MVR evaporative concentration and crystallization process for extracting lithium from salt lake brine

Abstract

The invention relates to a MVR evaporative concentration and crystallization process for extracting lithium from salt lake brine. The process comprises the following steps: preheating of a stock solution; MVR evaporative concentration and crystallization; and MVR vapor compression. The process employs MVR vapor recompression technology for evaporative concentration of the salt lake brine, and a small number of sodium chloride crystals are precipitated during evaporative concentration, so energy consumption and operation cost are lowered, the technical advancement of the process is improved, and the process overcomes the problem that conventional equipment only concentrates a lithium solution and is incapable of realizing precipitation of high-purity sodium chloride salt crystals in the process of multi-effect evaporation.

Description

technical field [0001] The invention relates to an MVR evaporation concentration and crystallization process for extracting lithium from salt lake brine, in particular to a process for concentrating salt lake brine by using the MVR evaporation concentration crystallization method to extract lithium. Background technique [0002] In recent years, the demand for basic lithium salts has maintained a rapid growth momentum in the fields of new energy vehicles, electric tools, electric bicycles, backup power supplies for communication base stations, and grid energy storage, especially in the field of new energy vehicles. increase. After several years of investment and construction, the development of domestic lithium ore resources, brine resources and lithium mica extraction technology will gradually form a scale. Lithium salt production enterprises will make full use of both domestic and foreign resources, and lithium salt production capacity will be gradually released. To meet ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is, aiming at the problems such as high energy consumption, high operation cost, and high secondary pollution unfavorable to the environment in the evaporation and concentration section of the current lithium extraction process from salt lake brine, several methods of evaporating and concentrating salt lake brine using MVR vapor recompression technology are proposed Process (a small amount of sodium chloride crystallizes out during evaporation and concentration), reduces energy consumption and operating costs, improves technological advancement, and avoids multi-effect evaporation process equipment that only undertakes the lithium solution concentration function, but cannot precipitate high-purity sodium chloride salt crystal problem

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