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以硅镁型红土镍矿为原料,采用金属化焙烧-熔分工艺,通过正交试验制备金属化球团,将所得金属化球团在1500℃条件下熔融分离30min提取镍铁合金,考察影响因素对实验结果的影响.结果表明:在选择性还原制备金属化球团过程中,对金属化率的影响程度从大到小的因素依次是C/O摩尔比、焙烧温度、焙烧时间和碱度;实验可获得镍品位19%的镍铁合金;在碱度为0.8~1.2范围内,S和P分配比随着碱度的升高而增大.利用X射线衍射和扫描电镜对金属化球团及熔融分离出的渣进行微观分析,发现加入的石灰石与复杂矿相反应可释放出简单镍氧化物和铁氧化物,促进还原反应的进行,当石灰石不足时,少量铁以Fe3+的形式存在于铁金属化率70%的金属化球团中.
The nickel-iron alloy was obtained by melting and separating the metallized pellets for 30min at 1500 ℃ with the metallurgical roasting-melting process by using the magneto-silicate laterite nickel ore as the raw material. The influence of the factors On the experimental results.The results show that in the process of selective reduction of metallized pellets, the factors that affect the metallization rate from large to small are C / O molar ratio, calcination temperature, calcination time and alkalinity ; Nickel-iron alloy with 19% nickel grade was obtained experimentally, and the distribution ratio of S and P increased with the increase of alkalinity in the range of basicity of 0.8 ~ 1.2. X-ray diffraction and scanning electron microscopy And the melt separation of the slag microscopic analysis found that the addition of limestone and complex ore phase reaction can release simple nickel oxide and iron oxide to promote the reduction reaction, when limestone is not enough, a small amount of iron in the form of Fe3 + Iron metallization rate of 70% of the metal pellets.