A method for extracting vanadium from vanadium-titanium magnetite

Abstract

The invention relates to a method for vanadium extraction from vanadium-titanium magnetite. According to the technical scheme of the method, vanadium-titanium magnetite concentrate is grinded till the vanadium-titanium magnetite concentrate with the particle size being smaller than 0.074 mm accounts for 60% or more by weight firstly, and vanadium-titanium magnetite concentrate powder is obtained; burdening is conducted according to the mass ratio of the vanadium-titanium magnetite concentrate powder to a roasting additive being 1:(0.04-0.06), even mixing is conducted, and a mixture is obtained; then the mixture is heated till the temperature is 850-1000 DEG C, heat preservation is conducted for 0.5-1.5 h, cooling is conducted till the temperature reaches the room temperature, and roasting slag is obtained; and then according to the liquid-solid ratio being (2-3):1 L / Kg, the roasting slag is placed into a sulfuric acid solution with the volume concentration being 10-20%, stirring is conducted, solid-liquid separation is conducted, and a leaching solution and leaching slag are obtained. The roasting additive is a mixture of sylvite and NaF, wherein the mass ratio of the sylvite to the NaF is 1:(0.5-2), and the sylvite is one or more of KCl, K2CO3, K2SO4 and KNO3. The method for vanadium extraction from the vanadium-titanium magnetite has the characteristics that the using quantity of the additive is low, the roasting temperature is low, the roasting time is short, the leaching rate of vanadium is high, and pollution is small.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction. Specifically relates to a method for extracting vanadium from vanadium-titanium magnetite. Background technique [0002] In the direct vanadium extraction process of vanadium-titanium magnetite concentrate, the roasting process is very important for the extraction of vanadium. The roasting process is essentially an oxidation process, that is, the trivalent vanadium in the ore is oxidized to tetravalent to pentavalent at high temperature. Vanadium, in order to fully destroy the structure of main vanadium-containing minerals such as vanadium magnetite and titanite, and at the same time promote the conversion of vanadium to form soluble salts, additives can be added during the roasting process. According to the different types of roasting additives, the direct vanadium extraction process of vanadium-titanium magnetite concentrate is divided into two main types: one is sodium roasting va...

AI Technical Summary

Problems solved by technology

[0010] Li Lanjie et al. (Li Lanjie, Zhang Zhang, Zheng Shili et al. Calcification roasting of vanadium-titanium magnetite and vanadium extraction by acid leaching [J]. Journal of Process Engineering, 2011, 11 (4): 574-576) showed that the use of CaCO 3 As a roasting additive, its dosage is 10wt%, roasting at 1200°C for 1h, the vanadium leaching rate is 72.1%, this method additive dosage is too large, the roasting temperature is too high, and the vanadium leaching rate is low

[0011] In summary, the existing vanadium-titanium magnetite roasting vanadium extraction method has problems such as large amount of roasting additives, high roasting temperature, long roasting time, low vanadium leaching rate and large pollution.