SU831731A1

SU831731A1 - Method of producing rotassium nitrate

Info

Publication number: SU831731A1
Application number: SU762369059A
Authority: SU
Inventors: Игорь Дмитриевич Соколов; Валентин Иванович Сергеев; Юрий Степанович Сафрыгин; Александр Васильевич Муравьев; Нина Кимовна Андреева
Original assignee: Всесоюзный Научно-Исследовательскийи Проектный Институт Галургии
Priority date: 1976-06-07
Filing date: 1976-06-07
Publication date: 1981-05-23

Description

1one

Изобретение относитс к производству калийной селитры.This invention relates to the production of potassium nitrate.

Известны способы получени нитрат кали , основанные на взаимодействии нитрата кальци с сульфатом кали ЦKnown methods for producing potassium nitrate are based on the interaction of calcium nitrate with potassium sulfate.

Недостатком известных способов вл етс -сложность процесса, св занна с необходимостью поддерживать в реакционной смеси определенный . избыток одного из реагентов.A disadvantage of the known methods is the complexity of the process associated with the need to maintain a certain amount in the reaction mixture. excess of one of the reagents.

Наиболее близким к изобретению по технической сущности и достигаемому результату вл етс способ пополучени нитрата кали , заключающийс во взаимодействии нитрата кальци и сульфата кали в растворе с последующим отделением осгадка сульфата кальци , кристаллизацией нитрата кали и возвращением маточного раствора в цикл 2.The closest to the invention in technical essence and the achieved result is the method of obtaining potassium nitrate, which consists in the interaction of calcium nitrate and potassium sulfate in solution, followed by separation of calcium sulfate and crystallization of potassium nitrate and returning the mother liquor to cycle 2.

Недостатком известного способа йвл етс сложность поддержани опре еленной величины избытка, при нару ..шении которой наблюдаютс потери целевого продукта.The disadvantage of the known method is the difficulty of maintaining a certain amount of excess, with violation of which losses of the desired product are observed.

Цель изобретени - упрощение способа .The purpose of the invention is to simplify the method.

Поставленна цель достигаетс тем, что взаимодействие нитрата кальци и сульфата кали в растворе осуществл ют при рН 1,5-5,5 с последующим отделением выпавшего в осадок сульфата кальци , кристаллизацией нитрата кали и возвращением маточного раствора в цикл.This goal is achieved in that the interaction of calcium nitrate and potassium sulfate in a solution is carried out at a pH of 1.5-5.5, followed by the separation of precipitated calcium sulfate, crystallization of potassium nitrate and returning the mother liquor to the cycle.

Процесс осуществл ют следующим образом.The process is carried out as follows.

Сульфат кали раствор ют в оборот ном растворе, получаемом после отде0 лени нитрата кали , и при рН 1,55 ,5, которое создаетс , например, серной кислотой, обрабатывают нитратсмл кальци при 40-100 с.Potassium sulfate is dissolved in the circulating solution obtained after separation of potassium nitrate, and at pH 1.55, 5, which is created, for example, with sulfuric acid, is treated with calcium nitrates at 40-100 seconds.

Выпавший в осадок гипс отдел ют фильтрацией и промывают водой. Маточ5 ный раствор и концентрированные промывные воды охлаждают и выпавший в осадок нитрат кали отдел ют и-сушат с получением готового продукта. The precipitated gypsum is separated by filtration and washed with water. The mother liquor and concentrated washings are cooled and the precipitated potassium nitrate is separated and dried to obtain the finished product.

0 Маточный раствор и промыэные воды объедин ют и возвращают на стадию растворени сульфата кали .0 The mother liquor and the washed waters are combined and returned to the step of dissolving potassium sulfate.

Благодар осуществлению процесса при рН 1,5-5. ,5 исключаетс возмож5 ность загр знени исходными реагентами и образование сингенита даже при стехиометрическом соотношении реагентов..Due to the implementation process at pH 1.5-5. , 5 excludes the possibility of contamination with initial reagents and the formation of syngenite even with a stoichiometric ratio of reagents.

Пример. 89,16 вес.ч. сульфата кали (содержание Кг504- 98%)Example. 89,16 weight.h. potassium sulfate (content Kr 504- 98%)

Claims

0 3. 83 is dissolved in 459.56 parts by weight. a working solution containing,%: 31.64 KNOg, 1.53 CaS04, 0.34, 66.49 Ndr, and 125.38 parts by weight were added. calcium nitrate solution containing 42.59 parts by weight of water. The conversion is carried out at a suspension pH of 3.5. The suspension is stirred for 50 minutes at a temperature of 80 ° C, after which it is filtered and the filter cake is washed with 138.32 parts by weight. hot water. Receive 509.64 weight.h. stock solution containing,%: KNOj 42.35, CaS04l, l9f 0.27; 56.18; 115.39 weight.h. about weld waters containing,%: KMO 16.77 CaSO 0.47} 0.06, and 118.62 parts by weight washed gypsum containing,%: CaSO. . 2Н About 72.95; KNOj 1.86; 0, NLO 25, 17 “The mother liquor is cooled down to and is 103.04 parts by weight. product content,%: KMO 96.8; Ndr 3.2 and 409.9 weight, h. solution. The resulting solution is combined with the washings, from the combined solution, 414.773 parts by weight of the solution is removed by evaporation. water and get 467,56 weight.h. working solution, which is returned to the stage of dissolution of potassium sulfate. After drying potassium nitrate, the finished product is obtained with a CMO3 content of 99.2%. The degree of potassium recovery in the product is 98%. If the filtered product. to penetrate, the content of the main product is 99.9%. . The invention method of producing potassium nitrate, which consists in the interaction of calcium nitrate and potassium sulfate in solution with the subsequent separation of the precipitate of calcium sulfate, the crystallization of potassium nitrate and the return of the mother liquor to the cycle, so that simplification of the method, the interaction is carried out at a pH of 1.5-5.5. Sources of information taken into account during the examination. USSR author's certificate 382595, cl. C 05 C B / 02, 1971.

2. German patent 974061, cl. 12 Z 6, 1960 (prototype).