公开(公告)号：US5118484A

公开(公告)日：1992-06-02

申请号：US568989

申请日：1990-08-17

申请人： Kwat I. The ,  George D. Fulford

发明人： Kwat I. The ,  George D. Fulford

IPC分类号： C01F7/06 ,  C01F7/47

CPC分类号： C01F7/47 ,  C01F7/0606

摘要： A process is described for removing dissolved silica from process solutions or slurries formed in the Bayer process for producing alumina from bauxite. In the novel process, a Bayer process solution or slurry is contacted with porous agglomerates of a material containing Bayer process desilication product and bonded together by a polymer resin which is resistant to chemical degradation by high concentrations of caustic present in Bayer process liquors. The desilication product is essentially complex hydrated sodium aluminum silicates and typical bonding resins are polyvinylchloride or polypropylene.

摘要翻译： 描述了从用于从铝土矿生产氧化铝的拜耳法中形成的工艺溶液或浆料中除去溶解的二氧化硅的方法。 在新型方法中，拜耳法溶液或浆料与含有拜耳法脱除产物的材料的多孔附聚物接触，并通过聚合物树脂粘合在一起，该聚合物树脂通过高浓度的拜耳法处理液中存在的高浓度苛性碱而耐化学降解。 脱硅产物基本上是复合水合硅酸铝钠，典型的粘结树脂是聚氯乙烯或聚丙烯。

公开(公告)号：US5271844A

公开(公告)日：1993-12-21

申请号：US944045

申请日：1992-09-11

申请人： David R. Chinloy ,  Jean Doucet ,  Michael A. McKenzie ,  Kwat I. The

发明人： David R. Chinloy ,  Jean Doucet ,  Michael A. McKenzie ,  Kwat I. The

IPC分类号： C01F7/06 ,  C02F3/08 ,  C02F3/12 ,  C02F3/34

CPC分类号： C02F3/34 ,  C01F7/06 ,  C02F3/1231 ,  C02F3/082 ,  Y02W10/15 ,  Y10S210/908

摘要： In a process for biodegrading under highly alkaline conditions organics in a waste stream derived from a Bayer processing system for producing aluminum oxides,i) the waste stream being typical of oxalate waste streams resulting from alkaline treatment of bauxite, the oxalate waste streams being rich in oxalates, formates, acetates, benzoates and sodium ions and having a pH in excess of 8,ii) treating the highly alkaline waste stream to neutralize and thereby lower pH and to reduce sodium ion concentration prior to introducing the waste stream into a bioreactor,iii) biodegrading the oxalates in the bioreactor by use of Pseudomonas genus microorganisms, andiv) discharging at least a portion of the biodegraded waste stream, the improvement being characterized by:a) introducing the highly alkaline waste stream rich in sodium ions to the bioreactor to avoid the treatment of step ii),b) biodegrading the organics in the waste stream with the Pseudomonas genus microorganisms characterized by ATCC 53883 deposited microorganism and its derivatives which are functionally biologically equivalent to ATCC 53883, andc) wherein the biodegradation of organics, degrades in addition to the oxalates in the waste stream, the acetates, the formates and the benzoates to yield the biodegraded waste stream.

摘要翻译： 在用于生产氧化铝的拜耳处理系统的废物流中在高碱性条件下有机物进行生物降解的方法中，i）废弃物流是典型的由铝土矿碱处理产生的草酸盐废物流，所述草酸废物流富含 草酸盐，甲酸盐，乙酸盐，苯甲酸盐和钠离子，pH值超过8，ii）在将废物流引入生物反应器之前，处理高碱性废物流中和从而降低pH值并降低钠离子浓度，iii ）通过使用假单胞菌属微生物生物降解生物反应器中的草酸盐，以及iv）排出至少一部分生物降解的废物流，其改进的特征在于：a）将富含钠离子的高碱性废物流引入生物反应器 避免处理步骤ii），b）用假单胞菌属微生物表征废物流中有机物的生物降解 d由ATCC 53883保藏的微生物及其在功能上与ATCC 53883生物学等效的衍生物，以及c）其中有机物的生物降解除了废物流中的草酸盐，乙酸盐，甲酸盐和苯甲酸盐之外降解以产生生物降解 废物流。

