公开(公告)号：US07704471B2

公开(公告)日：2010-04-27

申请号：US11569290

申请日：2005-05-11

申请人： Eric Tizon ,  Clotilde Fryns

发明人： Eric Tizon ,  Clotilde Fryns

IPC分类号： C01F7/00

CPC分类号： C01F7/47 ,  C01F7/0613 ,  C01F7/062

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20070178041A1

公开(公告)日：2007-08-02

申请号：US11569290

申请日：2005-05-11

申请人： Eric Tizon ,  Clotilde Fryns

发明人： Eric Tizon ,  Clotilde Fryns

IPC分类号： C01F7/02

CPC分类号： C01F7/47 ,  C01F7/0613 ,  C01F7/062

摘要： Bayer process, comprising grinding (L, B) and then digestion (N2, A) of a bauxite by bringing it into contact with a sodium aluminate liquor (20b, 120b). Digestion consists of forming a slurry (3a, 103) that is then treated to separate insoluble residues (5a, 105a) from the sodium aluminate liquor. The liquor is then crystallized (D) and recycled back to green liquor (20, 120) after having been separated from the alumina trihydrate (11, 111) precipitated during crystallization. The process comprises a predesilication treatment (P) during which the ground bauxite is brought before digestion 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, is less than half the corresponding impurities content of the spent liquor (8, 108). Preferably, the pure caustic soda used to compensate for caustic soda losses in the Bayer circuit that was previously injected just after evaporation is now added in the aqueous sodic solution for the predesilication treatment.

摘要翻译： 拜耳法，其包括通过使其与铝酸钠液体（20b，120b）接触来研磨（L，B）然后消化铝土矿（N 2，A）。 消化物包括形成浆液（3a，103），然后将其从铝酸钠液体中分离出不溶性残留物（5a，105a）。 然后在从结晶中沉淀的三水合氧化铝（11,111）中分离出液体之后，将液体结晶（D）并循环回绿液（20,120）。 该方法包括预消解处理（P），在该预处理处理（P）期间，研磨的铝土矿在消化之前与具有含碳酸盐，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，较少 超过废液的相应杂质含量的一半（8,108）。 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。