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Method for extracting vanadium from vanadium slag

A technology of vanadium slag and sodium vanadate, which is applied in the field of metallurgy and chemical industry, can solve the problems of toxic gas, acidic ammonia nitrogen wastewater, harsh reaction conditions, and low conversion rate of vanadium, and achieve the effects of reducing the amount of addition, reducing the recovery process, and improving the extraction effect

Active Publication Date: 2019-03-01
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above method improves the conversion rate of vanadium in the process of sodium vanadium extraction by adjusting the components of roasting additives or controlling the conditions of the roasting process, but it still generally suffers from harsh reaction conditions, low vanadium conversion rate and toxic effects in the vanadium recovery process. Gas and a large amount of acidic ammonia nitrogen wastewater discharge and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036](1) Weigh 10g of refined vanadium slag (total vanadium content 5.0%), add 6% sodium carbonate and 6% sodium vanadate (water content 30%), place the material in a crucible after fully mixing, Roast in the furnace at 790°C for 1.5h to obtain roasted clinker;

[0037] (2) Leach the roasted clinker obtained in step (1) with hot water at 85° C. for 0.5 h, and filter after the leaching is completed to obtain a vanadium-containing leaching solution.

[0038] After detection, the roasting conversion rate of vanadium after step (1) is finished is 88.3%.

Embodiment 2

[0040] (1) Weigh 10g of refined vanadium slag (total vanadium content 5.0%), add 3% sodium carbonate and 9% sodium vanadate (water content 35%), place the material in a crucible after fully mixing, Roast at 850°C for 1 hour in a furnace to obtain roasted clinker;

[0041] (2) Leach the roasted clinker obtained in step (1) with hot water at 90° C. for 0.5 h, and filter after the leaching is completed to obtain a vanadium-containing leachate.

[0042] After detection, the roasting conversion rate of vanadium after step (1) is finished is 90.5%.

Embodiment 3

[0044] (1) Weigh 10 g of refined vanadium slag (total vanadium content 5.0%), add 1% sodium carbonate and 12% sodium vanadate (water content 25%), place the materials in a crucible after fully mixing them, and place them in a muffle Roasting at 810°C for 2 hours in a furnace to obtain roasted clinker;

[0045] (2) Leach the roasted clinker obtained in step (1) with hot water at 90° C. for 0.5 h, and filter after the leaching is completed to obtain a vanadium-containing leachate.

[0046] After detection, the roasting conversion rate of vanadium after step (1) is finished is 92.1%.

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Abstract

The invention relates to a method for extracting vanadium from vanadium slag. The method includes mixing vanadium slag, sodium carbonate and sodium vanadate, then roasting the obtained mixture to obtain a roasted clinker, leaching the roasted clinker and conducting solid-liquid separation to obtain a vanadium-containing leaching solution. The mixture of the sodium vanadate and the sodium carbonateis utilized to roasting the vanadium slag to extract the vanadium, the conversion rate of the vanadium by sodium salt roasting of the vanadium slag is improved, and the vanadium conversion rate can reach 92% or above, 5-10% higher than the prior art. In addition, the sodium vanadate in an intermediate product produced by the vanadium slag sub-molten salt method is added to achieve full utilization of the intermediate product sodium vanadate produced by the vanadium slag sub-molten salt method, and the sodium vanadate recovery procedure is reduced. At the same time, the addition amount of thesodium carbonate in the sodium salt roasting is reduced, the raw material cost is reduced, and good economic benefits and application prospects are achieved.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, and in particular relates to a method for extracting vanadium from vanadium slag, in particular to a method for roasting vanadium slag to extract vanadium by mixing sodium vanadate and sodium carbonate. Background technique [0002] The basic principle of sodium roasting process is based on Na 2 CO 3 As an additive, the low-valence vanadium is converted into a water-soluble pentavalent vanadium sodium salt by high-temperature sodium roasting, and then the sodium roasted product is directly immersed in water to obtain a vanadium-containing leach solution. Salt precipitation of vanadium produces ammonium polyvanadate (APV), and ammonium polyvanadate is calcined or reduced to form vanadium pentoxide (V 2 o 5 ) or vanadium trioxide (V 2 o 3 ). The recovery rate of vanadium in the sodium roasting process is low, and the recovery rate of vanadium in a single roasting process is abo...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B7/00C22B34/22
CPCC22B1/02C22B7/001C22B7/006C22B34/22Y02P10/20
Inventor 周冰晶陈东辉李兰杰王海旭高明磊李男赵备备
Owner HEBEI IRON AND STEEL
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