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Method for extracting lithium salt from spodumene by soda ash pressure leach method

A technology for spodumene and lithium extraction, which is applied in the field of preparation of extracting lithium salts, can solve the problems of reducing lithium recovery rate, increasing processes, increasing production cost, etc., and achieves the effects of low production cost, simple and practical process, and high resource utilization.

Active Publication Date: 2013-07-03
GANFENG LITHIUM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two disadvantages in this method. The one is that lithium carbonate and slag are mixed together, and it is difficult to completely convert lithium carbonate into lithium bicarbonate by carbonization, which causes part of lithium carbonate to enter the slag and discard it, reducing the recovery rate of lithium. The second is, This method can only be used to prepare battery-grade lithium carbonate. To prepare anhydrous lithium chloride and lithium nitrate, steps such as acidification, evaporation and concentration, and drying are required. Compared with the method for preparing anhydrous lithium chloride and lithium nitrate in this patent, the process, resulting in increased production costs

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  • Method for extracting lithium salt from spodumene by soda ash pressure leach method

Examples

Experimental program
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Effect test

Embodiment 1

[0052] 〔1〕Put 1000Kg of spodumene concentrate in an internally heated rotary furnace, and carry out conversion and roasting at a high temperature of 1250°C to convert from α-type to β-type;

[0053] 〔2〕Cooling and grinding: the roasted material still has high waste heat, so it is cooled to normal temperature by heat exchange; in the process of pressing and immersion, 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 5.63%.

[0054] [3] Slurry: 800Kg of soda ash and 1000Kg of finely ground spodumene are added to 3200Kg of water to prepare a slurry, the molar ratio of sodium to lithium is controlled to be 4, the liquid-solid ratio is 4, and the weight of soda ash is included in the liquid phase.

[0055] 〔4〕Press immersion: use high-pressure steam to raise the temperature of the slurry to 270°C, the corresponding pressure of the high-pressure steam is 2.4M...

Embodiment 2

[0065] (1) Put 1500Kg of spodumene concentrate in an internal heating rotary furnace, and carry out conversion roasting at a high temperature of 1150°C to convert from α-type to β-type;

[0066] (2) Cooling and grinding: the roasted material still has high waste heat, so it is cooled to normal temperature by heat exchange; After the material is ground to 50 orders, the mass percentage composition of lithium oxide is analyzed to be 5.15%;

[0067] (3) Slurry: Add 600Kg of soda ash and 1500Kg of finely ground spodumene obtained in step (2) to 5400Kg of water to prepare a slurry, control the molar ratio of sodium to lithium to 2.2, and the liquid-solid ratio to 4. The weight of soda ash is included in the liquid phase ;

[0068] (4) Pressure immersion: use high-pressure steam to raise the temperature of the slurry obtained in step (3) to 180°C, the corresponding pressure of high-pressure steam is 1.0Mpa, and the time for maintaining constant temperature and pressure is 0.5h;

...

Embodiment 3

[0078] (1) Put 800Kg of spodumene concentrate in an internal heating rotary furnace, and carry out conversion and roasting at a high temperature of 1200°C to convert from α-type to β-type;

[0079] (2) Cooling and grinding: the roasted material still has high residual heat, so it is cooled to normal temperature by heat exchange; Grinding to 260 mesh, the mass percentage of lithium oxide was analyzed to be 5.58%.

[0080] (3) Slurry: Add 640Kg of soda ash and 800Kg of finely ground spodumene to 2560Kg of water to make a slurry, control the molar ratio of sodium to lithium to 4, and the ratio of liquid to solid to 4, and the weight of soda ash is included in the liquid phase.

[0081] (4) Pressure immersion: use high-pressure steam to raise the temperature of the slurry obtained in step (3) to 200°C, the corresponding pressure of high-pressure steam is 1.6Mpa, and the time for maintaining constant temperature and pressure is 2h.

[0082] (5) Cooling and decompression: the slurr...

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Abstract

The invention discloses a method for extracting lithium salt from spodumene by a soda ash pressure leach method. The method comprises the following technological process: (1) roasting and transforming; (2) cooling and grinding; (3) size mixing; (4) pressure leaching; and (5) cooling and decompressing. The method is characterized by further comprising the following technological process: (6) pressure filtering and separating; (7) acidifying and transforming; (8) separating and washing; (9) condensing and separating out sodium; (10) evaporating and crystallizing; (11) centrifugal separation; and (12) drying. The method for extracting lithium salt from spodumene by the soda ash pressure leach method provided by the invention is simple in process, low in cost and high in resource utilization rate.

Description

technical field [0001] The invention relates to a preparation method for extracting lithium salt, in particular to a method for extracting lithium salt from spodumene by a soda ash pressure immersion method. Background technique [0002] The methods for producing lithium salts in industry are mainly divided into two categories: [0003] One is from the lithium-containing brine, through the comprehensive extraction and utilization of other valuable metal minerals in the brine, the lithium in the brine can be enriched, and finally Li can be obtained. 2 CO 3 or Li 2 SO 4 ·H 2 O and other lithium salt products, however, because most of the domestic salt lake brine has the characteristics of low magnesium-lithium ratio, the development is difficult, and the industrial implementation of lithium extraction from brine is difficult; [0004] Another method is to destroy the original gangue structure of the main lithium-containing ores, spodumene and lepidolite, by pyrolysis or w...

Claims

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Application Information

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IPC IPC(8): C01D15/04C01D15/10
CPCY02P10/20
Inventor 李良彬袁中强刘明王彬郁兴国胡萍罗光华
Owner GANFENG LITHIUM CO LTD
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