| Patents for C01D 5 - Sulfates or sulfites of sodium, potassium, or alkali metals in general (1,848) |
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| 03/26/2002 | US6361660 Photoelectrochemical device containing a quantum confined group IV semiconductor nanoparticle |
| 03/13/2002 | CN2481695Y Reactor furnace for producing potassium sulfate |
| 02/27/2002 | CN1079697C Producing chemical product by using sugar manufacturing equipment of sugar refinery |
| 02/20/2002 | CN1336323A Method and equipment of preparing potassium sulfate and ammonium potassium chloride with industrial effluent containing ammonium sulfate |
| 02/13/2002 | CN1335261A Physical process of eliminating NaCl from mixed K and Mg salt with high Na salt content |
| 01/30/2002 | CN1078564C Technolpogy of preparing ptoassium sulfate using leopoldite |
| 01/23/2002 | CN1332115A Method of coproducing potassium sulfate while producing synthetic ammonia |
| 01/09/2002 | CN1330612A Method of formulating alkali metal salts |
| 01/09/2002 | CN1330038A Automatic control method of sodium sulfate production line |
| 01/01/2002 | US6334990 Formulation of potassium sulfate, sodium carbonate and sodium bicarbonate from potash brine |
| 01/01/2002 | CA2057418C Cocurrent flow process for the manufacture of sodium sulfite and bisulfite solutions |
| 12/26/2001 | CN1327949A Cool-hot fusion method for preparing anhydrous sodium sulfate and its hot-fusion tower |
| 12/19/2001 | CN1076317C Process for producing potassium sulfate |
| 11/21/2001 | CN1322675A Water-free potassium sulfate preparing process |
| 11/21/2001 | CN1075041C Process for producing potassium sulfate and sodium sulfate simultaneously |
| 11/13/2001 | US6315976 Method of producing potassium sulfate |
| 10/24/2001 | CN1318515A Preparation method of potassium sulfate with sulfate-type salt lake bittern containing potassium salt |
| 10/16/2001 | CA2237425C Method for preparing a salt, particularly potassium chloride, by leaching and cooling a solution thereof |
| 10/10/2001 | EP1140700A1 Process for the recovery of sulphur from lead-acid battery scrap |
| 10/04/2001 | US20010026787 Feeding sulfuric acid and alkali metal chloride to direct fired chamber; withdrawing product |
| 09/26/2001 | CN1314308A Method for preparing potassium sulfate by one section conversion flotation process |
| 09/26/2001 | CN1071707C Process for preparing potassium sulfate with chromium containing sodium sulfate |
| 09/25/2001 | US6294066 Apparatus and process for electrodialysis of salts |
| 09/18/2001 | US6290872 Composition containing at least sodium bicarbonate, preparation method therefor and uses thereof |
| 09/13/2001 | WO2001066235A1 Process for purifying aqueous buffer solutions |
| 09/12/2001 | EP1132488A1 Installation with cooled crystallisers and method for operating the installation |
| 08/22/2001 | EP1124757A1 Process for producing potassium sulfate from potash and sodium sulfate |
| 08/22/2001 | CN1309086A Process for preparing potassium sulfate |
| 08/08/2001 | EP1121327A1 Method of formulating alkali metal salts |
| 08/01/2001 | CN1305954A Process for preparing sodium sulfite from liquid hydrocarbon or waste alkali solution of gasoline |
| 08/01/2001 | CN1305953A Process for preparing potassium sulfate from salt-field carnallite and natrium sulfate at ordinary temp |
| 06/27/2001 | CN1067657C Method for prodn. of potassium sulfate by circulating potassium hydrogen sulfate and decomposing potassium chloride |
| 06/21/2001 | DE10033478A1 Sanitization of processing residues from the potash and rock salt industry comprises dissolving out soluble salts and recovering them as useful products |
| 06/13/2001 | DE19956377A1 Verfahren zur Herstellung von wasserfreiem, hochreinem Natriumsulfid Process for the preparation of anhydrous, high purity sodium sulfide |
| 06/13/2001 | CN1299337A Method of producing potassium sulfate |
| 05/30/2001 | EP1103521A1 Process for the preparation of water free, high-purity sodium sulfide |
| 05/16/2001 | CN2430425Y Reaction furnace for producing anhydrous sodium sulfate |
| 05/02/2001 | EP1094985A1 Method of procucing potassium sulfate |
| 05/02/2001 | CN1065221C Method for producing chloro-free phosphorus potassium fertilizer and coproducing polymerized aluminum iron chloride |
| 05/02/2001 | CN1065213C Process for preparing picromerite |
| 05/01/2001 | US6224731 Apparatus and process for electrodialysis of salts |
| 04/26/2001 | WO2001028925A1 Formulation of potassium sulfate, sodium carbonate and sodium bicarbonate from potash brine |
| 04/26/2001 | CA2387884A1 Formulation of potassium sulfate, sodium carbonate and sodium bicarbonate from potash brine |
| 04/24/2001 | US6221225 Apparatus and process for electrodialysis of salts |
| 04/17/2001 | US6218592 Crystallizing sodium sulfate as glauber's salt; dissolving, recrystallization, recovering, circulation |
| 04/17/2001 | US6217840 Production of fumed silica |
| 04/11/2001 | CN1290655A Gravity separation method for producing potassium sulfate |
| 04/04/2001 | CN1064023C Method for producing hydrogen sulfide |
| 03/07/2001 | CN1286219A Process and equipment for preparing potassium sulfate |
| 03/07/2001 | CN1062844C Process for producing potassium sulfate and its by-product using potash feldspar |
| 02/22/2001 | WO2001012544A1 Production of fumed silica |
