公开(公告)号：US5869020A

公开(公告)日：1999-02-09

申请号：US873715

申请日：1992-04-22

申请人： Albert Rijkeboer ,  Roelof Den Hond

发明人： Albert Rijkeboer ,  Roelof Den Hond

IPC分类号： C01F7/06 ,  C01F7/02

CPC分类号： C01F7/06 ,  C01F7/0613 ,  C01F7/062

摘要： Process for the production of aluminium hydroxide by digesting bauxite with alkali solution and precipitating aluminium hydroxide from the digestion solution, comprising:a combining bauxite and alkali solution having a caustic concentration of at least 180 grams per liter expressed as sodium carbonate and digesting partly the bauxite in the combined product in a first digestion step at relatively low temperature,b separating reaction product obtained in step a into a liquid phase and a solids/liquid slurry,c combining liquid phase and solids/liquid slurry obtained in step b and digesting the combined product in a second digestion step at relatively high temperature,d releasing heat from the reaction product obtained in step c to preheat liquid phase obtained in step b,e separating the reaction product obtained in step d into a supersaturated sodium aluminate solution and undissolved material,f precipitating aluminium hydroxide from the supersaturated sodium aluminate solution obtained in step e and separating aluminium hydroxide from the spent liquor, andrecycling spent liquor obtained in step f to step a for use as alkali solution.

摘要翻译： 通过用碱溶液消化铝土矿和从消解溶液中沉淀出氢氧化铝来生产氢氧化铝的方法，包括：组合的铝土矿和苛性碱浓度为至少180克/升的碱溶液，表示为碳酸钠并部分地消化铝土矿 在相对低温下的第一消化步骤中的组合产物中，将步骤a中获得的反应产物分离成液相和固体/液体浆料，c将液相和步骤b中获得的固体/液体浆料混合，并将组合 产物在相对较高的温度下进行第二消化步骤，d从步骤c中获得的反应产物中释放热量以预热步骤b中获得的液相，e将步骤d中获得的反应产物分离成过饱和铝酸钠溶液和未溶解的材料， 从过饱和铝酸钠溶液中沉淀出氢氧化铝 在步骤e中碱化并从废液中分离氢氧化铝，并将步骤f中获得的废液再循环到步骤a中用作碱溶液。

公开(公告)号：US5279645A

公开(公告)日：1994-01-18

申请号：US910057

申请日：1992-07-08

申请人： Albert Rijkeboer

发明人： Albert Rijkeboer

IPC分类号： C01F7/06 ,  C22B1/02

CPC分类号： C01F7/0613

摘要： An improved process for the removal of organic matter from bauxite ore containing gibbsite comprises heating the ore under roasting conditions including a roasting temperature of from about 400.degree. C. to about 600.degree. C. with oxygen-containing roasting gas having a moisture content of less than 1% by volume water until the water of crystallization of the alumina present in the treated product is less than 0.5 mole per mole of alumina.

摘要翻译： 用于从含有三水铝矿的铝土矿矿石中除去有机物的改进方法包括在焙烧条件下对矿石进行加热，包括焙烧温度为约400摄氏度至约600摄氏度，含有含水量较低的含氧焙烧气体 直到处理产物中存在的氧化铝的结晶水低于每摩尔氧化铝0.5摩尔为止的水含量为1体积％。