A method and apparatus for germanium reclamation from chemical vapor deposition exhaust gas streams
    2.
    发明公开
    A method and apparatus for germanium reclamation from chemical vapor deposition exhaust gas streams 失效
    从化学气相沉积工艺的废气中回收锗的方法和装置

    公开(公告)号:EP0863218A1

    公开(公告)日:1998-09-09

    申请号:EP98400056.2

    申请日:1998-01-14

    摘要: A continuous system recovers germanium (Ge) from a chemical vapor deposit. A chemical vapor deposit scrubber scrubs a chemical vapor deposit to form a chemical vapor deposit scrubber solution. An equalization and neutralization mixer adds a caustic soda to the chemical vapor deposit scrubber solution to form an equalization and neutralization mixer solution having a pH above 12.0 to maintain the solubility of silicon oxide (SiO 2 ) and hypochlorite (ClO - ). A hypochlorite reduction mixer adds a peroxide to the equalization and neutralization solution to form a hypochlorite reduction solution to reduce hypochlorites. A precipitant and neutralization mixer adds a metal cation such as Epsom Salts (MgSO 4 ) and a caustic soda (NAOH) to the hypochlorite reduction solution to form a precipitant and neutralization solution to precipitate magnesium germanate (MgGeO 3 ) and magnesium silicon trioxide (MgSiO 3 ). A reactor tank adds a cationic polymer to the precipitant and neutralization solution to flocculate the germanium (Ge) and silicon (Si) solids and form a flocculation solution. A plate clarifier collects the flocculation solution to form a flocculated material. A filter press and the dryer processes and drys the flocculated material to produce a dry sludge of germanium (Ge) within a range of 5%-10% by weight.

    摘要翻译: 连续系统中从化学气相沉积恢复锗(Ge)。 一种化学气相沉积洗涤器磨砂的化学气相沉积,以形成化学气相沉积洗涤器溶液。 均衡和中和混合器添加苛性钠的化学气相沉积的洗涤器溶液中,形成的均衡和中和混合器溶液具有高于12.0的pH,以保持氧化硅(SiO 2)的溶解度和次氯酸盐(CLO < - >)。 次氯酸盐还原混合器添加过氧化物的均衡和中和溶液,以形成次氯酸盐还原溶液,以减少次氯酸盐。 甲沉淀剂和中和混合器增加了一个金属阳离子:例如泻盐(MgSO 4)并苛性钠(NaOH)与次氯酸盐还原溶液中以形成沉淀,并中和溶液中沉淀镁锗(MgGeO3)和镁硅三氧化二砷(结构MgSiO3)。 的反应器罐添加阳离子性聚合物的沉淀剂和中和溶液絮凝锗(Ge)和硅(Si)的固体和形成絮凝溶液。 性A板澄清收集絮凝溶液中以形成絮凝的物质。 甲压滤机和干燥过程和DRYS絮凝物质至10%的范围内,5%重量的范围内产生锗(Ge)的干污泥。