PL16952B1

PL16952B1 - A method of converting raw sililinite salts into potassium sodium nitrate or into potassium sodium nitrate and sodium.

Info

Publication number: PL16952B1
Application number: PL16952A
Authority: PL
Filing date: 1930-07-07
Publication date: 1932-10-31

Description

Znanem jest otrzymywanie ze sylwinitu w procesie kolowym azotanu potasowego i sody, W azotanie potasowym stosunek K20 do N równa sie 3,36; stosunek ten jest dla wielu celów nawozowych za wysoki. Po- zadanem byloby przeto wytwarzac taka mieszanine azotanu sodu i potasu, w której ten stosunek odpowiedizialby wymogom, sta¬ wianym przez rolnictwo. Taka mieszanina sklada sie wylacznie z azotanów, które nie wprowadzaja szkodliwych skladników u- bocznych do gleby.W mysl niniejszego wynalazku wytwa¬ rza sie w procesie kolowym taka mieszani¬ ne, otrzymujac, jako uboczne produkty, chlorek amonu albo chlorek amonu i sode.Jako surowce sluza: sylwimit, kwas azoto¬ wy, kwas weglowy, oraz amonjak. Sposób przeprowadza sie nastepujaco: Sylwinit miesza sie z chlorkiem potaso¬ wym tak, aby stosunek sodu i potasu rów¬ nal sie stosunkowi, jaki posiada glaizeryt.Powyzsza mieszanine soli, miesiza sie z otrzymywanym w procesie roztworem chlorku amonowego, zawierajacym siarczan amonu, i wprowadza amonjak. Wydzielony glazeryt oddziela sie, a lug macierzysty o- chladza sie, celem wydzielenia zawartego w nim chlorku amonu. Do tak otrzymanego lu-C^U maGierzysteigo wprowadza sie kwas we- J-. #^jr, dla^\frytwpfzenia weglanu lub dwu¬ weglanu amonowego.Oddzielony glazeryt traktuje sie wegla¬ nem wapnia i kwasem azotowym, pozyczeni odbywa sie nastepujaca przemiana: 2 K2S04. Na2S04 + 3 CaC03 + 6 HN03 == = 4KN03 + 2NaN03 + 3CaS04 + + 3 H20 + 3 C02.Gips, zawierajacy ponadto podwójny siarczan potasowo-wapniowy, jak syngeniit, lub podwójny siarczan o wzorze (K2S04 .S Ca S04 . H20), oddziela sie, a roztwór odparowuje do sucha, uzyskujac pirzytem pozadana mieszanine azotanu potasowo- sodowego.Gips wprowadza sie do poprzednio o- trzymanego roztworu amon jakalnego chlor¬ ku amonu, nasyconego kwasem weglowym, i miesza, pirzyczem tworza sie siarczan a- monu i weglan wapnia. Do tego iroiztworu wprowadza sie, mieszajac, wyregulowana co do wartosci potasu sól surowa, przyczem tworzy sie glazeryt i tak idalej. Zbytecznem staje sie usuwanie wydzielonego weglanu wapnia z lugu, poniewaz glazeryt mieszany bywa zwykle z weglanem wapnia przed dzialaniem kwasem azotowym, Przeciwnie, pozostawienie weglanu wapnia jest korzyst¬ ne ze wzgledów praktycznych, poniewaz, jak wiadomo, dosc trudno jest go odsaczyc.Mozna równiez postepowac w sposób naste¬ pujacy: Sklad surowej soli nie reguluje sie, lecz miesza sie ja z roztworem chlorku amonu, zawierajacym siarczan amonu, o takim skladzie, jaiki posiada ona z natury. Taka sól zawiera znacznie wiecej sodu w stosun¬ ku do potasu, niz glazeryt. Po oddzieleniu od glazerytu, lug macierzysty zawiera chlo¬ rek sodu, chlorek amonu i amonjak. Po¬ wyzszy lug ochladza sie celem wydzielenia pewnej czesci chlorku amonowego, a pozo¬ staly lug poddaje sie procesowi Solwaya.Lug macierzysty z procesu Solwaya zawie¬ ra chlorek amonu i weglan amonu; do tego lugu macierzystego dbdaje sie gips, otrzy¬ many przez traktowanie mieszaniny glaze- rytu i weglanu wapnia kwasem azotowym.W tak zamknietym procesie kolowym otrzymuje sie, jako produkty, azotan pota- sowo-sodowy, chlorek amonu i sode, zuzy¬ wa sie surowce jak: sylwinit, kwas azoto¬ wy, amonjak i kwas weglowy. PLIt is known to obtain potassium nitrate and soda from syllinite in the circular process. In potassium nitrate, the ratio K20 to N is 3.36; this ratio is too high for many fertilization purposes. It would therefore be desirable to produce a mixture of sodium and potassium nitrate in which this ratio would correspond to the requirements of agriculture. Such a mixture consists exclusively of nitrates, which do not introduce harmful by-components into the soil. In the context of the present invention, such mixtures are produced in a circular process, obtaining ammonium chloride or ammonium chloride and sodium as by-products. the raw materials serve: sylwimite, nitric acid, carbonic acid and ammonia. The method is carried out as follows: Sylvinite is mixed with potassium chloride so that the ratio of sodium and potassium is equal to that of the glayserite. The above mixture of salts is mixed with the ammonium chloride solution containing ammonium sulphate obtained in the process and added ammonia. The released glaze is separated and the mother liquor is cooled in order to separate the ammonium chloride contained therein. The e-J- acid is introduced into the Lu-C ^ U matrix thus obtained. # ^ jr, for ammonium carbonate or bicarbonate fractionation. The separated glaze is treated with calcium carbonate and nitric acid, on the basis of the following conversion: 2 K2SO4. Na2SO4 + 3 CaCO3 + 6 HNO3 == = 4KN03 + 2NaNO3 + 3CaSO4 + + 3 H20 + 3 CO2 Gypsum, further including potassium-calcium double sulfate like syngeniite or double sulfate of the formula (K2SO4. S Ca S04. H20) is separated and the solution is evaporated to dryness, yielding the desired potassium-sodium nitrate mixture. The gypsum is poured into a previously obtained ammonium solution of ammonium chloride saturated with carbonic acid, and mixed, and mononium sulphate is formed, and calcium carbonate. The raw salt adjusted in terms of potassium value is introduced into this iroiztwo while stirring, and then the glaze is formed, and so on. It becomes unnecessary to remove the released calcium carbonate from the slurry, as the glazing material is usually mixed with calcium carbonate before treatment with nitric acid. On the contrary, leaving the calcium carbonate on is advantageous for practical reasons, as it is known that it is quite difficult to drain. as follows: The composition of the crude salt is not controlled, but is mixed with an ammonium chloride solution containing ammonium sulphate of such composition as it naturally possesses. Such a salt contains significantly more sodium compared to potassium than glazerite. After separation from the glaze, the mother liquor contains sodium chloride, ammonium chloride and ammonium chloride. After that, the liquor is cooled to release some ammonium chloride and the remaining liquor is subjected to the Solway process. The mother liquor from the Solway process contains ammonium chloride and ammonium carbonate; to this mother liquor the gypsum obtained by treating a mixture of glaze rite and calcium carbonate with nitric acid is obtained. In such a closed cycle process, potassium sodium nitrate, ammonium chloride and sodium are obtained as products, and are consumed raw materials such as: sylwinite, nitric acid, ammonia and carbonic acid. PL

