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.

Full-cycling technology for vanadium smelting wastewater

The invention discloses a method for treating vanadium extracting industrial acid wastewater and comprehensively recycling valuable metal. The method comprises the following steps that aeration and oxidation are carried out on the acid wastewater, and then a purifying agent A is added and is at least one of limestone, unslaked lime, slaked lime and lime milk; stirring is carried out for reacting, and the pH of the reaction endpoint is controlled to be equal to 4.5 to 5.0; filtering and washing are carried out, and primary purifying liquid and primary purifying residues are obtained; a purifying agent B is added to the primary purifying liquid, and is at least one of unslaked lime, slaked lime and lime milk; stirring is carried out for reacting, and the pH of the reaction endpoint is controlled to be equal to 6.5 to 7.5; filtering and washing are carried out, and secondary purifying liquid and secondary purifying residues are obtained; and a purifying agent C is added to the secondary purifying liquid and is at least one of sodium dimethyldithiocarbamate (SDD), sodium sulfide and barium sulfide, stirring is carried out for reacting, filtering is carried out, and third purifying liquid and third purifying residues are obtained. The method has the beneficial effects of being simple in process step, low in treatment cost, good in valuable metal comprehensive recovery effect and the like.

Method for treating vanadium extracting industrial acid wastewater and comprehensively recycling valuable metal

The invention discloses a recycling technology of acidic vanadium mother liquor ion exchange tail water of which pH is 11-12 liquid used in a general ion exchange technology is neutral or weakly alkaline; concentration balance of other sulfates and silicates in the liquid is ensured in the repeated cycle process of the exchange tail water; selective complete absorption of vanadium ions in the complicated liquid environment is achieved by type selection and collocation of resin; sodium hydroxide is used as an analytical agent and also can be used as a regenerant of the resin; hydrochloric acid is used as a detoxicant of the resin; the concentration of the mother liquid is about 6gv2O5/L; the concentration of the exchange tail water is less than 01gv2O5/L; the adsorption rate of the resin to vanadium can be over 98% The infinite cycle technology has the advantages that: compared with the total yield of vanadium by virtue of leaching of a vanadium clinker of which the pH is 2-3, the total yield of the vanadium is improved by 15-20% by virtue of leaching employing the liquid of which the pH is 11-12 The infinite cycle technology has main characteristics that selective absorption of the vanadium ions is solved by using strongly alkaline mixed resin, and infinite cyclic utilization of the ion exchange tail water is achieved

Infinite cyclic utilization technology of acidic vanadium mother liquor ion exchange tail water

A vanadium pentoxide waste water treatment and resources recycling method. Adjusting the pH in vanadium pentoxide waste water, and adding a reducing agent to reduce hexavalent chromium and produce trivalent chromium; adding a precipitator, and separating, after the reaction, into a supernatant and sludge; filtering the supernatant, obtaining purified waste water by adsorpting the filtered waste water, and pumping the purified waste water into a low-pressure reverse-osmosis system to desalinate and obtain a dialysate 1 and a concentrated solution 1; pumping the concentrated solution 1 into a high-pressure reverse-osmosis system to undergo a high-pressure reverse-osmosis desalination so as to obtain a dialysate 2 and a concentrated solution 2; mixing the dialysate 1 and the dialysate 2 to obtain a regenerated water for using as the chromium leaching water during the leaching stage in production, and entering the concentrated solution 2 into an electrodialysis system for concentration; entering the produced dialysis solution 3 into a high-pressure reverse-osmosis system to continue recycling and discharging the produced concentrated solution 3 into a brine pool to be used as brine during the salting and balling stage of the vanadium pentoxide production.

Vanadium pentoxide waste water treatment and resources recycling method

The invention provides a processing method of vanadium-precipitation wastewater in vanadium oxide production, comprising the following steps: carrying out evaporation and concentrated crystallization on the vanadium-precipitation wastewater in the vanadium oxide production; manufacturing waste residues obtained after the evaporation and concentrated crystallization into material blocks with holes; and roasting the material blocks. According to the processing method of the vanadium-precipitation wastewater in the vanadium oxide production, the waste residues can be more fully roasted and ammonium sulfate can be more thoroughly decomposed because of manufacturing the waste residues obtained after the evaporation and concentration into the material blocks with the holes and then roasting.

Processing method of vanadium-precipitation wastewater in vanadium oxide production

This invention provides a pollution process of vanadic anhydride production waste water and its entire circulation technique. Use end water of resin adsorbing extracting vanadium segment as soaking vanadium water of leaching segment, use ammonium salt immersing vanadium waste water that is added sodium chloride as vanadium salt stripping water of stripping segment, directly cyclically utilize in certain time; add iron sulfide mine powder and sodium sulfide into end water, add calcarea and sodium sulfide into immersing vanadium waste water, mix, stand still, precipitate, cyclically utilize clean liquid; eliminate high density natrium salt into saline water tank of salting producing ball segment, which is used as saline water of salting producing ball segment. This technique solves pollution problems of end water and immersing vanadium waste water in vanadic anhydride production. It also can utilize waste water natrium salt.

Liu Qiangguo Tang

Papers

Treatment of waste water in vanadium pentaoxide production and its full circulation technology