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Process for producing lithium hydroxide monohydrate by using salt lake ore

A technology of lithium hydroxide monohydrate and lithium hydroxide, which is applied in the direction of lithium oxide; , reduce the effect of circulation

Pending Publication Date: 2021-03-12
CENT SOUTH UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

Salt Lake Ore Li 2 SO 4 ·H 2 The O content reaches 80.1-92.1%, with an average content of 85.1%. In the prior art, lithium products produced from salt lake ore are generally only industrial-grade, and there are many economic constraints in the production of battery-grade products from this route.

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  • Process for producing lithium hydroxide monohydrate by using salt lake ore

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0025] Such as figure 1 Shown, a kind of technique of producing lithium hydroxide monohydrate with salt lake ore, comprises the following steps:

[0026] S1, mixing water with salt lake ore, wherein, Li 2 The concentration of O is 30-45g / L. The mixed liquid is purified with lithium hydroxide mother liquor or calcium oxide, and the pH value is adjusted to 9-12. When purifying, if lithium hydroxide mother liquor is added, lithium hydroxide The concentration of mother liquor is 10% to 50%. Using lithium hydroxide mother liquor as purification can greatly reduce the introduction of calcium ions, reduce the content of calcium ions in the product and improve the quality of lithium hydroxide products. If calcium oxide is added Calcium oxide is a powder with a mass fraction greater...

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Abstract

The invention relates to the technical field of lithium hydroxide production, in particular to a process for producing lithium hydroxide monohydrate by using salt lake ore, which comprises the following steps of mixing the salt lake ore with water for size mixing, purifying to remove impurities, causticizing to remove impurities, freezing to remove sodium sulfate, evaporating and concentrating, drying and the like to finally obtain lithium hydroxide. The process for producing the lithium hydroxide monohydrate by using the salt lake ore has the advantages that the salt lake ore is used as a rawmaterial, the content of Li2SO4.H2O in the salt lake ore reaches 80.1-92.1%, the average content is 85.1%, the process uses the salt lake ore to produce the lithium hydroxide monohydrate, the problemof insufficient lithium ore resources is solved, and the risk of insufficient resources of a production line is increased; meanwhile, the equipment cost is saved; no spodumene is used in the process,consumption of spodumene is reduced, meanwhile, the process is simplified, and energy consumption and production equipment investment are reduced.

Description

technical field [0001] The invention relates to the technical field of lithium hydroxide production, in particular to a process for producing lithium hydroxide monohydrate from salt lake ore. Background technique [0002] Lithium hydroxide is widely used in chemical raw materials, metallurgy, battery industry, ceramics, national defense, atomic energy, aerospace and other industries. In the battery industry, it is used as an additive for alkaline storage batteries, which can prolong its life and increase storage capacity. At present, the main method of producing lithium hydroxide monohydrate is to use spodumene as raw material, undergo high-temperature calcination transformation, cooling, ball milling, acidification roasting, cooling, pulping, leaching and pressing separation, freezing and separation of sodium sulfate, evaporation, low-temperature recrystallization, etc. process steps. [0003] However, spodumene resources are insufficient, and it is urgent to find new mine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02
CPCC01D15/02C01P2006/80
Inventor 汪梨超李荐何开茂何东利伍震洲代道和杨贤丽江莹黄剑新谭培渊
Owner CENT SOUTH UNIV
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