METHOD FOR PRODUCING AN ANION-EXCHANGING MINERAL AND USE OF SAID MINERAL

• Main Authors: BULL, CLAUS, SEWARD, PAUL, BEAVERS, KIRSTIN, KUHLMANN, HERMANN, BUHL, JOSEFRISTIAN, SCHENK, MANFRED
• Format: Patent
• Language: English; French; German
• Published: 15.04.1999
• Edition: 6
• Subjects: ADHESIVES; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; DYES; FERTILISERS; FERTILISERS CHARACTERISED BY THEIR FORM; FERTILISERS PRODUCING CARBON DIOXIDE; INORGANIC CHEMISTRY; INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; MANUFACTURE THEREOF; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS; NATURAL RESINS; NON-METALLIC ELEMENTS; PAINTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; POLISHES; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

Mineralien, die Anionen, insbesondere NO3<->, reversibel binden, d.h. austauschen können, sind als Dünge- und Bodenverbesserungsmittel sowie zur Reinigung und Aufbereitung von Wässern - hier insbesondere zur Entfernung von Nitrat - einsetzbar. Bevorzugt handelt es sich bei den verwendeten Mineralien um natürliche oder synthetische mischwertige Metall-Metall-Hydroxysalze, z.B. geschichtete Doppelhydroxide (LDHs), die in den Zwischenschichten austauschbar gebundene Anionen enthalten. Es wird ein Verfahren beschrieben, mit dem besonders geeignete LDHs synthetisiert werden können. Minerals which reversibly fix ions, in particular NO3<->, i.e. that can exchange them, can be used as fertilizers and soil conditioners, as well as for the purification and treatment of water, particularly for the elimination of nitrate. The minerals used are preferably natural or synthetic mixed value metal-metal-hydroxy salts, e.g. layered double hydroxides (LDHs) which contain exchangeably fixed anions in the intermediary layers. The invention relates to a method for synthesizing particularly suitable LDHs. Des minéraux fixant de manière réversible, c'est-à-dire pouvant échanger, les anions, notamment NO3<->, s'utilisent comme engrais et comme améliorants, ainsi que pour l'épuration et le traitement des eaux, en l'occurrence notamment pour éliminer le nitrate. Les minéraux utilisés sont de préférence des sels métalliques ou hydroxydes métalliques naturels ou synthétiques à valence composée, par exemple des hydroxydes doubles revêtus (LDHs), qui contiennent, dans les couches intermédiaires, des anions fixés de manière échangeable. L'invention concerne un procédé permettant de synthétiser des LDHs particulièrement appropriés.