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A method for extracting vanadium by ammonification of vanadium slag blank roasting

A blank roasting and vanadium slag technology is applied in the field of vanadium chemical industry and metallurgy to achieve the effects of reducing production costs, improving solid-liquid separation performance, and increasing vanadium conversion rate

Active Publication Date: 2019-08-06
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

[0005] In view of the problems existing in the prior art, the present invention provides a method for extracting vanadium by ammonification of vanadium slag blank roasting, using a fluidized fluidized furnace as a vanadium slag blank roasting equipment, and adding a regulator to solve the problem of vanadium slag roasting in the traditional method. The problem of long time and high energy consumption of roasting improves production efficiency and reduces production cost. At the same time, it improves the ammonium conversion rate of vanadium and improves the performance of solid-liquid separation. It has a good application prospect.

Method used

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  • A method for extracting vanadium by ammonification of vanadium slag blank roasting

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Experimental program
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Effect test

Embodiment 1

[0052] (1) Add 1 kg of vanadium slag with a particle size of 100-200 mesh into the fluidized fluidized furnace, and control the blast volume of the fluidized fluidized furnace to 4Nm 3 / h (under standard conditions), the air flow rate is 1.0m / s, and the temperature is raised to 900°C for blank roasting for 0.4h, and the roasted clinker is naturally cooled in the air;

[0053] (2) add ammonium bicarbonate solution in the roasting clinker that step (1) obtains and carry out ammonization, add the sodium carbonate regulator of vanadium slag quality 3% simultaneously, the concentration of control ammonium bicarbonate solution is 50wt%, and temperature is 50 ℃, the liquid-solid ratio of solution and roasted clinker is 0.4:1, and the ammonization time is 3h;

[0054] (3) After the ammonization reaction is completed, add hot liquid to the mixed material for leaching, and leaching at 90°C for 3 hours. The ammonia gas and carbon dioxide generated during leaching will synthesize ammonium...

Embodiment 2

[0058] (1) Add 0.1kg of vanadium slag with a particle size of 150-200 mesh into the fluidized fluidized furnace, and control the blast volume of the fluidized fluidized furnace to 1Nm 3 / h (under standard conditions), the air flow rate is 1.8m / s, and the temperature is raised to 800°C for blank roasting for 0.45h, and the roasted clinker is naturally cooled in the air;

[0059] (2) add ammonium bicarbonate solution in the roasting clinker that step (1) obtains and carry out ammonization, add the sodium carbonate regulator of vanadium slag quality 2% simultaneously, the concentration of control ammonium bicarbonate solution is 30wt%, and temperature is 40 ℃, the liquid-solid ratio of solution and roasted clinker is 0.4:1, and the ammonization time is 1h;

[0060] (3) After the ammonization reaction is completed, add hot liquid to the mixed material for leaching, and leaching at 80°C for 2.5 hours. The ammonia gas and carbon dioxide generated during leaching will synthesize ammo...

Embodiment 3

[0064] (1) Add 0.5kg of vanadium slag with a particle size of 100-150 mesh into the fluidized fluidized furnace, and control the blast volume of the fluidized fluidized furnace to 2Nm 3 / h (under standard conditions), the air flow rate is 0.8m / s, and the temperature is raised to 950°C for blank roasting for 0.2h, and the roasted clinker is naturally cooled in the air;

[0065] (2) add ammonium bicarbonate solution in the roasting clinker that step (1) obtains and carry out ammonization, add the sodium carbonate regulator of vanadium slag quality 5% simultaneously, the concentration of control ammonium bicarbonate solution is 45wt%, and temperature is 60 ℃, the liquid-solid ratio of solution and roasted clinker is 0.2:1, and the ammonization time is 1h;

[0066] (3) After the ammonization reaction is completed, add hot liquid to the mixed material for leaching, and leaching at 90°C for 1 hour. The ammonia gas and carbon dioxide generated during leaching will synthesize ammonium...

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Abstract

The invention relates to a method for extracting vanadium from vanadium slag through blank roasting and quaternarization. The method comprises the steps of adding the vanadium slag to a fluidized bedfurnace for blank roasting; mixing roasted clinkers obtained through blank roasting, ammonium salt solutions and regulators for quaternarization, and leaching upon completion of quaternarization; andobtaining vanadium-containing solutions after solid-liquid separation. According to the method provided by the invention, by adopting the fluidized bed furnace as equipment for roasting the vanadium slag, and adding an appropriate amount of the regulators, the heat transfer efficiency is improved, and the roasting time is shortened; the production energy consumption is reduced, and meanwhile the adverse effect of silicon-containing phases is eliminated; and the vanadium conversion rate by quaternarization and the solid-liquid separation performance are improved. With the method provided by theinvention, the phenomena of bonding and sintering hardly occur in the high-temperature roasting process, so that oxygen comes into sufficient contact with vanadium slag particles, and the vanadium conversion rate is improved greatly; meanwhile, the amount of ammonium salt and the production cost are reduced; the cyclic utilization of ammonium salt media can be achieved, and the whole process hasno waste water discharged; and the method has good application prospects.

Description

technical field [0001] The invention relates to the technical field of vanadium chemical metallurgy, in particular to a method for extracting vanadium by leaching from vanadium slag, and in particular to a method for extracting vanadium by ammonium blank roasting of vanadium slag. 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 rate of vanadium in a single roasting is about 70%, and the recovery rate of vanadium after multi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/04C22B34/22
CPCC22B1/04C22B7/008C22B34/22Y02P10/20
Inventor 刘彪杜浩王少娜王欣然
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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