Clean process method for extracting vanadium, chromium and iron from vanadium slag step by step

A process method, a technology for extracting vanadium tailings, applied in the field of chromium, high-efficiency step-by-step extraction of vanadium and iron in vanadium-chromium slag, and can solve the problem of high process energy consumption, incomplete separation of vanadium and chromium, unfavorable product conversion, etc. problem, to achieve the effect of high resource utilization

Inactive Publication Date: 2014-10-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

In this method, the extraction rate of vanadium and chromium is relatively high, but the separation of vanadium and chromium is not complete in this method, and there is a problem of mutual entrainment of vanadium and chromium products, and the resulting product is sodium orthovanadate, which is not conducive to subsequent product conversion
In addition, in this method, the sodium hydroxide reaction medium needs to be evaporated and concentrated before it can be recycled, and the process energy consumption is relatively high.
At the same time, iron, as a valuable element, has not been fully extracted

Method used

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  • Clean process method for extracting vanadium, chromium and iron from vanadium slag step by step

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The vanadium-chromium slag used contains V8.06wt.%, Cr1.35wt.%, TFe26.30wt%, Si7.03wt%, Ca1.07wt%, Mg1.68wt%.

[0042] (1) After 50g of vanadium-chromium slag is crushed, add calcium carbonate and vanadium slag to mix the ingredients, and control the calcium carbonate and V in the mixture. 2 o 5 The molar ratio is 0.8, and then oxidized at 800°C for 90 minutes to obtain calcined sand;

[0043] (2) Add calcined sand to 250g / L ammonium carbonate solution, react at 140°C for 2.5h, obtain ammonium metavanadate solution and vanadium extraction tailings after liquid-solid separation; obtain ammonium metavanadate after cooling and crystallizing the ammonium metavanadate solution crystal;

[0044] (3) Add vanadium extraction tailings and quicklime to 8% sodium hydroxide solution, and react at 90°C for 2h to selectively solidify silicon; After reacting for 6 hours, sodium chromate alkaline solution and chromium extraction tailings were obtained after liquid-solid separation; ...

Embodiment 2

[0048] The vanadium-chromium slag used contains V8.40wt.%, Cr1.37wt.%, TFe23.34wt%, Si6.46wt%, Ca1.05wt%, Mg1.75wt%.

[0049] (1) After 50g of vanadium-chromium slag is crushed, it is oxidized at 900°C for 60 minutes to obtain calcined sand;

[0050] (2) Add calcined sand to 300g / L ammonium bicarbonate solution, react at 150°C for 3 hours, and obtain ammonium metavanadate solution and vanadium extraction tailings after liquid-solid separation; ammonium metavanadate solution is obtained after cooling and crystallization of ammonium metavanadate solution Crystals, ammonium metavanadate crystals are thermally decomposed to produce vanadium pentoxide;

[0051] (3) Add vanadium extraction tailings and milk of lime to 12% sodium hydroxide solution, react at 70°C for 3 hours to selectively solidify silicon, and then perform liquid-solid separation. The filtrate is recycled for leaching of silicon, and hydrogen oxide is added to the filter residue Sodium is roasted at 900°C for 3 hou...

Embodiment 3

[0055] The vanadium-chromium slag used contains V7.31wt.%, Cr10.18wt.%, TFe35.30wt%, Si5.61wt%, Ca1.62wt%, Mg0.618wt%.

[0056] (1) After 50g of vanadium-chromium slag is crushed, it is oxidized at 900°C for 60 minutes to obtain calcined sand;

[0057] (2) Add calcined sand to 150g / L ammonium nitrate solution, react at 150°C for 3 hours, obtain ammonium metavanadate solution and vanadium extraction tailings after liquid-solid separation; obtain ammonium metavanadate crystals after cooling and crystallizing the ammonium metavanadate solution , ammonium metavanadate crystals are thermally decomposed to produce vanadium pentoxide;

[0058] (3) Add vanadium extraction tailings and quicklime to 15% sodium hydroxide solution, react at 60°C for 2h to selectively solidify silicon, then add sodium hydroxide to adjust the alkali concentration of the solution to 40%, and place it under an oxygen atmosphere at 260°C After reacting for 1.5 hours, sodium chromate alkaline solution and chro...

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Abstract

The invention relates to a clean process method for extracting vanadium, chromium and iron from vanadium slag step by step. The clean process method comprises the following steps of: selectively oxidizing the vanadium slag to obtain a roasted product; leaching the obtained roasted product by using a leaching agent to extract vanadium, carrying out liquid-solid separation to obtain vanadium-containing leach liquor and vanadium-extracted tailings, and carrying out product transformation on the vanadium-containing leach liquor to prepare vanadium series products; adding the obtained vanadium-extracted tailings and a silicon fixing agent to a sodium hydroxide solution, selectively fixing silicon, then oxidizing to extract chromium, then carrying out liquid-solid separation to obtain chromium-containing leach liquor and chromium-extracted tailings, and carrying out product transformation on the chromium-containing leach liquor to prepare chromium series products; mixing the chromium-extracted tailings with a reducing agent, and carrying out magnetizing roasting and magnetic separation to obtain silicon slag and ion concentrate powder / iron-enriched slag / reduced iron powder. The clean process method disclosed by the invention realizes the step-by-step extraction and high-efficiency separation of valuable components such as vanadium, chromium and iron which are contained in the vanadium slag, prevents the mutual entrainment of vanadium, chromium and iron products; in addition, the clean process method disclosed by the invention realizes the near zero discharge of waste water and the recycling of final slag and is clean and pollution-free.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of nonferrous metal metallurgy and resources, in particular to a cleaning process for efficiently extracting vanadium, chromium and iron in vanadium-chromium slag step by step. Background technique [0002] Vanadium and chromium are important strategic resources of the country, and the positions of vanadium and chromium products in the national economy are irreplaceable. Vanadium-containing minerals (such as vanadium-titanium magnetite) are smelted into molten iron, and the vanadium slag with high vanadium content obtained by oxidation blowing is the main raw material for extracting vanadium in my country at present. The composition of vanadium slag produced by blowing of different vanadium-containing minerals is quite different, but they all contain valuable metal components such as chromium and iron together with vanadium, which has high resource utilization value. Ordinary vanadium sla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/22C22B34/32
Inventor 徐红彬张红玲裴丽丽董玉明段少勇田颖雒敏婷付云枫张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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