Full-cycling technology for vanadium smelting wastewater

Abstract

The invention discloses a method for treating and fully cycling vanadium smelting wastewater. The method adopts a treatment technology in combination of a physical chemistry precipitation method and an RO (Reverse Osmosis) membrane treatment technology, so that various pollutants in the wastewater can be treated well, and moreover, the wastewater can be recycled by relevant vanadium smelting technologies, and further zero drainage of the vanadium smelting wastewater can be achieved. With the adoption of the method, the water resource is greatly saved, the amount of used additives in the vanadium smelting technology is reduced, and the metal resource can be recovered. The treatment method mainly comprises the steps of precipitating wastewater, adjusting pH (Potential Of Hydrogen), performing heavy metal ion reduction, performing coagulating sedimentation, absorbing and removing arsenic, performing mechanical filtering, filtering through active carbon, performing precise filtering, performing RO reverse osmosis membrane treatment, and reusing the wastewater in relevant vanadium smelting technologies and the like. The technology has the characteristics of long running period, good treatment effect, and zero drainage of vanadium smelting wastewater, and saves the amount of used NaCl and NaOH. The method is characterized in that the physical chemistry precipitation method and the RO membrane treatment technology are perfectly combined, and the purpose of turning waste into wealth is achieved based on the properties of the wastewater in each stage; and the wastewater is reused in the relevant vanadium smelting technological stages.

Description

technical field [0001] The invention relates to a cleaning process for treating ion-exchange water in vanadium smelting wastewater by using "physicochemical precipitation method + RO reverse osmosis", especially a full-cycle technology for vanadium smelting wastewater, specifically using physical and chemical methods to treat vanadium The heavy metals in the smelting wastewater are treated by RO reverse osmosis membrane, the dialysate is reused to the stage of vanadium immersion process, the concentrated solution is reused to the stage of analyzing ion exchange resin, and the tail water of vanadium precipitation is reused to the stage of ball formation. Background technique [0002] Metal vanadium and its compounds are important strategic materials. Adding 0.1-0.15% vanadium to cast iron can significantly improve the strength, toughness and wear resistance of castings when added to steel as an alloying element to refine grains and improve steel performance. sex. Vanadium pe...

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Problems solved by technology

The iron filings (or ferrous sulfate) precipitation method is prone to corrosion and passivation, which affects the stability of the water purification effect. At the same time, the treatment cost is relatively expensive and the operation is complicated; the reducing agent SO in the sulfur dioxide precipitation method 2 The source problem seriously limits the practical application range of this method

[0005] There is a serious problem in the treatment of vanadium smelting wastewater by the above methods. The high salinity and high chloride ion content in the wastewater cannot be solved, and many of them cannot meet the discharge standards.

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