Leaching method for vanadium in vanadium-containing stone coal
A vanadium ore and leaching technology, which is applied in the direction of improving process efficiency, can solve the problems of increasing the difficulty of wastewater treatment and adverse effects of subsequent processes, and achieves good oxidation effect, environmental friendliness, and improved vanadium leaching rate.
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Embodiment 1
[0019] Take 50g of stone coal ore with a vanadium pentoxide grade of 0.86%, crush the stone coal ore until the particle size is less than 0.075mm, accounting for 60~95%, use a sulfuric acid solution with a mass fraction of 20% for leaching, and the liquid-solid ratio is 4:1mL / g (ratio of the volume of sulfuric acid solution to the mass of stone coal ore), the leaching temperature is 90°C, and the leaching time is 6h. The vanadium content in the leaching slag, the vanadium leaching rate is 92.25%, compared with the same leaching conditions without ozone, the leaching rate is increased by 13.51%. Under the same leaching conditions, sodium chlorate was used as the oxidant, and the leaching rate was 91.21%. Therefore, under the condition of satisfying the high leaching rate, the use of ozone oxidation also has the following advantages: no new impurity ions will be introduced, and there will be no adverse effects on the subsequent process; the ozonolysis product is oxygen, which i...
Embodiment 2
[0021] Take 50g of stone coal roasting slag with a vanadium pentoxide grade of 1.15%, crush the stone coal roasting slag to a particle size of less than 0.075mm, accounting for 60-95%, and use a sulfuric acid solution with a mass fraction of 18% for leaching. The liquid-solid ratio is 4: 1 mL / g (the ratio of the volume of sulfuric acid solution to the mass of roasted stone coal slag), the leaching temperature is 90°C, the leaching time is 3h, and the ozone gas is continuously fed during the leaching process, and the amount of the inflow is 5g / h. After the leaching is completed, filter, The vanadium content in the leaching solution and leaching slag was tested chemically, and the leaching rate of vanadium was 93.25%, which was 10.24% higher than that under the same leaching conditions without ozone. Under the same leaching conditions, sodium chlorate was used as the oxidant, and the leaching rate was 93.10%.
Embodiment 3
[0023] Take 50g of vanadium-containing stone coal weathered ore with a vanadium pentoxide grade of 0.95%, crush the vanadium-containing stone coal weathered ore until the particle size is less than 0.075mm, accounting for 60~95%, and use a mass fraction of 8% NaOH solution for leaching , the liquid-solid ratio is 4:1 mL / g (the ratio of the volume of NaOH solution to the mass of vanadium-containing stone coal weathered ore), the leaching temperature is 80°C, the leaching time is 4h, and the ozone gas is continuously injected during the leaching process, and the amount of leaching is 8g / h, filter after the leaching is completed, test the vanadium content in the leach solution and leaching slag, the vanadium leaching rate is 94.47%, compared with the same leaching conditions without ozone, the leaching rate is increased by 12.32%. Under the same leaching conditions, sodium chlorate was used as the oxidant, and the leaching rate was 95.19%.
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