CAJ | 학술논문

由于硫化镍矿生产镍铁在经济和环境上不断出现的问题,采用红土镍矿生产镍铁越来越受到重视.但是红土镍矿制备镍铁的火法工艺中,在提高铁镍产品中的镍含量方面的理论研究仍存在许多不足.出于这方面的考虑,假设Fe2O3、FeO和Fe3O4的活度为1,计算了CO2/CO、H2O/H2和CO2/H2三种气氛下选择性还原红土镍矿时,不同铁活度下铁?铁氧化物的平衡条件.从已有的热力学数据出发,利用Miedema二元合金生成热模型,计算了Ni?Fe固态二元合金中铁的活度系数.并以活度系数为纽带,最终计算出这三种还原气氛下,镍铁合金产物中的铁含量与还原气体分压、还原温度的关系.并用 CO2/H2还原红土镍矿,得到的实验数据与理论值进行了对比分析与讨论,热力学计算结果很好地解释了选择性还原红土镍矿时铁金属化无法避免的原因,并较好地预测了红土镍矿还原产物中铁含量随温度和气体组分的变化趋势.
유우류화얼광생산얼철재경제화배경상불단출현적문제,채용홍토얼광생산얼철월래월수도중시.단시홍토얼광제비얼철적화법공예중,재제고철얼산품중적얼함량방면적이론연구잉존재허다불족.출우저방면적고필,가설Fe2O3、FeO화Fe3O4적활도위1,계산료CO2/CO、H2O/H2화CO2/H2삼충기분하선택성환원홍토얼광시,불동철활도하철?철양화물적평형조건.종이유적열역학수거출발,이용Miedema이원합금생성열모형,계산료Ni?Fe고태이원합금중철적활도계수.병이활도계수위뉴대,최종계산출저삼충환원기분하,얼철합금산물중적철함량여환원기체분압、환원온도적관계.병용 CO2/H2환원홍토얼광,득도적실험수거여이론치진행료대비분석여토론,열역학계산결과흔호지해석료선택성환원홍토얼광시철금속화무법피면적원인,병교호지예측료홍토얼광환원산물중철함량수온도화기체조분적변화추세.
As the sulfide ore deposits become less economical and environmental viable as a source of nickel, increasing attention is being paid to the laterite ores. But in the pyrometallurgical process of laterite, more efforts should be paid to control the reduction of iron oxide in order to get high nickel-content nickeliferous product. For these reasons, equilibrium condition of iron oxide when laterite ore was selectively reduced by CO2/CO, H2O/H2 and CO2/H2 was studied from the perspective of iron activity with an assumption that the activities of FeO and Fe3O4 equal 1 in this work, and it well accounts for the inescapability of Fe metallization. Activity coefficient of iron in Ni?Fe binary solid alloy was calculated by Miedema model based on the known thermodynamics datum filed. According to Raoult's law, the relationship among the Fe/Ni ratio, reduction temperature and reduction gas composition was calculated when laterite ore was selectively reduced by the three different reduction systems. The calculation result was discussed and also compared with the experimental result. The trend of metal iron content in the reduction product of laterite ore varying with temperature and gas composition was well predicted by the calculation result.