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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[0018] Example 1
[0019] Take 50g of vanadium pentoxide grade of 0.86% stone ore, crush the stone ore to a particle size of less than 0.075mm, accounting for 60-95%, and leaching with a sulfuric acid solution with a mass fraction of 20%, liquid-solid ratio 4:1mL / g (the ratio of the volume of the sulfuric acid solution to the mass of the rock ore), the leaching temperature is 90℃, the leaching time is 6h, the ozone gas is continuously introduced during the leaching process, and the input amount is 8g / h. After the leaching is completed, filter and test the The vanadium content in the leaching slag, the leaching rate of vanadium is 92.25%, and the leaching rate is increased by 13.51% compared with the same leaching conditions without ozone. Using sodium chlorate as the oxidant under the same leaching conditions, the leaching rate was 91.21%. Therefore, under the condition of satisfying high leaching rate, the use of ozone oxidation also has the following advantages: no new impuri...
Example Embodiment
[0020] Example 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 leaching with a mass fraction of 18% sulfuric acid solution, liquid-solid ratio 4: 1 mL / g (the ratio of the volume of the sulfuric acid solution to the mass of the stone coal roasting slag), the leaching temperature is 90℃, the leaching time is 3h, the ozone gas is continuously introduced during the leaching process, and the input amount is 5g / h. After the leaching is completed, filter The content of vanadium in the leaching solution and leaching residue was tested. The leaching rate of vanadium was 93.25%. Compared with the same leaching conditions without ozone, the leaching rate increased by 10.24%. Using sodium chlorate as the oxidant under the same leaching conditions, the leaching rate was 93.10%.
Example Embodiment
[0022] Example 3
[0023] Take 50g of vanadium-containing weathered coal ore with a vanadium pentoxide grade of 0.95%, crush the weathered vanadium-containing coal ore to a particle size of less than 0.075mm, accounting for 60-95%, and use 8% NaOH solution for leaching , Liquid-to-solid ratio 4: 1 mL / g (the ratio of the volume of NaOH solution to the mass of weathered vanadium-bearing coal ore), the leaching temperature is 80℃, the leaching time is 4h, the ozone gas is continuously introduced during the leaching process, and the input amount is 8g / h, after the leaching is completed, filter and test the content of vanadium in the leaching solution and leaching residue. The vanadium leaching rate is 94.47%, which is 12.32% higher than that of the same leaching condition without ozone. Using sodium chlorate as the oxidant under the same leaching conditions, the leaching rate was 95.19%.
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