Method for separating lithium from salt lake raw bittern

Abstract

The invention discloses a method for separating lithium from a salt lake raw bittern. The method comprises the following steps of taking salt lake raw brine as a raw material, contacting the raw material with an adsorption material filled in an adsorption column, and realizing separation of lithium and magnesium, potassium and sodium in the raw brine by an adsorbing process, a liquid ejecting process and a resolving process, and the yield of lithium in the brine is 70%-85%; and obtaining a lithium salt solution by controlling adsorption, liquid ejection and resolving of the feeding flow rate.According to the method, the existing lithium separation process route is shortened, the process of building a large-area salt pan or extracting potassium is avoided, and the loss of lithium in the salt pan beach drying process is reduced, the raw bittern is directly used as a raw material, adsorption materials are used as a basis, simple and practical new process routes of adsorption, liquid ejection and resolving are adopted, lithium separation is achieved in one step, the yield of lithium in the raw bittern is increased to 70%-85% from original 30%-35%, the utilization rate of resources isincreased, and the method is simple and easy to operate and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of development and application of lithium battery new energy raw materials, and in particular relates to a method for separating lithium from raw brine in a salt lake. Background technique [0002] Lithium and its compounds are widely used in electronics, metallurgy, chemical industry, medicine, energy and many other fields due to their excellent performance, and play a very important role in national economy and national defense construction. Especially in recent years, lithium has been widely used as battery positive electrode and ternary material, which has driven the vigorous development of the international lithium market. It has been given the reputation of "metal monosodium glutamate". Become the main direction of attack, the focus and focus of everyone's attention and development. At present, there are mainly two types of proven terrestrial lithium resources: ore-type lithium resources and salt lake...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for separating lithium from the original brine brine of salt lakes in view of the deficiencies in the above-mentioned prior art, and select an adsorption material with strong anti-interference ability of potassium, sodium, magnesium and other ions and good lithium selectivity , and then use this separation material to explore a new process to realize the process of direct separation of lithium from the original brine from sodium, potassium, magnesium, boron and other ions, and solve the problem in the prior art that due to pretreatment of concentrated brine in the salt field drying process Influenced by uncontrollable factors such as entrainment and leakage in the process, the yield of lithium is low, the concentration of brine is affected by the natural environment, the content of impurities such as magnesium, potassium, boron, and sodium in the original brine is high, and the separation of lithium from magnesium, sodium, and potassium A series of engineering problems and high production and processing costs brought about by the difficulty of impurities