Claims

Patent claims. 1. A method for the production of potassium sodium nitrate, characterized by mixing the silvite with potassium chloride so that the ratio of potassium to sodium is the same as in the glycerite, the obtained salt mixture is mixed with the salt produced therein. In the process, with ammonium chloride slug containing ammonium sulphate, the ammonia is then introduced, and the obtained glazer is separated from the liquor and mixed with nitric acid and calcium carbonate, thanks to which gypsum and a solution of sodium and potassium nitrate are formed, which, when separated, the gypsum is evaporated to obtain solid potassium-sodium nitrate, the glaze rite mother liquor is cooled to release some of its ammonium chloride, then saturated with carbonic acid and mixed with the gypsum obtained by the treatment treating the glaze with calcium carbonate and nitric acid to form a slug of ammonium chloride containing ammonium sulfate and calcium carbonate, which is used in the process as mentioned above.

2. The method according to claim 1, characterized by the fact that sylvinite of a natural composition is mixed with an ammonium chloride solution containing ammonium sulfate to produce a glaze and a mother liquor composed of sodium chloride, ammonium chloride and ammonia, which after cooling in order to separate a part of the ammonium chloride there, and after draining it is subjected to the Solway process, the blackened slurry after the Solway process is mixed with gypsum obtained by treating the glaze with calcium carbonate and nitric acid, thanks to which the the ammonium chloride solution, containing ammonium sulphate and calcium carbonate needed for mixing with sylwimite,

3. Method according to andastrz. 1 and 2, the characteristic of calcium carbonate formed by mixing lyes of chloride and ammonium carbonate with gypsum, is not separated before mixing with a mixture of potassium chloride and syllinite or sylvinite. Chemieverfahren G m. B. H. Zastepca: M. Kryzan, Ph.D., patent attorney Druk L. Boguslawski i Ski, Warsaw. PL