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Ore crushing→drying→ball milling→no salt roasting→acid leaching→solid-liquid separation→pretreatment→extraction stripping→precipitation→red vanadium pyrolysis→vanadium pentoxide.
After crushing, drying and ball milling of stone coal vanadium ore, the particle size of -60 mesh accounts for more than 80%. After calcination at 850-950 °C for 2~4 h, continuous stirring at 85 °C with 15% sulfuric acid ore, liquid solid product mass ratio (1~1.5):1, making vanadium in tetravalent and pentavalent forms. Transfer to the solution. After solid-liquid separation, the slag heap, and the oxidation solution was pretreated, and extracted with box-type vanadium countercurrent extraction stage 3, the extraction agent is isoamyl alcohol with N235 + + sulphonated coal oil, and then back-extracted with NaOH solution level 3, A vanadium-containing solution having a vanadium mass concentration of 80 to 90 g/L is obtained. The solution was heated and stirred with ammonium chloride, and filtered to obtain ammonium metavanadate. The ammonium metavanadate is calcined at 550 ° C to obtain a vanadium pentoxide product.
Second, the process principle and application
Calcination is one of the effective ways to destroy the mineral structure of stone coal vanadium ore. In some areas, the stone coal vanadium ore is calcined at 850-950 °C, which can remove most of the carbonaceous material and destroy the mineral lattice. During the calcination process, oxygen in the air directly oxidizes the trivalent vanadium to acid-soluble tetravalent vanadium and pentavalent vanadium, which can be transferred to the solution by acid leaching.
The salt-free roasting and acid leaching tests are carried out on the stone coal vanadium ore in Hunan Yiyang, Yueyang area and Shangnan County of Shaanxi. The total yield of vanadium is 55%~60%, and the production cost can be controlled at 5.8~70,000 yuan/t. . After the process wastewater is treated, it can be recycled. It does not add any additives during roasting, does not produce exhaust gas that seriously pollutes the environment, and has no pollution to the atmosphere. It is a clean production process.
First, the process