日本金属学会誌

J. Japan Inst. Metals, Vol. 28, No. 12 (1964),
pp. 788-794

On the Production of High Purity(Pure)Chromium by the Reduction of Chromium Trichloride(CrCl3)with Metallic Aluminium in Fused Salts (NaCl-KCl-CrCl3 System)

Hachie Sawamoto1, Takeo Oki1 and Jyun Tanikawa1

1Department of Metallurgy, Faculty of Engineering, Nagoya University, Nagoya

Abstract:

The production of high purity metallic chromium by the reduction of chromium trichloride (CrCl3) with metallic aluminium in fused salts (NaCl-KCl-CrCl3 system) was studied at 700°∼900°C. Final product obtained by this method consisted of two or three layers.

\hskip24pt In case of the two layers\hfill :1st; pure chromium crystals (large)
2nd; pure chromium crystals (small)
\hskip24pt In case of the three layers\hfill :1st; pure chromium crystals (large)
2nd; pure chromium crystals+intermetallic compounds or alloys
3rd; intermetallic compounds or alloys

Chromium crystals obtained were in the shape of a needle, plate or dendrite and are 99.99% or more in purity.
Mechanism of the reactions was considered as follows:
Optimum conditions were as follows:
NaCl:KCl (mol ratio)=2:1
Concentration of CrCl3 in fused salts=15∼20 wt%
Reaction temperature=850°C
Reaction time=depending on the amount of metallic aluminium used.
(1)CrCl3 (in fused salts)+Al(liquid)→Cr+AlCl3
Cr (partly)→Cr crystals
Cr (partly)+Al→(Al-Cr) alloy
(2)CrCl3 (in fused salts)+(Al-Cr)→Cr+AlCl3
Cr (partly)→Cr crystals
Cr (partly)+(Al-Cr)→(Al-Cr) alloy (high Cr)
(3)CrCl3 (in fused salts)+Al-Cr (high Cr)→Cr+AlCl3

After all, the authors succeeded in producing high purity chromium by means of the aluminium reduction of chromium trichloride in NaCl-KCl fused salts.


(Received 1964/6/10)

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