Product Description:

1.Name : Hafnium Metal

2.Appearance: Silver Grey Metal 

3.Formula: Hf

4.Formula weight: 178.49

5.CAS No.: 7440-58-6

6. EINECS No.: 231-166-4

7.Density: 13.31 g/cm3

8. Melting point: 2227°C

Applications:

1. Used as the cathode for X-ray tubes, and alloys of hafnium and tungsten or molybdenum are used as electrodes for high-voltage discharge tubes.

2. It is an important material in the atomic energy industry.

3. It can be used as Control rod and protection device of atomic reactor.

4.Hafnium powder can be used as a propellant for rockets.

5.Hafnium can be used as a getter in many inflation systems.

6.Hafnium is often used as an additive in hydraulic oil

7.Hafnium element is also used in nanoprocessors.

Preparation:

1. It can be prepared by magnesium reduction of Hafnium tetrachloride or thermal decomposition of Hafnium(IV) iodide. HfCl4 and K2HfF6 can also be used as raw materials. The process of electrolytic production in NaCl KCl HfCl4 or K2HfF6 melt is similar to that of electrolytic production of zirconium.

2. Hafnium coexists with zirconium, and there is no separate raw material for hafnium. The raw material for manufacturing hafnium is crude hafnium oxide separated during the process of manufacturing zirconium. Extract hafnium oxide using ion exchange resin, and then use the same method as zirconium to prepare metal hafnium from this hafnium oxide.

3. It can be prepared by co heating Hafnium tetrachloride (HfCl4) and sodium through reduction. [14]

4. The earliest methods for separating zirconium and hafnium were fractional crystallization of fluorinated complex salts and fractional precipitation of phosphates. These methods are cumbersome to operate and are limited to laboratory use. New technologies for separating zirconium and hafnium, such as fractionation distillation, solvent extraction, ion exchange, and fractionation adsorption, have emerged one after another, with solvent extraction being more practical. Two commonly used separation systems are Thiocyanate cyclohexanone system and tributyl phosphate nitric acid system. The products obtained by the above methods are all hafnium hydroxide, and pure hafnium oxide can be obtained by calcination. High purity hafnium can be obtained by ion exchange method.

In industry, the production of hafnium is often combined with Kroll process and Debor Aker process. Kroll process is to reduce Hafnium tetrachloride with magnesium:

2Mg+HfCl4- → 2MgCl2+Hf

The Debor Aker method, also known as the iodization method, is used to purify sponge like hafnium and obtain malleable metal hafnium.

Safety: 

Dangerous goods label: F, Xn, T

Hazard category code: 11-20/21/22-34-23/24/25

Safety instructions: 9-16-27-33-36-36/37/39-45-28

Dangerous goods transportation number: UN3178 4.1/PG3

WGKGermany:-

TECS number: MG4600000

TSCA: Yes

Customs Code: 38220000

Hazard level: 8

Packaging category: III

Toxic Substance Data: 7440-58-6 (Hazardous Substances Data)

Immediate threat to life and health Concentration: 50mgHf/m3

Storage and transportation characteristics: It should be stored in a ventilated and dry place. To prevent damage to the package, the package should be      kept sealed to prevent water and moisture.