(東北大學(xué) 材料與冶金學(xué)院，沈陽 110004)
摘 要: 通過正交試驗(yàn)，研究紅土鎳礦熔融堿法提硅過程中反應(yīng)溫度、反應(yīng)時間、堿礦質(zhì)量比及攪拌速度對SiO2提取率的影響。結(jié)果表明：試驗(yàn)過程中各因素對SiO2提取率的影響由大到小的順序?yàn)榉磻?yīng)溫度＞反應(yīng)時間＞堿礦質(zhì)量比＞攪拌速度；最佳的試驗(yàn)條件為反應(yīng)溫度550 ℃，反應(yīng)時間20 min，堿礦質(zhì)量比4׃1，攪拌速度400 r/min；按照最佳條件進(jìn)行實(shí)驗(yàn)，SiO2的提取率可達(dá)93%以上，鎳、鐵和鎂等元素富集于渣中，氧化鎳的質(zhì)量含量達(dá)到2.92%。
關(guān)鍵字: 紅土鎳礦；熔融堿；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
