Process for the treatment of phosphorus-containing rare earth ores

By combining roasting and ammonium citrate solution leaching with pH adjustment, the problem of efficient recovery of phosphorus and rare earth elements in phosphorus-containing rare earth ores was solved, achieving high-purity magnesium ammonium phosphate and high leaching rate of rare earths, simplifying the process and reducing energy consumption.

CN116732363BActive Publication Date: 2026-02-06BAOTOU RESEARCH INSTITUTE OF RARE EARTHS
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Patent Information

Application Number
CN202310718395.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-16
Publication Date
2026-02-06
Estimated Expiration
2043-06-16

AI Technical Summary

Technical Problem

Existing technologies are difficult to efficiently recover and purify phosphorus and rare earth elements in phosphorus-containing rare earth ores, and they also have problems such as high energy consumption, long process and large amount of wastewater.

Method used

The process involves roasting phosphorus-containing rare earth ore with magnesium chloride at 600–900℃, followed by leaching with ammonium citrate solution. The pH is then adjusted to form magnesium ammonium phosphate, which is then combined with hydrochloric acid to leach rare earth elements, thus achieving the separation and recovery of phosphorus and rare earth elements.

Benefits of technology

It achieves high recovery rate of phosphorus and high-purity production of magnesium ammonium phosphate, as well as high leaching rate of rare earth elements, with simple process, low energy consumption and little wastewater.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a treatment method of phosphorus-containing rare earth ore. (1) raw materials including the phosphorus-containing rare earth ore and magnesium chloride are calcined at 600-900 DEG C to obtain calcined ore; wherein the molar ratio of phosphorus element contained in the phosphorus-containing rare earth ore to the magnesium chloride is 1:(1.3-3.5); (2) the calcined ore is leached by an ammonium citrate solution to obtain a phosphorus-containing solution and rare earth residue; wherein the concentration of the ammonium citrate solution is 0.03-0.5 mol / L, and the leaching time is 15-200 min; (3) the pH of the phosphorus-containing solution is adjusted to 7.5-10 to obtain ammonium magnesium phosphate and supernatant. The treatment method can recover the rare earth elements and the phosphorus element in the phosphorus-containing rare earth ore respectively.
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Citation Information

Patent Citations

  • A method for stepwise extraction of phosphorus and rare earth elements from phosphorus-containing rare earth concentrates by low-temperature roasting with concentrated sulfuric acid.

    CN108950188B

  • Processing methods for rare earth concentrates

    CN109136538B

  • Method for recycling high-purity fluorine and phosphorus from wastewater of phosphogypsum residue field

    CN102887535A

  • Treatment method for rare earth ore concentrates

    CN109136538A