Method for efficiently recovering phosphorus-containing waste residues and converting phosphorus-containing waste residues into hydroxyapatite

CN119461281APending Publication Date: 2025-02-18GUIZHOU INST OF TECH
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Patent Information

Application Number
CN202411473024.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-22
Publication Date
2025-02-18

AI Technical Summary

Technical Problem

The prior art has problems in the resource utilization of phosphorus-containing waste slags, low added value, low phosphorus recycling rate and low product purity. It is mainly due to the complex composition of phosphorus-containing waste slags and the various chemical forms of phosphorus, which makes the recycling process difficult to control. .

Method used

Using the "preconversion purification + secondary conversion purification + heat treatment" process, the pretreatment is performed by adding medium and strong acid aqueous solution to the phosphorus-containing waste residue, and then reacting with the phosphorus aqueous solution to form a calcium dihydrogen phosphate precursor, and then mixing with the calcium-containing reagent and adjusting. The pH value is finally purified by heat treatment to prepare high-purity hydroxyapatite.

Benefits of technology

It improves the recycling rate of phosphorus, obtains high added value and high purity hydroxyapatite products, meets the purity requirements of industrial-grade products, and reduces the treatment cost and the introduction of impurities.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a method for efficiently recovering and converting phosphorus-containing waste residues into hydroxyapatite, which comprises the following steps: firstly, pretreating the phosphorus-containing waste residues to realize pre-conversion purification, then converting the phosphorus-containing waste residues into a monocalcium phosphate precursor, carrying out chemical conversion on the monocalcium phosphate precursor as a raw material to generate hydroxyapatite, and finally, carrying out heat treatment to further purify. The process method is simple, low in production cost and simple and convenient to operate, and the phosphorus in the phosphorus-containing waste residues is relatively high in recycling rate. In addition, the added value of the product converted into hydroxyapatite is high, and the purity of the product meets the requirements of industrial-grade products, so that the efficient comprehensive utilization of the phosphorus-containing waste residues is realized.
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