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Method for preparing lithium hydroxide monohydrate from spodumene sulfuric acid leaching solution

A technology of lithium hydroxide monohydrate and leaching solution, which is applied to the improvement of process efficiency, diaphragms, cells, etc., can solve the problems of low utilization rate of lithium ore resources, inability to meet low-carbon environmental protection, waste of water resources, etc., to meet the requirements, The effect of reducing production costs, saving resources and energy

Active Publication Date: 2020-06-05
杭州科锐环境能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is currently the main method for preparing lithium hydroxide monohydrate, but this method needs to consume a lot of energy in the process of low-temperature cooling and crystallization. In addition, the obtained lithium hydroxide monohydrate needs to undergo multiple crystallizations to obtain monohydrate with high purity. Lithium hydroxide, and this method will produce a large amount of waste salt, waste more water resources, and the utilization rate of lithium ore resources is low, which cannot meet the requirements of the era of low-carbon environmental protection and green economic development

Method used

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  • Method for preparing lithium hydroxide monohydrate from spodumene sulfuric acid leaching solution
  • Method for preparing lithium hydroxide monohydrate from spodumene sulfuric acid leaching solution
  • Method for preparing lithium hydroxide monohydrate from spodumene sulfuric acid leaching solution

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Embodiment 1

[0071] (1) After the spodumene is sulphated, roasted and leached, a lithium sulfate leaching solution with a mass concentration of 15.15% is obtained. The lithium sulfate leaching solution is sequentially passed through lithium hydroxide to adjust the pH value to 8, and plate and frame filtration (the pressure of the plate and frame filtration is 1.5 MPa, the pore size of the filter frame is 4μm), multi-media filtration (activated carbon, quartz sand and porous ceramics, the upper layer is activated carbon layer, the middle layer is quartz sand layer, and the lower layer is porous ceramic layer; the particle size of activated carbon is 0.6~1mm, stacked The density is 0.5t / m 3 ; The particle size of the quartz sand is 1.2 ~ 2.5mm, and the bulk density is 1.7t / m 3 The particle size of the porous ceramic is 2~4mm, and the bulk density is 2.0t / m 3 ), security filtration (the pore size of the security filtration membrane is 3μm), ultrafiltration (the pore size is 0.04μm) and the adsor...

Embodiment 2

[0076] (1) After the spodumene is sulphated, roasted and leached, a lithium sulfate leaching solution with a mass concentration of 16.32% is obtained. The lithium sulfate leaching solution is sequentially passed through lithium hydroxide to adjust the pH value to 10, and plate and frame filtration (the pressure of the plate and frame filtration is 1.6 MPa, the pore size of the filter frame is 5μm), multi-media filtration (activated carbon, quartz sand and porous ceramics, the upper layer is activated carbon layer, the middle layer is quartz sand layer, and the lower layer is porous ceramic layer; the particle size of activated carbon is 0.6~1mm, stacked The density is 0.45t / m 3 ; The particle size of the quartz sand is 1.2 ~ 2.5mm, and the bulk density is 1.6t / m 3 The particle size of the porous ceramic is 2~4mm, and the bulk density is 1.9t / m 3 ), security filtration (the pore size of the security filtration membrane is 2μm), ultrafiltration (the pore size is 0.05μm) and polysty...

Embodiment 3

[0081] (1) After the spodumene is sulphated, roasted and leached, a lithium sulfate leaching solution with a mass concentration of 17.13% is obtained. The lithium sulfate leaching solution is successively passed through lithium hydroxide to adjust the pH to 13, and plate and frame filtration (the pressure of the plate and frame filtration is 2.5MPa The pore size of the filter frame is 8μm), multi-media filtration (activated carbon, quartz sand and porous ceramics, the upper layer is activated carbon layer, the middle layer is quartz sand layer, and the lower layer is porous ceramic layer; the particle size of activated carbon is 0.6~1mm, and the bulk density 0.55t / m 3 ; The particle size of the quartz sand is 1.2 ~ 2.5mm, and the bulk density is 1.75t / m 3 The particle size of the porous ceramic is 2~4mm, and the bulk density is 2.1t / m 3 ), security filtration (the pore size of the security filtration membrane is 4μm), ultrafiltration (the pore size is 0.01μm) and polyacrylic resi...

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Abstract

The invention relates to the field of chemical products. The invention provides a method for preparing lithium hydroxide monohydrate from a spodumene sulfuric acid leaching solution. The method comprises the following steps: impurities are purified and removed from a lithium sulfate leaching solution; according to the method, the bipolar membrane electrodialysis treatment is directly carried out to prepare the battery-grade lithium hydroxide monohydrate, so that the usage amount of caustic soda is reduced when the lithium hydroxide monohydrate is prepared from lithium sulfate by virtue of a causticization method in a traditional method, a low-temperature freeze-out link is omitted, resources and energy sources are saved, and meanwhile, the production cost can be reduced; the lithium hydroxide monohydrate prepared by the method provided by the invention is relatively high in purity and can meet the requirements of battery-grade lithium hydroxide monohydrate. In addition, in the method provided by the invention, the by-product sulfuric acid aqueous solution containing lithium sulfate generated by bipolar membrane electrolysis can be effectively utilized, so that the emission of wastes is reduced, and resources can be fully utilized.

Description

Technical field [0001] The invention relates to the field of chemical products, in particular to a method for preparing lithium hydroxide monohydrate from a spodumene sulfuric acid leaching solution. Background technique [0002] Lithium hydroxide has a wide range of uses in petroleum, chemical raw materials, battery industry, defense industry, atomic energy and aerospace industry. The current methods for preparing lithium hydroxide are generally sodium carbonate pressure leaching method and causticizing method. [0003] The sodium carbonate pressure leaching method is to grind the transformed spodumene concentrate and mix it with sodium carbonate, then leaching at 200°C, and introducing CO 2 Forms soluble LiHCO 3 , Filter to remove the residue, then add refined lime milk, the reaction solution is concentrated and crystallized to obtain lithium hydroxide monohydrate. However, in the preparation process, the sodium carbonate is leached through high temperature and high pressure, an...

Claims

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Application Information

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IPC IPC(8): C25B1/16C25B9/10C25B13/02C25B15/00C25B9/23
CPCC25B1/16C25B13/02C25B15/00C25B9/19C25B9/23Y02P10/20
Inventor 郭铭潇孙来来赖立坤马樑汪敏张金光
Owner 杭州科锐环境能源技术有限公司
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