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    • 47. 发明授权
    • Bayer process for production of alumina trihydrate, the said improvement relating to separation of aluminate liquor and insoluble residues
    • 用于生产三水合氧化铝的拜耳法,所述改进涉及铝酸盐液体和不溶性残留物的分离
    • US07807119B2
    • 2010-10-05
    • US11573749
    • 2005-09-19
    • Jean-Marc RousseauxGerard PignolYves Magnan
    • Jean-Marc RousseauxGerard PignolYves Magnan
    • C01F7/00
    • B01D21/01B01D21/26B01D21/267C01F7/0646Y10T137/85954
    • A process for the production of alumina trihydrate by alkaline digestion of bauxite using the Bayer process in which aluminate liquor and insoluble residues are separated using a solid/liquid separation device (E; W2; DC) characterised in that the said slurry (21a; 41; 230′) is at least partially passed through a hydrocyclone (H1; H21; H22; H3) to improve and accelerate the separation of the sodium aluminate liquor from the insoluble residues in the slurry (21a; 41; 230′) containing the said liquor and the said residues and that supplies or is derived from the said liquid-solid separation device. In a first embodiment, at least one hydrocyclone is used at the upstream side of the settler-thickener, as clarifier of the pregnant liquor. In a second embodiment, at least one hydrocyclone is used as a thickener of insoluble residue mud. In a third embodiment, a hydrocyclone is used in combination with the causticisation settler.
    • 使用使用固/液分离装置(E; W2; DC)分离铝酸盐液体和不溶性残余物的拜耳法碱性消解铝土矿来生产氧化铝三水合物的方法,其特征在于所述浆料(21a; 41 ; 230')至少部分地通过水力旋流器(H1; H21; H22; H3),以改善和加速铝酸钠液体与含有所述的水蒸气分离器的浆液(21a; 41; 230')中的不溶性残留物的分离 液和所述残留物,并且供应或衍生自所述液固分离装置。 在第一实施方案中,在沉降器 - 增稠剂的上游侧使用至少一种水力旋流器作为怀孕液体的澄清剂。 在第二个实施方案中,使用至少一个水力旋流器作为不溶残余泥浆的增稠剂。 在第三个实施例中,水力旋流器与苛化沉降器组合使用。
    • 50. 发明授权
    • Bayer process for production of alumina trihydrate by alkaline digestion of bauxite, the process comprising a predesilication step
    • 通过铝土矿的碱性消解生产氧化铝三水合物的拜耳法,该方法包括预清洗步骤
    • US07704471B2
    • 2010-04-27
    • US11569290
    • 2005-05-11
    • Eric TizonClotilde Fryns
    • Eric TizonClotilde Fryns
    • C01F7/00
    • C01F7/47C01F7/0613C01F7/062
    • A Bayer process comprises grinding and then digestion of bauxite by bringing it into contact with a sodium aluminate liquor. Digestion consists of forming a slurry that is then treated to separate insoluble residues from the sodium aluminate liquor. The liquor is then crystallized and recycled back to green liquor after having been separated from the alumina trihydrate precipitated during crystallization. The process comprises a predesilication treatment during which the ground bauxite, before digestion, is brought into contact with an aqueous sodic solution that has a content of carbonates, sulphates and possibly chlorides which, expressed as a percentage related to the caustic concentration, has less than half of the corresponding impurities content of the spent liquor. Preferably, the pure caustic soda used to compensate for caustic soda losses in the Bayer circuit, previously injected just after evaporation, is now added in the aqueous sodic solution for the predesilication treatment.
    • 拜耳方法包括通过使其与铝酸钠液体接触来研磨并随后消化铝土矿。 消化由形成浆料组成,然后将其处理以从铝酸钠液体中分离出不溶性残留物。 然后在结晶中沉淀出的三水合氧化铝被分离后,将液体结晶并循环回绿液。 该方法包括预清洗处理,其中在消化之前,研磨的铝土矿与含有碳酸盐,硫酸盐和可能的氯化物的水溶液接触,其以与苛性碱浓度相关的百分比表示,具有小于 废液中相应杂质含量的一半。 优选地,用于补偿先前在蒸发之后注入的拜耳回路中的苛性钠损失的纯苛性钠现在被加入用于预溶解处理的水溶液中。