Method for recovering vanadium from phosphate-removing underflow slag

A technology of underflow slag and vanadium precipitation, which is applied in the field of vanadium recycling, can solve problems such as production difficulties, vanadium leaching rate reduction, ammonia volatilization, etc., achieve high economic and social benefits, reduce impurity removal procedures, and vanadium conversion high efficiency effect

Active Publication Date: 2014-07-09
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

Although vanadium is recovered by this treatment, the roasting efficiency is reduced due to the high calcium content in the phosphorus removal bottom flow slag, and impurities such as phosphorus and silicon are easy to recycle and enrich, which brings great difficulties to production
[0004] However, if a carbonate system is used for leaching of phosphorus removal underflow slag, the carbonate is easily decomposed during high-temperature leaching, which not only reduces the leaching rate of vanadium, but also the operating environment on site is very harsh, and ammonia volatilization is very serious

Method used

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Examples

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Effect test

example 1

[0035] Add 100g of phosphorus removal underflow slag to 200ml of sodium oxalate solution with a mass fraction of 2% and a temperature of 60°C, and leaching for 60 minutes under constant stirring to obtain 190ml of leaching solution. After testing, the leaching solution contains 48.3g / L of vanadium, vanadium The leaching rate is 85%. Sulfuric acid was used to adjust the pH value of the leaching solution to 11, and 0.19 mol of ammonium sulfate was added at room temperature for vanadium precipitation to obtain 20.0 g of ammonium metavanadate with a vanadium precipitation rate of 95%.

example 2

[0037] Add 100g of phosphorus removal bottom flow slag to 200ml of sodium oxalate solution with a mass fraction of 5% and a temperature of 100°C, and leaching for 20 minutes under constant stirring to obtain 195ml of leaching solution. After testing, the leaching solution contains 49.8g / L of vanadium, vanadium The leaching rate was 90%. Hydrochloric acid was used to adjust the pH value of the leaching solution to 8. At room temperature, 0.76 mol of ammonium oxalate was added for vanadium precipitation to obtain 21.2 g of ammonium metavanadate, and the vanadium precipitation rate was 95%.

example 3

[0039] Add 100g of phosphorus removal underflow slag to 200ml of potassium oxalate solution with a mass fraction of 3% and a temperature of 80°C, leaching for 20 minutes under constant stirring to obtain 192ml of leachate, which contains 53.4g / L of vanadium and vanadium The leaching rate was 95%. Nitric acid was used to adjust the pH value of the leaching solution to 9. At room temperature, 0.96 mol of ammonium oxalate was added to precipitate vanadium to obtain 22.8 g of ammonium metavanadate, and the vanadium precipitation rate was 97%.

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Abstract

The invention discloses a method for recovering vanadium from phosphate-removing underflow slag, which comprises the following steps: A)using an oxalate solution for leaching the phosphate-removing underflow slag to obtain an alkalescent vanadium-containing leachate; and B)adjusting pH value of the alkalescent vanadium-containing leachate to 8-11, then performing molybdenum precipitation to obtain ammonium metavanadate. The method for recovering vanadium from phosphate-removing underflow slag uses a oxalate system for leaching the phosphate-removing underflow slag, no mass harmful gas such as ammonia gas and carbon dioxide is generated, cycle usage of waste water can be realized, the method is eco-friendly, and can realize clean production. The method provided by the invention has the advantages of short flow, simple operation and easy industrialization, and has high economic benefit and social benefit.

Description

technical field [0001] The invention relates to the technical field of vanadium recovery and utilization, in particular to a method for recovering vanadium from phosphorus removal bottom flow slag. Background technique [0002] The traditional process of producing vanadium oxide is vanadium raw material-sodium roasting-water immersion-purification-precipitation of vanadium-deammonization. During the process of water leaching of sodium roasted clinker, not only vanadium enters the leach solution, but also impurities such as phosphorus and silicon are also freed. in the leaching solution. In order to increase the precipitation rate of vanadium and improve the product quality of vanadium oxide, impurities such as silicon and phosphorus in the solution must be removed in the leaching solution. Usually the method for removing phosphorus in the leachate is to add an appropriate amount of calcium chloride solution in the leachate. When calcium chloride solution is added, excessive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B7/00
Inventor 殷兆迁杨仰军李千文高官金罗琼
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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