Method of preparing lithium borate ores from mixed brine by utilizing natural energy

Abstract

The invention discloses a method of preparing lithium borate ores from mixed brine by utilizing natural energy. The method comprises the following steps: evaporating, freezing and evaporating carbonate brine until Li content is less than or equal to 2.5g / L or content of lithium carbonate in solid ores separated out in the brine is less than or equal to 0.5% to obtain brine A; collecting an alkaline mixture generated in the freezing process; evaporating, freezing and evaporating sulfate brine until Mg content is greater than or equal to 10g / L to obtain brine B; mixing and reacting the brine A and the brine B to obtain brine C; evaporating the brine C until sulfate radical content is 5g / L-40g / L to obtain brine D; freezing and nitrifying the brine D to obtain brine E; evaporating the brine E to a certain degree to obtain brine F; naturally evaporating the brine F to separate out sylvine ores and brine G; mixing and reacting the brine G and high-magnesium brine to obtain brine H; reacting the brine H with mirabilite to obtain brine I; evaporating the brine I to concentrate and separate out lithium sulfate ores and brine J; mixing and evaporating the brine J with fresh water or sulfate type original brine to separate out boron ores.

Description

technical field [0001] The invention relates to a development and utilization process of salt lake brine, in particular to a method for preparing lithium carbonate salt ore from mixed brine by using natural energy. Background technique [0002] Lithium, known as the "energy upstart" in the 21st century, is the lightest and most active metal element in nature, and it is a new energy raw material. Lithium resources in nature mainly exist in granite pegmatite deposits, salt lake brine, sea water and geothermal water. [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] In the existing carbonate-type boron-rich lithium salt lakes, taking the Jiezechaka Salt Lake in Tibet as ...

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Problems solved by technology

The third is the negative effect of flotation. The use of flotation agents, on the one hand, changes the surface properties of lithium carbonate and other minerals, which brings unpredictable difficulties to subsequent processing; on the other hand, the flotation agents are gradually enriched in the lake area. The impact of environmental protection problems on ecologically extremely fragile areas needs long-term investigation

[0005] 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, it is only one year. The increase in transportation costs will greatly reduce the profit of the product or even turn it into a loss. Therefore, it will be very difficult to develop these salt lakes with the existing methods.

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