Method for separating magnesium and lithium in salt lake brine and producing magnesium hydroxide and high-purity magnesium oxide

A technology of magnesium hydroxide and salt lake brine, applied in magnesium hydroxide, magnesium oxide and other directions, can solve the problems of abandonment of precious magnesium resources, underutilization of magnesium, waste of resources, etc., and achieves small loss rate, high purity, and separation process. simple effect

Active Publication Date: 2016-07-20
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods only extract lithium from brine, but the magnesium left after lithium extraction is not fully ut

Method used

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  • Method for separating magnesium and lithium in salt lake brine and producing magnesium hydroxide and high-purity magnesium oxide

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

[0022] A. Salt lake brine solution A: [Mg 2+ ]=80g / L, [Li + ]=5g / L, take 250mL solution.

[0023] B. Weigh 66.7 g of NaOH and dissolve it in 250 mL of deionized water to obtain alkali solution B.

[0024] C. Pour the old brine solution A and alkali solution B into the colloid mill at the same time, and rotate at 1000r / min for 2 minutes to form Mg(OH) 2 Crystal nucleus, transfer the crystal nucleus solution to the reactor, stir and crystallize at 40°C for 10 hours, after the reaction, reduce the solution temperature to 20°C, and filter to obtain Mg(OH) 2 The filter cake was dried at 60°C for 8 hours to obtain solid Mg(OH) 2 Product, the molecular formula is: Mg(OH) 2 , Purity 99.0%

[0025] D. The Mg(OH) obtained in step C 2 In an air atmosphere, the solid is heated to 600°C at a heating rate of 5°C / min, kept for 6 hours, and calcined to obtain solid magnesium oxide. The molecular formula is MgO, and the purity is 99.0%.

[0026] E. Evaporate and concentrate the filtra...

Example Embodiment

[0027] Example 2

[0028] A. Salt lake brine solution A: [Mg 2+ ]=60g / L, [Li + ] = 1g / L, take 250mL solution.

[0029] B. Weigh 50g of NaOH and dissolve it in 250 mL of deionized water to obtain alkaline solution B.

[0030] C. Pour the old brine solution A and alkali solution B into the colloid mill at the same time, and rotate at 1000r / min for 2 minutes to form Mg(OH) 2 Crystal nucleus, transfer the crystal nucleus solution to the reactor, stir and crystallize at 40°C for 10 hours, after the reaction, reduce the solution temperature to 20°C, and filter to obtain Mg(OH) 2 The filter cake was dried at 60°C for 8 hours to obtain solid Mg(OH) 2 Product, the molecular formula is: Mg(OH) 2 , The purity is 99.2%.

[0031] D. The Mg(OH) obtained in step C 2 The solid is calcined in an air atmosphere, the heating rate is 2°C / min, the temperature is increased to 500°C, and the temperature is kept for 5 hours to obtain solid magnesium oxide. The molecular formula is MgO and the purity is 99.2%....

Example Embodiment

[0033] Example 3

[0034] A. Salt lake brine solution A: [Mg 2+ ]=70g / L, [Li + ]=3g / L, take 250mL solution.

[0035] B. Weigh 58.3 g of NaOH and dissolve it in 250 mL of deionized water to obtain alkali solution B.

[0036] C. Pour the old brine solution A and alkali solution B into the colloid mill at the same time, and rotate at 3000r / min for 3 minutes to form Mg(OH) 2 Crystal nucleus, transfer the crystal nucleus solution to the reactor, stir and crystallize at 50℃ for 12 hours, after the reaction, reduce the temperature of the solution to 30℃, and filter to obtain Mg(OH) 2 The filter cake was dried at 70°C for 10 hours to obtain solid Mg(OH) 2 Product, the molecular formula is: Mg(OH) 2 , The purity is 99.0%.

[0037] D. The Mg(OH) obtained in step C 2 The solid is calcined in an air atmosphere, the heating rate is 7°C / min, the temperature is increased to 700°C, and the temperature is kept for 8 hours to obtain solid magnesium oxide. The molecular formula is MgO and the purity is 9...

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Abstract

The invention provides a method for separating magnesium and lithium in salt lake brine and producing magnesium hydroxide and high-purity magnesium oxide.According to the method, the salt lake brine is subjected to solar evaporation and filtration to remove insoluble impurities, and then an old brine solution is obtained; an alkaline solution and the old brine solution are mixed for a precipitation reaction or fully back-mixed in a colloid mill for quick precipitation and then transferred into a reactor to be crystallized at proper temperature; filtration and drying are carried out to obtain Mg(OH)2 with the purity higher than 99%; roasting is carried out to obtain a solid magnesium oxide product with the purity higher than 99%.Filtrate is evaporated and concentrated to obtain a lithium-rich solution which can be directly used for preparing a lithium carbonate product.By the adoption of the reaction-separation coupling technology, nanoscale magnesium hydroxide and the high-purity magnesium oxide product are produced while magnesium and lithium in the salt lake brine are separated.The loss rate of lithium is small (smaller than 10%), the yield is high (larger than 90%), the separation process is simple, and prepared magnesium hydroxide is high in purity.

Description

Technical field [0001] The invention relates to a method for separating magnesium and lithium from salt lake brine by using a reaction-separation coupling technology to simultaneously produce magnesium hydroxide and high-purity magnesium oxide. Background technique [0002] Lithium and its compounds are key metal materials for high-tech development in the 21st century. They have an important strategic position in the development of energy storage materials and clean nuclear energy, and are known as "energy metals that promote world progress." Salt lake lithium resources account for more than 69% of the world’s industrial reserves of lithium resources, and my country’s lithium resource reserves rank fifth in the world, of which salt lake lithium resources account for 71%. The extraction of lithium from salt lake brines has become my country’s top priority in competing for energy strategic highlands. Major national strategic needs. [0003] There are many important resources in the s...

Claims

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Application Information

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IPC IPC(8): C01F5/08C01F5/22
CPCC01F5/08C01F5/22C01P2006/80
Inventor 项顼绪连萧段雪
Owner BEIJING UNIV OF CHEM TECH
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