A kind of method for comprehensively extracting lithium potassium boron from oil field brine

Abstract

The invention discloses a method for comprehensively extracting lithium, potassium and boron from oil field brine. The process flow includes: pretreatment, evaporation and crystallization of sodium salt to obtain sodium extraction mother liquor, and sodium extraction mother liquor through evaporation and crystallization to precipitate potassium salt to obtain potassium extraction mother liquor 1. The potassium extracting mother liquor is removed by lime milk and Glauber's salt to obtain the potassium extracting mother liquor after the impurity removal, and hydrochloric acid or sulfuric acid is added to the potassium extracting mother liquor after the impurity removal to obtain crude boric acid and the crude lithium-containing mother liquor, and the crude lithium-containing mother liquor is evaporated and concentrated. Chelation or adsorption purification to remove impurities to obtain refined lithium-rich mother liquor, and adding alkali to precipitate and wash the refined lithium-rich mother liquor to obtain crude lithium carbonate. The present invention applies salt field technology and chemical separation method to the separation and extraction process of lithium, potassium, boron and other resources in oil field brine, which can not only create practical low-cost economic benefits and social value, but also open up a new comprehensive brine resource Utilization methods are of great significance for making up for the shortage of lithium, potassium, boron and other resources in my country.

Description

technical field [0001] The invention relates to the technical field of oilfield brine resource development and comprehensive utilization. More specifically, it relates to a method for comprehensively extracting lithium, potassium and boron from oilfield 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 booming 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 utilized are still very limited. For now, the vast majority of lithium production in my country comes from lithium extraction from ores, and a small amount comes from lithium extraction from brine. However, the existing ore lithium extraction technology has disadvantages such as high energy consumption, serious pollution, and high cost, while the technica...

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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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