Beneficiation method for removing iron-aluminum sesquioxide from high-grade collophanite

By combining gravity separation and flotation, the process of separating iron and aluminum in high-grade phosphate rock is optimized, solving the problem of phosphoric acid production caused by high iron and aluminum content in existing technologies. This achieves efficient iron and aluminum removal and improves the grade of phosphate concentrate, thereby reducing production costs.

CN119733618BActive Publication Date: 2025-12-30BLUESTAR LEHIGH ENG INST CO LTD
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Patent Information

Application Number
CN202510071013.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-16
Publication Date
2025-12-30
Estimated Expiration
2045-01-16

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively reduce the content of iron and aluminum sesquioxides when processing high-grade phosphate rock, leading to increased viscosity, filter cloth clogging, and decreased product quality during phosphoric acid production. Furthermore, conventional processes suffer from problems such as excessively fine grinding, difficulties in concentrate transportation, and poor reagent selectivity.

Method used

The process combines gravity separation and flotation, including ultrafine crushing, gravity separation, reverse flotation and forward flotation. Through high-pressure roller milling, hydrocyclone classification, multi-stage gravity separation and flotation desliming, and the use of specific reagent combinations and optimized water return system, effective separation and recovery of iron and aluminum are achieved.

Benefits of technology

It significantly reduced the iron and aluminum content in the concentrate, improved the grade and quality of the phosphate concentrate, reduced grinding and reagent costs, and ensured the stability and efficiency of the production process.

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Abstract

The application is a beneficiation method for removing iron and aluminum sesquioxide from high-grade collophanite, and belongs to the technical field of mineral processing. The material obtained by crushing, superfine grinding and grading of raw ore is fed into a heavy separation operation to obtain a heavy separation concentrate and a heavy separation tailing; the heavy separation concentrate is fed into a reverse flotation magnesium removal operation buffer tank, and the heavy separation tailing is thickened, re-ground, classified, and then subjected to positive flotation desliming and positive flotation desilication, and the obtained concentrate is fed into the reverse flotation magnesium removal operation; three backwater pools are built to store positive flotation desilication backwater, reverse flotation magnesium removal backwater and heavy separation operation backwater respectively. The method mainly aims at high-grade high-sesquioxide calcareous collophanite, adopts heavy and float combined separation, divides the raw ore into a heavy separation concentrate and a heavy separation tailing through a heavy separation device, and subjects the heavy separation tailing to positive and reverse flotation to obtain a heavy tailing flotation concentrate. The separation process fully utilizes the advantages of positive and reverse flotation and heavy separation, the process flow is stable, the separation effect is good, high-quality phosphorus concentrate is realized, and low-quality phosphorus concentrate can be used.
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