公开(公告)号：US5560876A

公开(公告)日：1996-10-01

申请号：US430896

申请日：1995-05-04

申请人： Claude Boulanger ,  Andrew N. Carruthers ,  Robert L. Clegg ,  Kwat I. The

发明人： Claude Boulanger ,  Andrew N. Carruthers ,  Robert L. Clegg ,  Kwat I. The

IPC分类号： B01J2/10 ,  C01F7/02 ,  C22B1/24 ,  B29B9/08

CPC分类号： C01F7/025 ,  B01J2/10 ,  C22B1/24 ,  C01P2004/50 ,  C01P2004/51 ,  C01P2004/61 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/21

摘要： A process for producing strong, essentially dust-free agglomerates from dust created by an industrial operation carried out, for example, on an ore or mineral, e.g. during the thermal conversion of a material containing predominantly gibbsite to sub-alpha alumina by a multistage thermal process having at least one intermediate stage. The process comprises grinding particles of binder material containing undercalcined alumina to a median particle size of less than 30 microns and to a specific surface area in the range of 90-300 m.sup.2 /g; combining about 1-4 parts by weight of the dust with one part by weight of the ground binder material to form combined solids; mixing the combined solids with water to produce agglomerates, the total amount of added water being about 0.8-1.2 parts by weight for every part by weight of the ground binder material, plus about 0.08 to 0.12 parts by weight for every part by weight of the dust; and optionally aging the resulting agglomerates in a closed environment at a temperature of at least 80.degree. C. for at least one hour in at least 50% humidity. The water is mixed with the combined solids by intensive mixing in a mixer equipped with a mixing motor, the water being added according to the following scheme: (a) 40-80% of the total amount of water is added to the combined solids at a rate such that no more than 10 minutes are required for complete addition; (b) optionally allowing a period of time to pass after the addition of the water in step (a) before proceeding further while continuing the intensive mixing; (c) commencing the addition of the remainder of the water and measuring a characteristic of said mixture corresponding to its viscosity and using the measurement as a reference value; and (d) continuing the addition of the remainder of the water while continuing to measure the characteristic of the mixture, the water being added at such a rate that the characteristic of the mixture remains the same as the reference value during the addition or varies by less than .+-.5%.

公开(公告)号：US5171887A

公开(公告)日：1992-12-15

申请号：US827895

申请日：1992-01-30

申请人： Kwat I. The

发明人： Kwat I. The

IPC分类号： C07C51/02 ,  C07C55/07

CPC分类号： C07C55/07 ,  C07C51/02

摘要： A process for producing oxalic acid, sodium oxalate or mixtures thereof comprises treating crude sodium oxalate solids or slurry, such as produced by the Bayer process in treating bauxite. The crude sodium oxalate solids or slurry include at least aluminum metal ions as well as other metal ions common to the Bayer process. The removal process comprises:dissolving the crude sodium oxalate in an aqueous solution to form a solution of sodium oxalate;separating insolubles from the solution;passing the solution through an ion exchange column to convert sodium oxalate, the ion exchange column having a bed of cation exchange resin of the acidic type, the solution as it passes over the bed of resin exchanging sodium ions of the sodium oxalate with hydrogen ions of the resin to produce sodium hydrogen oxalate acid, oxalic acid or mixtures thereof depending upon the strength of acidity of the resin, the exchanged sodium ions and the Al metal ions remaining on the bed of resin; andrecovering the sodium hydrogen oxalate, oxalic acid or mixtures thereof as the effluent solution from the ion exchange column.

