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The method for preparing lithium hydroxide from spodumene and the method for removing sodium and potassium

A technology of lithium hydroxide and spodumene, which is applied in the field of lithium extraction from ore, can solve the problems of inability to remove sodium ions, and sodium cannot be removed by washing with water, and achieves the effect of realizing industrial clean production, low cost and simple method.

Active Publication Date: 2022-04-15
天齐锂业(江苏)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses salt lake lithium concentrate, the main component of which is lithium carbonate. The sodium in the ore can be removed by simple pulp washing, but in the extraction of lithium from the ore, the sodium in spodumene cannot be removed by water washing. , can only be leached by acid leaching after roasting
Therefore, this method is applied in the process of preparing lithium hydroxide from spodumene, and the sodium ion cannot be removed therein.

Method used

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  • The method for preparing lithium hydroxide from spodumene and the method for removing sodium and potassium
  • The method for preparing lithium hydroxide from spodumene and the method for removing sodium and potassium

Examples

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Embodiment 1

[0068] according to figure 1 The technological process in, prepares lithium hydroxide from spodumene. Specifically, spodumene concentrate (Li 2 O·Al 2 o 3 ·4Si 2 O) Calcining at 1100°C, the α-type spodumene is converted into β-type spodumene, the roasted material after conversion and roasting is cooled to below 100°C, and the roasted material is ground to 200 meshes, and the finely ground roasted material is combined with concentrated The sulfuric acid is mixed evenly at a molar ratio of 1:1.2, and then enters the acidification kiln for acidification at 240°C, and the acidification time is 2 hours. After acidification is completed, it is 1:3 to add leaching water by solid-liquid weight ratio, stirring reaction makes soluble lithium salt leaching, obtain lithium sulfate mother liquor, each ion content in the gained lithium sulfate mother liquor is shown in Table 1, and the data unit in Table 1 is g / L.

[0069] Table 1

[0070] Li 2 o

[0071] Raise the tempe...

Embodiment 2

[0076] With the pre-electrolyte in Example 1 as stock solution, carry out electrodialysis under different voltages, calculate its mobility, the mobility corresponding to the electrodialysis condition of different voltages and time is shown in Table 3.

[0077] Among them, mobility=(ion concentration in stock solution-ion concentration after dialysis) / ion concentration in stock solution*100%

[0078] table 3

[0079]

[0080] It can be seen from Table 3 that when the voltage is less than 10V, the sodium and potassium in the stock solution hardly migrate out, and when the voltage is above 20V, the migration rate of sodium and potassium is significantly higher than that of lithium, and with the increase of voltage , the sodium and potassium migration rate increases, but the lithium migration rate also increases accordingly. Therefore, in order to extract the lithium in the spodumene as much as possible while increasing the sodium and potassium migration rate, the preferred vol...

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Abstract

The invention relates to a method for preparing lithium hydroxide from spodumene and a method for removing sodium and potassium, and belongs to the technical field of lithium extraction from ores. The technical problem solved by the present invention is to provide a method for preparing lithium hydroxide from spodumene. The method comprises: 1) roasting; 2) acidifying, leaching, and filtering to obtain lithium sulfate mother liquor; 3) removing high-valent metal ions in lithium sulfate mother liquor; 4) removing sodium and potassium by electrodialysis; 5) bipolar membrane electrolysis to obtain hydrogen Lithium oxide solution and dilute sulfuric acid; 6) concentration and crystallization of lithium hydroxide solution to obtain lithium hydroxide product. The method of the present invention can produce battery-grade lithium hydroxide from spodumene, and the method is simple, environmentally friendly and low in cost; at the same time, it does not need to add caustic soda and freeze, and has high economic value. Before bipolar membrane electrolysis, ordinary electrodialysis removes sodium Potassium, so that the purity of the obtained product is greatly improved compared with the traditional method, and the direct crystallization can reach the battery level, which meets the trend and requirements of green and sustainable development.

Description

technical field [0001] The invention relates to a method for preparing lithium hydroxide from spodumene and a method for removing sodium and potassium, and belongs to the technical field of lithium extraction from ores. Background technique [0002] With the vigorous development of new energy vehicles, the market demand for lithium resources continues to grow. At present, lithium resources come from spodumene, lepidolite and other ore resources and salt lake brine resources, and there are different extraction methods according to their characteristics. However, from the perspective of lithium extraction technology, whether it is lithium extraction from ore or brine, the current main technology is the wet process, that is, lithium enters the solution together with other elements, and lithium is subsequently extracted from the solution. The solution systems that may be involved are chloride systems, sulfate systems, etc. The impurity ions involved mainly include high-valent m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/16C25B9/17
CPCC25B1/16
Inventor 周复严新星邓红云陈欣徐川张炳元杜明泽高宜宝涂明江邢武
Owner 天齐锂业(江苏)有限公司
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