| 02/22/2001 | CA2381389A1 Production of fumed silica |
| 02/21/2001 | EP0946408B1 Treatment of chlorine dioxide generator effluent and feed streams with fixed-resin bed |
| 02/21/2001 | EP0796223B1 Co-production of potassium sulfate, sodium sulfate and sodium chloride |
| 02/14/2001 | CN1283588A Process for preparing potassium sulfate with more by-products |
| 02/14/2001 | CN1061947C Liquid phase one step crystallizing process for producing crystal sodium sulphate from nitrate containing brine |
| 01/31/2001 | CN1281822A Method for preparing potassium sulfate by using sulfate type potassium-containing bittern |
| 01/30/2001 | US6180074 Method for processing flue gases containing sulphur oxides |
| 01/24/2001 | EP0858428B1 Method for processing flue gases containing sulphur oxides |
| 01/23/2001 | US6177056 Separation plastic and acid from lead bearing minerals and forming volitilization of sulfur to form sulfur dioxide and scrubbing |
| 01/16/2001 | US6173840 Beneficiation of saline minerals |
| 12/27/2000 | CN1277939A Method for preparing granular potassium sulfate, and the special binder therefor |
| 12/20/2000 | CN1277153A Production process of anhydrous sodium sulfate |
| 12/14/2000 | DE19913103C1 Decontamination of radioactive vaporizer concentrate comprises freeing it of undissolved components, crystallizing out sodium sulfate as the decahydrate, and returning the concentrate to the system |
| 11/30/2000 | WO2000041968A9 Process for the recovery of sulphur from lead-acid battery scrap |
| 11/22/2000 | CN1273941A Process for separating Mg and Li from high-Mg Li-contained bittern |
| 11/22/2000 | CN1273940A Process for preparing safety powder of sodium formate from liquid-state SO2 and solid-state sodium carbonate |
| 11/07/2000 | US6143271 Treating a portion of the potash source and sodium sulfate source such that glaserite is crystallized out of solution and a first mother liquor is produced, converting the glaserite to precipitate potassium sulfate in a second mother liquor |
| 11/02/2000 | EP1048618A1 Process for making gold salt for use in electroplating process |
| 11/01/2000 | CN1057979C Sludge and impurity removing technology for argillaceous glauberite ore |
| 11/01/2000 | CN1057978C Bittern comprehensive utilization method |
| 10/30/2000 | CA2306319A1 Process for making gold salt for use in electroplating process |
| 10/03/2000 | US6126807 Dechlorination from sodium gold chloride, sulfiting; sodium gold sulfite solution can be solidified by a freeze-drying process; use in gold electroplating baths |
| 10/03/2000 | US6126702 Apparatus and method for treating sesquisulfate waste streams |
| 09/05/2000 | CA2205838C Co-production of potassium sulfate and sodium sulfate |
| 08/23/2000 | CN1263866A Process for preparing potassium sulfate by water-nitre method |
| 08/02/2000 | CN1055065C Method for producing crystal anhydrous sodium sulphate from nitrate containing brine |
| 07/20/2000 | WO2000041968A1 Process for the recovery of sulphur from lead-acid battery scrap |
| 07/18/2000 | CA2203510C Co-production of potassium sulfate, sodium sulfate and sodium chloride |
| 07/12/2000 | CN1259487A Technology of preparing potassium sulfate using leopoldite |
| 07/05/2000 | CN1258641A Potassium sulfate producing process of mixing and directly heating potassium chloride and ammonium sulfate |
| 07/05/2000 | CN1258640A Gypsum process of producing potassium sulfate and cement |
| 06/28/2000 | CN1257832A Process for comprehensive application of mirabilite |
| 06/27/2000 | US6080977 Apparatus for concentrating salt-containing solutions with microwave energy |
| 05/31/2000 | CN1254682A Process for preparing both sodium hydroxide and sodium sulfate by secondary causticization of mother liquid from natural alkali carbonization |
| 05/31/2000 | CN1052962C New process for producing potassium sulfate |
| 05/30/2000 | US6068822 Desulforization method and desulfurization apparatus in geothermal power plant |
| 05/17/2000 | CN1052455C Method for catalytic prodn. of potassium sulfate using potassium hydroxide |
| 05/09/2000 | US6060026 Photoelectrochemical device containing a quantum confined silicon particle |
| 04/26/2000 | CN1251350A Method for producing potassium sulfate jointly with biurea |
| 04/20/2000 | WO2000021887A1 Method of formulating alkali metal salts |
| 04/19/2000 | CN1051530C Process for producing potasium sulfate by cold salting-out circulation method |
| 04/13/2000 | CA2284967A1 Method of formulating alkali earth salts |
| 04/05/2000 | EP0827487B1 Method for preparing a salt, particularly potassium chloride, by leaching and cooling a solution thereof |
| 03/29/2000 | CN1248549A Process for preparing high-quality potassium-containing products by salt-field method |
| 03/29/2000 | CN1050866C Process for separating sulphate in mother solution of electrolytic producing chlorate and process for producing sodium chlorate |
| 03/29/2000 | CN1050819C Technology for producing potassium sulfate using flue gas desulfating gypsum |
| 03/23/2000 | WO2000015554A1 Process for producing potassium sulfate from potash and sodium sulfate |
| 03/15/2000 | CN1247161A Metathetical process for preparing potassium sulfate by step-by-step crystallizations and separations |
| 02/01/2000 | CA2085375C Methanol-based chlorine dioxide process |