Process method for extracting Mg and Li from bittern and simultaneously producing hydrotalcite

A process method, magnesium aluminum hydrotalcite technology, applied in the process field of extracting magnesium and lithium from brine and producing hydrotalcite at the same time, achieving the effect of small loss of lithium, simple equipment, and low loss rate

Active Publication Date: 2015-12-16
QINGHAI WESTERN MAGNESIUM NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the simultaneous production of MgAl-LDH and LiAl-LDH functional materials using salt lake brine in the separation of magnesium and lithium

Method used

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  • Process method for extracting Mg and Li from bittern and simultaneously producing hydrotalcite
  • Process method for extracting Mg and Li from bittern and simultaneously producing hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A. Weigh MgCl 2 ·6H 2 O26.0325g, MgSO 4 ·7H 2 O25.7993g, AlCl 3 ·6H 2 O18.729g, KCl3.3873g, LiCl1.8768g, NaCl8.068g were dissolved in deionized water, and the 250mL volumetric flask was constant to obtain a salt solution; NaOH19.8593g, NaCO 3 16. 4443g was dissolved in deionized water, and the 250mL volumetric flask was made to volume to obtain an alkaline solution;

[0027] Pour the salt solution and the alkali solution into the colloid mill at the same time, and rotate at a speed of 3000r / min for 3 minutes to form the MgAl-LDH crystal nucleus; transfer the crystal nucleus solution to the reactor, stir and crystallize at 80°C for 12 hours, and perform MgAl-LDH crystallization. LDH growth; filtering to obtain a MgAl-LDH filter cake, and drying the MgAl-LDH filter cake at 70°C for 12 hours to obtain a white solid MgAl-LDH product; collect the filtrate into a container.

[0028] B. Evaporate and concentrate the filtrate of step A to 250mL at 50°C, when the lithium i...

Embodiment 2

[0031] A. Weigh MgCl 2 ·6H 2 O39.0487g, MgSO 4 ·7H 2 O38.6989g, Al(NO 3 ) 3 9H 2 O29.1008g, KCl9.1837g, LiCl1.8768g, NaCl8.068g were dissolved in deionized water, and the 250mL volumetric flask was constant to obtain a salt solution; NaOH22.3368g, NaCO 3 16. 4443g was dissolved in deionized water, and the 250mL volumetric flask was made to volume to obtain an alkaline solution;

[0032] Pour the salt solution and the alkali solution into the colloid mill at the same time, and rotate at a speed of 4000r / min for 5 minutes to form the MgAl-LDH crystal nucleus; transfer the crystal nucleus solution to the reactor, and carry out the crystallization of MgAl-LDH at 80°C for 12 hours. LDH growth; filtering to obtain a MgAl-LDH filter cake, drying the MgAl-LDH filter cake at 80°C for 6 hours to obtain a white solid MgAl-LDH product; collecting the filtrate into a container.

[0033] B. Evaporate and concentrate the filtrate of step A to 250mL at 50°C, when the lithium ion concen...

Embodiment 3

[0036] A. Weigh MgCl 2 ·6H 2 O39.0487g, MgSO 4 ·7H 2 O29.139g, Al 2 (SO 4 ) 3 18H 2 O25.8488g, KCl9.1837g, LiCl1.8768g, NaCl8.068g were dissolved in deionized water, and the 250mL volumetric flask was constant to obtain a salt solution; NaOH22.3223g, NaCO 3 16. 4443g was dissolved in deionized water, and the 250mL volumetric flask was made to volume to obtain an alkaline solution;

[0037] Pour the salt solution and the alkali solution into the colloid mill at the same time, and rotate at a speed of 2000r / min for 6 minutes to form the MgAl-LDH crystal nucleus; transfer the crystal nucleus solution to the reactor, stir and crystallize at 70°C for 10 hours, and perform MgAl-LDH crystallization. LDH growth; filtering to obtain a MgAl-LDH filter cake, drying the MgAl-LDH filter cake at 80°C for 8 hours to obtain a white solid MgAl-LDH product; collecting the filtrate into a container.

[0038] B. Evaporate and concentrate the filtrate of step A to 250mL at 50°C, when the l...

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Abstract

The invention provides a process method for separating Mg and Li from salt lake bittern and simultaneously producing magnesium-aluminum layered double hydroxide (MgAl-LDH) and lithium-aluminum layered double hydroxide (LiAl-LDH) by a reaction-separation combined technology. The process method comprises adding an Al salt in bittern, carrying out coprecipitation and crystallization on the bittern and alkali lye for coprecipitation to obtain an MgAl-LDH solid product and a filtrate, carrying out evaporation concentration on the filtrate to obtain Li-rich bittern, adding an Al salt into the Li-rich bittern, carrying out coprecipitation on the mixed Li-rich bittern and alkali lye, carrying out separation to obtain a LiAl-LDH solid product and a filtrate, carrying out evaporation concentration on the filtrate and recycling the concentrate. Mg in bittern can form MgAl-LDH and the MgAl-LDH is separated at first so that the traditional method for separating Mg and Li from a high Mg / Li ratio solution has high difficulty. Through the reaction-separation combined technology, Mg and Li resources in salt lake bittern are separated and simultaneously, MgAl-LDH and LiAl-LDH functional material production is realized. The process method realizes salt lake resource separation and produces a high added value functional material.

Description

technical field [0001] The invention relates to a technology for separating and extracting magnesium and lithium resources in salt lake brine and simultaneously producing magnesium-aluminum and lithium-aluminum hydrotalcites by using reaction-separation coupling technology. Background technique [0002] Salt lakes usually refer to lakes with a salt content greater than 50g·L -1 lakes. my country is rich in salt lake resources. Among them, Inner Mongolia is dominated by carbonate-type salt lakes, Xinjiang is dominated by sulfate-type salt lakes, Qaidam Basin in Qinghai is dominated by sulfate-type and chloride-type salt lakes, and Tibet They are carbonate type and sulfate type salt lakes. There are many important resources in the salt lake, such as potassium, sodium, magnesium, lithium, boron, etc., which are important raw materials for the production of various industrial and agricultural products. [0003] The direct development of salt lakes mainly refers to the direct e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00C01F7/785C01F7/784
CPCC01P2002/22C01P2002/72C01P2004/03C01P2004/04C01F7/785C01F7/784B01D61/44B01D61/58C04B22/06C04B26/26
Inventor 项顼王瑞瑞周辰段雪
Owner QINGHAI WESTERN MAGNESIUM NEW MATERIAL CO LTD
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