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Method for reclaiming vanadium oxide from dephosphorization underflow slag

A technology of underflow slag and vanadium oxide, applied in the direction of vanadium oxide, etc., can solve the problems of low vanadium conversion rate, long treatment process, low recovery rate, etc., achieve high vanadium conversion rate, low production cost, and save the amount of consumption

Inactive Publication Date: 2008-05-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method has obvious deficiencies: the one, the calcium content in the phosphorus removal bottom flow slag is high, the vanadium conversion rate in the sodiumization roasting process is low, causes the total recovery rate to be low; Part of the silicon, phosphorus and other impurities re-enter the leach solution during the leaching process, which needs to be further removed; third, the treatment process is long and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 100g of phosphorus removal bottom flow slag (main components: V 10.08%, Si 5.69%, P 2.68%, Ca 16.98%) to 400ml of 9% sodium bicarbonate solution, stir and heat to 90°C, react for 20min After filtering and washing, 95.88g of residue (V 1.47%, vanadium leaching rate 86.0%) and 454ml of leachate (V 19.08g / l, Si 0.449g / l, P<0.01g / l) were obtained.

[0019] Add 0.65g of aluminum sulfate to the leaching solution and filter. The pH value of the filtrate was adjusted to 1.8 with concentrated sulfuric acid, 10.4 g of ammonium sulfate was added and heated and stirred for 40 min to obtain 17.15 g of ammonium polyvanadate. Under an oxidizing atmosphere, ammonium polyvanadate was burned at 500°C for 1 hour to deammoniate to obtain 15.12 g of vanadium pentoxide, whose V 2 o 5 The content is 98.8%.

Embodiment 2

[0021] Take 500g of phosphorus removal bottom flow slag (main components: V 10.08%, Si 5.69%, P 2.68%, Ca 16.98%) and add it to 1000ml of 10% ammonium bicarbonate solution, stir and heat to 50°C, react for 70min After filtering and washing, 476.82g of residue (V 1.45%, vanadium leaching rate 86.3%) and 1412ml of leachate (V 30.80g / l, Si 0.536 g / l, P<0.01g / l) were obtained.

[0022] Add 2.40g of aluminum sulfate to the leaching solution and filter. Adjust the pH value of the filtrate to 8.5 with concentrated ammonia water, add 140 g of ammonium chloride, stir at room temperature for 1 hour, and let stand to obtain 99.62 g of ammonium metavanadate. Ammonium metavanadate was burned at 500° C. for 1 hour to deammoniate to obtain 76.19 g of vanadium pentoxide with a V2O5 content of 98.6%.

[0023] Inject CO2 gas into the supernatant of vanadium precipitation until the pH value of the solution remains constant, add an appropriate amount of ammonium bicarbonate so that the concentra...

Embodiment 3

[0025] Take 200g of phosphorus removal bottom flow slag (main components are: V 10.08%, Si 5.69%, P 2.68%, Ca 16.98%) and join in 650ml concentration and be 10% ammonium carbonate solution. Stir and heat to 70°C, filter and wash after reacting for 50min, obtain residue 190.73g (V 1.50%, vanadium leaching rate 85.8%), leachate 796ml (V 21.73g / l, Si 0.536g / l, P<0.01g / l l).

[0026] Add 1.35g of aluminum sulfate to the leaching solution and filter. Adjust the pH value of the filtrate to 8.7 with concentrated ammonia water, add 18 g of ammonium chloride, stir at room temperature for 1 hour, and let stand to obtain 39.62 g of ammonium metavanadate. Ammonium metavanadate was burned at 500°C for 1 hour to deammoniate to obtain 30.84 g of vanadium pentoxide with a V2O5 content of 98.6%.

[0027] Inject CO into the vanadium supernatant 2 Gas until the pH value of the solution remains constant, add an appropriate amount of ammonium bicarbonate so that the concentration of ammonium bi...

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Abstract

The invention relates to a method for recovering vanadium oxide from underflow slag for phosphorus removal, in particular to the method that carbonated water solution is used for directly leaching the underflow slag for phosphorus removal; solid-liquid separation is carried out after the leaching reaction is completed; the leaching liquor after silica removal is used for precipitating vanadium so as to prepare ammonium metavanadate or ammonium polyvanadate to further obtain vanadium oxide products; vanadium precipitating waste water can return to the leaching procedure for recycling and the vanadium recovery rate during the whole process can reach above 83 percent. The method of the invention leads the vanadium from the underflow slag for phosphorus removal to be recycled and reused, and has the advantages of short technological process, convenient operation, being easy to be industrialized, etc.

Description

technical field [0001] The invention relates to a method for recovering vanadium oxide from phosphorus removal bottom flow slag, in particular to a process for leaching and recovery of vanadium oxide from phosphorus removal bottom flow slag with a carbonate aqueous solution. Background technique [0002] The traditional process of producing vanadium oxide is sodium roasting of vanadium raw material, water immersion purification, and deamination of vanadium. During the water immersion process of sodium roasting clinker, in addition to vanadium entering the solution, impurities such as silicon and phosphorus also enter the solution. In order to improve the precipitation rate and product quality of vanadium, obtain high-purity V 2 o 5 , It is essential to remove impurities such as silicon and phosphorus in the leaching solution. [0003] Usually, the way to remove impurities such as silicon and phosphorus in the leaching solution is to add an appropriate amount of calcium chl...

Claims

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Application Information

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IPC IPC(8): C01G31/02
Inventor 付自碧孙朝晖王小江杨小琴边悟张新霞张帆彭毅
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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