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    Process of purifying gypsum
    3.
    发明授权
    Process of purifying gypsum 失效
    净化石膏的工艺

    公开(公告)号：US5500197A

    公开(公告)日：1996-03-19

    申请号：US784580

    申请日：1991-10-29

    申请人： Dieter Grone

    发明人： Dieter Grone

    IPC分类号： B01D53/50 ,  C01F11/46 ,  B04C5/26 ,  C01B17/22 ,  C01F5/12

    CPC分类号： B01D53/501 ,  C01F11/468

    摘要： The process for purifying gypsum suspensions, particularly those formed in a flue gas desulfurizing plant, includes feeding the gypsum suspension (9) to a first hydrocyclone (1), which is operated to produce an underflow (11) with a comparatively high underflow concentration and an overflow fed to a collecting tank (2). The underflow (11) of the first hydrocyclone stage is further diluted to a form another underflow with a lower solids content in a suspension tank (3) and then is fed to a second hydrocyclone stage (4), the overflow of which is also fed to the collecting tank (2). Depending on purity of the gypsum required or attained, the gypsum contained in an underflow (14) of the second hydrocyclone stage (4) is either immediately dewatered and removed or is first fed to one or more hydrocyclone stages, which operate analogously. The combined overflows (15) of the first and second or further hydrocyclone stages are fed from the collecting tank (2) to a third hydrocyclone stage (6). In a thickener (8) solid particles are removed from the overflow (17) of the third hydrocyclone (6) and the clear effluent (23), which is an overflow from the thickener (8), is used for diluting in the suspension tank (3).

    摘要翻译： 用于净化石膏悬浮液，特别是在烟道气脱硫设备中形成的石膏悬浮液的方法包括将石膏悬浮液（9）进料到第一个水力旋流器（1），该第一水力旋流器（1）被运行以产生具有较高下溢浓度的下溢流（11） 送到收集罐（2）的溢流器。 第一个水力旋流器阶段的下溢（11）被进一步稀释成另一个底流，在悬浮罐（3）中具有较低的固体含量，然后被送入第二个水力旋流器级（4），其溢流也被送入 到收集罐（2）。 根据所需或获得的石膏的纯度，第二旋液分离器阶段（4）的下溢（14）中所含的石膏或者立即脱水并除去，或首先进料到一个或多个类似地进行的水力旋流分级器。 第一和第二或另外的水力旋流器级的组合溢流（15）从收集罐（2）进料到第三水力旋流器级（6）。 在增稠剂（8）中，固体颗粒从第三个水力旋流器（6）的溢流部分（17）中取出，而来自增稠器（8）的溢出物的澄清流出物（23）用于在悬浮液中稀释 （3）。

    Sulfate removal from magnesium chloride
    4.
    发明授权
    Sulfate removal from magnesium chloride 失效
    从氯化镁除去硫酸

    公开(公告)号：US3819815A

    公开(公告)日：1974-06-25

    申请号：US88803869

    申请日：1969-12-24

    申请人： KAISER ALUMINIUM CHEM CORP

    发明人： LAM H

    IPC分类号： C01F5/12 ,  C01F5/30 ,  C01B17/16

    CPC分类号： C01F5/12 ,  C01F5/30

    摘要： SULFATE IMPURITIES IN MOLTEN MAGNESIUM CHLORIDE MAY BE RAPIDLY AND EFFECTIVELY REMOVED WITH SIMULTANEOUS PRODUCTION OF MAGNESIUM OXIDE BY DISPERSING FINELY DIVIDED CARBON IN THE MOLTEN MAGNESIUM CHLORIDE PHASE. THE RESULTANT MAGNESIUM OXIDE MAY THEN BE REMOVED BY ALLOWING IT TO SETTLE TO THE BOTTOM OF THE MOLTEN BATH AND WITHDRAWING PURIFIED MAGNESIUM CHLORIDE FROM THE UPPER PORTION OF THE BATH.

    Recovery of magnesium values from magnesium and sulfate containng aqueous salt solutions
    6.
    发明授权
    Recovery of magnesium values from magnesium and sulfate containng aqueous salt solutions 失效
    从镁和硫酸盐回收镁含量水溶液

