Method for preparing pigment prussian blue by using prussian blue type sodium ion battery positive electrode material waste

By oxidizing Prussian blue-based sodium-ion battery cathode material waste and reacting it with micron-sized substrates, high-purity spherical Prussian blue pigment was prepared. This solved the problems of control difficulty and performance instability in the waste recycling process, and realized the preparation of high-value-added pigments.

CN122212175APending Publication Date: 2026-06-16ZHEJIANG SUPER SODIUM NEW ENERGY MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG SUPER SODIUM NEW ENERGY MATERIALS CO LTD
Filing Date
2026-04-08
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

In existing technologies, the recycling process of Prussian blue materials is difficult to control, the product performance is unstable, and there are impurities, resulting in low recycling value and poor economic efficiency. At the same time, pigment-grade Prussian blue has problems such as hue difference and unstable whiteness.

Method used

By mixing Prussian blue sodium-ion battery cathode material waste with alkaline solution, performing solid-liquid separation, adjusting the pH value and performing oxidation treatment, and combining it with micron-sized substrate particles, spherical Prussian blue pigment is prepared. This process includes oxidation and impurity removal, as well as dispersion and pulping steps, to form a high-purity pigment.

Benefits of technology

It achieves efficient recycling of waste materials and produces high-value-added Prussian blue pigment. The process is easy to control, the equipment utilization rate is high, the color stability is good, and the economy is excellent.

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Abstract

The application discloses a method for preparing pigment Prussian blue by using Prussian blue type sodium ion battery positive material waste, which comprises the following steps: mixing and reacting Prussian blue type sodium ion battery positive material waste with alkaline solution to obtain alkaline sodium ferrocyanide regeneration liquid and metal hydroxide precipitation; adjusting the pH value of the alkaline sodium ferrocyanide regeneration liquid by using dilute acid to obtain sodium ferrocyanide regeneration liquid; performing acid dissolution on the metal hydroxide precipitation, and then performing oxidation to obtain ferric sulfate regeneration liquid; and inputting the sodium ferrocyanide regeneration liquid and the ferric sulfate regeneration liquid into a reaction device provided with micron substrate particles to perform reaction and obtain pigment Prussian blue. In the application, the difference of the waste is avoided by simple process unification, and the subsequent recycling is almost not affected; the prepared pigment Prussian blue has high added value and better economy.
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