Method of simply, easily and efficiently lowering content of magnesium in salt lake brine

Abstract

The invention discloses a method of simply, easily and efficiently lowering the content of magnesium in salt lake brine. The method comprises the following steps of adding excessive water-soluble hydroxide in the salt lake brine, and uniformly stirring, wherein the molar weight of introduced hydroxy radicals is at least 1.5 times of theoretical amount for completely precipitating Mg<2+>; standing for precipitation, and carrying out solid-liquid separation, wherein a filtrate is brine with low magnesium content. The method provided by the invention is simple in treatment technology and convenient to operate and can be implemented in the salt lake field, so that the transportation cost is greatly lowered. By adopting the method, excessive xenobiotics cannot be introduced in a salt lake region, and magnesium hydroxide as a by-product is also a resource with a great value and is environment-friendly; and the magnesium removal efficiency is high, the lithium loss is low, the filtrate after solid-liquid separation can be directly used for preparing lithium carbonate and is particularly suitable for batch magnesium-lithium separation of plateau salt lakes in a large scale.

Description

technical field [0001] The invention relates to a method for reducing magnesium content in salt lake brine, in particular to a method for reducing magnesium content in lithium-containing salt lake brine. 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 material - lithium carbonate is in short supply, caus...

AI Technical Summary

Problems solved by technology

The use of these additives certainly helps to improve the Mg(OH) 2 However, its technological process is relatively complicated, and it uses a wide variety of chemical drugs, which are not friendly to the environment, and it is very easy to damage the extremely fragile ecological environment in the plateau salt lake area, making it difficult to implement large-scale applications.

The extensive use of additives also increases the transportation burden, and the production cost will remain high

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