Benefication of titania slag by oxidation and reduction treatment
    1.
    发明授权
    Benefication of titania slag by oxidation and reduction treatment 有权
    通过氧化还原处理对二氧化钛矿渣的益处

    公开(公告)号:US06803024B1

    公开(公告)日:2004-10-12

    申请号:US09744531

    申请日:2001-06-15

    IPC分类号: C01G2300

    摘要: This invention relates to a method of treating titania slag to increase the leachability of impurities from the slag consisting of the steps of sizing the titania slag to a particle size from 75 to 850 &mgr;m; oxidizing the sized slag particles at a temperature from about 700° C. to below about 900° C. causing the iron present in the slag to concentrate at the exposed surfaces of the slag particles and/or causing an anatase phase to stabilize in the slag, causing a major portion of the iron in the Fe(II) state to convert to the Fe(III) state, and causing the titanium in the Ti(III) state to be converted to the Ti(IV) state; and reducing the oxidized slag in a reducing atmosphere from about 700° C. to about 950° C. to convert a major portion of the iron in the Fe(III) state to the Fe(II) state. The invention also relates to a method of beneficiating titania slag to increase the TiO2 content thereof wherein the above treated slag is leached with acid.

    摘要翻译: 本发明涉及一种处理二氧化钛矿渣的方法,以增加炉渣杂质的浸出性,其中包括将二氧化钛炉渣的尺寸调整为75至850μm的粒度; 在约700℃至低于约900℃的温度下氧化大小的矿渣颗粒,导致炉渣中存在的铁浓缩在炉渣颗粒的暴露表面和/或使锐钛矿相稳定在炉渣中 ,使Fe(II)状态的铁的大部分转化为Fe(III)态,并使Ti(III)态的钛转化为Ti(IV)态; 并将还原气氛中的氧化炉渣从约700℃降低至约950℃,以将Fe(III)状态的铁的主要部分转化为Fe(II)状态。 本发明还涉及一种选择二氧化钛矿渣以增加TiO 2含量的方法,其中上述处理的炉渣用酸浸出。

    PROCESSING OF METAL CHLORIDE SOLUTIONS AND METHOD AND APPARATUS FOR PRODUCING DIRECT REDUCED IRON
    2.
    发明申请
    PROCESSING OF METAL CHLORIDE SOLUTIONS AND METHOD AND APPARATUS FOR PRODUCING DIRECT REDUCED IRON 审中-公开
    金属氯化物解决方案的处理及生产直接还原铁的方法和装置

    公开(公告)号:US20090095132A1

    公开(公告)日:2009-04-16

    申请号:US11917287

    申请日:2006-06-15

    申请人: John David Winter

    发明人: John David Winter

    IPC分类号: C21B15/00

    摘要: A process and apparatus for regeneration of acid and metal from spent acid liquors includes the steps of, optionally, concentrating (110) the liquor to a concentrated liquor or solid, pyrohydrolysing (114) to regenerate the acid and form metal oxide pellets, and reducing the oxide to metal in a two stage reduction reactor (116, 118) using a partially combusted fuel as reducing agent. Also disclosed is a two-stage reduction process and reactor for production of direct reduced iron (DRI) from iron oxide ores or wastes, including a first stage (416) in which the oxide feed is contacted with a fuel and a sub-stoichiometric amount of an oxygen source to produce a lower oxidation state oxide, and a second stage (418) in which the lower oxidation stage oxide is contacted with off-gases from the first stage to produce iron metal.

    摘要翻译: 用于从废酸液体再生酸和金属的方法和装置包括以下步骤:任选地将(110)浓缩液体(110)至浓缩液体或固体,热解(114)以再生酸并形成金属氧化物颗粒,并还原 使用部分燃烧的燃料作为还原剂的二级还原反应器(116,118)中的金属氧化物。 还公开了用于从氧化铁矿石或废物生产直接还原铁(DRI)的二级还原方法和反应器,包括第一级(416),其中氧化物进料与燃料接触,亚化学计量 的氧源以产生较低氧化态氧化物,以及第二阶段(418),其中较低氧化阶段氧化物与来自第一阶段的废气接触以产生铁金属。