Clean production process of plateau sulfate type boron-lithium salt lake brine

Abstract

The invention relates to a clean production process of plateau sulfate type boron-lithium salt lake brine. The process comprises the following steps of: (1) arranging a pre-airing pond, a mirabilite pond, a NaCl pond, a carnallite pond, an epsom salt pond I, a magnesium removing pond, an epsom salt pond II, a boron pond, a lithium pond and an old brine pond; (2) controlling the sodium ion concentration in plateau sulfate type boron-lithium salt lake brine, precipitating mirabilite out in winter to obtain brine A, naturally evaporating the brine A, and salting out to obtain brine B; (3) naturally evaporating the brine B, and precipitating sylvine and carnallite out in sequence to obtain brine C; (4) naturally evaporating the brine C, precipitating an epsom salt out, and performing solid-liquid separation to obtain brine D and a solid A; (5) blending the brine D with mirabilite, removing magnesium to obtain brine E, and naturally evaporating brine E to obtain brine F and a solid B; (6) performing a hydration reaction on brine F, naturally evaporating, and precipitating reservoir water/inderite and brine G out; and (7) evaporating brine G or refrigerating for precipitating lithium sulfate, and processing the lithium sulfate into a corresponding product. The process has the advantages of comprehensive utilization of natural energy, saving in energy and environment friendliness.

Description

technical field [0001] The invention relates to the technical field of development and utilization of brine, in particular to a clean production process for plateau sulfate-type boron-lithium salt lake brine. Background technique [0002] There are a large number of boron-rich lithium salt lakes on the Qinghai-Tibet Plateau, and the salt lakes in the Qaidam area of ​​Qinghai, such as Chaerhan Salt Lake, Dachaidan Salt Lake, Dongxitaijinel Salt Lake, Yiliping Salt Lake, Gasikule Salt Lake, etc., pass through dozens of countries. The infrastructure such as roads, railways, electricity, water resources and other conditions are relatively good, and have been developed or have the conditions for development. Among them, Chaerhan Salt Lake has become the largest salt lake potash fertilizer production base in my country. In the development of these salt lakes, people are unremittingly trying to realize the comprehensive utilization of potassium, lithium, boron, magnesium, sodium and...

AI Technical Summary

Problems solved by technology

[0004] 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 4000-5000 m, and the highest one is above 5000 m. The natural environment is extremely harsh, the ecological environment is very fragile, and the environmental protection requirements are high; the traffic is inconvenient: the traffic conditions of the salt lake in Tibet are extremely poor, far away from the national road, and the best conditions are only The gravel road can be reached, and it is far away from the product market consumption area. The shortest transportation distance is 2000 km, most of which are more than 3000 km; the infrastructure is basically blank: far away from the power grid, there is no condition for building a large-scale chemical plant, and there is no chemical industry for hundreds of kilometers Enterprises and Auxiliary Facilities Available

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