Influence mechanism of different types of coal on selective nickle reduction in nickel laterite reduction roasting
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摘要: 以某含鎳1.86%(質量分數)、鐵13.24%(質量分數)的紅土鎳礦為對象,分別采用石煤和無煙煤作為還原劑,考察了煤種對紅土鎳礦中鎳的選擇性還原的影響.結果表明,用石煤作為還原劑能夠達到鎳選擇性還原的目的.X射線衍射及掃描電鏡分析研究表明,還原過程中鎳、鐵先以鎳紋石形式存在,隨著煤用量增加,逐漸變為以鐵紋石形式存在.同時隨著煤用量的增加,焙燒后生成的含鎳鐵礦物中鎳的比例逐漸遞減,而鐵的比例逐漸遞增.石煤為還原劑時焙燒產物中主要以鎳紋石的形式存在,同時金屬鐵的生成量比無煙煤作還原劑時低,因此采用石煤作還原劑比無煙煤作還原劑對鎳還原具有更強的選擇性,可以得到更高鎳品位的鎳鐵精礦.Abstract: With a nickel laterite of 1.86% Ni and 13.24% Fe as a sample,the influence of different types of coal on selective nickel reduction in nickel laterite reduction roasting was studied with stone coal or anthracite as a reductant.It is indicated that nickel can be selectively reduced with stone coal as a reductant.The results obtained by X-ray diffraction(XRD) and scanning electron microscopy(SEM) show that taenite is the main form of nickel and iron in the roasted products when the dosage of coal is small,but the main mineral form changes into kamacite with the dosage of coal increasing.At the same time,with the dosage of coal increasing,the proportion of nickel decreases and the proportion of iron increases in Ni-Fe containing minerals produced after roasting.The roasted products are formed as taenite with stone coal as a reductant,the amount of gained Fe is lower but the selectivity for nickel is stronger than that with anthracite as a reductant,so Ni-Fe concentrate ores with high grade of nickel are obtained.
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Key words:
- nickel laterite /
- stone coal /
- anthracite /
- nickel /
- selective reduction
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