Title:
METHOD FOR PREPARING IRON PHOSPHATE BY USING PHOSPHORITE AND FERROUS SULFATE
Document Type and Number:
WIPO Patent Application WO/2024/055467
Kind Code:
A1
Abstract:
Provided is a method for preparing iron phosphate by using phosphorite and ferrous sulfate. The method comprises the following steps: 1) mixing and reacting phosphorite and phosphoric acid with water to obtain a pretreated phosphorite slurry; 2) mixing and reacting the pretreated phosphorite slurry with a ferrous sulfate solution, and performing filtration to obtain phosphogypsum and an iron-phosphorus mixed solution; and 3) adding ferrous sulfate and water to the iron-phosphorus mixed solution to obtain an iron-phosphorus solution with aniron ion concentration of 0.5-1.0 mol/L and a P/Fe molar ratio of 1.0-1.4, and then dropwise adding hydrogen peroxide, and performing heating and aging, filtration, and rinsing to obtain iron phosphate. Phosphorite is used as a phosphorus source in the method, which not only greatly reduces the cost of the phosphorus source in an iron phosphate process, and thus reduces the cost of raw materials for synthesizing iron phosphate, but also greatly improves the tap density of the iron phosphate.
Inventors:
XU SHANWAN (CN)
LI JIN (CN)
GUO MIYAN (CN)
LI JIN (CN)
GUO MIYAN (CN)
Application Number:
PCT/CN2022/141946
Publication Date:
March 21, 2024
Filing Date:
December 26, 2022
Export Citation:
Assignee:
HUBEI HONGRUN HI TECH NEW MAT CO LTD (CN)
International Classes:
C01B25/37
Foreign References:
| CN115340078A | 2022-11-15 | |||
| CN109928375A | 2019-06-25 | |||
| CN113184819A | 2021-07-30 | |||
| US20150017256A1 | 2015-01-15 |
Attorney, Agent or Firm:
ZHONG LUN LAW FIRM (CN)
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