Method for preparing sylvite ore from mixed brine by use of natural energy

Abstract

The invention discloses a method for preparing sylvite ore from mixed brine by use of natural energy, which comprises the following steps: treating the carbonate type salt lake brine to obtain brine A, wherein Li in the brine A is not greatly precipitated in a form of lithium carbonate, or the Li content is less than or equal to 2.5g / L; treating the sulfate type salt lake brine to obtain brine B, wherein the Mg content in the brine B is greater than or equal to 10g / L; mixing the brine A and brine B for reaction, and performing solid-liquid separation to obtain brine C; naturally evaporating the brine C, and performing solid-liquid separation to obtain brine D; performing freezing treatment on the brine D, and performing solid-liquid separation to obtain brine E; naturally evaporating the brine E, and performing solid-liquid separation to obtain brine F; and naturally evaporating the brine F to precipitate sylvite.

Description

technical field [0001] The invention relates to a development and utilization process of plateau salt lake brine, in particular to a method for preparing potash rock salt ore from mixed brine by using natural energy. Background technique [0002] There are more than a thousand salt lakes of different sizes in my country, mainly distributed in the Qinghai-Tibet Plateau in the southwest of China, the Inner Mongolia Plateau in the north and the Xinjiang region in the northwest. 98% of my country's potassium reserves are produced in salt lakes. However, my country is a potassium-poor country. Therefore, the research and development of salt lake potassium salts has become one of the important scientific programs of the country. [0003] 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. The boron-rich lithium carbonate salt lake is a kind of resource with high v...

AI Technical Summary

Problems solved by technology

[0004] In addition, the environment in the plateau salt lake area is harsh. For example, Zabuye Lake and Jiezechaka Lake are both at an altitude of about 4500m. The transportation is basically in a blank state; the products are far away from the market, for example, the same product is highly profitable in Golmud, while in Tibet, even if the increase in price and cost under harsh conditions is not considered, the increase in transportation costs will greatly reduce the profit of the product or even will become loss-making, so it will be very difficult to develop these salt lakes with current methods