Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1977-04-08
1978-09-19
Carter, Herbert T.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75121, 75123J, 423 62, 423 65, 423 68, 423508, 423 53, C22B 3422, C22C 3824, C01G 3100
Patent
active
041151100
ABSTRACT:
A process for recovering vanadium values from carbonaceous type vanadium ores, and vanadium scrap, such as vanadium contaminated spent catalyst, is disclosed which comprises roasting the vanadium containing material in air at a temperature less than about 600.degree. C to produce a material substantially devoid of organic matter, subjecting said roasted material to a further oxidizing roast in an oxygen atmosphere at a temperature of at least about 800.degree. C for a period sufficient to convert substantially all of the vanadium to the soluble form, leaching the calcine with a suitable dilute mineral acid or water at a pH of neutral to about 2 to recover vanadium values, precipitating vanadium values as iron vanadate from the leach solution with a soluble iron compound at a pH from neutral to about 1, and recovering ferrovanadium from the iron vanadate by a reduction vacuum smelting operation. The conversion of vanadium in the ore to the soluble form by the oxidizing roast is accomplished without the addition of an alkaline salt during calcining.
REFERENCES:
patent: 1651967 (1927-12-01), Reed
patent: 2749211 (1956-06-01), Lundquist
patent: 2920936 (1960-01-01), Dille et al.
Pyrih Roman Z.
Rickard Robert S.
Carter Herbert T.
Earth Sciences Inc.
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