Method for extracting Mg, K, B and Li from mixed brine by utilizing natural energy

Abstract

The invention provides a method for extracting Mg, K, B and Li from mixed brine by utilizing natural energy. The method comprises the following steps: obtaining brine A through evaporating, freezing and evaporating carbonate brine until the Li content is smaller than or equal to 2.5g / L or the lithium carbonate content in precipitated solid ores is smaller than or equal to 0.5%; obtaining brine B through evaporating, freezing and evaporating sulfate brine until the Mg content is more than or equal to 10g / L; obtaining brine C after reaction between the brine A and the brine B; obtaining brine D after evaporating the brine C until the content of sulfate radicals is 5-40g / L; obtaining brine E after freezing the brine D to precipitate mirabilite; evaporating the brine E to precipitate sodium chloride and brine F; evaporating the brine F to precipitate sylvite ores and brine G; carrying out mixing and reaction on the brine G and high magnesium brine to obtain sylvite ores and brine H; mixing the brine H with mirabilite to react to obtain brine I; mixing the brine I with fresh water or sulfate original brine and evaporating the brine to precipitate boron ores and brine J; evaporating the brine J to obtain lithium ores and brine K; blending the brine K to recover Li and B.

Description

technical field [0001] The invention relates to a development and utilization process of salt lake brine, in particular to a method for extracting Mg, K, B and Li from mixed brine by using natural energy. Background technique [0002] According to the type of brine, the salt lakes in the world can be roughly divided into several categories: carbonate type, sulfate type, chloride type and nitrate type. [0003] The boron-rich lithium carbonate salt lake is a kind of resource with high value. Tibet, located on the Qinghai-Tibet Plateau, is one of the areas in the world where carbonate-type boron-rich lithium salt lakes are concentrated. Zabuye and Jiezechaka are typical representatives of them, which contain lithium, potassium, and boron resources. [0004] Existing carbonate-type boron-lithium-rich salt lakes, taking Tibet’s Jieze Chaka Salt Lake as an example, the natural evaporation (indoor) crystallization route of brine is: halite, potassium halite, potassium halite + li...

AI Technical Summary

Problems solved by technology

[0005] Specifically, (1) The precipitated potassium salt exists in the form of potassium halite, potassium mirabilite, potassium sulfate and other potassium mixed salts. It is difficult to process in the lake area. Even if it is processed with existing mature technology, the transportation distance is long and the economic benefit is low Difference

(2) Lithium salt is precipitated in the form of lithium carbonate, but it is too dispersed and must be re-enriched on site. Flotation requires a large amount of treatment, and it is difficult to increase the grade to more than 60%, and it still needs to be shipped out for processing

(3) For boron, the type of precipitated minerals is not yet clear, and the processing method is difficult to determine, but according to the transportation distance of the mining area, even if the precipitated boron ore B 2 o 3 If the content is more than 20%, it needs to be enriched again, and it is difficult to process

[0006] In addition, the environment in the plateau salt lake area is harsh. For example, Zabuye and Jiezechaka lakes are both at an altitude of about 4500m. The traffic is basically in a blank state; the products are far away from the market, and the same product, such as KCl, is highly profitable in Golmud, with a net profit of more than 1,000 yuan per ton, while in Tibet, even if the increase in price and cost under harsh conditions is not considered, plus It is unprofitable or even loss-making after transportation costs, so it will be very difficult to develop these salt lakes with current methods

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