摘要翻译： 用于生产草酸，草酸钠或其混合物的方法包括处理粗制草酸钠固体或浆料，例如通过拜耳法处理铝土矿中的浆料。 粗制草酸钠固体或浆料至少包括铝金属离子以及拜耳法共有的其他金属离子。 去除方法包括：将粗制草酸钠溶解在水溶液中以形成草酸钠溶液; 从溶液中分离不溶物; 使溶液通过离子交换柱以转化草酸钠，该离子交换柱具有酸性型阳离子交换树脂床，该溶液在其经过草酸钠交换钠离子的床上与氢离子交换 根据树脂的酸度，交换的钠离子和残留在树脂床上的Al金属离子的强度，产生草酸氢钠，草酸或其混合物的树脂; 并将作为来自离子交换塔的流出液的草酸氢钠，草酸或其混合物回收。

公开(公告)号：US5296177A

公开(公告)日：1994-03-22

申请号：US972506

申请日：1992-11-06

申请人： Kwat I. The ,  Dirk Noteboom ,  Robert L. Clegg

发明人： Kwat I. The ,  Dirk Noteboom ,  Robert L. Clegg

IPC分类号： C01F7/02 ,  C22B1/24 ,  B29B9/08

CPC分类号： C22B1/24 ,  C01F7/025 ,  C01P2004/50 ,  C01P2006/10 ,  C01P2006/21

摘要： A process for producing agglomerates from dust (especially electrostatic precipitator dust) collected from a process involving the thermal conversion of a material containing gibbsite to sub-alpha alumina and alpha alumina, and the agglomerates so formed. The process involves binding the dust particles together using water and undercalcined alumina taken from an intermediate stage of the same thermal conversion that originally produces the dust. The added undercalcined alumina is ground, in order to create fresh surfaces, to a median particle size of less than 30 microns and a specific surface area of about 130 to 300 m.sup.2 /g. About 1-4 parts by weight of the dust are mixed with every part by weight of the ground undercalcined alumina. A special procedure is employed for mixing the solids and water which makes use of intensive mixing. At first about 50-80% by weight of the estimated amount of water required is mixed with the solids in a single addition and the mixing is carried out for at least about 30 minutes. The remainder of the water is then added at a slow rate of addition while the mixing is continued. The resulting agglomerates are aged for at least 2 hours at a temperature of at least 80.degree. C. in an atmosphere of high relative humidity in order to strengthen the agglomerates. Calcining without sintering may also be carried out. The resulting dust agglomerates can be handled without significant fracturing or dust generation, contain no added contaminants, are inexpensive to produce and can be returned to the product stream of the thermal conversion process that initially produced the dust.

摘要翻译： 从包含三水铝石的材料的热转化为亚α氧化铝和α氧化铝的方法收集的灰尘（特别是静电除尘器粉尘）的聚集体的方法以及如此形成的附聚物。 该方法包括使用水和未煅烧的氧化铝将灰尘颗粒结合在一起，该氧化铝从最初产生灰尘的相同热转化的中间阶段获取。 将添加的未煅烧的氧化铝研磨以产生新鲜的表面，至少于30微米的中值粒度和约130至300m 2 / g的比表面积。 将大约1-4重量份的粉尘与每个重量的地下未煅烧的氧化铝混合。 采用特殊的方法来混合固体和水，这种混合使用了强烈的混合。 首先将约50-80重量％的所需水的估计量与单一添加物中的固体混合，并进行混合至少约30分钟。 然后在混合持续的同时以缓慢的添加速率加入剩余的水。 所得附聚物在高相对湿度的气氛中在至少80℃的温度下老化至少2小时，以加强附聚物。 也可以进行没有烧结的煅烧。 所产生的灰尘团块可以在没有显着的压裂或产生粉尘的情况下被处理，不含添加的污染物，制造成本便宜，并且可以返回到最初产生灰尘的热转化过程的产物流中。