A method for separating tantalum and hafnium in tantalum and hafnium alloy slag

Abstract

The present invention discloses a method for separating tantalum and hafnium in tantalum-hafnium alloy slag. The method comprises: 1, uniformly mixing sodium carbonate and tantalum-hafnium alloy slag to obtain a calcining raw material; 2, calcining the calcining raw material for 1.5-3.5 h at a temperature of 1000-1200 DEG C under an oxygen atmosphere to obtain a calcined product, cooling, placing the cooled calcined product in concentrated sulfuric acid, heating to a temperature of 50-70 DEG C under stirring, and maintaining the temperature for 1-2 h to obtain a solid-liquid mixture; and 3, adding deionized water to the solid-liquid mixture, uniformly stirring, and filtering to obtain the filtrate and the filter residue so as to achieve the tantalum and hafnium separation. According to the present invention, the process that the tantalum-hafnium alloy slag is subjected to sodium carbonate calcination and concentrated sulfuric acid leaching is utilized to achieve the tantalum and hafnium separation purpose, such that the use of hydrofluoric acid is avoided, and advantages of good environmental protection and high separation efficiency are provided.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for separating tantalum and hafnium from tantalum and hafnium alloy slag. Background technique [0002] Both tantalum and hafnium are strategic metals and are widely used in the defense industry. Although China's tantalum and hafnium resources have certain reserves, but limited by factors such as grade, mining cost and mining technology, the annual domestic production of tantalum and hafnium is far from meeting domestic smelting needs. As a strategic reserve metal, the import of tantalum and hafnium is easily affected by the international situation. , and high-temperature alloy waste contains a considerable amount of valuable metal elements, if these valuable metal elements can be recovered, it will be of great significance for the utilization and application of strategic metals. For example, a patent containing tantalum is disclosed in CN 103834815 A...

AI Technical Summary

Problems solved by technology

Although China's tantalum and hafnium resources have certain reserves, but limited by factors such as grade, mining cost and mining technology, the annual domestic production of tantalum and hafnium is far from meeting domestic smelting needs. As a strategic reserve metal, the import of tantalum and hafnium is easily affected by the international situation. , and high-temperature alloy waste contains a considerable amount of valuable metal elements, if these valuable metal elements can be recovered, it will be of great significance for the utilization and application of strategic metals. For example, a patent containing tantalum is disclosed in CN 103834815 A A method for separating tungsten and tantalum from tungsten-rich slag, which separates tungsten and tantalum through the process of mixing sodium carbonate, sodium hydroxide and tantalum-containing tungsten-rich slag, roasting and water immersion, and the separation effect is better. In addition, conventional The separation process of acid leaching and roasting-water leaching can recycle the valuable metals such as nickel, cobalt, tungsten and molybdenum in superalloy waste, and there is still a certain amount of tantalum and hafnium in the remaining alloy slag. Most of the tantalum and hafnium alloy slag is downgraded, resulting in waste of resources and environmental pollution. If the tantalum and hafnium in it can be recycled, it can not only make up for our country's foreign dependence on tantalum and hafnium resources, protect our country's strategic needs, but also provide more tantalum and hafnium for our country Hafnium reserve