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    Method for reprocessing waste acid to form gypsum and iron oxide
    5.
    发明授权
    Method for reprocessing waste acid to form gypsum and iron oxide 失效
    后处理废酸形成石膏和氧化铁的方法

    公开(公告)号：US06416723B1

    公开(公告)日：2002-07-09

    申请号：US09646280

    申请日：2000-09-15

    申请人： Gerhard Auer ,  Günter Lailach ,  Ulrich Meisen ,  Werner Schuy

    发明人： Gerhard Auer ,  Günter Lailach ,  Ulrich Meisen ,  Werner Schuy

    IPC分类号： C01F100

    CPC分类号： C01C1/028 ,  C01F11/46 ,  C01G49/06 ,  C01P2006/12 ,  C01P2006/42 ,  C01P2006/60 ,  C01P2006/62 ,  C01P2006/63 ,  C01P2006/64 ,  C04B11/262

    摘要： Process for the production of gypsum and also of an iron-oxide pigment from the waste acid that accumulates in the course of the production of titanium dioxide in accordance with the sulfate process, characterized in that in a first stage a partial neutralization of the waste acid is effected with a calcium compound subject to precipitation and optionally direct separation of gypsum, subsequently the remaining solution is neutralized further in a second stage subject to precipitation of a deposit containing Ti, Al, Cr, V and optionally Fe(III) and from the solution containing iron sulfate that is obtained after separation of the solids an iron-oxide pigment is produced in a third stage by addition of alkaline compounds and also optionally addition of ammonia and also of an oxidizing agent, ammonia being liberated by addition of CaO and/or Ca(OH)2 from the solution containing (NH4)2SO4 that is obtained after separation of the iron-oxide pigment.

    摘要翻译： 用于生产石膏的方法以及根据硫酸盐法在二氧化钛生产过程中积聚的废酸中的氧化铁颜料的制备方法，其特征在于在第一阶段中将废酸部分中和 由钙化合物进行沉淀和任选地直接分离石膏，随后在第二阶段中进一步中和残留的溶液，沉淀含有Ti，Al，Cr，V和任选的Fe（III）的沉积物，并从 在第三阶段通过添加碱性化合物以及任选地加入氨以及氧化剂产生在固体分离出氧化铁颜料后得到的含有硫酸铁的溶液，通过添加CaO和/ 或Ca（OH）2从含有（NH 4）2 SO 4的溶液中分离出来）。

    Iron oxide pigments
    6.
    发明授权
    Iron oxide pigments 有权
    氧化铁颜料

    公开(公告)号：US07387671B2

    公开(公告)日：2008-06-17

    申请号：US10547598

    申请日：2004-03-04

    申请人： Ulrich Meisen ,  Leslaw Mleczko

    发明人： Ulrich Meisen ,  Leslaw Mleczko

    IPC分类号： C09C1/24 ,  C09C3/00

    CPC分类号： C09C1/24 ,  C01P2004/62 ,  C01P2006/12

    摘要： Iron Oxide pigment containing greater than 99% iron oxide, having a chloride content of less than 0.1% and a mean solid diameter of 10 to 500 μm and methods of making the same are disclosed.

    摘要翻译： 公开了含有大于99％的氧化铁，氯化物含量小于0.1％，平均固体直径为10〜500μm的氧化铁颜料及其制造方法。

    Finely divided isometric hexaferrite pigments with a W-structure, processes for their preparation and their use
    8.
    发明授权
    Finely divided isometric hexaferrite pigments with a W-structure, processes for their preparation and their use 失效
    具有W结构的细分等轴六方晶系颜料，其制备方法及其用途

    公开(公告)号：US4773938A

    公开(公告)日：1988-09-27

    申请号：US918574

    申请日：1986-10-14

    申请人： Gunter Buxbaum ,  Ulrich Meisen ,  Florian Haberey

    发明人： Gunter Buxbaum ,  Ulrich Meisen ,  Florian Haberey

    IPC分类号： C01G49/00 ,  C04B35/26 ,  C09C1/22 ,  C09C1/24 ,  G11B5/706 ,  H01F1/11 ,  C04B14/00

    CPC分类号： C04B35/2608 ,  C01G49/009 ,  C04B35/2633 ,  C09C1/22 ,  G11B5/70678 ,  C01P2002/32 ,  C01P2004/03 ,  C01P2004/20 ,  C01P2004/54 ,  C01P2006/42

