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Method for extracting vanadium by leaching vanadium-contained raw material roasting clinkers through ammonium phosphate

A technology for roasting clinker and ammonium phosphate is applied in the field of vanadium extraction from roasting clinker containing vanadium-containing raw materials and additives by leaching ammonium phosphate. The effect of simple equipment and short process flow

Active Publication Date: 2016-06-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] 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 phosphate A method for extracting vanadium from roasted clinker, the method has high vanadium selective leaching rate and less impurity element leaching, which is beneficial to the preparation of high-purity vanadium products; the ammonium phosphate solution used in the method is non-volatile, which can avoid a large amount of ammonia gas; 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

[0036] will V 2 o 5 11% vanadium slag mixed with calcium source, CaO / V 2 o 5 The molar ratio is 2.5, and the clinker obtained after calcification and roasting at 700°C for 4 hours is leached to extract vanadium in a solution containing 200g / L ammonium phosphate. The leaching temperature is 30°C, the leaching liquid-solid ratio is 20mL / g, and the leaching time is 5h. Vanadium tailings and vanadium-containing leachate.

[0037] 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 92%.

Embodiment 2

[0039] will V 2 o 5 15% mixed with calcium source, CaO / V 2 o 5 The molar ratio is 3, and the clinker obtained after calcification and roasting at 600°C for 5 hours is leached to extract vanadium in a solution containing 700g / L ammonium phosphate, the leaching temperature is 90°C, the leaching liquid-solid ratio is 5mL / g, and the leaching time is 0.5h. Vanadium tailings and vanadium-containing leachate.

[0040] 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 92%.

Embodiment 3

[0042] will V 2 o 5 20% vanadium slag mixed with calcium source, CaO / V 2 o 5 The molar ratio is 2, and the clinker obtained after calcification and roasting at 800°C for 3 hours is leached to extract vanadium in a solution containing 600g / L ammonium phosphate. The leaching temperature is 70°C, the leaching liquid-solid ratio is 10mL / g, and the leaching time is 1h. Tailings and vanadium-containing leachate.

[0043] 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 95%.

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Abstract

The invention provides a method for extracting vanadium by leaching vanadium-contained raw material roasting clinkers through ammonium phosphate. The method includes the steps that a mixture of a vanadium-contained raw material and an additive is roasted, and the vanadium-contained raw material clinkers are obtained; and the vanadium-contained raw material clinkers are leached in an ammonium phosphate solution to extract vanadium, and vanadium extracting tailings and a vanadium-contained leaching agent are obtained after solid-liquid separation is carried out. According to the method, the vanadium selective leaching efficiency is high and can reach more than 90%; meanwhile, leaching of impurity element is less, preparation of products with the high-purity vanadium is facilitated, and brine waste is avoided; the leaching agent-ammonium phosphate solution used in the method does not volatilize, and the problem of ammonia gas volatilization is avoided; and in addition, the leaching technological process of the method is simple, the operation environment is friendly, and the 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 by leaching vanadium-containing raw materials and additives with ammonium phosphate. Background technique [0002] The method for extracting vanadium from vanadium slag is roasting-water leaching method, among which sodium roasting-water leaching of vanadium-containing raw materials is the mainstream method for vanadium extraction. The basic principle of the sodium roasting process is based on Na 2 CO 3 , NaCl and Na 2 SO 4 Waiting for sodium salt as an additive, converting the low-valence vanadium in the vanadium-containing raw material into water-soluble sodium salt of pentavalent vanadium through high-temperature roasting (750-850°C), and then directly immersing the sodium-calci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/14C22B7/00C22B34/22
CPCC22B1/02C22B3/14C22B7/008C22B34/22C22B34/225Y02P10/20
Inventor 王少娜杜浩郑诗礼李猛刘彪张洋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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