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    • 71. 发明授权
    • Process for recovering aluminum from alunite
    • 从铝酸钠中回收铝的工艺
    • US3996334A
    • 1976-12-07
    • US582806
    • 1975-06-02
    • George J. HartmanVernon R. Ewing
    • George J. HartmanVernon R. Ewing
    • C01F7/02B01J39/02B01J39/04B01J41/04C01D5/00C01F7/06
    • B01J41/043B01J39/02B01J39/043C01D5/008C01F7/0686
    • An improvement in processes for recovering aluminum from alunite ore which processes include roasting the ore to remove water of hydration, removing sulfur and potassium compounds from the roasted ore by a procedure including a final leaching step resulting in a residue and a solution containing potassium sulfate, effecting partial recovery of potassium sulfate from the solution by crystallization with some potassium sulfate being bled off from the mother liquor, converting aluminum values in the residue to alkali metal aluminates by digesting the residue with alkali metal hydroxide including a substantial amount of sodium hydroxide, removing silicon from the alkali metal aluminates leaving a waste desilication product, recovering aluminum values from the desilicated aluminates by precipitation, circulating the mother liquor from the precipitation step to digestion as contaminated sodium hydroxide is bled off, the improvement which comprises enhancing the economics of the overall process by introducing therein an ion exchange procedure in which potassium hydroxide for the first leaching step is produced through ion exchange by use of potassium sulfate and sodium hydroxide, a further improvement being the use of the desilication product as the ion exchange agent.
    • 从铝酸钙矿石中回收铝的方法的改进包括焙烧矿石以除去水合水,通过包括残留物的最终浸出步骤和含有硫酸钾的溶液的方法从焙烧的矿石中除去硫和钾化合物, 通过用母液中的一些硫酸钾结晶从溶液中部分地回收硫酸钾,通过用包括大量氢氧化钠的碱金属氢氧化物将残留物消化,将残余物中的铝转化成碱金属铝酸盐,除去 来自碱金属铝酸盐的硅离开废弃的脱硅产物,通过沉淀从脱铝的铝酸盐中回收铝的值,将母液从沉淀步骤循环到被污染的氢氧化钠的消解中,其改进包括提高整体的经济性 过程 通过在其中引入离子交换方法,其中通过使用硫酸钾和氢氧化钠通过离子交换产生用于第一浸出步骤的氢氧化钾,进一步改进的是使用脱硅产物作为离子交换剂。