SU569537A1

SU569537A1 - Method of obtaining sodium chloride

Info

Publication number: SU569537A1
Application number: SU7402066063A
Authority: SU
Inventors: Валерий Цальевич Гонионский; Василий Иванович Левераш; Семен Ицкович Голуб; Николай Максимович Борисоник; Федор Иванович Малофеев; Петр Гаврилович Яценко
Original assignee: Предприятие П/Я А-1297; Славянский Солевыварочный Комбинат
Priority date: 1974-10-09
Filing date: 1974-10-09
Publication date: 1977-08-25

Description

(54) СПОСОБ ПОЛУЧЕНИЯ ПОВАРЕННОЙ СОЛИ(54) METHOD FOR PRODUCING COOKED SALT

1one

Иэобр - тени€ относитс к способу получени поваренной соли, широко прммен емрго в производстве пииевой выварочной соли copra Экстра.Ieobr - shade refers to the method of obtaining table salt, which is widely used in the production of copra evaporated boiled salt. Extra.

Иовостпый способ получени поваренной соли заключаетс в подземном растворении соли, соловой очистке рассола с целью уда лен уг из рассолов накипеобразующих солей кальци и магни , его упарке, в процессе которого происходит кристаллизаци пова{тенной соли, отделении поваренной соли, центрифугировании и сбросе части маточног раствора с целью вывода из системы сульфат-ионов 13 ,2}. Однако при сбросе части маточного раствора происходит засоление водоемов и почвенных вод.The ground-breaking method of salt production consists in the underground salt dissolution, salt brine purification in order to remove the angle from brines of calcium and magnesium scale-forming salts, its evaporation, during which crystallization of the salted salt occurs, separation of the salt, centrifugation and discharge of a part of the mother liquor with the aim of withdrawal from the system of sulfate ions 13, 2}. However, when part of the mother liquor is discharged, salinization of water bodies and soil waters occurs.

Известен также способ получени пова1; ) соли из рассолов, содержащих сульфат натри , включающий упаривание рассола , сгушетше пульпы и отделение продукта от раствора, путем упаривани раствора до содержани в нем сульфат-иона 50 г/л и сбросе маточного раствора зЗ.There is also known a method for producing powder; ) salts from brines containing sodium sulfate, including evaporation of brine, pulp drying and separation of the product from the solution, by evaporation of the solution to contain a sulfate ion in it of 50 g / l and discharging the mother liquor of the black powder.

Недостатком этого способа вл етс загр знение получаемой поваренной солиThe disadvantage of this method is contamination of the obtained table salt.

как за счет высокого содержани сульфатионов в маточном растворе, так и вследствие кристаллизации сульфата натри в процессе выпаривани , К тому же при существуюи;ем способе получени поваренной соли приходитс сбрасывать до 25% копичестЬа рассола, что приводит к засолению рек и водоемов .both due to the high content of sulfations in the mother liquor, and due to the crystallization of sodium sulfate in the evaporation process, moreover, the existing method of salt production has to drop up to 25% of the brine, which leads to salinization of rivers and reservoirs.

С целью повышени выхода продукта и сокращени сточных вод следует вести упаривание рассола до концентрации в ней сульфата натри 55-120 г/л.In order to increase product yield and reduce wastewater, brine should be evaporated to a sodium sulfate concentration of 55-120 g / l.

Целесообразно полученную поваренную соль промывают исходным рассолом в восход щем потоке со скоростью 20-1ОО м/час.It is advisable that the obtained table salt is washed with the initial brine in an upward flow at a speed of 20-1OO m / h.

При этом количество сбрасываемого раствора уменьшаетс более чем R 2,4 раза.At the same time, the amount of the discharged solution decreases by more than R 2.4 times.

Предложенный способ осуществл ют по следующей технологической схеме.The proposed method is carried out according to the following flow chart.

Claims

The brine together with part of the mother liquor from the tank is pumped to the evaporation battery for evaporation, where the evaporation is carried out to a concentration of sodium sulfate in brine 55-120 g / l. The resulting slurry of salified salt is concentrated to 50% by weight in solid phase in a thickener and then pumped to a sump for washing sodium chloride from sodium sulfate. The salt is washed with the initial brine in the upstream, and the brine consumption is selected so that the speed of the upstream solution at the brine inlet is 20-100 m / h. The partial dissolution of sodium sulfate crystals contained in one stripped off brine, as well as the removal of cyflib crystals (sodium jiaTa from the washing zone in the upstream, because their average {3-4 times less than that of boiling crystals). , the initial brine supplied to the settling tank from below prevents penetration of the evaporated solution into the pulp discharged from the settling tank, to remove the sodium sulphate from the system, the part of the solution drained from the settling tank is discarded. The bodies are mixed in the tank with the initial brine, and then it is fed again to the evaporation. The pulp of the washed table salt is sent to the centrifugation. After centrifuging and drying, the washed salt meets the requirements of GOST 13830-68 for extra grade salt. A method for producing salt from brines containing sodium sulfate, including evaporation of brine, thickening of the pulp and separation of the product from the solution, characterized in that, in order to increase the yield of the product and reduce wastewater, evaporation leads to and sulfate 55-120 g / l, 2. The method according to claim 1, wherein after separating the product from the solution, it is washed in an upward flow of the original brine supplied with skorhesti 20 -100 m / h. Sources of information taken into account in the examination: 1. Evaporated sleep and its solutions. Handbook. M., Himi, 1970. p. 87, tabl.101,

2. Furman A. L ,, Shraybman S. S. Preparation and cleaning of brine. M., Himi, 1960, p. 24

3. USSR author's certificate number 322311, cl. C 01 D 3 / O4. 02.08.69.