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Comprehensive utilization method of salt lake byproduct magnesium hydroxide

A magnesium hydroxide and hydroxide technology, which is applied in the field of comprehensive utilization of salt lake resources, can solve the problems of inability to use directly, does not meet the green circular economy, low purity, etc., reduces the preparation cost and equipment requirements, and realizes high-value waste. Ease of use and operation

Inactive Publication Date: 2018-02-09
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the utilization process of magnesium resources, a considerable amount of by-product magnesium hydroxide is generally produced, which contains a large amount of magnesium hydroxide, and a small amount of lithium, boron, calcium, silicon and other elements; due to the by-product magnesium hydroxide (hydrogen Magnesium oxide content ≥ 50%) has low purity and many types of impurity ions, which cannot be directly used and are discarded by most enterprises, which not only causes environmental pollution, but also causes waste of resources, which does not meet the green circular economy advocated by our country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The mass percentages of Mg, Li, and B in the magnesium hydroxide by-product of lithium extraction from salt lakes used in this example are 35%, 3.5%, and 2.7%, respectively, and also contain a small amount of cations such as Ca, Na, K, and Si, and CO 3 2- , Cl - and other anions.

[0048] Take 20.8g of magnesium hydroxide, a by-product of lithium extraction from salt lake, and disperse it in 500mL of water, and add 7.8g of Al(OH) to it 3 and 14.2 g Na 2 SO 4 , and hydrothermally reacted at 120°C for 24h, the obtained product was centrifuged, the solid phase was washed with water at 50°C and then dried to obtain a layered composite metal hydroxide.

[0049] After the filtrate and washing liquid are recovered, the lithium and boron therein are recovered by the adsorption method and the extraction method respectively through concentration.

Embodiment 2

[0051] The mass percentages of Mg, Li, and B in the magnesium hydroxide by-product of lithium extraction from salt lakes used in this example are 30%, 8%, and 2.4%, respectively, and also contain a small amount of cations such as Ca, Na, K, and Si, and CO 3 2- , Cl - and other anions.

[0052] Take 32.1g of magnesium hydroxide, a by-product of lithium extraction from salt lake, and disperse it in 600mL of water, and add 7.8g of Al(OH) to it 3 and 10.7g Fe(OH) 3 , then add 24g NH 4 NO 3 Afterwards, hydrothermal reaction was carried out at 200° C. for 48 hours, and the obtained product was centrifugally separated and washed, and the solid particles were layered composite metal hydroxides.

[0053] After the filtrate and washing liquid are recovered, the lithium and boron therein are recovered by membrane separation method and extraction method respectively through concentration.

Embodiment 3

[0055] The mass percentages of Mg, Li, and B in the magnesium hydroxide by-product of lithium extraction from salt lakes used in this example are 32%, 3.5%, and 2.7%, respectively, and also contain a small amount of cations such as Ca, Na, K, and Si, and CO 3 2- , Cl - and other anions.

[0056] Take 22.7g of magnesium hydroxide, a by-product of lithium extraction from salt lake, and disperse it in 300mL of water, and add 9.9g of Zn(OH) 2 , 0.16g Al(OH) 3 and 0.2g Fe(OH) 3 , and then add 0.16g of sodium salicylate, microwave crystallization reaction at 180°C for 24 hours, centrifuge the obtained product, wash and centrifuge the solid phase and dry to obtain a layered composite metal hydroxide.

[0057] After the filtrate and washing liquid are recovered, the lithium and boron in them are recovered by extraction method respectively through concentration.

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Abstract

The invention discloses a comprehensive utilization method of salt lake byproduct magnesium hydroxide. The comprehensive utilization method is used to prepare a lamellar composite metal hydroxide, thelamellar composite metal hydroxide comprises a low-valence main body laminate positive ion at least comprising a magnesium ion, a high-valence main body laminate positive ion and an interlamination negative ion; and the comprehensive utilization method comprises the following steps: S1, mixing the salt lake byproduct magnesium hydroxide and hydroxide of the high-valence positive ion, and dissolving in water to obtain a first mixture; S2, adding a corresponding water soluble salt of the interlamination negative ion into the first mixture, and mixing evenly to obtain a second mixture; and S3, enabling the second mixture to react for 4-100 hours at the temperature of 80-300 DEG C, conducting solid-liquid separation on a reaction product, and drying an obtained solid phase to obtain the lamellar composite metal hydroxide. According to the comprehensive utilization method provided by the invention, the salt lake byproduct magnesium hydroxide is used to prepare the lamellar composite metalhydroxide, and the resources like lithium and boron in the salt lake byproduct magnesium hydroxide are also recycled.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of salt lake resources, and in particular relates to a method for comprehensive utilization of by-product magnesium hydroxide in salt lakes. Background technique [0002] Composite metal hydroxides (referred to as LDHs) are a layered material. LDHs are assembled from positively charged metal hydroxide laminates and negatively charged interlayer anions. The metal hydroxide laminates contain Metal cations of different charges. In the existing LDHs, the metal cations are mainly divalent metal cations and trivalent metal cations, so the general structural formula of the LDHs can be expressed as: [M + m 2+ 1-y-0.5x-2z m 3+ y m 4+ z (OH) 2 ](A n- ) y / n mH 2 O, where M + , M 2+ , M 3+ and M 4+ represent monovalent metal cations, divalent metal cations, trivalent metal cations and tetravalent metal cations on the metal hydroxide laminate, respectively, A n- Indicates inte...

Claims

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Application Information

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IPC IPC(8): C01F7/00C01G49/00C01G41/00
CPCC01F7/00C01G41/00C01G49/00
Inventor 樊发英唐志雷邓小川
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI