FIELD: purification of sodium chloride. SUBSTANCE: sodium chloride solution is treated with soda-alkaline solution and precipitant is separated and dissolved with hydrochloric acid. Soda-alkaline solution is produced by carbonization of electrolytic alkali with carbon dioxide liberated during dissolving of precipitant with hydrochloric acid, with addition of soda ash to obtain sodium carbonate-to-calcium ions molar ratio of (1.01-1.05):1 and sodium hydroxide-to-magnesium ions molar ratio of (2.02-2.10):1. Sulfate ions are separated at evaporation step of electrolytic alkali of the given production process in form of sulfate brine used for regeneration of cation exchangers. EFFECT: higher efficiency.
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING INDUSTRIAL BRINE | 2011 |
|
RU2477256C2 |
| METHOD OF SULPHATE-ION ABSORPTION IN METAL CHLORIDE AQUEOUS SOLUTIONS | 2006 |
|
RU2334678C2 |
| METHOD OF COMPLEX PURIFICATION OF AQUEOUS SOLUTIONS OF METAL CHLORIDES FROM IRON AND SULPHATE ION IMPURITIES | 2008 |
|
RU2373140C1 |
| METHOD OF PRODUCING BRINE FOR ELECTROLYSIS | 2007 |
|
RU2347746C2 |
| METHOD FOR COMPLEX TREATMENT OF CALCIUM CHLORIDE AND MAGNESIUM CHLORIDE TYPE BRINES (VERSIONS) | 2009 |
|
RU2436732C2 |
| METHOD OF OBTAINING LITHIUM CONCENTRATE FROM LITHIUM-BEARING NATURAL BRINES AND PROCESSING THEREOF INTO LITHIUM CHLORIDE OR LITHIUM CARBONATE | 2017 |
|
RU2659968C1 |
| METHOD OF PRODUCTION OF THE CHEMICALLY DEPOSITED CHALK | 2006 |
|
RU2312065C1 |
| METHOD FOR PURIFYING SODIUM CHLORIDE SOLUTION | 0 |
|
SU994407A1 |
| METHOD OF PRODUCING ULTRAPURE LITHIUM CARBONATE FROM TECHNICAL-GRADE LITHIUM CARBONATE AND APPARATUS THEREFOR | 2013 |
|
RU2564806C2 |
| METHOD OF PREPARING ANTI-ICING COMPOSITION | 2006 |
|
RU2313553C1 |
