DHE Minerals
Hydrometallurgy Research Services
Selected Projects Supervised or Conducted

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Base metals & gold industries
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Literature review of “Gold leaching from ores using biogenic lixiviants”.
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Indirect bioleaching in the heap leach No.1 of the Sarcheshmeh copper mine.
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Formation of jarosite and its effect on important ions for Acidithiobacillus ferrooxidans bacteria, Sarcheshmeh low-grade copper ore.
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Bioleaching of Sarcheshmeh copper flotation concentrate.
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Chloride leaching of Sarcheshmeh copper flotation concentrate.
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Optimization of reagent dosages in the rougher flotation circuit of the Sungun copper concentrator plant to increase copper recovery.
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Bioleaching of Talmesi poly-metal (Cu, Co, Ni) ore.
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Occurrence mechanism of silicate and aluminosilicate minerals in Sarcheshmeh copper flotation concentrate.
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Leaching of Co, Ni and Zn from Zarin Rooy cold filter cake residue.
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Optimization of flotation variables to decrease aluminum oxide and silicon dioxide in the copper-molybdenum flotation concentrate at the Sarcheshmeh mine.
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Effects of soluble ions in the chloride leach solution on the leaching of lead from the cake residue of the zinc hydrometallurgical process.
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Optimization of gold cyanidation (Sebandoon ore sample).
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Optimization of flotation variables for Ravang (Block No. C) zinc and lead ore sample.
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Literature review of “Challenges with elemental sulfur removal during the leaching of copper and zinc sulfides, and in the residues”.
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Literature review of “Hydrometallurgical Processing of Non-Sulfide Zinc Ores”.
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Modeling of Al2O3 leaching recovery in the Bayer process (Jajarm alumina plant).
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Beneficiation of Jajarm low-grade bauxite using gravity separation techniques and flotation.
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Process review of “Razgah nepheline syenite alumina production EPCM project”.
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Rare Earth Elements & Niobium industries
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Rare earth elements R&D gaps analysis for the development of Canadian deposits, 2016. in Collaboration with Queen's University.
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Flowsheet development for mixed rare earth elements production from apatite leaching aqueous solution using biosorption and precipitation
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Rare Earth Elements distribution in products of the Chadormalu Iron Ore Concentrator Plant.
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Leaching of rare earth elements from Chadormalu apatite concentrate (laboratory scale).
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Production of rare earth elements from apatite leach liquor using tributyl phosphate (TBP) extraction and precipitation stripping using oxalic acid.
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Study of the surface chemistry of niobium and rare earth minerals by using XPS, TOF-SIMS, and SEM-EDX (Niobec plant).
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Separation of pyrochlore from other minerals by flotation (Niobec plant).
Iron, Graphite & Coal Industries
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Mathematical modeling to predict the properties of coal (Hardgrove Grindability Index (HGI), and Free Swelling Index (FSI)) based on the analyses of U.S. coals.
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Mathematical modeling to predict the properties of coal (Calorific Value (CV), and Ash Fusion Temperatures (AFTs)) based on the analyses of U.S. coals.
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Determination of different forms of organic and inorganic sulfur in Tabas coal samples.
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Evaluation of the effects of irradiation (ultrasound and microwave) on organic sulfur functionalities in coal using Atmospheric Pressure - Temperature Program Reduction.
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Distributions of coal group macerals in different size fractions and their effect on a flotation system (Central Alborz coal mine).
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Production of ultra clean coal from concentrates produced at the Tabas and Central Alborz coal preparation plants using sequential leaching with HF followed by HNO3 .
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Beneficiation of Jalal Abad iron ore (ore type No. D2).
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Process review for the Sangan Iron Ore EPCM project.
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Literature review of “graphite beneficiation techniques”.
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Roasting and leaching of Woxana graphite to decrease sulfur and iron content to less than 0.5%.
Potash industry
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Extraction of KCl from Carnallite with a high concentration of sodium chloride as an impurity using decomposition-direct flotation.