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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.

Inactive Publication Date: 2013-03-20
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding the above-mentioned oxidants during the leaching process can increase the leaching rate of vanadium to a certain extent, but at the same time introduce new impurity ions, which will adversely affect the subsequent processes and increase the difficulty of wastewater treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides a leaching method for vanadium in vanadium-containing stone coal, wherein ozone gas is introduced during a process of leaching the vanadium-containing stone coal as an oxidant. According to the invention, ozone is used as an oxidant, as well as is good in oxidation effect and capable of increasing the leaching rate of vanadium by more than 10% compared with the method without introducing ozone; with the adoption of ozone oxidation, new foreign ions cannot be introduced, so that adverse effects on the subsequent processes are avoided; and the ozone decomposition product is oxygen, and is environment-friendly.

Description

technical field [0001] The invention relates to the technical field of vanadium extraction from stone coal, in particular to a method for leaching vanadium from vanadium-containing stone coal. Background technique [0002] Vanadium-bearing stone coal is a low-grade vanadium ore with huge reserves, which are distributed in more than ten provinces and cities in southern my country. Since the 1960s, my country has started to study the extraction of vanadium pentoxide from vanadium-containing stone coal, but the current technical level of vanadium extraction from stone coal is relatively backward, showing that the vanadium extraction process is easy to cause pollution and the total recovery rate of vanadium is low. The key step that affects the total recovery of vanadium is the leaching process. Improving the leaching rate is the premise of improving the recovery rate. Only by transferring vanadium into the solution to the maximum extent during the leaching process and recoverin...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B34/22
CPCY02P10/20
Inventor 何东升卢博池汝安吴海国徐志高叶从新姚金江秦芳卢东方
Owner WUHAN INSTITUTE OF TECHNOLOGY
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