There are plenty of hard-to-beneficiate iron ores and high-grade tailings in India and all over the world; As the volume of high-grade iron ores declines. Minerals phase transformation by hydrogen reduction (MPTH) can efficiently revitalize hard-to-beneficiate iron ore resources and tailings, turning the waste into profitable products. It may also improve the concentrate quality comparing to that from the previous method. From the economic and environmental aspects, MPTH is the most effective method to recover iron oxides. The clean minerals phase transformation by hydrogen reduction (MPTH) was proposed. Industrial utilization of limonite/goethite, limonite-hematite, sulfur-bearing refractory iron ore was achieved, where Sulfur-bearing minerals decomposed or formed sulfate after oxidation roasting. Sulfur content of iron ore concentrate was significantly reduced to 0.038 %.

1. Minerals phase transformation by hydrogen (MPTH)
reduction technology.
Dr. Hassan Z. Harraz
hharraz2006@yahoo.com
2024
The clean minerals phase transformation by hydrogen reduction
A n ea sy w a y to p r o ce s s h a r d - t o - b e n e f i c i a te I r o n O r e
@Hassan Harraz 2024
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@Hassan Harraz 2024
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DOI: 10.13140/RG.2.2.25226.44489

2. KEYWORDS
• Beneficiation of Refractory Iron Ores;
• Refractory Low Grade Iron Ore
• Magnetic Separation
• Phase Transformation
• Hydrogen-based Fluidized Bed Roasting
• Minerals Phase Transformation by Hydrogen reduction
• MPTH technology
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3. Highlights
❖ There are plenty of hard-to-beneficiate iron ores and high-grade tailings in India and all over the world;
As the volume of high-grade iron ores declines.
➢ Minerals phase transformation by hydrogen reduction (MPTH) can efficiently revitalize hard-to-
beneficiate iron ore resources and tailings, turning the waste into profitable products. It may also
improve the concentrate quality comparing to that from the previous method. From the economic
and environmental aspects, MPTH is the most effective method to recover iron oxides.
❖ The clean minerals phase transformation by hydrogen reduction (MPTH) was proposed.
❖ Industrial utilization of limonite/goethite, limonite-hematite, sulfur-bearing refractory iron ore was
achieved, where Sulfur-bearing minerals decomposed or formed sulfate after oxidation roasting.
➢ Sulfur content of iron ore concentrate was significantly reduced to 0.038 %.
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4. INTRODUCTION
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5. INTRODUCTION…………..(Cont.)
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6. WHAT IS MPTH
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7. HOW DOES MINERAL PHASE TRANSFER
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8. Schematic diagram of the suspension roasting (MPTH) system.
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9. HOW MPTH WORKS
Diagram shows the Multi-stage Processing Method
during suspension roasting system
Fe2O3•nH2O
Precise Control of Mineral Phase Transformation
Fe3O4
Isometric system
γFe2O3
Isometric system
Amorphous
FeCO3
Trigonal system
Fe2O3
Hexagonal system
Paramagnetic
Feromagnetic
Non-magnetic
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10. TECHNICAL COMPARISON
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11. • Refractory Low Grade Iron Ore
• Magnetic Separation
• Phase Transformation
• Hydrogen-based Fluidized Bed Roasting
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12. Distribution of iron in the sample before and after MPTH.
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13. TECHNICAL ADVANTAGES
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14. 14
GREEN H2
GREEN ELECTRICITY
GREEN IRON ORE
GREEN STEEL
MPTH
ZERO CARBON PROCESS ROADMAP

15. GLOBAL EXPERIMENTAL DATA
Industrialized Projects
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16. Pilot-scale MPTH System and Its Principle
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17. Schematic diagram of pilot-scale MPTH system (from Yu et al., 2023 ).
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18. COMPLETED EXPERIMENTS
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19. Jiuquan Iron & Steel (Group) Corporation (JISCO) PROJECT
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20. Zambia Iron-bearing Manganese Ore
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21. Hainan Mining Project
Raw Ore
Grade
40.6
Fe%
Fe in form of
Hematite and Magnetite
Capacity
2.0 million t/a
Built In
2023.7
Conventional
Method
Fe: 61~62%
Fe RR: 60~61%
MPTH Fe: 65.68%
Fe RR: 85.56%
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22. DAFENG PROJECT
Raw Ore
Grade
50.51
Fe%
Fe in form of
Hematite
Capacity
2.0 million t/a
About to build in
late 2023
Conventional
Method
Fe: 63.39%
MRR: 31.46%
MPTH Fe: 65.00%
Fe RR: 94.96%
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23. @Hassan Harraz 2024
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24. @Hassan Harraz 2024
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25. Conclusions
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27. Thank You For Your Attention !