Title: Effect of activator on kinetics of direct acid leaching of vanadium from clay vanadium ore
Abstract: According to the characteristics of clay vanadium ore, a novel process of no-grinding and no-roasting direct activated acid leaching under atmospheric pressure, was proposed. And in order to improve the leaching efficiency of vanadium, new activator MF was added into the acid leaching process. The effects of main factors on acid leaching of vanadium were investigated. The results showed that the leaching efficiency of vanadium reached 96.14 % under the conditions as follows: mass ratio of manganese oxide to fluoride is 25 %: 75 %, activator dosage of 3 %, H2SO4 dosage of 25 %, leaching temperature of 90 ℃, and leaching time of 5 h. The leaching kinetics was studied by using the unreacted shrinking core model. It was found that under the optimum conditions, the control step of direct activated acid leaching of vanadium from clay vanadium ore is changed from hybrid control to diffusion control, the apparent activation energy is reduced from 36.30 kJ‧mol−1 to 12.54 kJ∙mol−1, and the reaction order of sulfuric acid is reduced from 2.9033 to 1.8114.
Publication Year: 2021
Publication Date: 2021-10-19
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 21
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