    摘要： Finely divided magnetic particles of hexaferrite pigments with a W-structure having the compositionE.sub.x M.sub.m (I) M.sub.n (II) Fe.sub.18 -(m+n)O.sub.27-y D.sub.ywhereinE is at least one element from the group comprising alkaline earth metals, alkali metals, lanthanides or lead,M(I) and M(II) are independently at least element from the group comprising metals or semi-metals andD is at least one element from the group of halogens and chalcogens and0.8.ltoreq.x.ltoreq.1.2,1.0.ltoreq.m.ltoreq.3.0,0.ltoreq.n.ltoreq.8.0,0.ltoreq.y.ltoreq.5.0 andn is the same as y when n>0with the proviso that electroneutrality is preserved,and wherein the hexaferrite pigment particles have substantially the same dimensions in all directions in space are useful in producing magnetic recording media, such as tapes, and are produced by melting a mixture of (=i) metal oxides, hydroxides, hydroxyoxides, carbonates, nitrates or mixtures thereof corresponding to the composition of the W-hexaferrite pigments together with (ii) boron oxide, boric acid, metal borates, SiO.sub.2 or mixtures thereof at temperatures of from 1100.degree. to 1450.degree. C. and then chilling the melt obtained to .ltoreq.600.degree. C. and then tempering the chilled melt at temperatures of from 1000.degree. to 1400.degree. C. for 1 second to 2 hours.

    摘要翻译： 具有组成为Ex Mm（I）Mn（II）Fe18-（m + n）O27-yDy的W结构的六方晶系颜料的细分磁性颗粒，其中E是至少一种元素，包括碱土金属，碱 金属，镧系元素或铅，M（I）和M（II）独立地是至少包含金属或半金属的元素，D是来自卤素和硫属元素的至少一种元素， 当n> 0时，n与y相同，条件是电中性是（i = 0）= 1.0， 并且其中六方晶系颜料颗粒在空间中在所有方向上具有基本相同的尺寸可用于制造磁记录介质，例如带，并且通过熔融（= i）金属氧化物，氢氧化物，羟基氧化物，碳酸酯的混合物 ，硝酸盐或其混合物，其与W-六铁素体颜料的组成以及（ii）氧化硼，硼酸，金属硼酸盐，SiO 2或其混合物，然后将所获得的熔体冷却至600℃，然后在1000-1400℃的温度下回火冷却的熔体1秒至 2小时。

    Process for the production of yellow iron oxide
    10.
    发明授权
    Process for the production of yellow iron oxide 有权
    生产黄色氧化铁的方法

    公开(公告)号：US06534032B2

    公开(公告)日：2003-03-18

    申请号：US09798847

    申请日：2001-03-02

    申请人： Ulrich Meisen

    发明人： Ulrich Meisen

    IPC分类号： C01G4902

    CPC分类号： C09C1/24 ,  C01G49/06 ,  C01P2002/52 ,  C01P2002/60 ,  C01P2002/70 ,  C01P2006/12 ,  C01P2006/62 ,  C01P2006/63 ,  C01P2006/64

    摘要： The present invention relates to a process for the production of an iron oxide yellow by a) adding FeSO4 or FeCl2 with an Fe(III) content of 0.0 to 4.0 mol % Fe(III) and a Mn content of up to 0.7 wt. %, based on the Fe content, to a solution or suspension of an alkaline component that has been heated to a temperature of between 42 and 75° C., and b) oxidizing the suspension formed with an oxidizing agent until all iron(II) has been converted into iron(III) as &agr;-FeOOH, whereby the oxidizing agent is added at a rate such that the oxidation time is between 120 and 600 minutes and the reaction temperature during the entire oxidation time is at least at the temperature at which precipitation occurred.

    摘要翻译： 本发明涉及生产氧化铁黄的方法，其中a）加入Fe（III）含量为0.0-4.0mol％Fe（III）的FeSO 4或FeCl 2，Mn含量高达0.7wt。 基于Fe含量的碱性组分的溶液或悬浮液加热到42至75℃的温度，和b）氧化由氧化剂形成的悬浮液，直到所有的铁（II）具有 被转化为铁（III）作为α-FeO​​OH，由此氧化剂以使得氧化时间在120和600分钟之间并且在整个氧化时间内的反应温度至少在发生沉淀的温度的速率下加入 。