Method for extracting rubidium and cesium salts from mother liquor after extracting lithium from spodumene

A technology for extracting lithium mother liquor and spodumene, which is applied in the field of rubidium and cesium salt extraction, can solve the problems of large amount of mother liquor extraction, increased cost of rubidium and cesium extraction, and high toxicity of extractant, so as to achieve continuous operation, considerable economic benefits, The effect of low production cost

Inactive Publication Date: 2017-09-29
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent CN8610311A discloses a patent titled "Technical Scheme for Extracting Rubidium and Cesium from Weathering Crust of Acid-Alkaline Magmatic Rock or Ion-Exchange Rare Earth Ore". The extraction agent used is highly toxic and has poor selectivity, which limits its application to a large extent.
This method is to directly extract and recover rubidium and cesium from the solution, and the content of rubidium and cesium in the mother liquor of lithium extraction from spodumene is relatively small. the cost of

Method used

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  • Method for extracting rubidium and cesium salts from mother liquor after extracting lithium from spodumene
  • Method for extracting rubidium and cesium salts from mother liquor after extracting lithium from spodumene
  • Method for extracting rubidium and cesium salts from mother liquor after extracting lithium from spodumene

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Comparison scheme
Effect test

Embodiment 1

[0070] Step 1: Add sulfuric acid to neutralize the carbonate radical in the lithium mother liquor of spodumene (the components of the mother liquor are shown in Table 1), so that pH=2 in the mother liquor of lithium extraction. 15% ferric sulfate was added, kept at 90°C for 240min, and filtered to obtain the precipitate of rubidium and cesium salt. Then add the obtained rubidium and cesium salt precipitate into water according to the solid-liquid ratio of 1:5, then dissolve it with hydrochloric acid until clear, finally adjust the pH to 10 with NaOH, filter to separate the iron element from the rubidium and cesium, and obtain the rubidium and cesium salt solution at the solid-liquid ratio , the obtained rubidium and cesium salt solution can be used for extraction and separation in the subsequent section.

[0071] Step 2: Adjust the alkalinity of the rubidium and cesium salt solution obtained in the above step 1 to OH with sodium hydroxide - Concentration is 1.2mol / L, obtains ...

Embodiment 2

[0081] Step 1: Add hydrochloric acid to neutralize the carbonate radical in the mother liquor of spodumene for extracting lithium (the components of the mother liquor for extracting lithium are shown in Table 4), so that the pH of the solution is 3, and then the total amount of rubidium and cesium is calculated by an excess of 50%. Add tin tetrachloride, filter to obtain the precipitation of rubidium and cesium salt, then add the obtained rubidium and cesium salt precipitation into pure water at a solid-to-liquid ratio of 1:3, heat until the rubidium and cesium salt are completely dissolved, adjust the pH to 7 and filter to make the tin The element is separated from rubidium and cesium, and the obtained tin element can be purified and returned to the front for reuse. Obtain rubidium cesium salt solution.

[0082] Step 2: Adjust the alkalinity of the rubidium and cesium salt solution obtained in the above step 1 to OH with sodium hydroxide - Concentration is 1.5mol / L, obtains ...

Embodiment 3

[0092] Step 1: In the lithium mother liquor of spodumene (the components of the mother liquor are shown in Table 7), sulfuric acid is added to neutralize the carbonate radical, so that pH=1 in the mother liquor of lithium extraction, and then based on the total amount of rubidium and cesium, the excess Add 20% aluminum sulfate solution, stir well, then cool to 0°C to precipitate rubidium and cesium salt. Filtrate to obtain the precipitation of rubidium and cesium salt, then add the obtained rubidium and cesium salt precipitation into pure water according to the solid-liquid ratio of 1:5, heat until the rubidium and cesium salt are completely dissolved, adjust the pH to 5 with NaOH and filter to make the aluminum element and rubidium and cesium salt Separation to obtain rubidium cesium salt solution.

[0093] Step 2: Adjust the alkalinity of the rubidium and cesium salt solution obtained in the above step 1 to OH with sodium hydroxide - Concentration is 0.1mol / L, obtains feed ...

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Abstract

The invention relates to a recovery method for a mother liquor for extracting lithium from spodumene, in particular to a method for extracting rubidium and cesium salts from the mother liquor for extracting lithium from spodumene. The technical problem solved by the invention is to provide a low-cost method for extracting rubidium and cesium salts from spodumene lithium extraction mother liquor. In this method, the lithium-extracting mother liquor of spodumene is used as the raw material, the rubidium and cesium in the lithium-extracting mother liquor are first precipitated, and then the solid is enriched and then dissolved, extracted and separated, and the rubidium and cesium valuable metals are comprehensively utilized, reducing the rubidium and cesium The cost of cesium extraction can produce considerable economic benefits. Moreover, the method of the present invention can extract rubidium and cesium at low temperature and normal pressure. The operation is simple, the energy consumption is low, the processing capacity is large, it is beneficial to continuous operation, the production cost is low, the waste water is returned to the lithium extraction workshop, and the closed circuit cycle is realized in the process, and the waste water is zero discharged. .

Description

technical field [0001] The invention relates to a recovery method for a mother liquor for extracting lithium from spodumene, in particular to a method for extracting rubidium and cesium salts from the mother liquor for extracting lithium from spodumene. Background technique [0002] Rubidium and cesium have unique properties and have important uses in many fields. Not only have many traditional application fields, but also some new application fields have emerged, especially in some high-tech fields, rubidium and cesium have shown increasing more important role. Rubidium and cesium have been greatly developed in the past 10 years in traditional application fields such as electronic devices, catalysts, special glass, biochemistry and medicine; Rubidium and cesium have also shown strong vitality in new application fields such as cesium ion cloud communication. [0003] Recently, the industrial applications of rubidium and cesium in the world are mainly in high-tech fields su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/10
CPCC22B26/10
Inventor 曹乃珍邓红云姚丽高洁徐川廖仕英
Owner TIANQI LITHIUM CORP
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