A method for producing metal praseodymium by electrolysis of praseodymium chloride at low cost

Abstract

The invention relates to a low-cost method for producing praseodymium metal by electrolyzing praseodymium chloride, and belongs to the field of low-temperature extraction of rare earth metals. A low-cost method for electrolyzing praseodymium chloride to produce praseodymium metal, including the following process steps: dissolving lithium nitrate in DMI at room temperature to obtain a DMI electrolyte of lithium nitrate; placing the DMI electrolyte of lithium nitrate in an electrolytic tank , then add anhydrous praseodymium chloride to it, stir and mix in the electrolytic tank to form a uniform system, control the temperature of the entire system at 30~80℃, and the electrolysis voltage range -2.0~-2.4V vs Ag; during the electrolysis process , add anhydrous praseodymium chloride to the electrolytic cell at regular intervals, and control the molar concentration of praseodymium chloride to the initial concentration ±2%. The method of the present invention can significantly reduce energy consumption and production costs while efficiently preparing rare earth metal praseodymium.

Description

technical field [0001] The invention relates to a method for producing metal praseodymium by electrolyzing praseodymium chloride at low cost, and belongs to the field of low-temperature extraction of rare earth metals. Background technique [0002] Rare earth elements are known as "industrial vitamins" and have irreplaceable excellent magnetic, optical, and electrical properties, which play a huge role in improving product performance, increasing product varieties, and increasing production efficiency. Due to their great effect and low dosage, rare earths have become an important element to improve product structure, increase technological content, and promote technological progress in the industry. They are widely used in metallurgy, military, petrochemical, glass ceramics, agriculture, and new materials. In particular, praseodymium is widely used in architectural ceramics and daily-use ceramics. It is mixed with ceramic glaze to make colored glaze, and it can also be used ...

AI Technical Summary

Problems solved by technology

However, the synthesis process of ionic liquids is complicated, the exchange reaction is not complete, there are competing reactions and by-products, and the obtained products need to be purified and separated in multiple steps, which significantly increases the production cost of ionic liquids and the possibility of environmental pollution, and reduces the ionic liquid. green character of the liquid

However, the water content in the final ionic liquid product cannot be guaranteed, which seriously affects the process of preparing active metal praseodymium by ionic liquid electrodeposition.

In addition, conventional ionic liquids have a narrow electrochemical window and limited solubility for general chlorides (such as magnesium chloride, calcium chloride, rare earth chloride, etc.), and some common ionic liquids have high viscosity and are easy to absorb water in the air, so they are largely limited. Practical applications of ionic liquids

At present, the development of ionic liquids has a history of one hundred years, but it is limited to scientific research in the field of metal electrodeposition, and there is no large-scale practical application background

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