Rhodium

Rh
45 102.9

Rhodium

Our Products Product Characteristics Application Areas Historical Background
Rhodium RdA-0,1,2
Producer Principal applications Product Form Packaging
KrastsvetmetThe Gulidov Krasnoyarsk Non-Ferrous Metals PlantGo to the glossary
  • Autocatalysts manufacturing industry
  • Chemical industry
  • Electrical industry
  • Glass industry
Powder

Description:
Plastic containers KT-2

Packing size:
301х241х130 mm

CHEMICAL COMPOSITION, %
Element State standard
12342-81
for RdA-0
State standard
12342-81
for RdA-1
State standard
12342-81
for RdA-2
Rh min99.9799.9599.90
Trace elements total (Pt, Pd, Ir, Ru)0.0100.0200.030
Au0.0020.0020.002
Ag0.0020.0030.003
Pb0.0040.0050.005
Fe0.0030.0100.020
Si0.0040.0050.005
Ba0.0040.0050.005
Mg0.0010.0030.003
Cu0.0030.0050.020
Ni0.0010.0020.005
Ti0.0040.0050.010
Al0.0020.0050.005
Sn0.0020.0020.002
Loss on ignition0.0100.0100.020
Physical and chemical characteristics
Latin name Rhodium (Rh)
Group in Mendeleev's periodic table VIII
Atomic number 45
Atomic weight 102.9055
Density 12.41 g/sm3
Melting point t 1,963 °С

Rhodium was discovered in 1804 by the British scientist William Hyde-Woollaston, immediately after his discovery of palladium.

Woollaston dissolved virgin platinum in aqua regia, and then neutralized the excess acid with caustic soda. From the neutralised solution, he precipitated platinum with ammonium chloride, and palladium with mercury cyanide. The filtrate, processed with muriatic acid to get rid of the excess of mercury cyanide, was boiled dry. The residue, after having been treated with alcohol, turned out to be a dark red powder of double sodium rhodium salts of muriatic acid (chloride). The metal is then easily obtained by heating this powder in a stream of hydrogen.

Rhodium gets its name from the Greek “rhodon”, which means “rose”, on account of the pinkish red colour of its salts.

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