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A method for extracting vanadium by ammonification with low liquid-solid ratio

A technology of liquid-solid ratio and ammonization, which is applied in the field of extracting vanadium and chromium from vanadium slag at low temperature and normal pressure, can solve the problems of large ammonium salt consumption and ammonia volatilization, and achieve simple separation operation, less ammonia volatilization, and ammonium The effect of using a small amount of salt

Active Publication Date: 2018-08-07
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] The principle of this method is: in order to solve the problems of large ammonium salt consumption and serious ammonia volatilization in conventional high liquid-solid ratio stirring leaching, etc., make full use of the low-temperature reaction characteristics of ammonium leaching to realize low liquid-solid ratio ammonium leaching of vanadium slag clinker

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] will V 2 o 5 The clinker obtained by blank roasting vanadium slag with a content of 8.8% at 850°C is mixed with ammonium bicarbonate and water to form a slurry, wherein the amount of ammonium bicarbonate added is 0.1 times the mass of vanadium slag, and the addition of water The amount is 0.15 times of the mass of vanadium slag. The mixed slurry was stirred and reacted at 15°C for 4 hours, and then 60°C hot liquid was added to the mixed slurry for leaching, the hot liquid V 2 o 5 The concentration is 0g / L, the leaching time is 4h, the V in the solution after leaching 2 o 5 The concentration is 5g / L. The ammonium metavanadate solution was obtained after liquid-solid separation of the leaching liquid, and the ammonium metavanadate crystal was obtained by cooling and crystallizing the ammonium metavanadate solution at 10°C for 5 hours, and the mother liquor and crystals were obtained after liquid-solid separation. 2 o 5 The concentration is 2g / L, and the ammonium me...

Embodiment 2

[0030] will V 2 o 5 The clinker obtained by blank roasting vanadium slag with a content of 12.1% at 950°C is mixed with ammonium carbonate and water to form a slurry, wherein the addition of ammonium carbonate is 0.17 times the mass of vanadium slag, and the addition of water is 0.28 times the mass of vanadium slag. The mixed slurry was stirred and reacted at 45°C for 4 hours, then 85°C hot liquid was added to the mixed slurry for leaching, the hot liquid V 2 o 5The concentration is 0g / L, the leaching time is 2h, V in the solution after leaching 2 o 5 The concentration is 35g / L. The ammonium metavanadate solution is obtained after liquid-solid separation of the leaching solution, and the ammonium metavanadate crystal is obtained by cooling and crystallizing the ammonium metavanadate solution at 40°C for 10 hours, and the mother liquor and crystals are obtained after liquid-solid separation. 2 o 5 The concentration is 6g / L, and the ammonium metavanadate crystal is calcin...

Embodiment 3

[0032] will V 2 o 5 The clinker obtained by blank roasting vanadium slag with a content of 15% at 1000°C is mixed with ammonium bicarbonate and water to form a slurry, wherein the amount of ammonium bicarbonate added is 0.75 times the mass of vanadium slag, and the addition of water The amount is 0.5 times the mass of vanadium slag. The mixed slurry was mixed and stirred at 60°C for 3 hours, and then 100°C hot liquid was added to the mixed slurry for leaching. The hot liquid V 2 o 5 The concentration is 5g / L, the leaching time is 0.5h, V in the solution after leaching 2 o 5 The concentration is 50g / L. The ammonium metavanadate solution was obtained after liquid-solid separation of the leaching liquid, and the ammonium metavanadate crystal was obtained by cooling and crystallizing the ammonium metavanadate solution at 60°C for 8 hours, and the mother liquor and crystals were obtained after liquid-solid separation. 2 o 5 The concentration is 15g / L, and the ammonium metava...

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Abstract

The invention relates to the field of vanadium slag wet process metallurgy and vanadium chemical industry, in particular to a method for vanadium extracting through low liquid-solid-ratio ammonification. According to the method, after raw materials containing vanadium is roasted, clinkers, water and ammonium salt are mixed according to a certain proportion; materials with a low liquid-solid ratio are formed and subjected to the low-temperature ammonification reaction, the vanadium in the clinkers reacts with the ammonium salt to form ammonium metavanadate, and the ammonium metavanadate formed at the low temperature exists in mixed slurry in a crystalline mode; after the mixed slurry is subjected to hydrotherm dissolution, a solution rich in the ammonium metavanadate is obtained; and after slurry filtering, filtrate cooling and crystallizing and separating and ammonium vanadate roasting, vanadium pentoxide products are obtained. Compared with a conventional vanadium extracting through ammonification, according to the method for vanadium extracting through low liquid-solid-ratio ammonification, the using quantity of the water and the ammonium salt are greatly reduced in the ammonification process, and volatilization of ammonia gas is obviously inhibited; and the slurry can be directly subjected to hydrotherm leaching to obtain the ammonium metavanadate solution after ammonification, the process of vanadium extracting through ammonification is greatly simplified, the process is easy to operate and control, efficient and clean extracting of the vanadium can be achieved, and the extracting rate of the vanadium reaches 90% or more.

Description

technical field [0001] The invention relates to the fields of vanadium slag hydrometallurgy and vanadium chemical industry, in particular to a method for extracting vanadium and chromium in vanadium slag at low temperature and normal pressure. Background technique [0002] The traditional vanadium extraction method of vanadium-titanium magnetite, vanadium slag, stone coal and other vanadium-containing raw materials is roasting~water leaching / acid leaching to extract vanadium, 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, 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-calcined roasted product in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B34/22C22B34/32
CPCC22B7/04C22B34/22C22B34/32Y02P10/20
Inventor 郑诗礼杜浩刘彪王少娜张洋李猛张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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