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Method for extracting vanadium from vanadium-containing highly concentrated sulfuric acid solution and application of extracting agent

A sulfuric acid solution, high-concentration technology, applied in the field of wet extraction of vanadium and vanadium, can solve the problems of huge consumption of acid and alkali, high consumption of sulfuric acid, complicated process, etc. simple effect

Inactive Publication Date: 2013-01-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low vanadium content of stone coal mines, the consumption of sulfuric acid per ton of vanadium pentoxide product is as high as 20-40 tons, and one-third of the excess sulfuric acid remains in the leaching solution and is neutralized during the neutralization process. The reduction process also needs to consume a large amount of alkali (limestone, ammonia water or sodium hydroxide) and reducing agent (iron filings, sodium thiosulfate, etc.), and the stripping liquid also needs to be oxidized, so the process is complicated and the consumption of acid and alkali is huge. high product cost

Method used

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  • Method for extracting vanadium from vanadium-containing highly concentrated sulfuric acid solution and application of extracting agent
  • Method for extracting vanadium from vanadium-containing highly concentrated sulfuric acid solution and application of extracting agent
  • Method for extracting vanadium from vanadium-containing highly concentrated sulfuric acid solution and application of extracting agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] according to figure 1 The process flow is operated;

[0045] The feed liquid is stone coal mine sulfuric acid leaching solution, containing 5.75g / L of vanadium and 1.5mol / L of free sulfuric acid;

[0046] The organic phase is 10% extractant + sulfonated kerosene;

[0047] First, add hydrogen peroxide to the leaching solution at room temperature, add 8 mL of 22% hydrogen peroxide for each leaching solution with a potential of 445 mV, stir for 30 minutes, and finally the potential of the material solution is 850 mV;

[0048] A separatory funnel was used for single-stage extraction, the extraction ratio (O / A) = 1 / 2, the extraction time was 10 minutes, the temperature was 30°C, and the phase separation was 3 minutes. The results are shown in Table 1.

[0049] Table 1 Extraction experiment results

[0050] Element

[0051] The results show that during the extraction process, single-stage extraction of vanadium can achieve an extraction rate of 83.8%, and almost...

Embodiment 2

[0053] according to figure 1 The process flow is operated;

[0054] The feed liquid is sulfuric acid leaching solution of stone coal mine, containing vanadium 7.00g / L, [H + ] is 1.55mol / L;

[0055] The organic phase is 10% extractant + sulfonated kerosene;

[0056] First, add different amounts of sodium chlorate to the leaching solution at room temperature, stir for 30 minutes, and obtain four kinds of oxidizing feed solutions with potentials of 780mV, 960mV, 1070mV, and 1140mV respectively;

[0057] A separatory funnel was used for single-stage extraction, the extraction ratio (O / A)=1 / 1, the extraction time was 10 minutes, the temperature was 30°C, and the phase separation was 10 minutes. The results are shown in Table 2.

[0058] Extraction experiment results under different material-liquid potential conditions in table 2

[0059] electric potential

[0060] The results show that when the potential of the vanadium-containing material liquid is above 850mV, the ex...

Embodiment 3

[0062] according to figure 1 The process flow is operated;

[0063] The feed liquid is sulfuric acid leaching solution of stone coal mine, containing 7.00g / L of vanadium and potential of 445mV;

[0064] The organic phase is 10% extractant + sulfonated kerosene;

[0065] First add sodium chlorate to the leaching solution at room temperature, add 3.3g sodium chlorate per liter of feed solution, adjust the potential to 885mV, and then add different amounts of solid sodium hydroxide or 98% sulfuric acid to obtain 7 kinds of different acidity Liquid;

[0066] Separated funnels were used for single-stage extraction, the extraction ratio (O / A) = 1 / 2, the extraction time was 10 minutes, the temperature was 30°C, and the phase separation was 10 minutes. The results are shown in Table 3.

[0067] Table 3 Extraction experiment results under different feed liquid acidity conditions

[0068] Acidity [H + ] (mol / L)

[0069] Extraction rate of magnesium (%)

[0070]...

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Abstract

Disclosed are a method for extracting vanadium from vanadium-containing highly concentrated sulfuric acid solution and application of extracting agent. Stone coal or stone coal roasting material is leached by sulfuric acid to obtain vanadium-containing sulfuric acid solution. Low valence vanadium in the vanadium-containing solution is oxidized into pentavalent vanadium, and the pentavalent vanadium is subjected to liquid-liquid extraction to obtain vanadium in the solution. Loaded organic phase is subjected to reverse extraction by NaOH solution to obtain sodium vanadate solution. The process flow is as followed. The method has the advantages that the vanadium in the sulfuric acid leachate can be directly extracted without neutralizing the sulfuric acid leachate, acid-containing raffinate is returned for leaching to recycle sulfuric acid in the raffinate, and consumption of the sulfuric acid and neutralizer is lowered; the steps of neutralizing, wastewater treatment and the like are reduced, and production cost is reduced; separation of the vanadium from the impurities such as Fe, Al, Ca, Mg, As and Cr is achieved during extracting, strip liquor is directly deposited to obtain metavanadate without purification, and vanadium pentoxide more than 98.5% in purity can be obtained by calcining; the recovery rate of vanadium from the leachate and the strip liquor is larger than 99%, and technical and economic indicators are superior.

Description

Technical field: [0001] The invention relates to the extraction of vanadium from vanadium-containing materials, especially the field of wet extraction of vanadium from vanadium-containing stone coal mines. Background technique: [0002] Stone coal is a unique vanadium resource in my country with extremely rich reserves, and it is also an important resource for vanadium extraction in my country. [0003] There are many methods for extracting vanadium from stone coal, mainly including (i) sodium roasting-water immersion process; (ii) blank roasting-acid leaching-ion exchange (P204 extraction or N235 extraction) process; (iii) Direct acid leaching - P204 extraction process; (iv) blank roasting - alkali leaching - ion exchange process, etc. Due to the sodium roasting-water immersion process has been banned in most parts of the country due to environmental protection issues, it is gradually being eliminated. The blank roasting-alkali leaching-ion exchange process is currently on...

Claims

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Application Information

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IPC IPC(8): C22B3/30C22B34/22
CPCY02P10/20
Inventor 李青刚曾理肖连生许亮齐兆树莫兴德张贵清曹佐英
Owner CENT SOUTH UNIV
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