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Method and device for recycling lithium from exchange waste fluid containing lithium

A lithium exchange and waste liquid technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of lithium ion loss, no further involvement in treatment process and equipment, and difficult control of soft water washing and crystallization methods

Active Publication Date: 2012-06-13
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent No. 5,451,383 discloses a method for capturing and concentrating Li from lithium-containing dilute solutions + method, the main treatment object is the washing waste liquid of X molecular sieve after exchange, but the washing zeolite liquid accounts for a very small proportion in all lithium-containing subsequent waste liquids, and most of the lithium exists in the exchange waste liquid, although it is also mentioned Evaporation concentration and fractional crystallization are used to remove most of the sodium chloride, but the detailed treatment process and equipment are not further involved, and part of lithium chloride will also recrystallize with the precipitation of sodium chloride during the recrystallization process , some lithium ions are also lost due to adhesion in the precipitated crystals, and the proposed soft water washing crystallization method is difficult to control in actual operation

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  • Method and device for recycling lithium from exchange waste fluid containing lithium
  • Method and device for recycling lithium from exchange waste fluid containing lithium
  • Method and device for recycling lithium from exchange waste fluid containing lithium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]The exchange waste liquid in the small amount of liquid storage tank 1 is extracted, the pH value is 8, and the mass contents of KCl, NaCl, and LiCl are 2.3%, 5.4%, and 6.1%, respectively. Pump into the stirring tank 2 at a rate of 720 L / h, add 1 mol / L LiOH solution, control its flow rate to 1.5 L / h, mix and stir, and adjust the pH value of the solution to 10.5. Pump from the stirring tank 2 into the second-effect evaporation crystallizer with a flow rate of 720L / h through a plunger flow pump, evaporate at a temperature of 160°C, and evaporate the solution until the mass content of lithium chloride in the solution is 19%, and the second-effect The evaporation efficiency of the evaporative crystallizer is 540L / h, and the material discharged from the second-effect evaporative crystallizer is a solid-liquid mixture, that is, crystal slurry. The solid content of a part of the material is about 30% for testing. The magma is pumped into the shell and tube cooler 4 at a flow ra...

Embodiment 2

[0049] Extract the exchange waste liquid in the small amount of liquid storage tank 1, wherein the mass contents of KCl, NaCl, and LiCl are 3.7%, 7.6%, and 3.0%, respectively, and the pH value is 8.5. Pump into the stirring tank 2 at a rate of 790L / h, add 1mol / L LiOH solution, control its flow to 1.7L / h, add lithium chloride solid at a rate of 31kg / h, mix and stir, and dissolve the lithium chloride The content was adjusted to 7.0%, and the pH value of the solution was adjusted to 10.5. From the stirring tank 2, pump it into the second-effect evaporation crystallizer with a flow rate of 790L / h through the plunger flow pump, evaporate at 160°C, and evaporate the solution until the lithium chloride mass content in the solution is 18%, and the second-effect evaporation crystallizer The evaporation efficiency is 540L / h, and the material discharged from the second-effect evaporation crystallizer is a solid-liquid mixture, and the solid content of some materials is about 30% for test...

Embodiment 3

[0052] Extract the exchange waste liquid in a small amount of liquid storage tank 1, wherein the mass contents of KCl, NaCl, and LiCl are 3.7%, 7.6%, and 4.2%, respectively, and the pH value is 8.5. Pump into the stirring tank 2 at a rate of 790L / h, add 1mol / L LiOH solution, control its flow rate to 1.8L / h, add lithium chloride solid at a rate of 31kg / h, mix and stir, and dissolve the lithium chloride The content was adjusted to 7.0%, and the pH value of the solution was adjusted to 11. From the stirring tank 2, the flow rate of 790L / h is pumped into the falling film evaporator of the second-effect evaporation crystallizer through the plunger flow pump, and evaporated at a temperature of 150°C. The circulating evaporator uses the secondary steam generated in the falling film evaporator to evaporate again, and the solution is evaporated until the mass content of lithium chloride in the solution is 16%. The evaporation efficiency of the second-effect evaporation crystallizer is ...

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Abstract

The invention relates to a method and device for recycling lithium from exchange waste fluid containing lithium. The method comprises the steps of modulating potential of hydrogen (pH) value and concentration of the exchange waste fluid, evaporating and recrystallizing, cooling crystal mush, continuously subsiding and performing centrifugal separation, performing fluidized drying, dissolving withethanol and performing vacuum filtration distillation. Compared with the prior art, the method and device for recycling the lithium from the exchange waste fluid containing the lithium are suitable for recycling the lithium in the exchange waste fluid containing the lithium which is produced in the production of efficient adsorbent containing the lithium, and the method is high in recycling rate of lithium chloride, simple in process control, friendly to environment and free of pollution of waste gas, waste water and waste residues.

Description

technical field [0001] The invention relates to a high-efficiency lithium-containing modified adsorbent applied to pressure swing adsorption oxygen production technology, and more specifically relates to a technology for separating and reusing lithium chloride from lithium-containing exchange waste liquid generated during the production of the adsorbent. Background technique [0002] At present, there are two main technologies for separating air to produce oxygen, one is the traditional freeze separation method, and the other is the pressure swing adsorption method. In the fields of large-scale air separation and high oxygen purity requirements, pressure swing adsorption technology still cannot compete with cryogenic separation, but in occasions with moderate oxygen production scale and low purity requirements, such as oxygen-enriched roasting, high-efficiency medical oxygen production For machine and other purposes, pressure swing adsorption oxygen production has unique adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 王鹏飞何秋平李豫晨周永贤
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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