(东北大学 材料与冶金学院，沈阳 110004)
摘 要: 通过正交试验，研究红土镍矿熔融碱法提硅过程中反应温度、反应时间、碱矿质量比及搅拌速度对SiO2提取率的影响。结果表明：试验过程中各因素对SiO2提取率的影响由大到小的顺序为反应温度＞反应时间＞碱矿质量比＞搅拌速度；最佳的试验条件为反应温度550 ℃，反应时间20 min，碱矿质量比4׃1，搅拌速度400 r/min；按照最佳条件进行实验，SiO2的提取率可达93%以上，镍、铁和镁等元素富集于渣中，氧化镍的质量含量达到2.92%。
关键字: 红土镍矿；熔融碱；二氧化硅
（School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract: The effects of reaction temperature, reaction time, mass ratio of alkali to ore, and agitation speed on the extracting ratio of SiO2 during the process of extracting silicon from laterite-nickel ore by molten alkali were investigated through orthogonal experiments. The results show that the sequence of each factor affecting the extracting ratio of SiO2 is reaction temperature＞reaction time＞mass ratio of alkali to ore＞agitation speed. The optimum technological conditions are obtained as reaction temperature of 550 ℃, reaction time of 20 min, mass ratio of alkali to ore of 4׃1 and agitation speed of 400 r/min. The extracting ratio of SiO2 is over 93% under the optimum conditions, the elements of iron, magnesium and nickel are enriched in the residue, and the mass content of NiO is as high as 2.92%.
Key words: laterite-nickel ore; molten alkali; silicon dioxide
