Method for pre-de-magnesium enriched lithium from salt lake bittern with high-magnesium-lithium ratio with dry method de-magnesium

A high magnesium-lithium ratio, salt lake brine technology, applied in the direction of magnesium chloride, magnesium halide, alkali metal chloride, etc., can solve the problems of incomplete separation of magnesium, low energy consumption of precipitation method, high separation efficiency, etc., to improve roasting conditions and process Concise, streamlined effect

Active Publication Date: 2009-08-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to incomplete hydrolysis of magnesium chloride crystals due to dehydration, it is difficult to completely hydrolyze magnesium chloride even at temperatures as high as 1200 ° C. Therefore, hydrolysis at temperatures higher than 1000 ° C in actual operation requires high energy consumption and incomplete separation of magnesium.
The precipitation method has low energy consumption and high separation efficiency, but the process is relatively long and the yield is low

Method used

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  • Method for pre-de-magnesium enriched lithium from salt lake bittern with high-magnesium-lithium ratio with dry method de-magnesium

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A. Concentration of brine: Evaporate and dehydrate beach-dried salt lake brine with a mass ratio of magnesium to lithium of 21, and remove 10.4% of the total liquid volume; crystallize magnesium chloride hexahydrate, filter; after crystallization, the content of lithium and magnesium in the concentrated solution is: lithium 8.5g / L; Magnesium 99.3g / L.

[0040] B. Spray drying: The concentrated brine is spray-dried at 450-480°C, the water in the brine evaporates rapidly, chloride crystallizes, and dehydration and hydrolysis of magnesium chloride crystals occur simultaneously.

[0041] C. Granulation: Spray water on the dry powder according to 20-22% of the dry material to make 8-10mm granules; place it at room temperature for natural crystallization and strengthening.

[0042] D. Roasting: Put the crystallized pellets into the furnace for roasting, the roasting temperature is 760-780°C, and the roasting time is 60 minutes; the magnesium chloride is hydrolyzed at high tem...

Embodiment 2

[0046] A. Concentration of brine: Evaporate and dehydrate beach-dried salt lake brine with a mass ratio of magnesium to lithium of 21, and remove 11.3% of the total liquid volume; crystallize magnesium chloride hexahydrate, filter; after crystallization, the content of lithium and magnesium in the concentrated solution is: lithium 9.7g / L; Magnesium 99.6g / L.

[0047] B. Spray drying: The concentrated brine is spray-dried at 560-580°C, the water in the brine evaporates rapidly, the chloride crystallizes, and the dehydration and hydrolysis of magnesium chloride crystals occur simultaneously.

[0048] C. Granulation: according to the amount of dry material 14-16%, spray water on the dry powder to make 12-14mm granules; place it at room temperature for natural crystallization and strengthening.

[0049] D. Roasting: Put the crystallized pellets into the furnace for roasting, the roasting temperature is 680-700°C, and the roasting time is 100 minutes; the magnesium chloride is hydr...

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Abstract

The invention relates to a method for removing magnesium-enriched lithium in advance from saline lake brine with a high magnesium-lithium ratio through dry-process magnesium removal. The method is to take the saline lake brine with the high magnesium-lithium ratio as a raw material and adopt the technological steps of brine concentration, spray drying, granulation, roasting, water leaching, and the like to remove most magnesium in the brine, so that lithium can be conveniently extracted with low cost. The main technical points of the method comprises that: the dry-process magnesium removal is based on a high-temperature hydrolysis principle of magnesium chloride to convert most soluble magnesium compounds into magnesium compounds (MgO) which are difficult to be dissolved in water, and magnesium oxychloride (MgOHCl) which is hydrolyzed in the water, so that soluble lithium chloride and magnesium chloride (which are mainly generated by hydrolysis under the condition of the water leaching of the magnesium oxychloride) are dissolved out through the water leaching, and the removal of the magnesium-enriched lithium in the brine in advance is realized. The method comprehensively utilizes magnesium resources and lithium resources of saline lakes, has the characteristics of high magnesium removal efficiency, good enriching effect of lithium salts, high recovery rate, low energy consumption, low cost, small project investment, and the like, and is particularly suitable for industrial production on a large scale. In addition, the whole process is simple, clean and environment-friendly.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, and in particular relates to a process method for enriching lithium salt from salt lake brine, in particular to a method for enriching lithium from salt lake brine with a high magnesium-to-lithium ratio. Background technique [0002] Lithium is an important non-ferrous metal, known as "the energy metal of the 21st century". It is widely used in many high-tech fields such as energy and aviation, and occupies an extremely important position in the global economy. Global lithium resources can be divided into five types, namely pegmatite lithium, brine lithium, seawater lithium, hot spring lithium, and accumulated lithium ore. Currently, the lithium resources mined and utilized are mainly pegmatite lithium ore and brine lithium ore. Most of the current global lithium consumption comes from lithium brine mines. [0003] At present, the key technology for extracting lithium from salt lake br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/08C01F5/30
Inventor 胡启阳李新海王志兴郭华军
Owner CENT SOUTH UNIV
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