Preparation technology of hafnium tetrafluoride

Abstract

The invention belongs to the field of fluoride preparation technology, and discloses a preparation technology of hafnium tetrafluoride. The preparation technology comprises the following steps of: (1) putting metal hafnium into hydrofluoric acid to obtain hafnium tetrafluoride solution; (2) putting the obtained hafnium tetrafluoride solution into a polytetrafluoroethylene container, and drying by distillation; and (3) putting the hafnium tetrafluoride obtained in the step (2) into a quartz tube, and carrying out dehydration under the conditions of vacuum and high temperature to obtain the solid hafnium tetrafluoride. The preparation technology has the advantages of being simple in operation, and low in oxygen content of the hafnium tetrafluoride.

Description

Technical field [0001] The invention belongs to the technical field of fluoride preparation, and specifically relates to a preparation process of hafnium tetrafluoride. Background technique [0002] 182 Hf is a long-lived nuclide that can provide relevant information about the formation of the moon and the earth, and is widely used to study nuclear astrophysics such as supernovae. In addition, 182 Hf is also a neutron flux monitoring agent, and the measurement of its related physicochemical constants can study the mobility of long-lived radionuclides, which is of great significance to the research on the safe disposal of nuclear waste. But in regular samples 182 The content of Hf is very low, and it is difficult to measure it with general methods. Accelerator mass spectrometry (AMS) has many advantages such as high measurement sensitivity, small sample amount, and short measurement time. 182 An effective method for high sensitivity measurement of Hf. Use AMS to 182 Hf is measure...

AI Technical Summary

Problems solved by technology

Among them, the dry fluorination method includes hydrogen fluoride (HF) gas fluorination method and ammonium bifluoride (NH 4 HF 2 ) fluorination method, the reaction temperature of hydrogen fluoride gas fluorination method is high, the operation risk is high, and tail gas recovery is difficult; NH 4 HF 2 The method is relatively safe to operate, and the specific method is to use HfO 2 React with ammonium bifluoride under heating conditions to obtain HfF 4 , but the fluorination reaction device is relatively complicated, and requires a high-temperature deamination step, and the oxygen content of the product varies greatly with the process conditions; the wet fluorination method mainly uses hydrofluoric acid precipitation to obtain HfF 4 , the operation is simple and safe, but there is no wet preparation of HfF in the open literature 4 detailed report of