Method for producing lithium hydroxide from lithium-containing ore

Abstract

The invention relates to a method for producing lithium hydroxide (4), in particular highly pure lithium hydroxide, for use in batteries and / or accumulators, from lithium-containing ore and / or mineraland / or from lithium-containing earths (1) by means of a chlor-alkali process. The aim of the invention is to create a solution which, in the case of such a method, increases the extraction rate of highly pure lithium hydroxide in the application of a chlor-alkali process. This aim is achieved in that, in a calcining and leaching step (A), a lithium chloride solution (2) is produced, the lithium-containing ores and / or minerals and / or earths (1) first being roasted, one or more metal chlorides (5) and / or a mixture of metal chlorides (5) being used, and then leached out, water being used, then ahighly pure lithium chloride solution (3) being produced in a subsequent purification step (B), the lithium chloride solution (2) being purified in particular by removing cations, such as sodium, potassium, calcium, magnesium, and / or iron, from the lithium chloride solution (2), and then lithium hydroxide (4), in particular highly pure lithium hydroxide, being produced in a subsequent electrolysis step (C), the highly pure lithium chloride solution (3) being subjected to a membrane electrolysis process, which produces chlorine gas and hydrogen as byproducts.

Description

technical field [0001] The invention relates to a method for preparing lithium hydroxide, especially high-purity lithium hydroxide, for use in batteries and / or energy stores from lithium-containing ores and / or minerals and / or lithium-containing soils method. Background technique [0002] An increase in global demand for light metal lithium can be noted in recent years. Lithium, for example in the form of lithium hydroxide and lithium carbonate, is used in particular for battery applications due to its electrochemical properties, especially for rechargeable batteries and / or energy stores, so-called lithium-ion batteries. They find particular application in portable electrical equipment, such as mobile phones, notebook computers, and the like. Likewise, in the automotive industry, lithium-ion batteries are becoming increasingly important as an alternative or supplement to internal combustion engines in electric and hybrid vehicles. Therefore, for the future, it can be expec...

AI Technical Summary

Problems solved by technology

Higher lithium yields can be achieved with longer process times and increased process temperatures, however this leads to lower economics of the process route

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