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Method for separating calcium and magnesium in hydrochloric acid soluble salt system

A technology of dissolving salt and system, applied in the recycling field of calcium and magnesium resources, can solve the waste of valuable resources and other problems, achieve the effect of improving utilization rate, increasing added value, and easy operation

Inactive Publication Date: 2011-05-11
沈新财
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the properties of the two metal ions are very similar in all aspects, it is difficult to effectively separate them by traditional methods, resulting in the waste of a large amount of valuable resources.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0009] Example 1 of the present invention: Take 100ml of the leachate of rhodochrosite and waste hydrochloric acid, in which the calcium content is 57.7g / L, add 116.8g of oxalic acid, control the reaction temperature at 50°C, the stirring intensity at 250 rpm, and the pH value of the reaction process at 2.5. The reaction time is 1.5 hours; after the reaction, the calcium oxalate precipitate is obtained by suction filtration. The purity of the calcium oxalate product was 97.1%. Mg 2+ It remains in the leachate and can be recovered according to the situation or needs, such as adding sulfate for precipitation.

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Abstract

The invention discloses a method for separating calcium and magnesium in a hydrochloric acid soluble salt system. The method comprises the following steps of: adding oxalic acid which is 1.5 times of the molar content of calcium in a solution by controlling the reaction temperature to be 50 DEG C, the stirring strength to be 250 revolutions / minute, the pH value to be larger than or equal to 1 and the reaction time to be 1.5 hours; and filtering. Compared with the prior art, the method has the advantages of convenience for operation as well as simplicity and easiness for application, and not only successfully realizes the separation of calcium and magnesium in the hydrochloric acid soluble salt system, but also can be used for obtaining a calcium oxalate product with higher purity. By further recovering, a purer magnesium salt product can also be obtained, thus, with the method, the additional value of the product is increased, the waste is recycled and the utilization rate of resources is greatly improved.

Description

Technical field [0001] The invention relates to a method for separating calcium and magnesium in a hydrochloric acid salt solution system containing calcium and magnesium ions, and belongs to the technical field of recycling and utilization of calcium and magnesium resources. Background technique [0002] At present, with the development of the metallurgical industry, especially the development of hydrometallurgy, the industry has put forward new requirements for the recycling and reuse of some low-grade resources and waste resources from industrial production. For a long time, in many hydrometallurgical enterprises, the waste liquid contains a large amount of calcium and magnesium ions. Since the properties of the two metal ions are very similar in all aspects, it is difficult to effectively separate them using traditional methods, resulting in a lot of waste of valuable resources. Summary of the invention: [0003] The purpose of the present invention is to provide a method for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/46C02F1/58C22B26/20
CPCY02P10/20
Inventor 沈新财
Owner 沈新财
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