Process for purifying and treating vanadium-containing wastewater in advanced manner and process for recycling vanadium and chromium

Abstract

The invention relates to a process for purifying and treating vanadium-containing wastewater in an advanced manner and a process for recycling vanadium and chromium, and belongs to the field of sewage treatment.The process for purifying and treating the vanadium-containing wastewater in the advanced manner includes regulating a pH (potential of hydrogen) value of the vanadium-containing wastewater until the pH value reaches 4-6, sequentially adsorbing the vanadium-containing wastewater by the aid of resin A and resin B which are used as adsorption media; draining tail liquid which reaches standards and is obtained after the vanadium-containing wastewater is adsorbed.The resin A is chelating ion exchange resin; the resin B is macroporous weakly basic anion exchange resin with polyamine.The processes have the advantages that the process for purifying and treating the vanadium-containing wastewater is a novel, efficient and low-cost technology for treating heavy metal wastewater, the requirement on harmlessness and resource recovery (valuable heavy metal recycling) of the vanadium-containing wastewater and the requirement on water recycling and reusing can be simultaneously met, the processes are novel environment-friendly emission reduction and resource recycling technologies, 'cleaner production' standards implemented for vanadium metallurgy and vanadium application industries can be improved, and the processes have obvious economic and social benefits.

Description

technical field [0001] The invention relates to a process for advanced purification treatment of vanadium-containing wastewater and recovery of vanadium and chromium, which belongs to the field of sewage treatment. Background technique [0002] Vanadium is a rare metal and one of the country's important strategic resources. At present, China mainly extracts vanadium products from stone coal, vanadium slag, etc., and most of them use sodium roasting, calcification roasting and wet extraction processes, because the raw materials contain many toxic associated elements, such as chromium, arsenic, and mercury associated with stone coal mines. , lead, cadmium, etc. These toxic substances will eventually enter the wastewater with the smelting process. If they are not treated, they will pose a greater threat to the surrounding water environment. At the same time, vanadium-containing wastewater mainly exists in the form of V (V), and among various vanadium ions, V (V) is the most to...

AI Technical Summary

Problems solved by technology

The adsorption method and the preparation of adsorbents are current research hotspots. It has the advantages of relatively simple operation and low treatment cost, but researchers need to make further breakthroughs in terms of treatment effect and adsorption capacity.

[0013] Due to the complex characteristics of vanadium wastewater with various heavy metal pollution, high salinity, and poor biodegradability, the treatment effect of the above treatment processes is limited, and it is difficult to meet the requirements of complete harmlessness, resource utilization and even reuse.

Images