公开(公告)号：US20210347649A1

公开(公告)日：2021-11-11

申请号：US17384827

申请日：2021-07-26

申请人： GO HIGHER ENVIRONMENT GROUP CO., LTD.

发明人： Futai Chen ,  Yongqian Chu ,  Yan Yang ,  Liqiang Bai

IPC分类号： C01D3/16 ,  C01D5/16 ,  C01D9/16 ,  B01D1/26 ,  B01D9/00 ,  C02F9/00 ,  B01D61/14

摘要： An industrial waste salt resourceful treatment method comprises the following steps: the industrial waste salt is sequentially subject to dissolving, chemical pre-purification, deep purification, organic matter concentration reduction, adsorption and oxidation decolorization and multi-effect evaporative crystallization to respectively obtain sodium sulfate, sodium chloride and sodium nitrate crystals; the crystallization temperature of sodium sulfate is in a range of 75° C. to 85° C.; the crystallization temperature of sodium chloride is in a range of 60 to 70° C.; and the crystallization temperature of sodium nitrate is in a range of 45° C. to 55° C. An industrial waste salt resourceful treatment device is further provided.

公开(公告)号：US11027999B2

公开(公告)日：2021-06-08

申请号：US16550805

申请日：2019-08-26

申请人： Veolia Water Technologies, Inc.

发明人： Sebastien Bessenet ,  Timothy J. Rittof

IPC分类号： C02F9/00 ,  B01D9/00 ,  C02F1/04 ,  C02F1/28 ,  C02F1/44 ,  C01D5/16 ,  C01D3/06 ,  C02F1/52 ,  C02F101/10 ,  C02F101/12 ,  C02F103/36

摘要： A process for treating wastewater or waste brines that include sodium and chloride ions. The waste brine is concentrated and thereafter directed to a Mirabilite crystallizer that produces hydrated sulfate salt crystals and a first solution. The hydrated crystals are melted to form an aqueous sulfate solution that is directed to a sodium sulfate crystallizer which produces sodium sulfate salt crystals. The first solution produced by the Mirabilite crystallizer is directed to a nanofiltration device which produces a permeate stream and a reject stream containing sulfate removed by the nanofiltration device. The permeate stream is directed to a sodium chloride crystallizer that produces sodium chloride salt crystals. The reject stream is recycled to the Mirabilite crystallizer.

公开(公告)号：US10414667B2

公开(公告)日：2019-09-17

申请号：US15748528

申请日：2016-06-01

申请人： RHODIA OPERATIONS

发明人： Dominique Horbez ,  Enrico Drioli

IPC分类号： C01D5/00 ,  C01D5/02 ,  B01D61/36 ,  C01B33/193 ,  C01D5/18 ,  C01D5/16 ,  C02F1/44 ,  C02F101/10 ,  C02F103/34

摘要： A process for the recovery of sodium sulfate from water, in particular from water deriving from a silica manufacturing process.

公开(公告)号：US20190002300A1

公开(公告)日：2019-01-03

申请号：US16063476

申请日：2016-12-21

申请人： Yara Dallol BV

发明人： Richard W. CHASTAIN ,  Ingrid T. BUCKHURST ,  Antoine LEFAIVRE ,  Thomas H. NEUMAN

IPC分类号： C01D5/10 ,  C01D5/16

摘要： There are provided methods for the production of potassium sulphate. The methods comprise contacting an aqueous potassium- and sulphate-containing composition with magnesium chloride (MgCl2), thereby obtaining a composition comprising kainite; optionally concentrating the kainite from the composition; reacting the kainite with magnesium sulphate (MgSO4) and potassium sulphate (K2SO4) so as to convert the kainite into leonite (K2SO4.MgSO4.4H2O); optionally contacting the leonite with water to remove excess MgSO4 and contacting the leonite with water so as to leach the MgSO4, contained in the leonite, and to at least substantially selectively precipitate potassium sulphate (K2SO4), and further involving a process brine sulphate control step, based on bloedite precipitation, to control the overall level of sulphate in the method. The method according to the invention can be operated at higher temperatures, in particular at temperatures above 35° C. and does not require a cooling step at 20 to 25° C. The method produces potassium sulphate with a low amount of chloride.

公开(公告)号：US20180222758A1

公开(公告)日：2018-08-09

申请号：US15748528

申请日：2016-06-01

申请人： RHODIA OPERATIONS

发明人： Dominique HORBEZ ,  Enrico DRIOLI

IPC分类号： C01D5/02 ,  C01D5/16 ,  C01B33/193 ,  B01D61/36 ,  C02F1/44

CPC分类号： C01D5/02 ,  B01D61/364 ,  B01D2311/04 ,  B01D2311/2642 ,  B01D2311/2649 ,  C01B33/193 ,  C01D5/16 ,  C01D5/18 ,  C02F1/447 ,  C02F2101/101 ,  C02F2103/34 ,  Y02W10/37

摘要： A process for the recovery of sodium sulfate from water, in particular from water deriving from a silica manufacturing process.

