Torrefaction additive for extracting vanadium pentoxide from vanadium-containing bone coal and method of use thereof

Abstract

The invention relates to a roasted additive for extracting vanadic oxide in vanadium-containing stone coal and application method thereof. The additive comprises barium compounds, barium powder or barium solvent accounting for 0.5% to 2% of additive mine of vanadium-containing stone coal. The method comprises steps of mixing the barium compounds, or barium powder or barium solvent and vanadium-containing stone coal in an oven to roast, controlling temperature at 700 DEG C to 1050 DEG C, roasting for 6h to 72h, and leaching the obtained roasted dregs to recycle vanadium. Beneficial effect of the invention lies in that 1) the existing device is unnecessary to be changed or altered; 2) sulfur can be effectively fixed, and roasting smoke is less than national discharge standard; 3) furnace temperature range is wide and the furnace temperature is easy to control; 4) leaching ratio is high; 5) concentration of sulfuric acid for acid leaching is only 1% to 2%; 6) roasting dregs of the invention use dilute sulphuric acid to leach, thus acid consumption is low; 7) the cost of water leaching and acid leaching in the invention is low.

Description

technical field [0001] The invention relates to the metallurgical industry of rare nonferrous metals, in particular to a roasting additive for extracting vanadium pentoxide from stone coal containing vanadium and an application method thereof. Background technique [0002] The additive in the traditional roasting process for extracting vanadium pentoxide from vanadium-containing stone coal is sodium chloride with an ore content of 10.15%. Since sodium chloride decomposes to release chlorine gas and hydrogen chloride gas during high-temperature roasting, the roasting flue gas pollution is serious, and The recovery rate is low and the production cost is high, so it has been completely eliminated at present. The existing roasting additives for extracting vanadium pentoxide from vanadium-containing stone coal mainly include the following types: [0003] 1. Use 0.5-2% sodium chloride and 4% sodium carbonate as composite additives, and put it into flat kiln for roasting. The reco...

AI Technical Summary

Problems solved by technology

But this process has the following disadvantages: A. The furnace temperature is required to be at 750-850°C, the furnace temperature is strictly required, the furnace temperature range is narrow, it is difficult to control, the production index is unstable, and the highest conversion rate of industrial production can reach 90%. Only 50%; B, consumption of sulfuric acid is large, and every ton of refined vanadium needs 15-20 tons of sulfuric acid, and the production cost is high; C, when adding calcium carbonate or calcium hydroxide, it can effectively fix sulfur in the roasting process, but Calcium sulfate is soluble in acidic solution, which is extremely unfavorable to the follow-up process of vanadium extraction. First, calcium ions can be deposited on the resin to fill the pores of the resin, resulting in poor adsorption effect. Second, calcium sulfate can precipitate when the pH value is 2.5, resulting in alkali adjustment When the amount of slag is large and sulfuric acid is consumed

[0005] 3. Blank oxidation roasting sulfuric acid leaching vanadium extraction process, the roasting flue gas of this process is difficult to meet the standard, and the adaptability to ore is poor