    公开(公告)号：US3567378A

    公开(公告)日：1971-03-02

    申请号：US3567378D

    申请日：1967-09-18

    申请人： NAT LEAD CO ,  TRACY COLLINS BANK AND TRUST C

    发明人： FERRIS LOCKWOOD W

    IPC分类号： C01F5/10 ,  C01F5/12 ,  C01D5/00 ,  C01F5/32

    CPC分类号： C01F5/12 ,  C01F5/10

    摘要： A PROCESS FOR RECOVERING MAGNESIUM VALUES FROM AQUEOUS SALT SOLUTIONS CONTAINING MAGNESIUM AND SULFATE IONS, COMPRISING THE ADDITION THERETO OF SUFFICIENT ALKALI METAL CHLORIDE SALTS, SPECIFICALLY SODIUM AND/OR POTASSIUM CHLORIDE, TO PROVIDE FOR CONVERSION OF ALL OF THE MAGNESIUM VALUES TO MAGNESIUM CHLORIDE AND ALSO TO PROVIDE SUFFICIENT ALKALI METAL ION TO COMBINE WITH THE SULFATE THE PRESENCE OF STEAM AT ABOUT 500-750*C., PREFERABLY 600-700*C., TO CONVERT THE MAGNESIUM CHLORIDE VALUES TO MAGNESIUM OXIDE WITH EVOLUTION OF HYDROGEN CHLORIDE, WATER WASHING THE CALCINATE TO SOLUBILIZE THE SOLUBLE SALTS INCLUDING SALTS OF SODIUM, POTASSIUM, LITHIUM AND BORON, AND SEPARATING THE MAGNESIUM OXIDE FROM THE SOLUBILIZED SALTS. THE MAGNESIUM OXIDE OBTAINED IN THIS WAY IS OF HIGH PURITY AND MAY BE REACTED WITH HYDROCHLORIC ACID, SUCH AS THAT EVOLVED FROM THIS PROCESS, TO PRODUCE HIGH PRUITY MAGNESIUM CHLORIDE FOR USE IN THE ELECTROLYTIC PRODUCTION OF MAGNESIUM METAL.

    Alkaline Earth Oxides For Green Processes For metals and other Material
    8.
    发明申请
    Alkaline Earth Oxides For Green Processes For metals and other Material 审中-公开
    用于绿色工艺的碱性氧化物用于金属和其他材料

    公开(公告)号：US20140305346A1

    公开(公告)日：2014-10-16

    申请号：US13862623

    申请日：2013-04-15

    申请人： Indra Neelameggham

    发明人： Ramaswami Neelameggham ,  Robert E. Brown

    IPC分类号： C01F11/08 ,  C22C24/00 ,  C22B26/22 ,  C25C1/02 ,  C01F5/12 ,  C22B26/20

    CPC分类号： C01F11/08 ,  C01B17/745 ,  C01D5/10 ,  C01F5/12 ,  C04B2/00 ,  C04B2/10 ,  C04B2/102 ,  C04B2/104 ,  C05D9/02 ,  C22B26/20 ,  C22B26/22 ,  C25C1/02 ,  C25C3/04 ,  Y02P20/133 ,  Y02P40/42

    摘要： The present invention teaches the method to use the sulfate or sulfites based raw materials, such as magnesium, calcium and other alkative earth sulfates or sulfites to produce the respective oxides in a carbon five basis, by using sulfur as the fuel and the reductant. The invention also utilizes renewable energy such as solar thermal or green electricity wherever possible. This approach provides a green process, of ultra-low carbon dioxide emission, for the production of magnesium, other alkaline earth metals and other material which requires alkaline earth oxide, such as in the production of carbon free Portland cement requiring lime. The invention also provides a useful outlet for waste streams leading to sustainable processes. The cost of the production of these precursors are kept low by concurrently producing a saleable by-product—sulfuric-acid.

    摘要翻译： 本发明教导了使用硫酸盐或亚硫酸盐基原料如镁，钙和其它碱土金属硫酸盐或亚硫酸盐的方法，通过使用硫作为燃料和还原剂来生产碳五种各自的氧化物。 本发明尽可能地利用可再生能源，例如太阳能热能或绿色电力。 这种方法提供了一种超低二氧化碳排放的绿色过程，用于生产需要碱土金属氧化物的镁，其他碱土金属和其它材料，例如生产需要石灰的无碳硅酸盐水泥。 本发明还为导致可持续过程的废物流提供了有用的出口。 通过同时生产可销售的副产物 - 硫酸，这些前体的生产成本保持较低。

    Process of producing magnesia with sulfuric acid recycle
    9.
    发明授权
    Process of producing magnesia with sulfuric acid recycle 失效
    用硫酸回收生产氧化镁的工艺

    公开(公告)号：US4096235A

    公开(公告)日：1978-06-20

    申请号：US731890

    申请日：1976-10-13

    申请人： Harry Edward Cross ,  Wolfgang Krieger ,  Eberhard Anschutz ,  Lothar Reh ,  Martin Hirsch

    发明人： Harry Edward Cross ,  Wolfgang Krieger ,  Eberhard Anschutz ,  Lothar Reh ,  Martin Hirsch

    IPC分类号： C01F5/12 ,  C01F5/40

    CPC分类号： C01F5/12 ,  C01F5/40

    摘要： This invention relates to a process of producing magnesia from magnesium-containing carbonate ores, which comprises leaching with sulfuric acid, subsequently neutralizing the solution with magnesia, separating the undissolved impurities, crystallizing magnesium sulfate under pressure and above 150.degree. C so the crystals have from 1.5 to 4 moles of water per magnesium sulfate molecule and thermally decomposing the latter to form magnesia and SO.sub.2, recovering sulfuric acid from the sulfur dioxide produced in the decomposing steps and recycling the sulfuric acid to the leaching stage.

    摘要翻译： 本发明涉及一种由含镁碳酸盐矿石生产氧化镁的方法，其中包括用硫酸浸出，随后用氧化镁中和溶液，分离未溶解的杂质，在压力和150℃以上使硫酸镁结晶，使晶体从 每个硫酸镁分子1.5至4摩尔水，并将其热分解形成氧化镁和SO 2，从分解步骤中产生的二氧化硫中回收硫酸并将硫酸再循环至浸出阶段。