Method for preparing high-purity hafnium by calcium in-situ distillation-deoxidation

Abstract

The invention discloses a method for preparing high-purity hafnium by calcium in-situ distillation-deoxidation, and belongs to the technical field of metal smelting. The method comprises the followingsteps: raw material systems A and calcium reducing agents are separately placed in a closed reaction container for heating under an inertia atmosphere; calcium in the calcium reducing agents is dissolved in a high-purity calcium gas form to enter fused salt of the raw material systems A to realize deoxidation of hafnium raw materials to prepare high-purity hafnium with an oxygen content of not more than 0.10 wt%; the raw material systems A are mixtures of the hafnium raw materials and anhydrous calcium chloride; the raw material systems A contain or dose not contain one or two of alkali metalhalides and alkaline earth metal halides; the hafnium raw materials are metal hafnium, hafnium alloys or hafnium oxide; the calcium reducing agents are metal calcium or calcium alloys; and separatedareas for separate placement are isolated and in gas-phase communication. The method is simple and feasible and excellent in oxygen removing effect, and can meet the use requirements in such fields ashigh-purity metal hafnium film plating materials, dielectric materials, high-temperature alloys and atomic energy industry.

Description

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AI Technical Summary

Benefits of technology

This patented new technique described in the patents allows for efficient separation of harmful elements such as iron and zinc without causing environmental concerns due to their presence. By combining these two substances together, it simplifies the treatment processes involved and eliminates any unnecessary waste. Additionally, the resulting highly pure crystal containing both Fe and Zn remains intact throughout the treated crude acid solution. Overall, this approach provides technical benefits over current methods like calcining/drying techniques and hydrothermal decomposition technologies.

Problems solved by technology

This technical problem addressed in this patented text relating to the challenge faced when producing highly refined or chemically stable nioblunium dioxides called zirconium dioxyde ("ZDO"), particularly if they contain significant amounts of iron impurity like hydroxyanions found within their crystal structure. Existing techniques involve either extractable solvents or expensive processes involving ion exchange resin columns. These solutions require complicated equipment and consume too much time on account of dissolved metal impursites.

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