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    Process of extraction of aluminum values from coal ash
    6.
    发明授权
    Process of extraction of aluminum values from coal ash 失效
    从煤灰中提取铝值的过程

    公开(公告)号：US4243640A

    公开(公告)日：1981-01-06

    申请号：US908862

    申请日：1978-05-23

    申请人： Robert O. Hill ,  Bernard Raistrick

    发明人： Robert O. Hill ,  Bernard Raistrick

    IPC分类号： C01F7/24 ,  C01F7/66

    CPC分类号： C01F7/24 ,  C01F7/66

    摘要： A process for preparing a solution of high aluminum content from the combustion residue of a solid carbon-containing fuel having a carbon content of 2% or less by weight and an iron content calculated as Fe.sub.2 O.sub.3 of 4% or less by weight is described. The process consists of (a) pretreating said residue with nitric acid at a temperature lower than the next extraction stage which follows and removing the nitric acid solution from the residue and then (b) extracting said treated residue with nitric acid of strength about 30% to 65% by weight strength at about 100.degree. to 225.degree. C., the amount of nitric acid employed in said pretreatment step and in said extraction step being in excess of the cationic equivalent actually dissolved in each step.

    摘要翻译： 描述了从碳含量为2重量％以下的固体含碳燃料的燃烧残渣和Fe2O3计算的铁含量为4重量％以下的方法制备高铝含量的方法。 该方法包括以下步骤：（a）在低于下一次提取阶段的硝酸温度下对所述残余物进行预处理，并从残余物中除去硝酸溶液，然后（b）用浓度为约30％ 在约100至225℃下至65重量％的强度，所述预处理步骤和所述萃取步骤中所用的硝酸的量超过实际溶解于每个步骤中的阳离子当量。

    Method for extracting pure alpha-alumina from clays
    7.
    发明授权
    Method for extracting pure alpha-alumina from clays 失效
    从粘土中提取纯碱性铝的方法

    公开(公告)号：US3586481A

    公开(公告)日：1971-06-22

    申请号：US3586481D

    申请日：1968-10-16

    申请人： LITTLE INC A

    发明人： HYDE RICHARD W ,  MARGOLIN STANLEY V

    IPC分类号： C01F7/24 ,  C01F7/02

    CPC分类号： C01F7/24

    摘要： A METHOD FOR CONVERTING THE ALUMINUM CONTAINED IN CLAYS TO A-ALUMINA WHICH IS OF SUFFICIENT PURITY TO PERMIT ITS DIRECT REDUCTION TO ALUMINUM METAL IN A HALL ELECTROLYTIC CELL. THE METHOD INCLUDES CALCINING THE ALUMINUMCONTAINING CLAY LEACHING THE CALCINED CLAY WITH AQUEOUS NITRIC ACID, FLOCCULATING THE INSOLUBLE IMPURITIES TO AID IN THEIR SEPARATION BY SETTLING AND FILTRATION, CONTACTING THE FILTRATE WITH AN ION-EXCHANGE LIQUID TO REMOVE THE SOLUBLE FERRIC IRON ALONG WITH OTHER METALLIC IMPURITIES, INTRODUCING THE SUBSTANTIALLY PURE ALUMINUM NITRATE SOLUTION INTO A FLUIDIZED BED OF THE PRODUCT ALUMINA MAINTAINED AT A TEMPERATURE PREFERABLY BETWEEN ABOUT 200 AND 210*C., AND HAVING A FLUIDIZING GAS CONTAINING A CONTROLLED AMOUNT OF WATER VAPOR TO HYDROLYZE THE ALUMINUM NITRATE, THUS MAKING IT POSSIBLE TO REMOVE ABOUT 90 TO 95% OF THE NITRATE AS NITRIC ACID VAPOR, AND FINALLY HEATING THE HYDROLYZED DRY PRODUCT FROM THE FLUIDIZED BED TO DRIVE OFF THE REMAINING NITRATE AS OXIDES OF NITOGEN, AND CONVERTING THESE SOLIDS TO A-ALUMINA.