Physical method and system for concentrating brine and removing salts

Abstract

The invention discloses a physical method and system for concentrating a brine and removing salts. The method comprises the following steps: raising the temperature of the brine to enhance the air convection on the surface, and accelerating evaporation to a near saturation or saturation state of the salts, so as to obtain a preliminarily-concentrated brine; cooling the preliminarily-concentrated brine to make the salts in the brine precipitated, performing solid-liquid separation, and collecting the remaining brine; repeating the above two steps for the remaining brine to further concentrate the brine and separate the precipitated salts, and stopping concentration when production requirements are achieved. The method provided by the invention is a purely physical method, and can remove 90%or more of impurity ions such as Mg, Na and K in the brine in a quick, effective and low-energy-consumption manner during the implementation without adding additional chemical reagents, the lithium ion concentration is rapidly improved by about 10 times, the mass loss is controlled within 10%, and the method can be used for magnesium removal treatment of a brine in each lithium salt lake, especially the magnesium removal treatment of a brine with a high ratio of magnesium to lithium.

Description

technical field [0001] The invention relates to a physical method and system for concentrating brine and removing salt, in particular to a physical method and system for concentrating brine and removing magnesium. Background technique [0002] Lithium is a metal element with a wide range of uses. With the development of new energy vehicles, especially the development of electric vehicles, the demand for lithium is increasing. Existing lithium is mainly extracted from salt lakes. Magnesium is the eighth most abundant element in the earth's crust, accounting for about 2% of the mass. Therefore, a relatively large amount of magnesium is generally contained in salt lake brine. The presence of magnesium makes it difficult to effectively separate and purify the brine, resulting in the need for magnesium removal treatment when extracting the required salt from the brine. However, salt lakes are generally located in remote areas with weak infrastructure and inconvenient transporta...

AI Technical Summary

Problems solved by technology

Heating dry air and using hot dry air can effectively prevent the water surface temperature from dropping too quickly and increase the evaporation temperature of lake water or brine, but the heat exchange between hot air and water is not sufficient, resulting in a very large heat loss. Calculated expression Its heat loss exceeds 80%, and a large amount of heat is wasted

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