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    Method of producing tantalum or niobium powder from compact bodies
    1.
    发明授权
    Method of producing tantalum or niobium powder from compact bodies 失效
    从紧凑体内生产ANT粉或铌粉的方法

    公开(公告)号：US3635693A

    公开(公告)日：1972-01-18

    申请号：US3635693D

    申请日：1969-01-27

    申请人： STARCK HERMANN C FA

    发明人： FRIEDRICH HANS JOACHIM ,  MEYER HORST

    IPC分类号： C01B6/00 ,  C22C1/04 ,  B22F9/00

    CPC分类号： C22C1/045 ,  C01B6/00

    摘要： A block of tantalum or niobium is first stripped of superficial impurities by immersion in an acid bath, for instance hydrofluoric acid. Thence it is dried in a vacuum and saturated with hydrogen under high pressure and heat. This embrittles the body which is fragmented into coarse metal-hydride particles. The brittle fragments are crushed to a powder of the desired fineness and the powder is cleaned in boiling acid then degassed in a vacuum under heat to transform the interstitial hydride to the pure-metal powder.

    摘要翻译： 首先通过浸入酸浴（例如氢氟酸）中将钽或铌块块剥离成表面杂质。 然后在真空中干燥并在高压和高温下用氢饱和。 这会破坏碎片化成粗大的金属氢化物颗粒的身体。 将脆性碎片粉碎成所需细度的粉末，并将粉末在沸腾酸中清洗，然后在真空中加热脱气以将间隙氢化物转化为纯金属粉末。

    Process for the recovery of molybdenum from roasted molybdenum concentrates
    7.
    发明授权
    Process for the recovery of molybdenum from roasted molybdenum concentrates 失效
    用于从富含钼的浓度中回收钼的方法

    公开(公告)号：US3860419A

    公开(公告)日：1975-01-14

    申请号：US31447272

    申请日：1972-12-12

    申请人： STARCK HERMANN C FA

    发明人： WEBER THEODOR ALEXANDER ,  BORRMANN RALF FRITZ

    IPC分类号： C01G39/00 ,  C01G39/02 ,  C22B34/34 ,  C22B3/00

    CPC分类号： C22B34/34 ,  C01G39/00 ,  C01G39/02

    摘要： A process for recovering molybdenum, either as a compound or as the elemental metal, from roasted molybdenum concentrates, e.g. resulting from the roasting of molybdenum sulfide compositions, comprises digesting the concentrate in aqueous nitric acid containing ammonium nitrate, separating the solid phase from the liquid phase, and treating the solid phase with alkali, preferably ammonium hydroxide, to produce ammonium molybdate. The latter may be converted into metallic molybdenum.

    摘要翻译： 从焙烧的钼精矿中回收钼，作为化合物或作为元素金属的方法，例如， 由硫化钼组合物的焙烧产生的，包括在含硝酸铵的硝酸水溶液中消化浓缩物，从液相中分离固相，用碱处理固相，优选氢氧化铵，生成钼酸铵。 后者可以转化为金属钼。

    Process for producing high-purity niobium and tantalum
    9.
    发明授权
    Process for producing high-purity niobium and tantalum 失效
    生产高纯度铌和钽的方法

    公开(公告)号：US3647420A

    公开(公告)日：1972-03-07

    申请号：US3647420D

    申请日：1969-06-04

    申请人： STARCK HERMANN C FA

    发明人： RESTELLI ATTILIO

    IPC分类号： B22F9/20 ,  C22B34/24 ,  C22B51/00

    CPC分类号： C22B34/24 ,  B22F9/20

    摘要： A process for producing high-purity niobium and tantalum wherein the oxide of the metal is intimately mixed with carbon, e.g., fine graphite, in an amount such that the oxygen is present in a slight excess beyond the quantity of carbon required to react stoichiometrically with the metal oxide. In the first stage, the mixture is subjected to a high vacuum at the order of 10 4 torr. at a temperature of about 1,800* C. to carry out an initial reduction, the reduced material containing about 500 to 10,000 parts per million (p.p.m.) of oxygen. In an intermediate stage, the partly reduced product is combined with finely divided carbon pyrolytically precipitated from a hydrocarbon in a retort permeable to hydrogen (at elevated temperature), so that the carbon is uniformly distributed over the surface of the partly reduced product. In the second state, the mixture of the partially reduced product and the finely divided pyrolytically precipitated carbon is subjected to a temperature below to 2,000* C. and nevertheless sufficient to effect a final reduction. Preferably the latter temperature is about 1,700* C. The resulting high-purity metal (i.e., tantalum or niobium), may be used in electrolytic capacitors.

    摘要翻译： 一种生产高纯度铌和钽的方法，其中金属的氧化物与碳紧密地混合，例如细石墨，其量使得氧以略微超过与化学计量比反应所需的碳的量存在 金属氧化物。 在第一阶段中，将混合物进行10 -4乇的高真空度。 在约1800℃的温度下进行初始还原，所述还原材料含有约500至10,000ppm（p.p.m）的氧。 在中间阶段，部分还原的产物与在可渗透氢气的蒸馏器（在升高的温度下）从碳氢化合物热分解沉淀的细分碳组合，使得碳均匀分布在部分还原产物的表面上。 在第二种状态下，将部分还原产物和精细分解的热解沉淀碳的混合物的温度低于2000℃，然而足以实现最终还原。 优选地，后一温度为约1700℃。所得的高纯度金属（即钽或铌）可用于电解电容器中。