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9 条记录 (耗时 0.026 秒)

    Process for preparing hydrated alumina consisting essentially of spherical particles by homogeneous precipitation
    3.
    发明授权
    Process for preparing hydrated alumina consisting essentially of spherical particles by homogeneous precipitation 失效
    通过均相沉淀制备基本上由球形颗粒组成的水合氧化铝的方法

    公开(公告)号：US4902494A

    公开(公告)日：1990-02-20

    申请号：US357675

    申请日：1989-05-26

    申请人： Franco Montino ,  Giuseppe Spoto

    发明人： Franco Montino ,  Giuseppe Spoto

    IPC分类号： C01F7/34 ,  C01F7/44 ,  C01F7/46

    CPC分类号： B82Y30/00 ,  C01F7/34 ,  C01P2004/03 ,  C01P2004/32 ,  C01P2004/52 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2004/64

    摘要： A process for preparing hydrated alumina consisting essentially of spherical particles having a narrow granulometric distribution (polydispersion index dw/dn.ltoreq.2) starting from aqueous solution of aluminum sulphate, the molar ratio SO.sub.4.sup.= /Al.sup.3+ being greater than 1, by homogeneous precipitation in the presence of cationic polyelectrolytes, which are soluble under the reaction conditions and have a mean molecular weight higher than one million and an ionicity, deriving from the cationic groups present in the polyelectrolyte, of at least 3 milliequivalents/gram.

    摘要翻译： 制备水合氧化铝的方法，其基本上由具有窄的粒度分布（多分散指数dw / dn 2）的球形颗粒组成，从硫酸铝的水溶液开始，摩尔比SO 4 = / Al 3+大于1，通过均相沉淀 在存在阳离子聚电解质的情况下，其在反应条件下可溶，并且具有高于100万的平均分子量和衍生自聚电解质中存在的阳离子基团的离子性为至少3毫当量/克。

    Process for the preparation of magnetic powders based on .gamma.-Fe.sub.2 O.sub.3
    4.
    发明授权
    Process for the preparation of magnetic powders based on .gamma.-Fe.sub.2 O.sub.3 失效
    基于γ-Fe2O3制备磁粉的工艺

    公开(公告)号：US4224175A

    公开(公告)日：1980-09-23

    申请号：US29937

    申请日：1979-04-13

    申请人： Franco Montino ,  Ariello R. Corradi ,  Erminio Nonato

    发明人： Franco Montino ,  Ariello R. Corradi ,  Erminio Nonato

    IPC分类号： G11B5/706 ,  C01G49/06

    CPC分类号： G11B5/70673

    摘要： A process is disclosed for obtaining acicular magnetic particles of .gamma.-Fe.sub.2 O.sub.3 modified with Fe.sup.++ and Co.sup.++ ions. The product thus obtained and magnetic tapes containing said product are also disclosed. A suspension of acicular .gamma.-Fe.sub.2 O.sub.3 in an aqueous solution of soluble Fe.sup.++ and Co.sup.++ salts is prepared. NH.sub.3 is then added in such quantity that the molar ratioNH.sub.3 /(Fe.sup.++ +Co.sup.++)is between 2.1 and 3, and the whole mass is then heated up to 100.degree.-200.degree. C. When the molar ratio Fe.sup.++ /Co.sup.++ is greater than about 2.5, it is necessary to operate in the presence of a metered quantity of oxygen or of an oxygen-containing gas; when the ratio is smaller or equal to about 2.5, the presence of a metered quantity of oxygen is optional.

    摘要翻译： 公开了一种获得用Fe ++和Co ++离子改性的γ-Fe2O3的针状磁性颗粒的方法。 由此获得的产品和含有所述产品的磁带也被公开。 制备针状γ-Fe2O3在可溶性Fe ++和Co ++盐水溶液中的悬浮液。 然后加入NH 3，使得NH 3 /（Fe +++ Co ++）的摩尔比在2.1和3之间，然后将整个物质加热至100℃-200℃。当Fe ++ / Co ++的摩尔比为 大于约2.5，需要在计量的氧气或含氧气体的存在下操作; 当该比例小于或等于约2.5时，计量的氧的存在是任选的。

    Process for obtaining hyperfine magnetite powder
    5.
    发明授权
    Process for obtaining hyperfine magnetite powder 失效
    获得超细磁铁矿粉的工艺

