Method for preparing anhydrous iron phosphate from phosphorus iron slag

By combining partial acid leaching and alkaline leaching, and utilizing the solubility characteristics of ferric phosphate in acids and alkalis, along with iron powder reduction and oxidant treatment, the problem of high difficulty and cost in removing aluminum impurities from ferric phosphate slag has been solved, achieving low-consumption and high-efficiency recovery and preparation of ferric phosphate.

CN118666257BActive Publication Date: 2026-06-12CINF ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CINF ENG CO LTD
Filing Date
2024-07-09
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing phosphorus and iron slag recycling technologies suffer from problems such as difficulty in removing aluminum impurities, high costs, high acid and alkali consumption, and low utilization rate of phosphorus and iron slag, which affect the recovery efficiency of phosphorus and iron resources and product quality.

⚗Method used

Anhydrous ferric phosphate was prepared by using a combination of partial acid leaching and partial alkali leaching, iron powder reduction and oxidant treatment, adjusting the Fe:P molar ratio through neutralization reaction, utilizing the solubility characteristics of ferric phosphate in acid and alkali to carry out self-neutralization reaction, reducing acid and alkali consumption, removing impurities through filtration and washing, and finally drying and sintering.

🎯Benefits of technology

It reduces acid and alkali consumption, decreases the use of iron powder and phosphorus source, improves the recovery rate and product quality of ferric phosphate, reduces production costs, and is suitable for industrial applications.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to lithium battery recycling technical field, especially to a kind of method for preparing anhydrous iron phosphate from phosphorus iron slag, comprising the following steps: S1, phosphorus iron slag is slurried by adding water, then proportioned into two parts, respectively slurry 1 and slurry 2;S2, acid is added to slurry 1 for acid leaching, filtration, to obtain acid leaching liquid and acid leaching residue;The acid leaching liquid is reduced, filtered, to obtain copper-containing residue and reduced acid leaching liquid;Alkali is added to slurry 2 for alkali leaching, filtration, to obtain alkali leaching liquid and alkali leaching residue;S3, reduced acid leaching liquid and alkali leaching liquid are mixed for neutralization reaction, filtration, to obtain neutralized liquid and aluminum-containing residue after S4, the neutralized liquid is oxidized, aged, filtered, washed, dried, sintered, to obtain anhydrous iron phosphate.The present application is partially acid leached and partially alkali leached to phosphorus iron slag, and self-neutralization reaction is carried out using reduced acid leaching liquid and alkali leaching liquid, so that acid and alkali consumption is small, and production cost is low.
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