Lithium Hydroxide Recovery Technology from Solution by Bipolar Membrane Method

A technology of lithium hydroxide and bipolar membranes, applied in electrolysis process, electrolysis components, etc., can solve the problems of long production process, high operation cost, environmental pollution, etc., reduce production operation cost, reduce production cost, no secondary The effect of secondary pollution

Active Publication Date: 2017-10-03
HANGZHOU BLUETEC ENVIRONMENTAL TECH
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Problems solved by technology

[0003] In the lithium industrial production process, it is necessary to concentrate lithium sulfate to more than 12%, then add sodium hydroxide, and then undergo crystallization and purification to make lithium hydroxide. The production process is relatively long, which has certain pollution to the environment and high operating costs. economy

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  • Lithium Hydroxide Recovery Technology from Solution by Bipolar Membrane Method

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Embodiment Construction

[0023] Lithium sulfate solution is mainly derived from the by-products produced in the production of lithium iron sulfate batteries, with a concentration ranging from 5-20%. Mainly contains lithium sulfate and some Fe 3+ , enter the system for processing.

[0024] With reference to the accompanying drawings, the lithium sulfate solution entering the process of the present invention is first processed in step (1): the lithium sulfate solution is treated with an ultrafiltration system and ion exchange, mainly to remove divalent and more than divalent metal ions; after pretreatment Finally, the parameters of the purified lithium sulfate solution are as follows: control iron ions below 1mg / l, calcium and magnesium ions below 1mg / l, COD below 5mg / l, bicarbonate below 20mg / l, silicon dioxide If it is lower than 5mg / l, the concentration of lithium sulfate is 5-20% (mass percentage), the water produced in the pretreatment system enters the treatment of step (2), and the concentrated ...

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Abstract

The invention provides a bipolar membrane method for recovering lithium hydroxide from a solution. The lithium sulfate solution is treated with a bipolar membrane system, and the produced water after the bipolar membrane system treatment is lithium hydroxide and sulfuric acid. The invention not only solves the problem of environmental protection, but also reduces the consumption of alkali and acid, realizes clean production, saves energy and reduces emissions, and reduces operating costs.

Description

technical field [0001] The invention relates to a technology for recovering lithium hydroxide from a solution by a bipolar membrane method. Background technique [0002] Lithium hydroxide is a white monoclinic fine crystal, with a spicy taste and strong alkalinity. It can absorb carbon dioxide and water in the air. It is soluble in water, slightly soluble in ethanol, and insoluble in ether. The pH of 1mol / L solution is about 14, the relative density is 1.51, the melting point is 471°C (anhydrous), and the boiling point is 925°C (decomposition). , corrosive. Lithium hydroxide can be used as a developing agent for spectral analysis, lubricating oil, and an additive for alkaline battery electrolytes, which can increase the capacitance by 12% to 15%, and increase the service life by 2 to 3 times. [0003] In the lithium industrial production process, it is necessary to concentrate lithium sulfate to more than 12%, then add sodium hydroxide, and then undergo crystallization and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/20
Inventor 黄伟平楼永通李嘉陈良
Owner HANGZHOU BLUETEC ENVIRONMENTAL TECH
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