    公开(公告)号：US4025611A

    公开(公告)日：1977-05-24

    申请号：US552604

    申请日：1975-02-24

    申请人： Franco Montino ,  Luigi Colombo ,  Giuseppe Sironi

    发明人： Franco Montino ,  Luigi Colombo ,  Giuseppe Sironi

    IPC分类号： C01G49/08 ,  H01F1/11 ,  C01G49/02

    CPC分类号： B82Y30/00 ,  C01G49/08 ,  C01P2002/54 ,  C01P2004/38 ,  C01P2004/62 ,  C01P2004/64

    摘要： A process is disclosed for producing magnetite having an equiaxial morphology in the state of a hyperfine powder, starting from a solution of a bivalent iron solution, characterized in that:A. an aqueous suspension of Fe(OH).sub.2 is prepared by reacting an aqueous solution of a ferrous salt with alkali;B. said aqueous suspension of Fe(OH).sub.2 is fed into an autoclave into which is also introduced a quantity of air corresponding to 4-15 normal liters per 100 g of bivalent Fe; andC. the autoclave is then brought to a temperature between 150.degree. and 200.degree. C and maintained at this temperature until the inside pressure has stabilized itself at a constant level, thereby bringing about the formation of the desired magnetite which, once discharged from the autoclave, is washed and dried. The aqueous suspension of Fe(OH).sub.2 subjected to thermal decomposition in the autoclave may have present therein Cu.sup.+.sup.+ion, in a quantity between 0.3 and 1.4% by weight of the bivalent Fe. When Cu.sup.+.sup.+ is present in the aqueous suspension of Fe(OH).sub.2 which is subjected to the thermal decomposition, it is also desirable to have dissolved therein Na.sub.2 S in such a quantity as to provide from 20 to 60 mg of S per 100 g of bivalent Fe.

    摘要翻译： 公开了一种从二价铁溶液溶液开始制造具有超细粉末状态的等轴形态的磁铁矿的方法，其特征在于：

    Process for stabilizing ferromagnetic chromium dioxide
    7.
    发明授权
    Process for stabilizing ferromagnetic chromium dioxide 失效
    稳定铁磁性二氧化铬的方法

    公开(公告)号：US4374118A

    公开(公告)日：1983-02-15

    申请号：US318413

    申请日：1981-11-05

    申请人： Giampiero Basile ,  Giancarlo Boero ,  Emiliano M. Ceresa ,  Franco Montino

    发明人： Giampiero Basile ,  Giancarlo Boero ,  Emiliano M. Ceresa ,  Franco Montino

    IPC分类号： C01G37/027 ,  G11B5/706 ,  H01F1/11

    CPC分类号： G11B5/70636 ,  C01G37/027 ,  C01P2006/42

    摘要： This invention relates to a process for stabilizing ferromagnetic chromium dioxide in respect of water and oxidizable organic compounds which it may contact in magnetic tapes. The process is applicable to a starting CrO.sub.2 having good magnetic properties, i.e. a coercive force not lower than about 400 Oersted, a maximum magnetic induction B.sub.m not lower than about 2500 gauss, and a magnetic induction B.sub.r not lower than about 1600 gauss. The CrO.sub.2 is subjected to a heat treatment at a temperature ranging from 300.degree. to 390.degree. C. in the presence of a gas stream not exerting any oxidizing or reducing action on the compounds of trivalent, tetravalent and hexavalent chromium. Suitable gases are, for example, nitrogen, helium and argon.

    摘要翻译： 本发明涉及一种稳定铁磁性二氧化铬相对于水和可磁化有机化合物的方法，它可以在磁带中接触。 该方法适用于具有良好磁特性，即不低于约400奥斯特的矫顽力，不低于约2500高斯的最大磁感应Bm和不低于约1600高斯的磁感应Br的起始CrO 2。 在不对三价，四价和六价铬的化合物施加任何氧化或还原作用的气流的存在下，在300℃至390℃的温度范围内对CrO 2进行热处理。 合适的气体是例如氮气，氦气和氩气。

    Process for the preparation of silver powder
    9.
    发明授权
    Process for the preparation of silver powder 失效
    银粉制备工艺

    公开(公告)号：US4039317A

    公开(公告)日：1977-08-02

    申请号：US623912

    申请日：1975-10-20

    申请人： Franco Montino ,  Luigi Colombo

    发明人： Franco Montino ,  Luigi Colombo

    IPC分类号： C22B11/00 ,  B01J23/50 ,  B22F1/00 ,  B22F9/26 ,  C22B11/04

    CPC分类号： B01J23/50 ,  B22F9/26 ,  C22B11/04

    摘要： A process is disclosed for preparing silver powders with a controlled apparent density wherein an aqueous silver oxide suspension is treated with hydrogen at a temperature between 60.degree. and 115.degree. and under a partial hydrogen pressure of between 5 and 25 atmospheres. The aqueous silver oxide suspension may be additioned with one or more alkali metal, alkaline earth metal, or silver sulphides. Further the aqueous silver oxide suspension may be additioned with one or more silver salts soluble in water or made soluble by complexing with ammonia, such as ammoniacal silver sulphate, silver nitrate or ammoniacal silver nitrate.

    摘要翻译： 公开了一种用于制备具有可控表观密度的银粉的方法，其中氧化银悬浮液在60至115℃的温度和在5至25个大气压的部分氢气压力下用氢处理。 氧化银水溶液悬浮液可以加入一种或多种碱金属，碱土金属或硫化银。 此外，氧化银水溶液悬浮液可以加入一种或多种可溶于水的银盐或通过与氨络合使其变得可溶，例如氨硫酸银，硝酸银或氨硝酸银。