List of Articles Acid leaching

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  1 - The petrology and geochemistry of Sorkheh-Dizaj intrusive rocks in northern Zanjan and its effects on recovery of LREE from tailingby digestion-water leaching processes, Iran
  Ahmad Adib Esmaeil Rahimi
  10.30495/ijes.2023.1936911.1639
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  2 - Toluene abatement from polluted air over CeO2-doped Pd/Al2O3-clinoptilolite nanocatalyst via low temperature catalytic oxidation
  مریم حسینی محمد حقیقی
  Technologies such as thermal and catalytic oxidation or biological treatment are used to remove or reduce volatile organic compounds (VOCs) which are a major part of air pollutants. Nowadays use of nanocatalysts to remove environmental pollutants are highly regarded. In More

  Technologies such as thermal and catalytic oxidation or biological treatment are used to remove or reduce volatile organic compounds (VOCs) which are a major part of air pollutants. Nowadays use of nanocatalysts to remove environmental pollutants are highly regarded. In this work, the composite of Al2O3/CeO2/Clinoptilolite was synthesized, and then palladium active phase has been loaded on it by ultrasonic irradiation. Ultrasonic irradiation causes the profit description of active metal and improves structural properties of nanocatalysts. The purpose of using this catalyst is to take advantage of high specific surface area of alumina, acidic characteristic of clinoptilolite, and unique properties of CeO2 at the same time. Existence of CeO2 in catalyst causes increasing storage of oxygen, improving thermal and structural stability of composite and appropriate distribution of palladium metal on it. Characteristics of nanocatalysts are determined by XRD, FESEM, BET, FTIR, and EDX analyses. Gas chromatography and catalytic oxidation pilot are used for evaluation of catalytic performance toward toluene abatement from polluted air. XRD analysis results showed that the nanocatalysts have nanometer dimension crystals. BET analysis showed that the synthesized nanocatalysts have high specific surface areas. The reactor test results confirmed that the composite nanocatalysts have activity and absorption ability on toluene abatement. Manuscript profile
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  3 - Silver recovery from tailing dam of Ahangaran mine using leaching method
  امیر مجتهدی اصغر عزیزی محمد کارآموزیان
  Feasibility of extraction of silver from tailing dam of Ahangaran mine was investigated by various leaching reagents including sulfuric acid, nitric acid, hydrochloric acid and sodium cyanide. The influence of mineral acids concentration indicats that the maximum silver More

  Feasibility of extraction of silver from tailing dam of Ahangaran mine was investigated by various leaching reagents including sulfuric acid, nitric acid, hydrochloric acid and sodium cyanide. The influence of mineral acids concentration indicats that the maximum silver recovery is obtained with 6 M hydrochloric acid, 4 M sulphuric acid and 5 M nitric acid and at leaching time of 80 min. The further increase in sulfuric and hydrochloric acid concentrations had no considerable effect on the increment of silver recovery. The role of H2O2 as oxidant agent was also evaluated on silver recovery. The results demonstrated that the most silver recoveries by sulphuric acid obtained at 2 M H2O2, and thereafter recovery reduced with increasing the H2O2 concentration. In addition, statistical design of experiments was used to evaluate the influential factors in the silver recovery using sodium cyanide. The findings indicated that among main factors, solid percentage and among interactions, interactive effect of solid percentage and pH had the most influence on silver extraction rate. The maximum silver recovery )58.16 %( using sodium cyanide was achieved under following conditions: the pH ~11, solid percentage of 20, particles size of 75 μm )200 mesh(, 0.1185 g/t NaCN, and leaching time of 4 h. Manuscript profile