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    • 6. 发明申请
    • RECOVERY OF SODA FROM BAUXITE RESIDUE
    • 从BAUXITE RESIDUE恢复SODA
    • WO2012145797A1
    • 2012-11-01
    • PCT/AU2012/000443
    • 2012-04-27
    • COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATIONSMITH, PeterHARATO, Takuo
    • SMITH, PeterHARATO, Takuo
    • C01D1/38C01F7/06C01F7/14
    • C01D1/38C01F7/0606C01F7/066C01F7/47
    • A process for recovery of soda from Bayer process bauxite residue comprises the steps: (a) leaching bauxite residue with sulphuric acid to dissolve soda in DSP in bauxite residue therein; (b) neutralizing the slurry of step (a) with caustic materials to precipitate partially dissolved silica, alumina and calcium, and separating the insoluble portion with precipitated materials by filtration to obtain clear liquor of sodium sulphate (c), processing the resulting liquor by membrane electrochemical process to recover caustic soda and sulphuric acid. The caustic soda is returned to the Bayer process and the sulphuric acid is returned to the leaching process. Consequently, the process can be fully integrated with the Bayer process to reduce caustic soda make-up substantially which would be ordinarily lost. Furthermore the characteristics of the leached and neutralized bauxite residue are changed to reduce its hazardous nature and facilitate improved management of the residue disposal area by the use of clean electric power and non-volatile sulphuric acid.
    • 从拜耳法铝土矿渣中回收苏打水的方法包括以下步骤:(a)用硫酸浸出铝土矿渣,将其中的铝土矿渣中的苏打溶解在铝土矿中; (b)用苛性物质中和步骤(a)的浆料以沉淀部分溶解的二氧化硅,氧化铝和钙,并通过过滤将沉淀的物质分离出不溶部分,得到透明的硫酸钠(c),将所得的液体加工成 膜电化学工艺回收苛性钠和硫酸。 苛性苏打回到拜耳法,硫酸回到浸出过程。 因此,该过程可以与拜耳法完全整合,以大大减少苛性钠组合,通常会损失。 此外,改变了浸出和中和的铝土矿残渣的特性,以减少其危险性质,并通过使用清洁电力和非挥发性硫酸来改善残渣处理区的管理。