红土镍矿还原熔炼镍铁的试验研究

EXPERIMENTAL STUDY ON FeNi-MAKING FROM LATERITE ORE IN REDUCTION SMELTING PROCESS

为提高金属回收率和镍的品位,通过对两种红土镍矿进行化学成分的测定和X射线衍射分析确定了镍矿的化学成分和矿物组成,使用两种红土镍矿按照1:1的比例进行混合,在实验室条件下进行单因素试验,考察熔炼温度、煤粉配比和渣型对红土镍矿还原熔炼的影响。综合考虑金属回收率和镍品位,确定最佳还原熔炼条件:配加5%煤粉和10%石灰石,在1550℃下熔炼50 min,在最优试验条件下,镍、铁的回收率分别为96.95%和85.15%,镍的品位达到21.89%,所得镍铁合金质量可以满足生产要求。

In order to raise the metal recovery rate and nickel grade, based on two laterite ores chemical composition determination and analysis of X-ray diffraction to determine chemical composition and mineral composition, using two types silicone magnesium laterite ore for burden rate 1：1, under the laboratory conditions for single factor test, the effects of melting temperature, pulverized coal proportion and slag pattern on laterite ore in reduction smelting process are studied. Overall considering the metal recovery and nickel grade, the optimal conditions of the reduction smelting is acquired as follows： 5% of pulverized coal and 10% of limestone, smelt 50 mins under the temperature of 1 550 ~C. Under the optimal experimental circumstances, the metal recovery of nickel and iron is 96.95% and 85.15% respectively, nickel grade is 21.89%, and the ferronickel quality can meet the production requirements.