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    • 5. 发明申请
    • PROCESS FOR ENHANCED PRE-REDUCTION OF CHROMITE
    • 加强预处理色素的方法
    • WO2015015250A1
    • 2015-02-05
    • PCT/IB2013/056313
    • 2013-08-01
    • NORTH-WEST UNIVERSITY
    • BEUKES, Johan PaulVAN ZYL, Pieter GideonNEIZEL, Bryson
    • C22B1/02C22B34/32C22C35/00
    • C22B1/02C22B34/32
    • The present invention relates to a process for the partial oxidation of unagglomerated chromite ore and to the use of the claimed process in currently applied ferrochromium production processes. According to a first aspect thereof, the present invention provides a process for the partial oxidation of chromite. The said process includes the steps consisting of: (i) providing a source of unagglomerated chromite ore; (ii) subjecting the source of unagglomerated chromite ore to pre-oxidation at a temperature of 700" C to 1 100°C, both values inclusive; (iii) controlling the above-mentioned pre-oxidation temperature such that maximum migration of iron (Fe) to the surface of the chromite ore particles takes place and minimum Cr203 formation takes place; and (iv) forming a pre-oxidized source of unagglomerated chromite ore wherein maximum migration of iron (Fe) to the surface of the chromite ore particles takes place, as well as minimum Cr203 formation takes place. The present invention further provides for the use of the product prepared in accordance with the foregoing process.
    • 本发明涉及一种用于部分氧化未沉积的铬铁矿矿石的方法和所要求保护的方法在目前应用的铬铁生产方法中的应用。 根据其第一方面,本发明提供了一种亚铬酸盐的部分氧化方法。 所述方法包括以下步骤:(i)提供未凝集的铬铁矿源; (ii)使未沉积的铬铁矿矿源在700℃至1100℃的温度下进行预氧化,包括两个值;(iii)控制上述预氧化温度,使得铁的最大迁移 Fe)到铬铁矿矿石颗粒的表面,并发生最小的Cr 2 O 3形成;(iv)形成未析出的铬铁矿的预氧化源,其中铁(Fe)到铬铁矿矿石表面的最大迁移取 本发明还提供了根据上述方法制备的产品的用途。
    • 6. 发明申请
    • METHOD AND APPARATUS FOR RECOVERING PGM AND FERRO-CHROME FROM PGM BEARING CHROMITE ORE
    • 用于从PGM承载的铬铁矿中回收PGM和FERRO-CHROME的方法和装置
    • WO2014154945A1
    • 2014-10-02
    • PCT/FI2014/050214
    • 2014-03-25
    • OUTOTEC OYJ
    • NÄRHI, Lauri
    • C22B11/02C22B34/32
    • C22B11/02B22F9/082C22B34/32C22C33/04C22C38/18F27B19/04
    • In a method for recovering PGMs and ferrochrome from platinum group metals bearing chromite ore, a concentrate is prepared that contains most of PGMs and chromite of the ore and the concentrate is subjected to a heating step to dry and/or preheat the concentrate, after which the preheated concentrate is smelted under reducing conditions in a DC smelting furnace (14) to produce molten metal alloy containing the PGMs of the feed and molten slag containing the chromium of the feed. The molten slag is tapped from the smelting furnace (14) into an AC slag furnace (16), where iron and chromium are reduced to produce a ferrochrome alloy. PGMs are recovered from the metal alloy tapped from the smelting furnace (14) utilizing hydro-metallurgical processes.
    • 在从含有铬铁矿的铂族金属中回收PGM和铬铁的方法中,制备了含有矿石中大部分PGM和铬铁矿的浓缩物,浓缩物进行加热步骤以干燥和/或预热浓缩物,之后 在直流熔炼炉(14)中将预热的浓缩物在还原条件下熔炼,生成含有进料的PGM和含有进料铬的熔渣的熔融金属合金。 将熔融炉渣从熔炼炉(14)中抽出到一个AC渣滓炉(16)中,其中铁和铬被还原以产生铬铁合金。 使用水力冶金方法从冶炼炉(14)中抽出的金属合金回收PGM。
    • 7. 发明申请
    • METHODS AND SYSTEMS FOR REDUCING CHROMIUM CONTAINING RAW MATERIAL
    • 用于还原含有原料的铬的方法和系统
    • WO2014138401A1
    • 2014-09-12
    • PCT/US2014/021216
    • 2014-03-06
    • MIDREX TECHNOLOGIES, INC.
    • CHEVRIER, Vincent, F.KAKALEY, Russell
    • C21B13/10
    • C22B34/32
    • A method for reducing a chromium containing material, comprising: combining the chromium containing material comprising chromium oxide with a carbonaceous reductant to form a chromium containing mixture; delivering the chromium containing mixture to a moving hearth furnace and reducing the chromium containing mixture to form a reduced chromium containing mixture; delivering the reduced chromium containing mixture to a smelting furnace; and separating the reduced chromium containing mixture into chromium metal and slag. The method also comprises agglomerating the chromium containing mixture in a granulator or the like. The chromium containing mixture has an average particle size of less than about 200 mesh (about 75 μm).
    • 一种还原含铬材料的方法,包括:将包含氧化铬的含铬材料与碳质还原剂混合以形成含铬混合物; 将含铬混合物输送到移动的炉底炉中并还原含铬混合物以形成还原的含铬混合物; 将还原的含铬混合物输送到冶炼炉; 并将还原铬混合物分离成铬金属和炉渣。 该方法还包括在造粒机等中将含铬混合物凝聚。 含铬混合物的平均粒度小于约200目(约75μm)。
    • 8. 发明申请
    • FLY ASH AND FLY ASH LEACHATE TREATMENT
    • FLY ASH和FLY ASH LEACHATE TREATMENT
    • WO2013176907A1
    • 2013-11-28
    • PCT/US2013/040495
    • 2013-05-10
    • FMC WYOMING CORPORATIONHALVERSON, AileenREICHL, Aaron
    • HALVERSON, AileenREICHL, Aaron
    • B09B3/00
    • C22B7/02A62D3/33A62D2101/08A62D2101/24A62D2101/43C22B30/04C22B34/22C22B34/32
    • The present invention is directed to a process of treating fly ash and/or fly ash leachate to immobilize heavy metals contained in such fly ash and/or fly ash leachate, which process comprises treating such fly ash and/or fly ash leachate with a soluble ferrous compound under alkaline conditions. This process may be conducted in the absence of any pH modification, mixing (in the sense of a physical blending with a solid material), drying or heating steps, making it practical for treatment of alkaline fly ash (and other coal combustion by-products) which is currently stored in landfills or wet ash lagoons,, particularly fly ash which has been recovered from flue gas streams treated with highly alkaline materials such as trona, bicarbonate or limestone and the like.
    • 本发明涉及一种处理飞灰和/或飞灰渗滤液以固定包含在这种飞灰和/或飞灰渗滤液中的重金属的方法,该方法包括用可溶性物质处理这种飞灰和/或飞灰渗滤液 亚铁化合物在碱性条件下。 该方法可以在没有任何pH变化,混合(在固体材料的物理共混的意义上),干燥或加热步骤的情况下进行,使其可用于处理碱性飞灰(和其他燃煤副产物 ),其目前存储在垃圾填埋场或湿灰烬泻湖中,特别是已经用高碱性物质如天然碱,碳酸氢盐或石灰石等处理的烟道气回收的飞灰。