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A kind of method of preparing lithium hydroxide monohydrate by spodumene sulfuric acid leaching solution

A technology of monohydrate lithium hydroxide and lithium hydroxide, applied in the field of chemical products, can solve the problems of waste of water resources, large energy consumption, inability to meet low-carbon environmental protection and other problems

Active Publication Date: 2021-06-04
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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  • A kind of method of preparing lithium hydroxide monohydrate by spodumene sulfuric acid leaching solution
  • A kind of method of preparing lithium hydroxide monohydrate by spodumene sulfuric acid leaching solution
  • A kind of method of preparing lithium hydroxide monohydrate by spodumene sulfuric acid leaching solution

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Effect test

Embodiment 1

[0071] (1) Lithium sulfate leaching solution that mass concentration is 15.15% is obtained after spodumene is through sulfuration roasting, leaching, and lithium sulfate leaching solution is adjusted pH value to 8 through lithium hydroxide successively, plate and frame filter (the pressure of plate and frame filter 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 an activated carbon layer, the middle layer is a quartz sand layer, and the lower layer is a porous ceramic layer; the particle size of activated carbon is 0.6 ~ 1mm. 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 ceramics is 2-4mm, and the bulk density is 2.0t / m 3 ), security filtration (the filter membrane aperture of security filtration is 3 μ m), ultrafiltration (pore diameter is 0.04 μ m) and after aminophosphonic acid...

Embodiment 2

[0076](1) Lithium sulfate leaching solution that mass concentration is 16.32% is obtained after spodumene is through sulfuration roasting, leaching, and lithium sulfate leaching solution is adjusted pH value to 10 through lithium hydroxide successively, plate and frame filter (the pressure of plate and frame filter is 1.6 MPa, the pore size of the filter frame is 5μm), multi-media filtration (activated carbon, quartz sand and porous ceramics, in which the upper layer is an activated carbon layer, the middle layer is a quartz sand layer, and the lower layer is a 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 ceramics is 2-4mm, and the bulk density is 1.9t / m 3 ), security filtration (the filter membrane aperture of security filtration is 2 μ m), ultrafiltration (pore diameter is 0.05 μ m) and after po...

Embodiment 3

[0081] (1) Lithium sulfate leaching solution with a mass concentration of 17.13% is obtained after sulfation roasting and leaching of spodumene, the lithium sulfate leaching solution is adjusted to pH to 13 through lithium hydroxide successively, and plate and frame filter (the pressure of plate and frame filter is 2.5MPa , the pore size of the filter frame is 8μm), multi-media filtration (activated carbon, quartz sand and porous ceramics, wherein the upper layer is an activated carbon layer, the middle layer is a quartz sand layer, and the lower layer is a 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 ceramics is 2-4mm, and the bulk density is 2.1t / m 3 ), security filtration (the membrane aperture of security filtration is 4 μ m), ultrafiltration (pore diameter is 0.01 μ m) and polyacrylic acid res...

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Abstract

The invention relates to the field of chemical products, and provides a method for preparing lithium hydroxide monohydrate from spodumene sulfuric acid leaching solution. In the invention, after the lithium sulfate leaching solution is purified and removed, it is directly subjected to bipolar membrane electrodialysis treatment to prepare battery-grade monohydrate Lithium hydroxide in water reduces the amount of caustic soda used in the traditional method of preparing lithium hydroxide monohydrate from lithium sulfate through the causticization method, saves the low-temperature freeze-out link, saves resources and energy, and can reduce production costs at the same time The purity of lithium hydroxide monohydrate prepared by the method provided by the invention is relatively high, which can meet the requirements of battery grade lithium hydroxide monohydrate. Moreover, in the method provided by the present invention, the sulfuric acid aqueous solution containing lithium sulfate as a by-product produced by electrolysis of the bipolar membrane can be effectively utilized, reducing waste discharge, and being conducive to full utilization of resources.

Description

technical field [0001] The invention relates to the field of chemical products, in particular to a method for preparing lithium hydroxide monohydrate from spodumene sulfuric acid leaching solution. Background technique [0002] Lithium hydroxide is widely used in petroleum, chemical raw materials, battery industry, national defense industry, atomic energy and aerospace industry. The current methods for preparing lithium hydroxide are generally sodium carbonate pressure leaching method and causticization 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 passing CO 2 Formation of soluble LiHCO 3 , filter to remove the residue, then add refined milk of lime, and the reaction solution is concentrated and crystallized to obtain lithium hydroxide monohydrate. However, due to the high temperature and high pressure during the leaching of sodium carbonate an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/16C25B9/21C25B13/02C25B15/00C22B3/44C22B3/22C25B9/23
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