Device and method for extracting vanadium from vanadium slag in suspension state through oxidizing roasting-acid leaching

Abstract

The invention provides a device and method for extracting vanadium from vanadium slag in a suspension state through oxidizing roasting-acid leaching. A stock bin, a screw feeder and a primary cycloneseparator in the device communicate with a suspension calciner in sequence, and the top of the suspension calciner communicates with a secondary cyclone separator; a discharging port of the secondarycyclone separator is opposite to an agitation leaching tank; and the bottom of the suspension calciner is provided with a burner. The method comprises the steps of placing vanadium slag powder into the stock bin, and conveying the vanadium slag powder to the primary cyclone separator through the screw feeder; enabling primary solid materials to enter the suspension calciner upon completion of gas-solid separation under the effect of negative pressure; holding the primary solid materials in a suspension flow state through high temperature oxidizing gas, and heating the primary solid materials to generate oxidization reaction; then, enabling secondary solid materials to enter the agitation leaching tank upon completion of gas-solid separation in the secondary cyclone separator; and performing stirring, leaching, filtering and separation. The device provided by the invention is high in gas-solid mass transfer and heat transfer efficiency, and high temperature bonding of the materials is avoided effectively; and the calcination time can be shortened greatly; and the production efficiency of the device is improved, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical fields of mineral processing and metallurgy, in particular to a device and method for vanadium slag suspended oxidation roasting-acid leaching vanadium extraction. Background technique [0002] Vanadium slag is obtained by oxidative blowing of vanadium-containing molten iron in the process of vanadium extraction, or vanadium-containing iron concentrate is obtained by wet extraction of vanadium. The slag containing vanadium oxide is the raw material for the preparation of metal vanadium and vanadium alloys; The main chemical components in vanadium slag include FeO, SiO 2 , V 2 o 3 ,TiO 2 , MnO, CaO, C r2 o 3 and a small amount of Al 2 o 3 ; The traditional process of extracting vanadium in vanadium slag is basically based on sodium oxidation roasting-water leaching vanadium extraction process, with sodium salt (such as sodium chloride, sodium carbonate, etc.) ) will V 2 o 3 converted to water-soluble V 2...

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Problems solved by technology

[0002] Vanadium slag is obtained by oxidative blowing of vanadium-containing molten iron in the process of vanadium extraction, or vanadium-containing iron concentrate is obtained by wet extraction of vanadium. The slag containing vanadium oxide is the raw material for the preparation of metal vanadium and vanadium alloys; The main chemical components in vanadium slag include FeO, SiO 2 , V 2 o 3 ,TiO 2 , MnO, CaO, C r2 o 3 and a small amount of Al 2 o 3 ; The traditional process of extracting vanadium in vanadium slag is basically based on sodium oxidation roasting-water leaching vanadium extraction process, with sodium salt (such as sodium chloride, sodium carbonate, etc.) ) will V 2 o 3 converted to water-soluble V 2 o 5 , soak the roasted product in water to obtain a vanadium-containing leaching solution, and then add ammonium to make ammonium polyvanadate precipitation; but sodium roasting consumes a lot of energy, and will produce toxic and harmful HCl, Cl 2 and other toxic and harmful gases, causing serious environmental pollution; at the same time, the rotary kiln is prone to ring formation and sodium ions corrode the kiln lining during the high-temperature roasting process, which reduces the conversion rate of vanadium and affects production efficiency

[0003] In order to solve the pollution problem caused by sodium oxidation roasting, some scientific researchers try not to use sodium salt when roasting in rotary kiln, and directly use the oxygen in the air to make V 2 o 3 Oxidized to V 2 o 5 , and then extract vanadium by acid leaching; compared with sodium salt roasting, the environmental pollution problem is greatly reduced; but due to insufficient gas-solid contact during the roasting process of the rotary kiln, the oxidation conversion efficiency of vanadium is low; at the same time, local high temperature is also easy to cause ring formation in the rotary kiln , affecting production efficiency; therefore, the technology and equipment for oxidation and roasting of new vanadium slag still need to be developed

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