Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1986-03-18
1988-11-15
Stoll, Robert L.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75121, 423 53, C22B 3436
Patent
active
047846887
ABSTRACT:
The scarcity of high grade tungsten ores obliges users to seek to recover it from scrap materials, but drill bits in particular pose special problems. Existing proposals to use acidic hydrogen peroxide to oxidize and solubilize tungsten are extremely inefficient in reagent consumption per unit tungsten recovered.
According to the present invention hydrogen peroxide can be used considerably more efficiently with sub-stoichiometric reagent addition per stage, especially from 6 to 12 stages and by the use of a small amount of certain promoters which it is believed may form a water-soluble complex with tungsten which provides an alternative route for tungsten dissolution. Many of the promoters are aromatic hydroxyl or amino acids such as 2-hydroxybenzoic acid, 2-aminobenzoic acid, 4-hydroxybenzene-phenol and its related oxidation products such as 1,4-benzoquinone. Also, certain aliphatic acids such as tartaric and epoxy succinic acid show some promotional activity.
REFERENCES:
patent: 3607236 (1971-09-01), Brooks
patent: 3635674 (1972-01-01), Shwayder
patent: 4533527 (1985-08-01), Farrell et al.
Artykbaerv et al. Uzhekskii Khimicheskii Jhurnal, 1979, (2), pp. 31-33 (translation cited).
Interox Chemicals Limited
Stoll Robert L.
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