Method for comprehensively recovering aluminum and potassium from vanadium extraction from stone coal

A recovery method and stone coal technology, applied in the direction of improving process efficiency, can solve the problem of potassium not being effectively recovered and utilized, and achieve the effects of high recovery rate, avoiding ammonia nitrogen wastewater and reducing environmental pollution.

Inactive Publication Date: 2012-04-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, no matter which process is used to extract the vanadium in the sulfuric acid leaching solution of stone coal, ammonia nitrogen wastewater will be produced, and the potassium in the sulfuric acid leaching solution of stone coal has not been effectively recycled.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take V 2 o 5 4.86g / L, Al 13.46g / L, K 4.31g / L stone coal acid leaching solution 2000ml, first add calcium carbonate to adjust the pH value to 1.5, then add 60g K 2 CO 3 Make the aluminum and potassium in the solution crystallize and precipitate in the form of alum, filter; add hydrogen peroxide to the crystallization mother liquor to oxidize the ferrous iron in it to trivalent iron, trivalent vanadium and tetravalent vanadium to pentavalent vanadium, stir at 85°C for 0.5 hours , so that the vanadium and iron in the solution co-precipitate, filter to obtain vanadium-containing iron oxide and vanadium-precipitated solution; vanadium-containing ferric oxide alkali leaching recovers vanadium, and the solution after vanadium-precipitated is returned to the stone coal acid leaching process for recycling; crystallized alum According to the solid-liquid ratio of 1:3g / ml, add water and heat up to dissolve, stir and add potassium hydroxide to adjust the pH value of the solution...

Embodiment 2

[0025] Take V 2 o 5 3.61g / L, Al 11.35g / L, K 2.48g / L stone coal pickling solution 3000ml, add the potassium sulfate 75g that embodiment 1 obtains, make the aluminum and potassium in the solution crystallize out with the form of alum, filter ; Add CaCO to the liquid after crystallization 3 Neutralize until the pH value reaches 2.0 and filter, the filtrate is oxidized to ferric iron by ferrous iron and oxidized by trivalent vanadium and tetravalent vanadium to 1.2 times the stoichiometric number of pentavalent vanadium, add potassium permanganate to oxidize at room temperature for 6 hours, use The bisulfate-type strong base resin 201×7 absorbs and recovers vanadium; the liquid after delivery is returned to the stone coal acid leaching process for recycling; the crystallized alum is dissolved in water at a solid-liquid ratio of 1:5g / ml, and then stirred and added with potassium carbonate to adjust the temperature. The solution pH value is 7.0, filters and washes, and obtains al...

Embodiment 3

[0027] Take V 2 o 55.73g / L, Al 9.13g / L, K 6.52g / L stone coal acid leaching solution 1000ml, first add calcium carbonate to adjust the pH value to 1.6, then add the potassium carbonate 15g that embodiment 2 obtains, make the aluminum in the solution And potassium is crystallized in the form of alum, and filtered; the crystallization mother liquor is first added with iron powder to oxidize the ferric iron in the solution to ferrous iron, and then extracted with P204 to recover vanadium; the raffinate is returned to the stone coal acid leaching process for recycling; crystallization After the precipitated alum is dissolved in water at a solid-to-liquid ratio of 1: 4g / ml, add the potassium carbonate obtained in Example 2 to adjust the pH value of the solution to 72, filter and wash to obtain aluminum hydroxide and potassium sulfate solution; aluminum hydroxide is dissolved in hydrochloric acid Get aluminum chloride product; Potassium sulfate solution is transformed into 2 times o...

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Abstract

The invention discloses a method for comprehensively recovering aluminum and potassium from vanadium extraction from stone coal. The technical process of the method mainly comprises: crystallizing pentaphyllum potassium aluminum sulfate in sulfuric acid leachate of stone coal; purifying pentaphyllum potassium aluminum sulfate recrystals, or adding water to dissolve the pentaphyllum potassium aluminum sulfate recrystals and adding a potassium-containing pH regulator to precipitate aluminum; filtering to obtain aluminum hydroxide and a potassium sulfate or potassium hydrogen sulfate solution; transforming the potassium sulfate or potassium hydrogen sulfate solution by lime to obtain potassium carbonate or potassium hydroxide; and thus, effectively separating and recovering aluminum and potassium. The method has the advantages that: the aluminum and potassium recovery rates are high; the products are diversified; impurities harmful to the recycling of water from vanadium extraction from stone coal are not introduced in the aluminum and potassium recovery technical process; the reagent consumption is small; the production cost is low; environment pollution is avoided; and the like.

Description

technical field [0001] The invention relates to a comprehensive recovery method for extracting vanadium, aluminum and potassium from stone coal. Background technique [0002] Stone coal is a vanadium-containing polymetallic mineral resource, and stone coal usually contains SiO 2 50%-75%, Al 2 o 3 7%-17%, K 2 O2%-5%, V 2 o 5 0.15%-3.5%, including V 2 o 5 More than 0.8% stone coal can be mined as vanadium ore. Aluminum and potassium in stone coal are mainly composed of potassium mica (KAl 2 (Si 3 Al)O10(OH) 2 ) and illite (K(Al, V) 2 (Si,Al) 4 O10(OH) 2 ) form exists. The common process for extracting vanadium from stone coal is sulfuric acid leaching. At present, the processes for extracting vanadium from stone coal acid leaching solution include: [0003] 1) Stone coal sulfuric acid leaching solution → ammonium salt removal of aluminum → reduction → extraction → stripping → oxidation → ammonium salt precipitation of vanadium → calcination to obtain refined ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B21/00C22B34/22C22B26/10
CPCY02P10/20
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
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