Method for preparing iron oxides
    64.
    发明授权
    Method for preparing iron oxides 有权
    铁氧化物的制备方法

    公开(公告)号:US07442362B2

    公开(公告)日:2008-10-28

    申请号:US10836304

    申请日:2004-04-30

    Abstract: Highly pure iron oxides are prepared by reaction of metallic iron, in the form of microspheroidal particles or of scraps or cuttings, with an agitated aqueous solution of a mono- or polycarboxylic acid with a pKa of 0.5 to 6 relative to the first carboxyl and capable of decomposing, by heating in air at 200 to 350 ° C., to carbon dioxide and water, using 0.03 to 1.5 moles of acid per g-atoms of iron, a water/iron weight ration of 1 to 20, and by oxidation of the ferrous carboxilate to ferric salt, with an agent selected from oxygen, mixtures containing oxygen, hydrogen peroxide, organic peroxides and hydroperoxides.

    Abstract translation: 高纯度的氧化铁是通过以微球形颗粒或废料或切屑的形式的金属铁与搅拌的单羧酸或多元羧酸的水溶液相对于第一羧基和pKa为0.5至6的反应制备的 通过在200-350℃的空气中加热分解成二氧化碳和水,每克原子铁使用0.03至1.5摩尔酸,1至20的水/铁重量比,并通过氧化 碳酸亚铁酸盐与铁盐,与选自氧的试剂,含氧的混合物,过氧化氢,有机过氧化物和氢过氧化物。

    Method for Producing Iron Powder Respectively Microalloyed Steel Powder Mainly for Metallurgical Applications and Method for Producing Thereof
    66.
    发明申请
    Method for Producing Iron Powder Respectively Microalloyed Steel Powder Mainly for Metallurgical Applications and Method for Producing Thereof 有权
    主要用于冶金应用的铁粉分解微合金钢粉的生产方法及其生产方法

    公开(公告)号:US20080175740A1

    公开(公告)日:2008-07-24

    申请号:US11949283

    申请日:2007-12-03

    Abstract: A method for manufacturing of iron- respectively micro-alloyed steel powders, starting from fluffy spray roasted iron oxides exhibiting a specific surface area in excess of 2.0 m2/g and residual chloride contents over 440 ppm Cl′, decrease the chloride content in two steps to less than 100 ppm, the specific surface area (BET) of to a pre-selected value of less than 10.0 m2/g, preferably between 0.1 and 2.0 m2/g and reduce the pre-sintered granules exhibiting a bulk density in excess of 1.200 g/dm3.

    Abstract translation: 铁 - 微细合金钢粉末的制造方法,从表面积超过2.0m 2 / g的蓬松喷雾焙烧铁氧化物开始,残余氯化物含量超过440ppm Cl' ,将两步的氯化物含量降低到小于100ppm,比表面积(BET)小于10.0m 2 / g,优选0.1-2.0μm的预选值 减少表现出超过1.200g / dm 3的堆积密度的预烧结颗粒。

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