(中國(guó)科學(xué)院 過(guò)程工程研究所， 北京 100080)
摘 要: 對(duì)Nb2O5在KOH亞熔鹽體系中的溶解行為進(jìn)行了研究， 通過(guò)正交實(shí)驗(yàn)和因素實(shí)驗(yàn)分析了KOH濃度、 反應(yīng)溫度、 反應(yīng)時(shí)間、 攪拌速率和堿礦比等因素對(duì)Nb2O5在KOH亞熔鹽體系中溶解行為的影響。 結(jié)果表明：反應(yīng)溫度和KOH濃度是最重要的影響因素；在一定溫度下，KOH濃度越高越有利于得到可溶性的六鈮酸鉀；而在一定KOH濃度下， 溫度越高越容易得到不溶性的鈮酸鹽沉淀。不溶性沉淀經(jīng)ICP-AES和XRD分析證明為偏鈮酸鉀（KNbO3）。
關(guān)鍵字: Nb2O5； KOH； 溶解行為； 亞熔鹽
（ Institute of Processing Engineering,
Chinese Academy of Sciences, Beijing 100080, China）
Abstract: The dissolution behavior of Nb2O5 in KOH sub-molten salt was investigated. The effect of factors, such as KOH concentration, reaction temperature, reaction time, agitation speed and the mass ratio of alkali-to-ore, on the dissolution behavior of Nb2O5 in KOH sub-molten salt was investigated through orthogonal experiments and factorial experiments. The results show that, the more important factors among them are reaction temperature and KOH concentration, the high KOH concentration is beneficial to the formation of soluble niobate, but the high temperature leads to forming insoluble niobate. The insoluble niobate precipitates formed during Nb2O5 dissolving in KOH sub-molten salt were analyzed by ICP-AES and XRD, which was proved to be KNbO3.
Key words: Nb2O5; KOH; dissolution behavior; sub-molten salt
