公开(公告)号：US5531906A

公开(公告)日：1996-07-02

申请号：US283532

申请日：1994-08-01

申请人： Susumu Takayama ,  Yasuie Mikami ,  Nobuyoshi Iyatomi ,  Minoru Orikasa

发明人： Susumu Takayama ,  Yasuie Mikami ,  Nobuyoshi Iyatomi ,  Minoru Orikasa

IPC分类号： C01D1/28 ,  C01D1/32 ,  C01F7/00 ,  C02F1/58 ,  C23G1/36 ,  C02F1/62

CPC分类号： C01F7/005 ,  C01D1/32 ,  C23G1/36 ,  C01P2002/22 ,  C01P2002/72 ,  C01P2002/88 ,  C01P2004/03 ,  Y10S210/912

摘要： A process for treating sodium hydroxide waste liquor containing aluminum, comprising the steps of: adding, to aluminum-containing sodium hydroxide waste liquor, at least one of MgO and Mg(OH).sub.2 in an amount of 0.5 to 3 moles with respect to 1 mole of aluminum to cause a reaction at 70.degree. C. or more; and separating and removing a precipitated magnesium-aluminum compound is disclosed. The present invention makes it possible to recover recyclable sodium hydroxide from an aluminum-containing sodium hydroxide waste liquor. Even if the recovering procedure is repeated, no carbonate ions are accumulated. Therefore, it is possible to prevent degradation of the treating solution containing sodium hydroxide. Further, the by-product is a useful compound, and thus, there is no problem in the reprocessing or disposal of the by-product.

摘要翻译： 一种用于处理含有铝的氢氧化钠废液的方法，包括以下步骤：向含铝氢氧化钠废液中加入相对于1的0.5-3摩尔的MgO和Mg（OH）2中的至少一种 摩尔的铝在70℃以上引起反应; 并且公开了分离和除去沉淀的镁 - 铝化合物。 本发明使得可以从含铝氢氧化钠废液中回收可回收的氢氧化钠。 即使重复回收步骤，也不会积聚碳酸根离子。 因此，可以防止含有氢氧化钠的处理液的劣化。 此外，副产物是有用的化合物，因此副产物的后处理或处理没有问题。

公开(公告)号：US06337061B1

公开(公告)日：2002-01-08

申请号：US08406946

申请日：1995-03-28

申请人： Nobuyoshi Iyatomi ,  Yasuie Mikami

发明人： Nobuyoshi Iyatomi ,  Yasuie Mikami

IPC分类号： C01B1790

CPC分类号： C22B34/1259 ,  C01B17/902 ,  C01B17/903 ,  C01G23/001 ,  C22B34/125 ,  Y10S423/02

摘要： For the purpose of efficiently and easily regenerating a sulfuric acid solution having a high concentration and a low impurity content from a metal sulfate-containing waste sulfuric acid solution and waste liquor formed during acid cleaning which are discharged from titanium (IV) oxide-production process carried out according to the sulfuric acid method, titanium present in the metal sulfate-containing waste sulfuric acid solution is removed through a solvent-extraction treatment and then the solution obtained after the solvent-extraction is subjected to a diffusive dialysis treatment.

摘要翻译： 为了从含有金属硫酸盐的废硫酸溶液和在酸清洗期间形成的从钛（IV）氧化物生产过程中排出的废液高效且容易地再生具有高浓度和低杂质含量的硫酸溶液 根据硫酸法进行，通过溶剂萃取处理除去存在于含金属硫酸盐的废硫酸溶液中的钛，然后对溶剂萃取后得到的溶液进行扩散透析处理。

公开(公告)号：US5489423A

公开(公告)日：1996-02-06

申请号：US968099

申请日：1992-10-29

申请人： Yasuie Mikami ,  Nobuyoshi Iyatomi

发明人： Yasuie Mikami ,  Nobuyoshi Iyatomi

IPC分类号： C01B17/90 ,  C01G23/00 ,  C01G23/04 ,  C22B34/12 ,  C01B17/69

CPC分类号： C01G23/001 ,  C01B17/90 ,  C01B17/903 ,  C22B34/125 ,  Y10S423/02

摘要： In order to efficiently and easily recover a spent sulfuric acid exhasuted, for example, in an acid washing liquid or in producing titanium dioxide by a sulfate method in a large amount, as highly concentrated sulfuric acid, bivalent iron ions in the spent sulfuric acid containing metal sulfate are first oxidized into trivalent iron ions, hydrochloric acid is added to such a liquid and then solvent extraction is carried out.

摘要翻译： 为了有效且容易地回收例如在酸性洗涤液中或通过硫酸盐法大量生成二氧化钛的废硫酸作为高浓度硫酸回收，所述废硫酸中含有二价铁离子 金属硫酸盐首先被氧化成三价铁离子，向这种液体中加入盐酸，然后进行溶剂萃取。