Method for producing lithium hydroxide from lithium-containing ore
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A technology of lithium hydroxide and ore, which is applied in the direction of lithium oxide;/hydroxide, lithium halide, hydrogen chloride preparation, etc., can solve the problems of low economy and achieve the effect of improving economy
Inactive Publication Date: 2019-11-22
SMS GRP GMBH
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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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[0023] The drawing shows a process flow diagram of an exemplary process according to the invention for producing lithium hydroxide from lithium-containing ores and / or minerals and / or lithium-containing soils (1). According to this embodiment, lithium-containing mineral or soil (1) spodumene (LiAl[Si 2 o 6 ]) is used as a primary product for the preparation of lithium hydroxide (4) to obtain lithium hydroxide as the final product of the preparation process according to the invention for further use in battery applications, especially for rechargeable lithium-ion batteries. In particular, highly pure lithium hydroxide can be obtained with the aid of the production process according to the invention, whose total content of interfering impurity cations, such as calcium and magnesium, is below 150 ppb (parts per billion). Spodumene is present in lithium-containing ores (1), especially lepidolite. The preparation of lithium-containing ores and / or minerals (1) for further processin...
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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...
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