，在高碳铬铁以及高合金钢的精炼过程中铬的保留具有显著的经济和环境影响。通常使用氩-氧混合物使脱碳过程中铬的损失最小化，从而降低氧化剂气体的氧分压（PO 2）。在本研究中，在感应炉中进行了实验，并引入CO2，以期部分还原PO 2和部分作为氧化剂。在这些实验中，使用纯O2、纯CO2或O2 + CO2混合气体对熔融铬合金进行脱碳。结果表明，CO2的引入可以使铬的损失最小化.动力学分析表明，反应过程中一个CO2分子生成2个CO气体分子，提高了熔池的搅拌能力，是一种有效的传质过程。另外，CO2与熔体中的碳反应是吸热反应，在精炼过程中引入CO2可以起到冷却剂的作用，因此可以通过控制稀释气体的量来控制温度，这样可以防止熔池耐火材料过热，延长耐火材料的使用寿命。
Chromium is a high value metal and the retention of the same during the refining of high carbon ferrochrome as well as high alloy steel has significant economic and environmental impacts. The loss of chromium during the decarburization is generally minimized using argon-oxygen mixtures thereby reducing the oxygen partial pressure (P O2 ) of the oxidant gas. In the current study, experiments were carried out in an induction furnace and CO 2 was introduced with the view to partly reduce P O2 and partly as an oxidizer. During these experiments, the decarburization of molten Cr-alloy was conducted using pure O 2 , pure CO 2 or O 2 +CO 2 mixtures. The results demonstrated that the Cr loss can be minimized under CO 2 introduction. The kinetic analysis showed that the mass transfer is effective due to the production of 2CO gas molecules from one CO 2 molecule during the reaction which will improve the stirring of the bath. Besides, CO 2 reacts with carbon in melt is an endothermic reaction, introduction of CO 2 could be a cooler during the refining process, hence the temperature could be controlled by controlling the diluting gas amount, in this case, the over heat of bath refractory could be prevented and the lifetime of refractory could be extended.