Neodymium

Appearance

Silvery 

Melting Point

1024℃

Boiling Point

3100℃

Density

6800 kg/m3

Resistivity

64.0 microhm-cm @ 25 °C

Electronegativity

1.2 Paulings

 Fusion Heat

1.70 Cal/gm mole

Heat of Vaporization

69 K-Cal/gm atom at 3068 °C

Poisonby

(form) 0.281

Specific Heat

0.049 Cal/g/K @ 25 °C

Tensile Strength

N/A

Thermal Conductivity

0.165 W/cm/K @ 298.2 K

Thermal Expansion

6.89 g·cm3

Vickers Hardness

343MPa

Young's Modulus

(form) 41.4 GPa

Risk Statement

N/A

Dangerous Code

N/A

Preventive Instructions

P261-P305 + P351 + P338

Flash Point

N/A

Risk Code

22

Safety Statement

Not applicable

RTECS Number

QO8575000

Transportation Information

UN 3208 4.3/PG

WGK Germany

3

After separating neodymium from other rare earth elements through ion exchange or solvent extraction technology, metallic neodymium can be prepared by metal thermal reduction method. The lithium thermal reduction of rare earth chlorides is different from the Calciothermic reaction of rare earth chlorides. The reduction process of the former is carried out in the gas phase. The lithium thermal reduction reactor is divided into two heating zones, and the reduction and distillation processes are carried out in the same equipment. Anhydrous neodymium chloride is placed in the upper titanium reactor crucible (also known as NdCl3 Still room), the reducing agent lithium is placed in the lower crucible, and then the stainless steel reaction tank is vacuumized to 7Pa before heating. When the temperature reaches 1000 ℃, maintain for a certain period of time to allow NdCl3 vapor to fully react with lithium vapor, and the reduced metal neodymium solid particles fall into the lower crucible. After the reduction reaction is completed, only heat the lower crucible and distill LiCl into the upper crucible. The reduction reaction process usually takes about 10 hours. In order to produce relatively pure neodymium metal, the reducing agent lithium metal needs to use 99.97% high-purity lithium and anhydrous NdCl3 from secondary distillation.