PROCÉDÉ DE PRODUCTION D'HYDROXYDE DE LITHIUM À PARTIR DE MINERAI DE LITHIUM PAR CHLORATION ET PAR UN PROCÉDÉ CHLORE-ALCALI

摘要

The invention relates to a method for producing lithium hydroxide (4), in particular high-purity lithium hydroxide, for use in batteries and/or accumulators, from lithium-containing ore and/or mineral, and/or lithium-containing earths (1) by means of a chloroalkali process, wherein a solution is to be provided for increasing the extraction rate of high-purity lithium hydroxide when using a chloroalkali process. This aim is achieved in that in a chlorination step (A) a lithium chloride solution (2) is produced, wherein initially, the lithium-containing ores and/or minerals and/or earths (1) are chlorinated using chlorine gas (5), and subsequently, are leached out, in particular with the use of water. In a subsequent purification step (B), a high-purity lithium chloride solution (3) is generated, wherein the lithium chloride solution (2) is purified, in particular by removing cations, such as sodium, potassium, calcium, magnesium, and/or iron, from the lithium chloride solution (2). In a subsequent electrolysis step (C), lithium hydroxide (4), in particular high-purity lithium hydroxide, is then produced, wherein the high-purity lithium chloride solution (3) is subjected to a membrane electrolysis generating chlorine gas (5) and hydrogen as by-products.