Combined inhibitor for reverse flotation magnesium removal of middle-low-grade phosphorite and application of combined inhibitor

By using a combination of sodium sulfate, 1,2,4-butanetricarboxylic acid and sulfuric acid as inhibitors, the problem of efficient removal of magnesium from medium and low-grade phosphate ores was solved, the grade of phosphate concentrate and flotation efficiency were improved, and costs and environmental impacts were reduced.

CN120790380APending Publication Date: 2025-10-17KUNMING UNIV OF SCI & TECH
0 Cites 0 Cited by

Patent Information

Application Number
CN202511128754.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-13
Publication Date
2025-10-17

AI Technical Summary

Technical Problem

In existing technologies, magnesium removal from medium- and low-grade phosphate rock is difficult to achieve efficiently, affecting the quality of phosphate concentrate and subsequent processing. Furthermore, the use of single inorganic acid inhibitors is large, causing corrosion to equipment and making wastewater treatment difficult.

Method used

A combination of sodium sulfate, 1,2,4-butanetricarboxylic acid, and sulfuric acid was used as inhibitors to achieve efficient separation of phosphate rock and magnesium gangue through the flotation process. By utilizing the selective adsorption of carboxyl groups and the buffering effect of sulfate, the amount of sulfuric acid used was reduced and the flotation efficiency was improved.

Benefits of technology

The P2O5 grade in phosphate concentrate was increased to over 26%, and the MgO content was reduced to below 1%, which improved flotation efficiency, reduced acidic wastewater and solid waste, and reduced equipment corrosion and treatment difficulty.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to a combined inhibitor for reverse flotation magnesium removal of medium-low grade phosphorite and application thereof. The combined inhibitor comprises sodium sulfate, 1, 2, 4-butanetricarboxylic acid and sulfuric acid. The application method comprises the following steps: grinding raw ore, adding water and mixing to obtain ore pulp; the pH of the ore pulp is adjusted, then the combined inhibitor is sequentially added and mixed, then a collecting agent is added and mixed, flotation is conducted, and phosphate concentrate and phosphate tailings are obtained; the flotation process comprises one-time rough flotation, at least one-time fine flotation and at least one-time scavenging; the combined inhibitor provided by the invention is good in calcium and magnesium interference resistance and high in selectivity, the dosage of sulfuric acid is remarkably reduced, the pH value of ore pulp is increased, magnesian gangue in phosphorite is effectively removed through the synergistic effect of all the components, the grade of phosphate concentrate is increased, meanwhile, the recovery rate is high, and the combined inhibitor has good industrial application prospects.
Need to check novelty before this filing date? Find Prior Art