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    • 50. 发明申请
    • Process For Recovering Alkali Metals and Sulfur From Alkali Metal Sulfides and Polysulfides
    • 从碱金属硫化物和多硫化物中回收碱金属和硫的方法
    • US20090134040A1
    • 2009-05-28
    • US12277822
    • 2008-11-25
    • John Howard GordonAshok V. Joshi
    • John Howard GordonAshok V. Joshi
    • C25C1/00C25B1/00C25C7/00
    • C25C1/02C10G27/00C10G32/00C25B1/00
    • Alkali metals and sulfur may be recovered from alkali polysulfides in an electrolytic process that utilizes an electrolytic cell having an alkali ion conductive membrane. An anolyte solution includes an alkali polysulfide and a solvent that dissolves elemental sulfur. A catholyte solution includes alkali metal ions and a catholyte solvent. Applying an electric current oxidizes sulfur in the anolyte compartment, causes alkali metal ions to pass through the alkali ion conductive membrane to the catholyte compartment, and reduces the alkali metal ions in the catholyte compartment. Sulfur is recovered by removing and cooling a portion of the anolyte solution to precipitate solid phase sulfur. Operating the cell at low temperature causes elemental alkali metal to plate onto the cathode. The cathode may be removed to recover the alkali metal in batch mode or configured as a flexible band to continuously loop outside the catholyte compartment to remove the alkali metal.
    • 碱金属和硫可以在利用具有碱离子传导膜的电解池的电解方法中从碱性多硫化物中回收。 阳极电解液包括碱性多硫化物和溶解元素硫的溶剂。 阴极电解液包括碱金属离子和阴极电解质溶剂。 施加电流在阳极电解液室中氧化硫,导致碱金属离子通过碱金属离子导电膜到阴极电解液室,并减少阴极电解液室中的碱金属离子。 通过除去和冷却一部分阳极电解液以沉淀固相硫来回收硫。 在低温下操作电池会​​使元素碱金属镀在阴极上。 可以除去阴极以分批模式回收碱金属或者配置为柔性带,以连续地环绕阴极电解液室外部以除去碱金属。