Method for green vanadium precipitation and sodium-ammonium circulation of sodium-modified vanadium liquid

By using a hydrochloric acid-ammonium chloride precipitation system and iron reduction, along with polycarboxylate superplasticizer for impurity removal, combined with direct CO2 carbonization and low-temperature crystallization, the problem of wasted sodium ammonium resources and impurity removal in sodium vanadium liquid precipitation has been solved. This achieves efficient and stable sodium ammonium recovery and recycling, making it a green vanadium precipitation process suitable for hydrometallurgical fields.

CN121344353APending Publication Date: 2026-01-16PANZHIHUA UNIV
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Patent Information

Application Number
CN202511625106.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-07
Publication Date
2026-01-16

AI Technical Summary

Technical Problem

Existing sodium vanadium liquid precipitation processes suffer from the waste of sodium and ammonium resources and the problem of solid waste disposal. Furthermore, there is a lack of efficient methods to remove multi-component impurities from vanadium precipitation wastewater, resulting in low purity of the recovered products, poor cycle stability, and difficulties in industrial application.

Method used

A hydrochloric acid-ammonium chloride precipitation system is adopted, combined with iron reduction and polycarboxylate superplasticizer for impurity removal. Sodium bicarbonate and ammonium chloride are recovered through direct CO2 carbonization and low-temperature crystallization, achieving efficient recovery and closed-loop circulation of sodium and ammonium ions.

Benefits of technology

It achieves the recovery of high-purity sodium bicarbonate and ammonium chloride, with good system cycle stability, high product purity, and direct reuse, solving the sodium-ammonium cycle dilemma and possessing excellent long-term operational stability and low cost.

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Abstract

The invention relates to a method for green vanadium precipitation and sodium-ammonium circulation of a sodium modified vanadium solution, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: adding hydrochloric acid and ammonium chloride into the sodium vanadium solution, adjusting the pH value, carrying out heating reaction, and carrying out solid-liquid separation to obtain ammonium polyvanadate and vanadium precipitation wastewater; adding a reducing agent into the vanadium precipitation wastewater for reduction reaction; adding a polycarboxylic acid water reducer, adjusting the pH value with ammonia water, and carrying out solid-liquid separation to obtain purified wastewater and vanadium-chromium filter residues; introducing carbon dioxide gas into the purified wastewater until the purified wastewater is saturated, cooling, crystallizing, and carrying out solid-liquid separation to obtain sodium bicarbonate solid and crystallization mother liquor; and evaporating and concentrating the crystallization mother liquor until the concentration of ammonium chloride is 65-75g / L, then cooling and crystallizing at the temperature of-10-20 DEG C, and carrying out solid-liquid separation to obtain ammonium chloride solid and residual wastewater. According to the invention, high-efficiency and high-purity recovery of sodium and ammonium ions and closed circulation of the system are realized, and the problems of sodium and ammonium circulation and impurity accumulation in the traditional process are solved.
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