公开(公告)号：US5792441A

公开(公告)日：1998-08-11

申请号：US729148

申请日：1996-10-11

申请人： Michael Paleologou ,  Rokhsareh Thompson ,  Craig J. Brown ,  Michael Sheedy

发明人： Michael Paleologou ,  Rokhsareh Thompson ,  Craig J. Brown ,  Michael Sheedy

IPC分类号： B09B3/00 ,  B01J39/04 ,  C01B11/02 ,  C01B17/90 ,  C01D5/16 ,  C02F1/44 ,  D21C9/14 ,  C01D5/00

CPC分类号： C01B17/904 ,  C01B11/023 ,  C01D5/16 ,  Y10S423/14

摘要： A process employing a fixed-resin bed Acid Retardation Unit (ARU) to separate spent acid from chlorine dioxide generators into a de-acidified sodium sulfate component and a purified sulfuric acid component. The de-acidified sodium sulfate produced is returned to the chemical recovery cycle of the kraft mill in place of acidic chlorine dioxide generator effluent thereby avoiding the destruction of alkalinity in pulp mill liquors. In addition, sulfuric acid is purified providing an opportunity for reuse in various mill applications, and/or concentrated and recycled to the generator. Alternatively, to avoid high evaporation costs, the purified acid can be used to regenerate a cation-exchange unit (CEU) used in the conversion of sodium chlorate to a sodium chlorate/chloric acid mixture which is fed to the generator in place of sodium chlorate and sulfuric acid. Using this approach, the sulfuric acid requirement of chlorine dioxide generators and, in turn, the amount of acidic generator effluent can be reduced. The process is applicable to both atmospheric and subatmospheric chlorine dioxide generators. In the latter case, the concentration of the purified sulfuric acid from the ARU or any other acid separation system can be increased by using a portion of it to dissolve the sodium sesquisulfate by-product from such generators.

摘要翻译： 一种使用固定树脂床酸延迟单元（ARU）将废酸从二氧化氯发生器分离成脱酸的硫酸钠组分和纯化的硫酸组分的方法。 所产生的脱酸硫酸钠返回到牛皮纸磨机的化学回收循环，代替酸性二氧化氯发生器流出物，从而避免纸浆厂液中碱度的破坏。 此外，纯化硫酸提供了在各种研磨应用中再利用的机会，和/或浓缩并再循环到发生器中。 或者，为了避免高的蒸发成本，可以使用纯化的酸来再生用于将氯酸钠转化成氯酸钠/氯酸混合物的阳离子交换单元（CEU），该氯酸钠/氯酸混合物被供给到发生器代替氯酸钠 和硫酸。 使用这种方法，可以减少二氧化氯发生器的硫酸需求，进而降低酸性发生器流出物的量。 该方法适用于大气和低气压的二氧化氯发生器。 在后一种情况下，来自ARU或任何其它酸分离系统的纯化硫酸的浓度可以通过使用其一部分来从这种发生器中溶解倍半硫酸钠副产物而增加。

公开(公告)号：US5520902A

公开(公告)日：1996-05-28

申请号：US345956

申请日：1994-11-25

申请人： Robert L. Zeller, III ,  Walter M. Opalinski

发明人： Robert L. Zeller, III ,  Walter M. Opalinski

IPC分类号： C01D5/16 ,  C01G37/02 ,  C01D5/06

CPC分类号： C01D5/16 ,  Y10S210/913

摘要： Disclosed is a process for making orthorhombic Na.sub.2 SO.sub.4 containing less than 0.1 ppm chromium from a solution of Na.sub.2 SO.sub.4 containing 0.1 to 100 ppm Cr(III). The Cr(III) is oxidized to Cr(VI) at a pH greater than 7, water is evaporated from the solution to precipitate the orthorhombic Na.sub.2 SO.sub.4, and the precipitated orthorhombic Na.sub.2 SO.sub.4 is separated from the solution.

摘要翻译： 公开了从含有0.1至100ppm Cr（III）的Na 2 SO 4溶液中制备含有小于0.1ppm铬的正交Na 2 SO 4的方法。 在大于7的pH下将Cr（III）氧化成Cr（VI），从溶液中蒸发水以沉淀正交的Na 2 SO 4，并将沉淀的正交Na 2 SO 4与溶液分离。

公开(公告)号：US5221528A

公开(公告)日：1993-06-22

申请号：US815090

申请日：1991-12-27

申请人： Pieter Jongema

发明人： Pieter Jongema

IPC分类号： C01D3/06 ,  C01D3/14 ,  C01D3/16 ,  C01D5/16

CPC分类号： C01D3/14 ,  C01D3/16

摘要： In a purification process for brine, impurities such as calcium, magnesium and/or sulphate are precipitated by the addition of calcium hydroxide (Ca(OH).sub.2) and sodium carbonate (Na.sub.2 CO.sub.3). Following NaCl crystallization by evaporation of the brine, a mother liquor is obtained which still contains among others sulphate, potassium and bromide ions. Further concentration of this mother liquor by evaporation results in the precipitation of both NaCl and Na.sub.2 SO.sub.4 and a more strongly concentrated mother liquor with respect to both potassium and bromide remains. This concentrated mother liquor is drained off. Either the precipitated NaCl and Na.sub.2 SO.sub.4 are dissolved in water or the Na.sub.2 SO.sub.4 is dissolved in purified brine or crude brine and then returned to the brine purification process, thereby lowering both the potassium and bromide ion levels in the purified brine. As a consequence the contents of both potassium and bromide of the NaCl are reduced.

公开(公告)号：US4966710A

公开(公告)日：1990-10-30

申请号：US504476

申请日：1990-04-04

申请人： Tai K. Kim ,  Robert P. McClintic

发明人： Tai K. Kim ,  Robert P. McClintic

IPC分类号： B01D15/04 ,  B01J45/00 ,  C01D1/04 ,  C01D5/16

CPC分类号： B01J45/00 ,  C01D1/04 ,  C01D5/16

摘要： A method for removing magnesium and calcium from sodium sulfate solutions to render the solutions suitable for membrane processing, which comprises adjusting the pH of the solutions to about 11 to 13 with sodium hydroxide to form a precipitate containing the bulk of the magnesium and the calcium, removing the precipitate from the resulting partially purified sodium sulfate solution, and contacting the partially purified sodium sulfate solution with a polystyrene divinyl benzene copolymer chelating cation exchange resin having an aminophosphonic functional group and having sodium as the exchangeable cation, to remove essentially all of the magnesium and the calcium from the partially purified sodium sulfate solution.

摘要翻译： 一种从硫酸钠溶液中除去镁和钙以使溶液适合于膜处理的方法，其包括用氢氧化钠将溶液的pH调节至约11至13，以形成含有大部分镁和钙的沉淀物， 从所得部分纯化的硫酸钠溶液中除去沉淀物，并使部分纯化的硫酸钠溶液与具有氨基膦官能团并具有钠作为可交换阳离子的聚苯乙烯二乙烯基苯共聚物螯合阳离子交换树脂接触，以除去基本上所有的镁 和来自部分纯化的硫酸钠溶液的钙。

公开(公告)号：US4474737A

公开(公告)日：1984-10-02

申请号：US457046

申请日：1983-01-10

申请人： Stanislav Najmr ,  Zdenek Jerman ,  Jaroslav Kralicek

发明人： Stanislav Najmr ,  Zdenek Jerman ,  Jaroslav Kralicek

IPC分类号： C01F5/42 ,  C01D5/16

CPC分类号： C01F5/42

摘要： Process of purification of magnesic raw material. Sulphur dioxide is allowed to react with an aqueous suspension of calcinated magnesite, crude or contaminated magnesium oxide, magnesium hydroxide, hydrated magnesium carbonates, or crude crystals of magnesium sulphite, and, after reaching a pH of 3 to 7.5 the reaction mixture is separated into a solid phase at least one fraction of which is rich in MgSO.sub.3.xH.sub.2 O, wherein x stands for 3 or 6, and at least one fraction containing concentrated impurities. The whole process is carried out at least once. A reaction mixture having a pH below 5 can be preferably transferred to pH 5.2 by the addition of an alkali, e.g. magnesium oxide or magnesium hydroxide, whereupon separation of at least two fractions of the solid phase is accomplished. The fractions obtained can be further purified by mixing in a hydrophilic liquid, and by a following separation. The fraction of crude magnesium sulphite crystals can be heated to a temperature over 60 degress C., preferably to 90 to 100 degrees C., whereupon the solution containing magnesium sulphite is separated from solid impurities, or the treated mixture is cooled to a temperature below 60 degrees C. and solid phases are separated into one or more fractions rich in MgSO.sub.3.xH.sub.2 O and to one or more fractions mainly containing impurities. Filtration, sedimentation, or centrifugation can be used for the separation.

摘要翻译： 氧化镁原料净化工艺 使二氧化硫与煅烧的菱镁矿，粗或污染的氧化镁，氢氧化镁，水合碳酸镁或亚硫酸镁的粗晶体的水悬浮液反应，并且在达到3至7.5的pH后，将反应混合物分离成 固相，其至少一部分富含MgSO 4·xH 2 O，其中x代表3或6，和至少一个含有浓缩杂质的馏分。 整个过程至少进行一次。 优选将pH低于5的反应混合物通过加入碱，例如， 氧化镁或氢氧化镁，从而完成固相的至少两个部分的分离。 得到的级分可以通过在亲水性液体中混合，并通过以下分离进一步纯化。 粗亚硫酸镁晶体的分数可以加热到60℃以上，优选加热至90-100℃，由此将含有亚硫酸镁的溶液与固体杂质分离，或将处理过的混合物冷却至低于 将固相分离成富含MgSO 4·xH 2 O的一种或多种级分和主要含有杂质的一种或多种级分。 过滤，沉淀或离心可用于分离。