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    • 2. 发明授权
    • Direct fuel-fired furnace arrangement for the recovery of gallium and
germanium from coal fly ash
    • 直接燃煤炉装置,用于从煤飞灰中回收镓和锗
    • US4643110A
    • 1987-02-17
    • US882762
    • 1986-07-07
    • Bohdan LisowyjDavid HitchcockHenry Epstein
    • Bohdan LisowyjDavid HitchcockHenry Epstein
    • C22B7/02C22B41/00C22B58/00F23G5/12
    • C22B7/02C22B41/00C22B58/00Y02P10/212Y10S588/90
    • A furnace arrangement utilizes a single vertically disposed shaft furnace incorporating the features of pellet drying and hardening, oxidizing heat-up, reducing roast and gas separation. The upper portion of the furnace dries and hardens "green" pellets while at the same time subjecting them to an oxidizing atmosphere and temperature increase. A stack of the pellets slowly moves downwardly through a transistion zone to a reducing atmosphere in a lower portion of the furnace. A heated reducing gas circulates through this lower portion and out of the furnace through a recovery system of the furnace arrangement. After the sublimate carried by the reducing gas is removed, the reducing gas is supplemented and returned to the lower portion of the furnace to again produce a reducing atmosphere. A smaller branch of cooled reducing gas enters the lower portion of the furnace adjacent the bottom to cool the pellet residue immediately prior to removal from the furnace.
    • 熔炉装置采用单一垂直设置的竖炉,其结合了颗粒干燥和硬化,氧化加热,减少烘烤和气体分离的特征。 炉的上部干燥并硬化“绿色”颗粒,同时使其处于氧化气氛和温度升高。 一堆沉淀物缓慢地向下移动通过转移区域到炉底部的还原气氛。 加热的还原气体通过该炉底部的回收系统循环通过该下部并离开炉。 在除去由还原气体承载的升华后,还原气体被补充并返回到炉的下部,以再次产生还原气氛。 冷却还原气体的较小分支进入邻近底部的炉的下部,以在从炉中取出之前立即冷却颗粒渣。