Extended Arc Furnace
A new development in plasma furnace technology in which by relatively simple modifications a more or less conventional arc furnace can be made to produce a long stable plasma flame is described. A very promising application of this technique is in the steel melting as well as in direct reduction of fine iron ore, waste oxides, flotation concentrates, blast furnace dust, fly ash, mill scale, etc.
Treatment of ilmenite ore in a plasma jet reactor
Abstract Ground ilmenite ore was injected with hydrogen or ammonia into the arc- heated argon issuing from a plasma torch. Product collected either as consolidated or powder material on the walls of watercooled quench tubes and consisted of titanium-iron oxides of variable composition and metallic iron. Separation of titanium and Fe was most effective in the consolidated product where Ti contents ranged up to 49.5% (82.5% TiO2) and iron contents down to 12.1% (15.6% FeO). Unconsolidated material showed very little reaction of ilmenite but hematite contained in test samples was reduced. Resume Du minerai broye d'ilmenite a ete injecte avec de l'hydrogene ou de l'ammoniaque dans un arc produit par une torche a plasma a l'argon. Les produits recueillis, solides ou pulverulents, sur les parois refroidies a l'eau d'un tube de trempe etaient constitues d'oxydes de fer et de titane de diverses compositions et de fer metallique. La separation du fer et du titane etait plus efficace dans Ie produit solide pour leq...
Neuronal uptake inhibitors, nisoxetine and fluoxetine on rat vascular contractions.
The importance of neuronal uptake processes in rat arteries and veins was compared using nisoxetine and fluoxetine, selective inhibitors for neuronal uptake of norepinephrine and serotonin, respectively. Nisoxetine (10(-7) - 10(-5) M) increased the sensitivity to exogenous norepinephrine in the portal and mesenteric veins (10-fold) and in the mesenteric artery (2.5-fold). Responses to field stimulation were also increased afternisoxetine in all three vessels. After nisoxetine, aortic responses to norepinephrine were unaltered and in all tissues, serotonin-induced contractions were reduced. Fluoxetine did not potentiate responses to norepinephrine or to field stimulation except in the mesenteric vein where sensitivity to norepinephrine was increased and the relaxation rate after field stimulation was prolonged. Although serotonin has been detected in blood vessels, fluoxetine did not increase vascular responses to serotonin. These studies suggest that rat mesenteric veins have a highly sensitive neuronal uptake mechanism of norepinephrine. Furthermore, these data provide indirect evidence against a functionally important serotonergic uptake process in rat blood vessels and suggest that neuronal uptake of serotonin does not exert a major role in terminating the vascular action of this biogenic amine.