首页>
外国专利>
METHOD FOR OBTAINING CONCENTRATED BRINE OF MINIMUM IMPURITY CONTENT FROM BRINE FOUND IN NATURAL SALT FLATS AND SALT MARSHES, SAID METHOD HAVING MINIMUM ENVIRONMENTAL IMPACT AND MAXIMUM LITHIUM RECOVERY
METHOD FOR OBTAINING CONCENTRATED BRINE OF MINIMUM IMPURITY CONTENT FROM BRINE FOUND IN NATURAL SALT FLATS AND SALT MARSHES, SAID METHOD HAVING MINIMUM ENVIRONMENTAL IMPACT AND MAXIMUM LITHIUM RECOVERY
The invention relates to a method for obtaining concentrated brine of minimum impurity content from brine found in natural salt flats and salt marshes, said method having minimum environmental impact and maximum lithium recovery. The method is characterised in that it comprises the steps of: a) constructing ponds for fractional crystallisation based on solar evaporation; b) filling the ponds with natural brine; c) initially pre-concentrating the natural brine until the maximum possible lithium concentration in the liquid phase is obtained, without lithium-containing salts being precipitated; d) cooling the pre-concentrated brine obtained in step (c), ensuring the maximum precipitation of salts containing sulphate anion; e) chemically pre-treating the liquid phase of the brine separated from the salts precipitated by means of cooling in order to minimise sulphate anions in the liquid phase after cooling; f) finally pre-concentrating the pre-treated liquid phase until the maximum possible lithium concentration in the liquid phase is obtained, without lithium-containing salts being precipitated; g) chemically treating the liquid phase of the brine separated from the salts precipitated in step (f) in order to minimise the concentration of magnesium, calcium, boron and sulphate in the liquid phase; and h) concentrating the liquid phase obtained in step (g).
展开▼
