(1. 中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083；2. 中冶華天工程技術(shù)有限公司 燒結(jié)部，南京 210019)
摘 要: 通過含碳鉻鐵礦粉礦成球及還原實驗，研究還原溫度、內(nèi)配碳量、還原時間和添加劑對鉻鐵礦球團(tuán)預(yù)還原結(jié)果的影響。結(jié)果表明：還原溫度和內(nèi)配碳量對預(yù)還原球團(tuán)的金屬化指標(biāo)影響非常明顯，溫度高于1 200 ℃時，鉻鐵礦預(yù)還原球團(tuán)的金屬化指標(biāo)開始明顯增加，內(nèi)配碳比IC/O=1.2為鉻鐵礦預(yù)還原球團(tuán)的較佳配比；高溫(≥1 300 ℃)時，可實現(xiàn)含碳鉻鐵礦球團(tuán)的快速還原(t ≤1 h)；低溫時，鐵優(yōu)先于鉻還原，總還原反應(yīng)完成時間需3~4 h。添加劑強(qiáng)化含碳鉻鐵礦球團(tuán)預(yù)還原的實驗結(jié)果表明，不同添加劑對還原反應(yīng)的影響具有較大差異；不同溫度下，相同添加劑的催化能力也有一定的差異；實驗所涉及的添加劑中以NaCl、Na2B4O7·10H2O和Na2CO3的催化效果較好。
關(guān)鍵字: 鉻鐵礦；球團(tuán)；固態(tài)還原；金屬化率
（1. School of Resources Processing and Bio-engineering, Central South University, Changsha 410083, China;
2. Sintering Department, Huatian Engineering and Technology Corporation, MCC, Nanjing 210019, China）
Abstract:The balling and reducing experiments of carbon-bearing chromite fines were carried out in laboratory. The effects of reduction temperature, amount of carbon, reduction time and types of additives on the metallization of carbon-bearing chromite pellets were investigated. The results show that the reductivity of carbon-bearing chromite pellet is greatly influenced by the reduction temperature and C/O mole ratio. At the temperature above 1 200 ℃, the metallization of prereduction pellet begins to increase obviously, and IC/O=1.2 is better for the prereduction of chromite pellet. The fast reduction of carbon-bearing chromite pellet can be achieved at high temperature (≥1 300 ℃); but it needs 3−4 h to finish the reduction reaction at low temperature, and the reduction reaction of iron is easier than that of chromium. The intensifying reduction of carbon-bearing chromite pellet with the help of additives was studied. The results indicate that different additives have great difference in the influence of reduction reaction, and the catalytic property of the same additive also has some difference at different reduction temperatures. For all involved additives in the experiment, NaCl, Na2B4O7·10H2O and Na2CO3 have excellent catalytic performance.
Key words: chromite; pellet; solid-state reduction; metallization
