| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 121 | Process of extracting potassium from flue-dust. | US1914832816 | 1914-04-18 | US1124798A | 1915-01-12 | PEACOCK SAMUEL |
| 122 | Process of obtaining potash salts from seaweed. | US1910542324 | 1910-02-05 | US1010403A | 1911-11-28 | FIRMAN HENRY S; FIRMAN WILLIAM S |
| 123 | POLYHALITE IMI PROCESS FOR KNO3 PRODUCTION | PCT/IL2010000514 | 2010-06-27 | WO2010150266A2 | 2010-12-29 | BONAN MICHAEL; GINZBERG EYAL; MOZES AKIVA; BARNEA EYAL; KESELMAN HUGO; FRIEDMAN GIDEON; FRIM RON; LANGEVELD CORNELIS PETRUS |
| A process for producing KNO3 from polyhalite is disclosed. In a preferred embodiment, the process comprises steps of (a) contacting polyhalite with HNO3; (b) adding Ca(OH)2 to the solution, thereby precipitating as CaSO4 at least part of the sulfate present in said solution; (c) precipitating as Mg(OH)2 at least part of the Mg2+ remaining in said solution by further addition of Ca(OH)2 to the remaining solution; (d) concentrating the solution, thereby precipitating as a sulfate compound at least part of the sulfate remaining in solution; (e) separating at least part of the NaCl from the solution remaining; and (f) crystallizing as solid KNO3 at least part of the K+ and NO3- contained in the solution. The process enables direct conversion of polyhalite to KNO3 of purity exceeding 98.5% and that is essentially free of magnesium and sulfate impurities. | ||||||
| 124 | A PROCESS FOR THE PRODUCTION OF POTASSIUM NITRATE | PCT/IL0100327 | 2001-04-05 | WO0177019A3 | 2002-02-07 | PIPKO GREGORY |
| A method for the production of potassium nitrate by its salting out from an aqueous solution comprising the ions K<+>, C1<->, M<++> and NO3<-> wherein M<++> represents Ca<++> and/or Mg<++>, comprising the following steps; (a) dissolving at least one mineral selected from the group consisting of calcium carbobate, magnesium carbonate, magnesium oxide, calcium oxide, calcium hydroxide, magnesium hydroxide and dolomite, in aqueous nitric acid, in an amount which is approximately stoichiometrically equivalent to the amount of nitrate ions in the solution, or dissolving at least one mineral selected from the group consisting of calcium nitrate and magnesium nitrate, in water; (b) dissolving at least one source for potassium chloride, in the solution obtained at step (a) at temperature higher than 40 DEG C, wherein the amount of the source is chosen such as to obtain an approximately stoichiometric ratio between potassium and nitrate ions and wherein the source is selected from the group consisting of KC1, carnallite, sylvinite, and a mixture of KC1 with MgC12, NaC1, CaC12 or a combination thereof; (c) cooling the solution obtained at step (b) to obtain a precipitate of potassium nitrate. | ||||||
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