Method for treating vanadium-containing waste liquid in a laboratory

By employing multi-stage pH control and directional crystallization processes, the problem of incomplete recovery of vanadium and phosphorus from vanadium-containing wastewater in the laboratory was solved. This enabled the cascade recovery and resource utilization of vanadium, phosphorus, and sodium elements, reducing treatment costs and achieving near-zero emissions.

CN120423730BActive Publication Date: 2026-06-26PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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Patent Information

Application Number
CN202510674976.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-05-23
Publication Date
2026-06-26
Estimated Expiration
2045-05-23

AI Technical Summary

Technical Problem

Existing laboratory methods for treating vanadium-containing waste liquid suffer from incomplete vanadium and phosphorus recovery, lack of resource utilization of valuable elements, and failure to meet environmental protection standards for waste liquid and waste gas.

Method used

A multi-stage pH control and directional crystallization process is adopted to achieve the graded recovery of vanadium, phosphorus and sodium elements through steps such as concentration, oxidation, precipitation and separation. This includes the conversion of V4+ to V5+, precipitation of Fe3+, precipitation of Cr3+ and Ti4+, reaction of NH4+ with V5+ to form NH4VO3, and reaction of Mg2+ with PO43- to form magnesium ammonium phosphate crystals. Finally, ammonium sulfate and sodium sulfate are obtained by distillation.

Benefits of technology

The recovery rate of vanadium exceeded 82%, and the recovery rate of phosphorus exceeded 84%. Waste liquid was utilized as a resource, reducing treatment costs, avoiding resource waste and environmental pollution, and achieving near-zero emissions.

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Abstract

The application discloses a kind of laboratory vanadium-containing waste liquid processing methods, belong to sewage treatment field.The specific steps include: waste liquid is concentrated after adding H2O2 reaction, adjust pH value and precipitate iron, chromium, titanium in turn, then generate NH4VO3 crystal and ammonium magnesium phosphate crystal by adjusting pH value and adding crystal seed, finally adjust pH value and distill ammonia water to prepare ammonium sulfate, residual liquid is evaporated to obtain Na2SO4.The application realizes the gradient recovery of vanadium, phosphorus and sodium elements by multistage pH control and directional crystallization process, the vanadium recovery rate of this method is >82%, the phosphorus recovery rate is >84%, which can effectively solve the technical problems of incomplete recovery of vanadium and phosphorus, non-resource utilization of valuable elements and non-compliance of waste liquid and waste gas environmental protection in existing laboratory vanadium-containing waste liquid treatment methods.
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