Method for extracting lithium salt from spodumene

A spodumene, lithium extraction technology, applied in lithium carbonate;/acid carbonate, improvement of process efficiency, etc., can solve the problems of high energy consumption, high production cost, long industrial process, etc. of the lime method, To achieve the effect of stable product quality, low production cost and high resource utilization

Active Publication Date: 2011-01-19
GANFENG LITHIUM CO LTD
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AI Technical Summary

Benefits of technology

This patented technology allows for efficient recovery of Lithiite (LiCoO2) by converting it into Li2CO3 through various processes such as heat treatment, acidic or basic dissolving methods like solvent-based techniques, precipitation with water, filtration, evaporation/distillage, etc., followed by further processing. By performing these operations at different stages during this process, LixCobalt can be obtained that meets specific technical requirements needed for commercial use.

Problems solved by technology

Layerley describes different ways to produce Lithiate Salmonites (LSS) containing rare metallic elements like Magnetite FeCo). However, current techniques involve either expensive chemicals or complicated processes involving multiple steps.

Method used

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  • Method for extracting lithium salt from spodumene
  • Method for extracting lithium salt from spodumene

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 〔1〕The spodumene concentrate is placed in an internally heated rotary furnace, hot dirty gas and air are introduced at 350°C, and converted and roasted at a high temperature of 1250°C to convert from α-type to β-type;

[0041] [2] Cooling and grinding: the roasted material still has high residual heat, so it is cooled to normal temperature by heat exchange; in the process of pressure cooking, in order to make the roasted material and the material liquid have enough contact surface, the roasted and ground To 325 mesh, the content of lithium oxide was analyzed to be 5.13%.

[0042] 〔3〕Slurry mixing: add soda ash and finely ground spodumene to a corresponding amount of water to prepare a slurry, control the molar ratio of sodium to lithium to 4, and the liquid-solid ratio to 4, and the weight of soda ash is included in the liquid phase.

[0043] 〔4〕Press immersion: use high-pressure steam to raise the temperature of the slurry to 210°C, the corresponding pressure of the hi...

Embodiment 2

[0051] 〔1〕The spodumene concentrate is placed in an internally heated rotary furnace, hot dirty gas and air are introduced at 350°C, and converted and roasted at a high temperature of 1150°C to convert from α-type to β-type;

[0052] [2] Cooling and grinding: In order to make the roasted material and the material liquid have sufficient contact surface during the pressure cooking process, the roasted material is ground to 200 meshes, and the content of lithium oxide is analyzed to be 5.03%.

[0053] 〔3〕Slurry mixing: add caustic soda and finely ground spodumene to a corresponding amount of water to prepare a slurry, control the molar ratio of sodium to lithium to 4.5, and the liquid-solid ratio to 4.5, and the weight of caustic soda is included in the liquid phase.

[0054] 〔4〕Press immersion: Use high-pressure steam to raise the temperature of the slurry to 230°C, the corresponding pressure is 2.2Mpa, and the constant temperature and pressure time is 2h.

[0055] 〔5〕Reducing t...

Embodiment 3

[0063] 〔1〕Put the spodumene concentrate in an internally heated rotary furnace, introduce hot dirty gas and air at 330°C, and convert and roast at a high temperature of 1200°C to convert from α-type to β-type;

[0064] [2] Cooling and grinding: In order to make the roasted material and the material liquid have sufficient contact surface during the pressure cooking process, the roasted material is ground to 325 mesh, and the content of lithium oxide is analyzed to be 5.08%.

[0065] 〔3〕Slurry mixing: ammonium bicarbonate (NH4) 2 CO 3 Add the corresponding amount of water to the finely ground spodumene to prepare a slurry, control the molar ratio of sodium to lithium to 2, the ratio of liquid to solid to 3, and the weight of ammonium bicarbonate is included in the liquid phase.

[0066] 〔4〕Press immersion: Use high-pressure steam to raise the temperature of the slurry to 180°C, the corresponding pressure is 1.1Mpa, and the constant temperature and pressure time is 1.5h.

[006...

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Abstract

The invention discloses a method for extracting lithium salt from spodumene, comprising the following steps: roasting, transforming, cooling, levigating, mixing size, carrying out pressure leaching, lowering temperature, reducing pressure, carbonizing, separating, washing, removing impurities, carrying out thermal decomposition, carrying out centrifugal separation, rinsing, drying and the like to obtain the qualified lithium carbonate product. The invention adopts the pressure leaching process to extract the lithium from the spodumene, has the advantages of simple and practical process, low production cost, less pollution, stable product quality and high resource utilization, better economic and social benefits, and suitability for extracting the lithium in industrialization.

Description

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Claims

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Application Information

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Owner GANFENG LITHIUM CO LTD
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