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

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...

Examples

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%.

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...

Examples

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%.