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    • 3. 发明公开
    • The technology of refining metallic wastes containing zinc in a rotary furnace
    • 技术专家德尔布伦诺芬
    • EP2216419A2
    • 2010-08-11
    • EP09014285.2
    • 2009-11-16
    • Adelt, MilanRaclavsky, MilanMoulis, VlastimilGora, PavelLeitner, Ekhard
    • Adelt, MilanRaclavský, MilanMoulis, VlastimilGora, PavelLeitner, Ekhard
    • C22B5/10C22B5/14C22B7/02C22B19/30C22B19/34C22B13/02F27B7/00
    • C22B5/10C21B13/006C21B13/08C22B5/14C22B7/02C22B13/025C22B19/04C22B19/30C22B19/34F27B7/00Y02P10/214
    • The invention concerns the technology and equipment for refining metallic wastes unsuitable for direct processing in blast furnaces or in steel-making plants because of their high zinc content, such as slurries or dust extracted from steel-making equipment. As a rule, the zinc content in a blast furnace charge is limited to 150 g Zn per ton of furnace charge.
      The essence of the invention consists of the reduction of zinc, lead, and cadmium oxides, the evaporation of said metals, and their subsequent oxidation on the combustion front and in the oxidation zone, as a result of which the dust that originates is extracted from the free furnace space above the charge; at the same time as zinc, lead, and cadmium evaporate, iron is reduced.
      The process is based on the separation of the oxidising and reduction zones in a rotating furnace providing for intense heat and mass transfer.
      The reduction zone is found in the part of the furnace accommodating the charge in a condensed phase where, as a result of the actions of the heat and reduction processes, the charge is modified to the output product with a significantly reduced zinc, lead, and cadmium content. The reduction environment in the reduction zone is achieved by the addition of materials with a high carbon content or metallic iron.
      The oxidation zone is located in the part of the furnace containing combustion products where the reduction products, such as carbon monoxide and metals in gaseous form (e.g. zinc), are oxidised to produce gases and dust. The oxidation zone is created by feeding oxygen or preheated air into the furnace space above the charge, where the quantity of oxygen/air supplied should be such that the CO 2 content in the combustion products at the end of the rotary furnace is at least twice as high as that of CO.
    • 本发明涉及用于精炼金属废料的技术和设备,因为它们的高锌含量,例如从炼钢设备中提取的浆料或粉尘,不适于高炉或炼钢厂的直接加工。 通常,高炉炉料中的锌含量限制在每吨炉装料中150克Zn。 本发明的实质包括锌,铅和镉氧化物的还原,所述金属的蒸发以及它们随后在燃烧前沿和氧化区中的氧化,其结果是从 充电以上的自由炉空间; 在锌,铅和镉蒸发的同时,铁减少。 该方法基于旋转炉中的氧化还原区的分离,提供强烈的热和质量传递。 还原区位于炉内容纳电荷的部分中,该凝结阶段由于热和还原过程的作用而将电荷修改为输出产物,其中锌,铅和铅明显减少 镉含量。 还原区的还原环境是通过加入高碳含量材料或金属铁来实现的。 氧化区位于包含燃烧产物的炉的部分中,其中还原产物,例如一氧化碳和气态金属(例如锌)被氧化以产生气体和粉尘。 氧化区是通过将氧气或预热的空气供入到电荷之上的炉子空间中而产生的,其中供应的氧气/空气的量应使得旋转炉末端的燃烧产物中的CO 2含量至少为两倍 与CO的一样高。