Method and system for preparing lithium carbonate or concentrated brine rapidly by high-temperature steam

Abstract

The invention discloses a method and a system for preparing lithium carbonate or concentrated brine rapidly by high-temperature steam. The high-temperature steam is used for heating brine directly and a condenser is used for discharging the produced steam, so that the brine can be concentrated or lithium carbonate crystals can be prepared efficiently with byproduct fresh water. The method has the advantages that with the steam heating the brine, the method is of high heating speed and heating uniformity, so that heating devices such as a jacket or a heat exchange tube in equipment are decreased, and salt caking caused by overlarge temperature difference is avoided; while heating, the steam can play a role in stirring the brine, and accordingly the stirring device in the equipment is omitted; since the steam is condensed through a heat exchanger and the produced steam can be sucked out automatically, a vacuum pump is omitted and equipment complexity is lowered; heat released by steam condensation is recycled as much as possible to be used for preheating the brine and other media, and accordingly energy utilization ratio is high.

Description

technical field [0001] The invention relates to a method and system for rapidly preparing lithium carbonate or concentrated brine, in particular to a method and system for rapidly preparing carbonic acid or concentrated brine suitable for plateau areas. Background technique [0002] Lithium is the metal element with the smallest atomic weight. It has special properties such as the most negative potential, the largest electrochemical equivalent, high specific heat, high electrical conductivity, and strong chemical activity. It is ideal for manufacturing disposable batteries, rechargeable power batteries, and aerospace structural materials. metallic material. As the global demand for new energy to replace traditional ore sources (oil, coal, shale gas, etc.) is becoming more and more urgent, lithium batteries have played a pivotal and core role in new energy power generation, power transmission and transformation, and power storage. At the same time, the global lithium raw mat...

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Problems solved by technology

In the traditional method of separating magnesium and lithium, the ion adsorption method has high requirements on the adsorbent, difficult granulation, and poor permeability. In the process of adsorption and desorption, the adsorbent is easy to be lost, and the loss of lithium exceeds 50%. High operating temperature, high energy consumption, severe agglomeration, and serious equipment corrosion; the extraction and stripping process of the extraction method is long, the consumption of chemicals is large, the toxicity is high, and it is not friendly to the environment; therefore, despite China’s superior salt lake lithium resources , but the mature industrialized salt lake lithium extraction technology is still in a small-scale or stagnant state. In this context, the upstream and downstream industrial chains of lithium are severely restricted. skyrocketing pain

[0005] The traditional method of extracting lithium salt from salt lakes is mainly sun-dried salt method. This method is extremely dependent on climate, has a long crystallization cycle, is not high in grade and unstable, and cannot meet the needs of industrial production.

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