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A kinetic study of the leaching of a low-grade niobium–tantalum ore by concentrated KOH solution under atmospheric pressure has been investigated. The effects of reaction temperature, KOH concentration, agitation speed, particle size and alkali-to-ore mass ratio on the dissolution rate of niobium were examined. It was found that the dissolution rate of niobium is significantly influenced by the temperature,...
The effect of pH, iron loading and initial dye concentration on the decolorization of C.I. Acid Orange 7 by zero-valent iron combined with ultrasound radiation was investigated. It was shown that the reduction of C.I. Acid Orange 7 was enhanced by ultrasound and the decolorization appeared to be a first order reaction. With the pH range of 3–7, iron loading range of 0.5–2.0gL −1 and initial...
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