Method for comprehensively extracting lithium, potassium and boron from oilfield brine

Abstract

The invention discloses a method for comprehensively extracting lithium, potassium and boron from oilfield brine. The method includes the steps of conducting preprocessing, conducting evaporative crystallization to separate out sodium salt to obtain a sodium extraction mother solution, conducting evaporative crystallization on the sodium extraction mother solution to separate out sylvite to obtaina potassium extraction mother solution, conducting impurity removal on the potassium extraction mother solution through lime milk and mirabilite to obtain an impurity-removed potassium extraction mother solution, adding hydrochloric acid or sulfuric acid to the impurity-removed potassium extraction mother solution to obtain coarse boric acid and a coarse lithium-containing mother solution, conducting evaporative concentration on the coarse lithium-containing mother solution, conducting chelation or adsorption and purification impurity removal to obtain a refined lithium-rich mother solution,and adding alkali to the refined lithium-rich mother solution for depositing and washing to obtain coarse lithium carbonate. The salt pan technology and the chemical separation method are applied in the separation and extraction process of resources such as lithium, potassium and boron in the oilfield brine, the practical low-cost economic benefits and social value can be created, a new brine resource comprehensive utilization approach can be created, and the method has great significance in making up the shortage of resources such as lithium, potassium and boron in China.

Description

Technical field [0001] The invention relates to the technical field of development and comprehensive utilization of oil field brine resources. More specifically, it relates to a method for comprehensively extracting lithium potassium boron from oil field brine. Background technique [0002] In recent years, with the rapid development of new energy vehicles and information technology, the lithium industry has shown an unprecedented vigorous development trend, and the demand for lithium raw materials has continued to grow. Although my country is rich in lithium resources, the lithium resources that are easy to mine and can be efficiently used are still very limited. For now, the vast majority of my country's lithium production comes from the extraction of lithium from ore, and a few come from the extraction of lithium from brine. However, the existing lithium extraction technology from ore has disadvantages such as high energy consumption, serious pollution and high cost. However...

AI Technical Summary

Problems solved by technology

However, there are no successful precedents and process references for the comprehensive development and utilization of oilfield brine lithium, potassium, boron and other resources at home and abroad.

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