Method for enriching boron and lithium elements in sulfate type salt lake brine

Abstract

The invention relates to a method for enriching boron and lithium elements in sulfate type salt lake brine. The method comprises the following steps of: (1) introducing the sulfate type salt lake brine into a pre-sunning pool, and regulating the concentration of sodium ions to a saturation state of sodium chloride; (2) introducing the brine with the sodium chloride in the saturation state into a mirabilite pool, and freezing in winter to precipitate mirabilite; (3) evaporating the brine after the precipitation of the mirabilite in spring and summer to precipitate the sodium chloride; (4) performing potassium removal treatment on the brine after the precipitation of the sodium chloride; (5) introducing the brine after potassium removal into an epsomite pool, and precipitating epsomite to obtain the brine with high content of magnesium chloride; and (6) mixing the brine with high content of magnesium chloride with the mirabilite for reaction, and performing solid-liquid separation to obtain a solution which is rich in boron and lithium elements.

Description

technical field [0001] The invention relates to a development and utilization process of sulfate-type salt lake brine, in particular to a method for enriching boron and lithium elements from sulfate-type salt lake brine. Background technique [0002] There are a large number of salt lakes on the Qinghai-Tibet Plateau in my country. Among them, the salt lakes in the Qaidam area of ​​Qinghai, such as Chaerhan Salt Lake, Dachaidan Salt Lake, East-West Taijinel Salt Lake, Yiliping Salt Lake, Gasikule Salt Lake, etc., after decades of massive investment by the state, infrastructure such as roads, Railways, electricity, water resources and other conditions are relatively good, and have been developed or have the conditions for development. In the development of these salt lakes, people are persistently trying to realize the comprehensive utilization of potassium, lithium, boron, magnesium, sodium and other resources. Some technologies have achieved industrial trial production, an...

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Problems solved by technology

In the development of these salt lakes, people are persistently trying to realize the comprehensive utilization of potassium, lithium, boron, magnesium, sodium and other resources. Some technologies have achieved industrial trial production, and only potassium fertilizer, sodium salt, and magnesium have been achieved in large-scale industrial production. The production of salt series products has begun to take shape, but the production of boron and lithium is still difficult

[0003] The development conditions of salt lakes in Tibet are extremely harsh. Except for the partial development of salt lake solid boron ore and Zabuye carbonate-type brine lithium mines, there have been no successful examples of comprehensive brine development. The main reasons are: high altitude, Tibet salt lake Generally, the altitude is in the range of 4000-5000m, and the highest is over 5000m. The natural environment is extremely harsh, the ecological environment is very fragile, and the environmental protection requirements are high; the traffic is inconvenient, and the traffic conditions of the salt lake in Tibet are extremely poor, far away from the national road, and the best conditions are only sand and stone It is accessible by road and is far away from the product market consumption area. The shortest transportation distance is 2000km, most of which are more than 3000km; the infrastructure is basically blank, far away from the power grid, and there is no condition for building a large-scale chemical plant. Auxiliary facilities used

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