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Method for leaching extracted vanadium from vanadium-containing raw material roasted clinker through ammonium oxalate

A technology for roasting clinker and ammonium oxalate, applied in the field of vanadium chemical industry and metallurgy, can solve the problems of short process flow, poor operating environment, loss of leaching agent, etc., and achieve the effects of short process flow, low production cost and less impurity content

Inactive Publication Date: 2016-07-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the technical problems of ammonium salt loss caused by a large amount of ammonia volatilization in the leaching process of the existing vanadium slag oxidative roasting ammonium leaching technology, poor operating environment and serious loss of leaching agent, the purpose of the present invention is to provide a vanadium-containing raw material leached by ammonium oxalate A method for extracting vanadium from roasted clinker, the method has a high vanadium selective leaching rate and less impurity element leaching, which is beneficial to the preparation of high-purity vanadium products; the ammonium oxalate solution used in the method is non-volatile, which can avoid a large amount of ammonia; and, the method has a short technical process, simple leaching process, environmental friendliness, and low production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] will V 2 o 5 Vanadium slag with a content of 10.5% according to CaO / V 2 o 5 The molar ratio is 2, and the clinker obtained after calcification and roasting at 600°C for 4 hours is leached to extract vanadium in ammonium oxalate solution. The leaching temperature is 30°C, the leaching liquid-solid ratio is 10mL / g, and the leaching time is 2h. Tailings and vanadium-containing leachate. Wherein, the NH in the ammonium oxalate solution 4 + The mass concentration is 100g / L, C 2 o 4 2- The mass concentration is 400g / L; The ammonium oxalate solution is obtained by directly dissolving ammonium oxalate solid in a solvent.

[0035] The leached slag was washed, dried, weighed and analyzed for the vanadium content of the residue. It was tested that the vanadium transfer leaching rate was 91%.

Embodiment 2

[0037] will V 2 o 5 Vanadium slag with a content of 14.7% according to CaO / V 2 o 5 The molar ratio is 2.5, and the clinker ammonium oxalate solution obtained by calcification and roasting at 700°C for 5 hours is leached to extract vanadium. The leaching temperature is 75°C, the leaching liquid-solid ratio is 5mL / g, and the leaching time is 1h. vanadium-containing leachate. Wherein, the NH in the ammonium oxalate solution 4 + The mass concentration is 200g / L, C 2 o 4 2- The mass concentration is 200g / L; the ammonium oxalate solution is obtained by directly dissolving ammonium oxalate solid in a solvent.

[0038] The leached slag was washed, dried, weighed and analyzed for the vanadium content of the residue. It was tested that the vanadium transfer leaching rate was 90%.

Embodiment 3

[0040] will V 2 o 5 Vanadium slag with 20% content according to CaO / V 2 o 5 The molar ratio is 3, and the clinker obtained after calcification and roasting at 1000°C for 0.5h is leached to extract vanadium in ammonium oxalate solution. The leaching temperature is 20°C, the leaching liquid-solid ratio is 20mL / g, and the leaching time is 6h. Tailings and vanadium-containing leachate. Wherein, the NH in the ammonium oxalate solution 4 + The mass concentration is 150g / L, C 2 o 4 2- The mass concentration is 200g / L; the ammonium oxalate solution is obtained by directly dissolving ammonium oxalate solid in a solvent.

[0041] The leached slag was washed, dried, weighed and analyzed for the vanadium content of the residue. It was tested that the vanadium transfer leaching rate was 93%.

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Abstract

The invention provides a method for leaching extracted vanadium from vanadium-containing raw material roasted clinker through ammonium oxalate. The method includes the steps that a mixture of a vanadium-containing raw material and an additive is roasted to obtain a vanadium-containing raw material clinker; the vanadium-containing raw material clinker leaches extracted vanadium in an ammonium oxalate solution, and extracted vanadium tailings and a vanadium-containing leaching solution are obtained after solid-liquid separation. The method is high in vanadium selective leaching rate which can reach 90% or above, the content of vanadium-containing solution impurities obtained after leaching is small, the acidity and the alkalinity are proper, the purification and impurity removal process can be simplified or omitted, and subsequent vanadium precipitation and preparation of high-purity vanadium products are facilitated. No salt-containing waste water is generated. A leaching agent, namely the ammonium oxalate solution, used in the method does not volatilize, and the problem of ammonia volatilization is avoided. Besides, the leaching technology is simple in process, the method is friendly to the operation environment, and production cost is low.

Description

technical field [0001] The invention belongs to the technical field of vanadium chemical industry and metallurgy, and relates to a method for extracting vanadium from clinker after roasting vanadium-containing raw materials, in particular to a method for extracting vanadium from roasted clinker of vanadium-containing raw materials and additives leached by ammonium oxalate. Background technique [0002] The traditional method for extracting vanadium from vanadium slag is the roasting-water leaching method to extract vanadium, among which the vanadium slag sodium roasting-water leaching vanadium extraction is the mainstream method for vanadium extraction. The method is to use sodium salt additives (such as table salt, Glauber's salt, soda ash, etc.) to help trivalent vanadium oxidize to pentavalent vanadium and convert it into soluble vanadate. The sodium roasting process needs to consume a large amount of sodium salt, and the recovery rate of vanadium is low. The recovery rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/14C22B7/00C22B34/22
CPCC22B1/02C22B3/14C22B7/008C22B34/22
Inventor 郑诗礼杜浩李猛王少娜刘彪张洋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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