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Treatment method of vanadium recovery wastewater

A treatment method and technology for wastewater, applied in the direction of reduced water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Simple and convenient for industrial production

Inactive Publication Date: 2012-05-30
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing vanadium extraction wastewater treatment methods, such as the neutralization of sodium hydroxide and the loss of a large amount of ammonia volatilization when transferring to evaporation and concentration, and the defects that the obtained sodium sulfate crystals contain a large amount of ammonium sulfate impurities, the present invention provides a method for extracting vanadium Wastewater treatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add sodium metabisulfite 4.48g in 1L vanadium extraction waste water (wherein vanadium concentration 200mg / L, chromium concentration 1500mg / L, sodium concentration 17000mg / L, sulfate radical 62000mg / L, ammonium concentration is 9360mg / L), fully stir, at 25 After maintaining at ℃ for 30 minutes, add solid sodium carbonate at 40℃ until the pH value of the solution is adjusted to 7.0, and then filter after fully stirring at 40℃ for 20 minutes to obtain 4.13 g of filter residue and 0.996L of filtrate, and heat the filtrate to boiling The state is to concentrate the filtrate, collect and condense steam to obtain condensed water at the same time, when the solution is concentrated to a water content of 50% by weight, stop evaporation and concentration, obtain 0.793L condensed water and 0.126L concentrated solution, and the obtained condensed water has a concentration of 10029mg / L Ammonium bicarbonate solution, the concentrated solution obtained is the concentrated solution of s...

Embodiment 2

[0027] Add sodium metabisulfite 4.65g in 1L vanadium extraction waste water (wherein vanadium concentration 120mg / L, chromium concentration 1600mg / L, sodium concentration 17000mg / L, sulfate radical 62000mg / L, ammonium concentration is 9360mg / L), fully stir, at 25 After maintaining at ℃ for 30 minutes, add solid sodium carbonate at 40℃ until the pH value of the solution is adjusted to 7.5, stir well at 40℃ for 20 minutes and filter to obtain 4.15 g of filter residue and 0.995L of filtrate, and heat the filtrate to boiling The state is to concentrate the filtrate, collect and condense steam to obtain condensed water at the same time, and when the solution is concentrated to a water content of 45% by weight, stop evaporation and concentration to obtain 0.769L condensed water and 0.140L concentrated solution, and the obtained condensed water has a concentration of 9975mg / L Ammonium bicarbonate solution, the concentrated solution obtained is the concentrated solution of sodium sulfa...

Embodiment 3

[0029]Add sodium metabisulfite 5.09g in 1L vanadium extraction waste water (wherein vanadium concentration 150mg / L, chromium concentration 1700mg / L, sodium concentration 17000mg / L, sulfate radical 62000mg / L, ammonium concentration is 9360mg / L), fully stir, at 25 After maintaining at ℃ for 30 minutes, add solid sodium carbonate at 40℃ until the pH value of the solution is adjusted to 8.0, and then filter after fully stirring at 40℃ for 20 minutes to obtain 4.20 g of filter residue and 0.995L of filtrate, and heat the filtrate to boiling The state is to concentrate the filtrate, collect and condense steam to obtain condensed water at the same time, when the solution is concentrated to a water content of 40% by weight, stop evaporation and concentration, obtain 0.753L condensed water and 0.158L concentrated solution, and the obtained condensed water has a concentration of 9921mg / L ammonium bicarbonate solution, the concentrated solution obtained is a concentrated solution of sodiu...

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Abstract

The invention provides a treatment method of vanadium recovery wastewater, which is the wastewater generated from vanadium precipitation by ammonium sulfate in a vanadium precipitation technology by an acid ammonium salt. The method comprises: successively, subjecting vanadium recovery wastewater to first contact with a reducing agent so as to obtain a first mixture; and subjecting the first mixture to second contact with sodium carbonate and / or sodium bicarbonate so as to obtain a second mixture; filtering the second mixture to obtain a filter residue and a filter solution, which is then concentrated so as to obtain condensed water and a concentrated solution, and crystallizing the concentrated solution, thus obtaining a crystal and a mother solution. The treatment method provided in the invention can reduce the loss of ammoniacal nitrogen by 15-20 mole%, and the purity of an obtained sodium sulfate solid is greater than 98 mass%.

Description

technical field [0001] The invention relates to a treatment method for vanadium extraction wastewater. Background technique [0002] The production of vanadium oxide mainly adopts sodium roasting-ammonium salt vanadium precipitation process, wherein ammonium salt vanadium precipitation includes acidic ammonium salt vanadium precipitation and weakly basic ammonium salt vanadium precipitation. Generally, ammonium sulfate is used as the vanadium precipitation agent, and sulfuric acid is used to adjust the pH The value is acidic, causing ammonium polyvanadate to precipitate, and the vanadium extraction wastewater obtained after filtering ammonium polyvanadate contains a large amount of ammonium sulfate, sodium sulfate and a certain concentration of vanadium chromium ions. After the vanadium chromium ion is reduced, it is neutralized with sodium hydroxide and recovered by precipitation. After the recovery of vanadium chromium, the waste water is evaporated and concentrated to obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D5/00C02F1/70C02F101/22C02F101/20
Inventor 陈亮李千文李大标
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES