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Method for producing lithium sulfate solution by spodumene sulfate roasting method

A sulfate and lithium sulfate technology, applied in the field of lithium extraction from ores, can solve the problems of high energy consumption, large by-products, and complicated impurity removal in high-temperature calcination, and achieve the effect of simplifying subsequent impurity removal

Pending Publication Date: 2022-05-17
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium extraction process by sulfuric acid method mainly includes high-temperature calcination phase transformation, sulfation roasting, water immersion / slurry neutralization, etc., but this process has problems such as high-temperature calcination energy consumption, complicated impurity removal in the later stage, and a large amount of low-value sodium sulfate as a by-product.

Method used

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  • Method for producing lithium sulfate solution by spodumene sulfate roasting method
  • Method for producing lithium sulfate solution by spodumene sulfate roasting method
  • Method for producing lithium sulfate solution by spodumene sulfate roasting method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Will Li 2 Spodumene ore with an O content of 6.1% (mass fraction) and sodium sulfate were mixed evenly by dry ball milling at a mass ratio of 1:0.9, and placed in a muffle furnace for constant temperature roasting at 980 ° C for 30 min. After cooling to room temperature, the roasted material was crushed and ball-milled, leached with water at a solid-to-liquid ratio of 0.05 g / mL at 35°C for 120 min, and filtered to obtain a lithium sulfate solution.

[0036] according to figure 2 , when spodumene ore and sodium sulfate are mixed and roasted under the above conditions, α-spodumene reacts with sodium sulfate to generate lithium sodium sulfate. After water immersion, lithium sodium sulfate is dissolved and leached by water. After water immersion, the impurity ion content of the solution is K 18.8mg / L, Ca27.5mg / L, Mg 10.1mg / L, Si 18.3mg / L, Al 6.4mg / L, of which about 92% of the lithium in α-spodumene is transformed into a water-soluble lithium salt.

Embodiment 2

[0038] Will Li 2 Spodumene ore with an O content of 6.1% (mass fraction) and sodium sulfate were mixed evenly by dry ball milling at a mass ratio of 1:0.1, and placed in a muffle furnace for constant temperature roasting at 1050°C for 120min. After cooling to room temperature, the roasted material was crushed and ball milled, leached with water at a solid-to-liquid ratio of 0.05 g / mL at 35°C for 60 min, and filtered to obtain a lithium sulfate solution.

[0039] The XRD pattern of roasted material and water leaching residue and figure 2 Similarly, when spodumene ore and sodium sulfate are mixed and roasted under the above conditions, α-spodumene reacts with sodium sulfate to form lithium sodium sulfate. After water immersion, lithium sodium sulfate is dissolved and leached by water, of which about 80% α- The lithium in the spodumene is transformed into a water-soluble lithium salt.

Embodiment 3

[0041] Will Li 2 Spodumene ore with an O content of 5.3% (mass fraction) and sodium sulfate were mixed evenly by dry ball milling at a mass ratio of 1:3, and placed in a muffle furnace for constant temperature roasting at 700 °C for 50 min. After cooling to room temperature, the roasted material was crushed and ball-milled, leached with water at a solid-to-liquid ratio of 0.05 g / mL at 35°C for 120 min, and filtered to obtain a lithium sulfate solution.

[0042] The XRD pattern of roasted material and water leaching residue and figure 2 Similarly, when spodumene ore and sodium sulfate are mixed and roasted under the above conditions, α-spodumene reacts with sodium sulfate to form lithium sodium sulfate. After water immersion, lithium sodium sulfate is dissolved and leached by water, of which about 78% α- The lithium in the spodumene is transformed into a water-soluble lithium salt.

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Abstract

The invention provides a method for producing a lithium sulfate solution by a spodumene sulfate roasting method, which comprises the following steps: uniformly mixing spodumene ore and a roasting aid according to a certain proportion, and roasting in a muffle furnace to obtain a roasted material; and after cooling the roasted material, leaching the roasted material with water to obtain a lithium sulfate solution. The method for producing the lithium sulfate solution through the spodumene sulfate roasting method comprises the two working procedures of roasting and water leaching, the roasting temperature is lower than the phase transition temperature of traditional high-temperature calcination, water leaching can avoid the acid leaching working procedure and the problems of corrosion and the like caused by the acid leaching working procedure, energy consumption is reduced, and the economic benefits of producing the lithium sulfate solution through spodumene are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium extraction from ores, and in particular relates to a method for producing lithium sulfate solution by a spodumene sulfate roasting method. Background technique [0002] Lithium is widely used in new energy, aerospace, pharmaceutical manufacturing and other fields, and is one of the key minerals related to the national "double carbon" goal, economic development and national defense construction. In the context of global carbon neutrality, the demand for lithium in the global new energy industry and electronic consumer goods will continue to increase. [0003] Spodumene ore has the advantages of high lithium grade, less impurities, and abundant reserves. It has development and utilization value that cannot be ignored. It is one of the most important lithium ore resources at present. There are three crystal forms of spodumene, which are the α-type of the monoclinic system, the β-type of the tetragon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/06C22B3/04C22B26/12
CPCC22B1/06C22B3/04C22B26/12Y02P10/20
Inventor 刘程琳裘晟波孙天予朱明强刘行于建国
Owner EAST CHINA UNIV OF SCI & TECH
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