Ultarakova Almagul, Karshyga Zaure, Lokhova Nina, Yessengaziyev Azamat, Kassymzhanov Kaisar, Mukangaliyeva Arailym
The Institute of Metallurgy and Ore Beneficiation, Satbayev University, Almaty 050013, Kazakhstan.
Materials (Basel). 2022 Nov 23;15(23):8314. doi: 10.3390/ma15238314.
This article presents studies on the ammonium fluoride processing of dusts from the reduction smelting of ilmenite concentrate with separation of silicon to obtain titanium dioxide. Optimal conditions for pyrohydrolysis of titanium fluorides were determined. The effects of temperature and duration on the process were studied. The optimal conditions for pyrohydrolysis of titanium fluorides were a temperature of 600 °C and duration of 240-300 min. The degree of titanium fluoride conversion to titanium oxide was 99.5% at these conditions. Titanium dioxide obtained by pyrohydrolysis of titanium fluorides was purified from iron, chromium, and manganese impurities. The effect of hydrochloric acid solution concentration, S:L ratio, and the process duration on the purification degree of titanium fluoride pyrohydrolysis was studied. The following optimum purification conditions were determined: hydrochloric acid solution concentration 12.5-15 wt%, temperature 25-30 °C, S:L = 1:6÷8, duration 20-30 min. The purified titanium dioxide consisted mainly of anatase. The pigmented titanium dioxide of rutile modification with 99.8 wt% TiO was obtained after calcination at 900 °C for 120 min.
本文介绍了关于用氟化铵处理钛铁矿精矿还原熔炼产生的粉尘以分离硅并获得二氧化钛的研究。确定了氟钛酸盐高温水解的最佳条件。研究了温度和时间对该过程的影响。氟钛酸盐高温水解的最佳条件为温度600℃，时间240 - 300分钟。在这些条件下，氟钛酸盐转化为二氧化钛的转化率为99.5%。通过氟钛酸盐高温水解得到的二氧化钛从铁、铬和锰杂质中提纯。研究了盐酸溶液浓度、固液比和处理时间对氟钛酸盐高温水解提纯程度的影响。确定了以下最佳提纯条件：盐酸溶液浓度12.5 - 15 wt%，温度25 - 30℃，固液比 = 1:6÷8，时间20 - 30分钟。提纯后的二氧化钛主要由锐钛矿组成。在900℃煅烧120分钟后，获得了TiO含量为99.8 wt%的金红石型改性颜料二氧化钛。
