Process of preparing atomic energy level zirconium dioxide and hafnium oxide by methyl isobutanone double solvent extraction method

Abstract

The methyl isobutyl ketone (MIBK) double solvent extraction process of prepare zirconia and hafnium oxide in atomic energy level includes the following steps: 1. preparing dilute hydrochloric acid solution, dilute sulfuric acid solution, ammonia solution, zirconium oxychloride solution and ammonium thiocyanate solution; setting in high-level tanks separately; washing and reverse extracting; 2. mixing MIBK and extractant and extracting; 3. mixing ammonium thiocyanate solution, zirconium oxychloride solution and dilute hydrochloric acid solution; and setting the mixture in high-level tank; 4. reaction through stirring for 8 hr and multistage extraction to obtain zirconium hydroxide solution and hafnium hydroxide solution; 5. depositing zirconium hydroxide and hafnium hydroxide in ammonia water; and 6. high temperature roasting zirconium hydroxide and hafnium hydroxide to obtain zirconia and hafnium oxide. The process has high separating effect and less environmental pollution.

Description

technical field [0001] The invention relates to a process for preparing atomic-level zirconia and hafnium oxide, in particular to a process for preparing atomic-level zirconia and hafnium oxide by methyl isobutyl ketone dual-solvent extraction. Background technique [0002] The chemical behaviors of zirconium and hafnium are very similar, and their aqueous solution chemistry is also very complex, and it is very difficult to separate each other. They are considered to be one of the most difficult elements in the periodic table to separate. The content of zirconium in the earth's crust is 162ppm, and that in seawater is 2.6×10 -5 ppm, more than copper, zinc and lead, but the distribution is very scattered. The main mineral is baddeleyite (ZrO 2 ) and zircon (ZrSiO 4 ). The content of hafnium in the earth's crust is 2.8ppm, and <0.008ppm in seawater. There is no independent mineral. It often coexists with zirconium in nature and exists in zirconium ore. Zircon and baddel...

AI Technical Summary

Problems solved by technology

At the end of the 1970s, the situation changed a lot. The outstanding disadvantage of the first process is that the solubility of MIBK in water is 1.7%, the loss in water is large, and thiocyanic acid is easy to decompose. At the same time, MIBK and thiocyanic acid are volatile and smell Unpleasant smell, worsening working environment

The disadvantages are: thiocyanic acid is unstable and easy to decompose to produce toxic substances, and MIBK has a high solubility in water, which is easy to cause environmental pollution and has the problem of sewage discharge

However, there are problems such as huge equipment, low extraction efficiency, and unstable system.