| 摘要 |
<p>1,225,590. Digestion of titanium ores. TITAN G.m.b.H. 28 April, 1969 [11 May, 1968], No. 21629/69. Headings C1A and C1N. Digestion of titanium ores with HCI of at least 35% strength is effected in stages in a continuous flow system of 2 or more seriesconnected reactors of high mixing intensity by passing ore and HCI co-currently (ore/HCl mixture temperature 25-60‹C.) into a first reactor, and thence into succeeding reactors at higher temperatures, the overall temperature range in the reactors being 65-105‹ C., and then withdrawing the digestion solution together with solid residue, from the last reactor. The reactors may be a cascade of stirred kettles and total dwell time is not more than 4 hours. The initial ore/HC1 mixture may be heated to 25-60‹ C. by passing it through a heat-exchanger which may be heated by digestion solution from the final reactor. The heat in each reactor derives from the exothermic TiCl 4- forming reaction, and the temperatures in the reactor system are stabilized by adjusting flow of reactants. The digestion solution is further processed by removal of solids and by precipitation of FeCl 2 .4H 2 O before hydrolysis to TiO 2 .</p> |
