Method for preparing iron phosphate by hydrogen-based micro-reduction roasting reinforced iron ore acid dissolution

By combining hydrogen micro-reduction roasting with expansion roasting technology, the crystal structure of iron oxide ore is destroyed, Fe3+ is reduced to Fe2+, the acid dissolution efficiency is improved, the problem of difficult dissolution of iron oxide ore is solved, and efficient, low-cost and environmentally friendly iron phosphate preparation is achieved.

CN120793864APending Publication Date: 2025-10-17CENT SOUTH UNIV
0 Cites 1 Cited by

Patent Information

Application Number
CN202510704348.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-29
Publication Date
2025-10-17

AI Technical Summary

Technical Problem

In traditional methods, the dense crystal structure of iron oxide ore results in poor solubility in acidic solutions, making it difficult to prepare high-purity iron phosphate. Furthermore, traditional reduction methods are energy-intensive and produce harmful gases, making it difficult to meet green and environmentally friendly requirements.

Method used

By employing hydrogen micro-reduction roasting combined with expansion roasting technology, the crystal structure of iron ore is destroyed, the specific surface area is increased, and Fe3+ is reduced to Fe2+ by controlling the hydrogen reduction conditions and roasting temperature, thereby enhancing acid dissolution efficiency.

Benefits of technology

It significantly improves the acid dissolution efficiency of iron ore, reduces acid consumption and energy consumption, achieves green production, reduces the production cost of iron phosphate, and meets the requirements of sustainable development.

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

Abstract

The invention discloses a method for preparing iron phosphate through hydrogen-based micro-reduction roasting reinforced iron ore acid dissolution. The method comprises the following steps that (1) iron ore is pretreated into iron ore powder with D90 smaller than 74 micrometers; (2) hydrogen is introduced into the iron ore powder within the temperature range of 700-900 DEG C for micro-reduction roasting, the hydrogen flux of each kilogram of iron ore is 10-60 L / min, the roasting time is 5-30 min, and micro-reduction iron ore powder is obtained after cooling; (3) adding the micro-reduced iron ore powder into a mixed acid solution, adding a proper amount of a hydrogen peroxide solution, stirring and leaching at a set temperature to obtain a leaching mixed solution, and carrying out solid-liquid separation on the leaching mixed solution to obtain leaching residues and a leaching solution; (4) adjusting the pH value of the leachate, heating to a preset temperature, carrying out auxiliary stirring reaction, aging and filtering to obtain crude iron phosphate; and (5) calcining the crude iron phosphate, and cooling to obtain the battery-grade iron phosphate. By means of the method, the acid dissolution efficiency of the iron ore can be effectively improved, acid consumption and energy consumption are reduced, meanwhile, green production can be achieved, and the requirement for sustainable development is met.
Need to check novelty before this filing date? Find Prior Art