Method for preparing vanadyl sulfate through solid phase roasting
A technology of vanadyl sulfate and vanadyl sulfate solution, which is applied in the field of vanadium batteries, can solve the problems of high production cost, high power consumption, and consumption, and achieve the effects of simple equipment, mild reaction conditions, and easy operation
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Embodiment 1
[0057] (1) get the vanadium pentoxide of 150g purity ≥ 95%, mix by the sulfuric acid of vanadium pentoxide, concentration ≥ 98wt% and sulfur in molar ratio 1:1.5:2.5, place in airtight container after mixing;
[0058] (2) Place the airtight container in a temperature-controllable heating furnace and heat it up to 250°C for roasting for 1 hour of reduction reaction;
[0059] (3) After the reduction reaction finishes, the reactant in the closed container is dissolved in 500 mL of water at a temperature of 80° C., stirred, and filtered to obtain a vanadyl sulfate solution with a concentration of 179.2 g / L (ie, a molar concentration of 3.45 mol / L);
[0060] (4) Add vanadyl sulfate crystals to the vanadyl sulfate solution obtained in step (3), and naturally cool to 20° C. to obtain vanadyl sulfate crystals with a particle size of 0.15 mm.
[0061] The purity of the vanadyl sulfate crystal prepared by the present embodiment is 98.9wt%, and the yield is 95%; the obtained vanadyl sulf...
Embodiment 2
[0063] In addition to vanadium pentoxide in step (1), by vanadium pentoxide, concentration ≥ 98wt% sulfuric acid and sulfur molar ratio 1:2.5:1.5; In step (2), the reduction roasting temperature is 200 ℃; in step (3) The reactants were dissolved in water at 70° C. to prepare a vanadyl sulfate solution with a molar concentration of 2 mol / L, and the amounts of other materials and the operating process were the same as those in Example 1.
[0064] The particle size of the vanadyl sulfate crystal prepared in this embodiment is 70 μm, the purity is 99.1wt%, and the yield is 90.5%; the obtained vanadyl sulfate crystal is made into an electrolyte, and the utilization rate of the electrolyte in a vanadium battery is 92%, the current efficiency is 91%, and the energy efficiency is 81.3%.
Embodiment 3
[0066] In addition to vanadium pentoxide in step (1), by vanadium pentoxide, concentration ≥ 98wt% sulfuric acid and sulfur molar ratio 1:4:3; In step (2), the reduction roasting temperature is 100 ℃; in step (3) The reactants were dissolved in water at 100° C. to prepare a vanadyl sulfate solution with a molar concentration of 6 mol / L, and the amounts of other materials and the operating process were the same as those in Example 1.
[0067] The particle size of the vanadyl sulfate crystal prepared in this embodiment is 0.9mm, the purity is 99.3wt%, and the yield is 92.5%; It is 92.6%, the current efficiency is 92%, and the energy efficiency is 83%.
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