List of Articles زیرکن

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  1 - Evaluating the Effective Parameters in the Zircon Alkali Decomposition Process and Determining the Optimal Operating Conditions for Zirconium Extraction
  Ali Yadollahi M. Torab-Mostaedi Kamal Saberayn Amir Charkhi
  10.30495/apme.2021.1919216.2021
  Alkali decomposition with NaOH is the most commonly used method for extraction of zirconium from zircon mineral. This process includes alkali fusion, water leaching and acid leaching steps. In this study, Taguchi method was utilized to find the optimum operational condi More

  Alkali decomposition with NaOH is the most commonly used method for extraction of zirconium from zircon mineral. This process includes alkali fusion, water leaching and acid leaching steps. In this study, Taguchi method was utilized to find the optimum operational conditions of alkali decomposition process. The results showed that under the optimal conditions of NaOH/ZrSiO4 mole ratio of 6:1, NaOH concentration of 30% and fusion temperature of 650 °C, 98.6% of the initial zircon was decomposed, as no pick of ZrSiO4 was observed in the XRD pattern of the alkali fusion product. The conditions of water leaching step were investigated as well, and under the optimal conditions of, liquid–solid ratio of 5:1, leaching temperature of 30 °C and leaching three times, 96.2% of sodium and 77.9% of silica content in the alkali fusion product were removed. The crystal phase structures of ZrO2 and SiO2 were observed in the residual solid after heat treatment. In the acid leaching step, leaching with 4 mol/L sulfuric acid with liquid/solid ratio of 20 at temperature of 60 °C, resulted in 92.73% recovery of zirconium and the silica content in the acid leaching solution was obtained 31 ppm. Results of this research suggest the optimal operational conditions of the facile, low price and proper industrial method for recovery of zirconium from zircon mineral. Manuscript profile
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  2 - Preparation of zirconia Nanopowder from the product of the acid washing stage of Alkali fusion of Zircon: investigation of the parameters of the preparation stage of zirconia Nanopowder by precipitation method
  Yasaman Jalinousi Kamal Saberayn
  The purpose of this research is to perform the process of extracting zirconium from zircon mineral by alkali fusion method and determining the optimal operating conditions for preparing zirconia nanopowder from the solution of the acid leaching step.Alkali fusion proces More

  The purpose of this research is to perform the process of extracting zirconium from zircon mineral by alkali fusion method and determining the optimal operating conditions for preparing zirconia nanopowder from the solution of the acid leaching step.Alkali fusion process of zircon includes three stages of melting zircon with alkali, water leaching and acid leaching.The final product obtained from the reaction of melting zircon with alkali has in the desired state a powdery form and includes sodium silicate and sodium zirconate.Sodium silicate is soluble in water and as a result it is removed from the powder after the water leaching step.In order to further enrich the powder and separate silica, unreacted zircon and other remaining impurities, this powder is leached by an acid.The optimal parameters of the steps of melting with alkali, washing and acid washing have been used from past researches to achieve the highest amount of zirconium and remove the largest amount of silica.In order to determine the optimal conditions for the production of zirconia nanopowder,the effect of pH, type and mass ratio of surfactant to zirconium and calcination temperature were investigated.The results of the investigations showed that the optimal conditions for the deposition stage are pH equal to 7,the polyvinyl pyrrolidone as a surfactant with a mass ratio of surfactant to zirconium of 0.82 and the calcination temperature of 300 degrees Celsius.Under these conditions, particles with dimensions of 27.1nm were obtained from artificial zirconium solution and particles with dimensions of 26.6nm were obtained from real zirconium solution. Manuscript profile