Processing titaniferous ore to titanium dioxide pigment
    4.
    发明授权
    Processing titaniferous ore to titanium dioxide pigment 有权
    将含钛矿石加工成二氧化钛颜料

    公开(公告)号:US06375923B1

    公开(公告)日:2002-04-23

    申请号:US09500207

    申请日:2000-02-07

    IPC分类号: C01G23047

    摘要: A hydrometallurgical process is provided for producing pigment grade TiO2 from titaniferous mineral ores, and in particular from ilmenite ore. The ore is leached with a hydrochloric acid, preferably a recycled solution at high hydrochloric acid concentration, to form a leachate containing titanium and iron chloride and a residue. The leachate may be filtered to separate the leachate from the residue. The leachate is cooled to a temperature sufficient to form crystals of FeCl2, which are separated from the leachate. The leachate may be subjected to a reduction step to reduce Fe+3 to Fe+2, before crystallizing. The leachate is subjected to a first solvent extraction to form a pregnant strip solution containing titanium and ferric ions and a raffinate containing ferrous ions. This strip solution is subjected to a second solvent extraction to form a second strip solution containing ferric ions and a raffinate containing titanium ions. The first strip solution may be subjected to an oxidization step before the second solvent extraction. The second raffinate containing titanium ions is hydrolyzed. The hydrolysis can be by water addition or spray hydrolysis. Iron chloride is converted to iron oxide and hydrochloric acid. All product streams containing chlorides are recycled, producing gaseous hydrochloric acid that is used for regenerating the leaching solution.

    摘要翻译: 提供了一种湿法冶金工艺,用于从钛矿矿石,特别是钛铁矿矿石生产颜料级TiO2。 用盐酸,优选以高盐酸浓度的再循环溶液浸出矿石,以形成含有钛和氯化铁的沥滤液和残渣。 可以将渗滤液过滤以将残留物中的渗滤液分离。 将浸出液冷却至足以形成与浸出液分离的FeCl 2的晶体的温度。 在结晶之前,可以对渗滤液进行还原步骤以将Fe + 3还原成Fe + 2。 对浸出液进行第一次溶剂萃取,形成含有钛和铁离子的含水溶液和含有亚铁离子的萃余液。 将该条状溶液进行第二溶剂萃取以形成含有铁离子的第二条带溶液和含有钛离子的残液。 第一条带溶液可以在第二溶剂萃取之前进行氧化步骤。 含有钛离子的第二残液被水解。 水解可以通过加水或喷雾水解。 将氯化铁转化为氧化铁和盐酸。 所有含有氯化物的产物流被再循环,产生用于再生浸出溶液的气态盐酸。