含镍、铬复合氧化球团的制备工艺

 利用廉价的低品位铬铁矿精矿以及红土镍矿制备含镍、铬复合球团,用于高炉生产含镍和铬不锈钢母液,对于保障不锈钢产业的可持续发展具有重要意义。系统研究含镍、铬球团制备工艺,探究红土镍矿配比、铬铁矿配比以及添加剂对球团强度的影响。结果表明,当混合料配比为45%红土镍矿+15%铬铁矿+40%铁精矿时,添加7.7%添加剂的混合料经高压辊磨预处理后可制备出合格生球,在预热1 000 ℃+12 min,焙烧(1 220～1 250 ℃)+12 min的条件下可获得抗压强度大于2 500N/个的成品球团,可用于高炉生产铁、镍和铬三元不锈钢母液。

Process of pelletization of nickel laterite and chromite

The use of cheap low grade chromite concentrate and laterite nickel ore to prepare composite pellets containing nickel and chromium for the production of nickel and chromium stainless steel master alloys in blast furnace is of great significance for the sustainable development of China's stainless steel industry. The preparation process of nickel-containing and chrome-containing pellets was systematically studied, and the effects of adding nickel laterite,chromite,and additive were carried out. The results show that, the compressive strength of fired nickel laterite pellet can reach over 2 500 N/pellet while preheating at 1 000 ℃ for 12 min and firing at 1 220-1 250 ℃ for 12 min. The mixture contained 45% of nickel laterite, 15% of chromite and 40% of iron ore, by adding with 7.7% of additive and pretreated by high-pressure roller grinding. The product pellet can be used as a high-quality burden for blast furnace to manufacture Fe-Cr-Ni alloys.