| 摘要 |
<p>Pure chromium is made by fusion electrolysis using as electrolyte one or more alkali metal or alkaline earth metal chlorides, one component being sodium chloride, a mixture of chromium chlorides with an average valency between 2 and 3, and up to 5% of free sodium, and using as anode a ferro-chrome alloy and one of Cu, Ti, Si, Sn, or similar metal in the same electro-potential range. For example, an alloy of Fe 20%, Cr 49%, Si 30%. In the case of Cu and Ti the content of these is higher than in the case of Si, and in the case of Sn is lower. The alloy in the form of particles held in a basket, was held in molten NaCl containing 5% of chromium chlorides valency 2.05 and 0.1% of free sodium, maintained at 860 DEG C. The cathode was of stainless steel, and an inert atmosphere was used. The chromium metal crystals deposited contained 0.75% iron, and negligible interstitial impurities.</p> |
