Method for preparing lanthanum metal by low-temperature electrodeposition by taking lanthanum chloride as raw material

Abstract

The invention relates to a method for preparing lanthanum metal by low-temperature electrodeposition by taking lanthanum chloride as a raw material and belongs to the field of low-temperature extraction of rare earth metals. The method for preparing the lanthanum metal by the low-temperature electrodeposition by taking the lanthanum chloride as the raw material comprises the following process steps: dissolving lithium nitrate in DMI at a room temperature to obtain a DMI electrolyte of the lithium nitrate, putting the DMI electrolyte of the lithium nitrate in an electrolytic bath, adding anhydrous lanthanum chloride, and stirring and mixing in the electrolytic bath to form a uniform transparent system, wherein the temperature of the whole system is controlled to be 25-75 DEG C, and the electrolytic voltage range is controlled to be from -2.0 to -2.5 V vs Ag; in the electrolytic process, adding the anhydrous lanthanum chloride in the electrolytic bath at set intervals and controlling themolar concentration of the lanthanum chloride to be + / -3 percent of the starting concentration. The method provided by the invention has the advantage that while the rare earth lanthanum metal is efficiently prepared, the energy consumption and the production cost are significantly reduced.

Description

technical field [0001] The invention relates to a method for preparing metal lanthanum by low-temperature electrodeposition using lanthanum chloride as a raw material, and belongs to the field of low-temperature extraction of rare earth metals. Background technique [0002] my country is rich in rare earth mineral resources and has superior ore-forming conditions, which can be called unique advantages. The proven reserves rank first in the world, providing a solid foundation for the development of my country's rare earth industry. In particular, the rare earth metal lanthanum is widely used, such as piezoelectric materials, electrothermal materials, pyroelectric materials, magnetoresistive materials, luminescent materials, hydrogen storage materials, optical glass, laser materials, various alloy materials, etc. It is also used in the preparation of catalysts for many organic chemical products, and lanthanum is also used in light-converting agricultural films. Abroad, scienti...

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 lanthanum 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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