Effect of Calcium Chloride on Low Temperature Reduction Process of Iron Oxide Charge in Blast Furnace
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摘要: 烧结矿喷洒CaCl2技术可改善烧结矿的低温还原粉化指标,但由此带入的CaCl2也会影响高炉内其它含铁原料的冶金性能。基于此,以烧结矿和球团矿为研究对象,研究了CaCl2对高炉内烧结矿和球团矿低温还原过程的影响,得到了CaCl2对两种铁矿石低温还原和失重率的影响规律。结果表明,低温下(<900℃),烧结矿经CaCl2溶液处理后低温还原粉化指标RDI+3.15均提高,失重率降低。特别是在500~700℃范围内,CaCl2对烧结矿还原过程的抑制作用明显;500~700℃内,CaCl2对球团矿低温还原过程的影响明显,继续升高温度其影响作用减弱。研究结果可为高炉生产现场选择入炉原料含氯添加剂提供理论依据。Abstract: The technology of spraying sinter with CaCl2 can improve the RDI while impacts the metallurgy performance of other raw materials in blast furnace.In order to understand the influence of CaCl2 on RDI and weight loss rate of iron ore during their low temperature reduction process,the sinter and pellet had been investigated.The results showed that RDI+3.15 of sinter after CaCl2 solution treated increased and the weight loss rate decreased at low temperature(<900℃).Especially in the temperature range of 500~700℃,CaCl2 exearted considerable inhibition effect on the reduction of sinter and obviously affected the reduction process of pellet.For the pellet the effect was weaken gradually when temperature exceeding 700℃.
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Key words:
- blast furnace /
- sinter /
- pellet /
- low temperature reduction /
- CaCl2
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