Patents by Inventor Dogan PAKTUNC

Dogan PAKTUNC has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Carbothermic direct reduction of chromite using a catalyst for the production of ferrochrome alloy
    Patent number: 10982300
    Abstract: A direct reduction process for the production of ferrochrome from chromite ore or concentrate is disclosed. According to the present invention, calcium chloride (CaCl2) is added as a catalyst to accelerate the solid reduction and enhance the particle growth of the metallic phase (i.e. ferrochrome) during reduction. The reduction of chromite ore or concentrate takes place at much lower temperatures (e.g. 1200 to 1400° C.) compared to the conventional smelting technologies, and the ferrochrome particles formed are segregated from the unwanted residual gangue and spinel particles, facilitating their subsequent physical separation.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: April 20, 2021
    Assignee: Her Majesty the Queen in Right of Canada as represented by the Minister of Natural Resources
    Inventors: Dawei Yu, Dogan Paktunc
  • CARBOTHERMIC DIRECT REDUCTION OF CHROMITE USING A CATALYST FOR THE PRODUCTION OF FERROCHROME ALLOY
    Publication number: 20200377969
    Abstract: A direct reduction process for the production of ferrochrome from chromite ore or concentrate is disclosed. According to the present invention, calcium chloride (CaCl2) is added as a catalyst to accelerate the solid reduction and enhance the particle growth of the metallic phase (i.e. ferrochrome) during reduction. The reduction of chromite ore or concentrate takes place at much lower temperatures (e.g. 1200 to 1400° C.) compared to the conventional smelting technologies, and the ferrochrome particles formed are segregated from the unwanted residual gangue and spinel particles, facilitating their subsequent physical separation.
    Type: Application
    Filed: August 2, 2017
    Publication date: December 3, 2020
    Inventors: Dawei YU, Dogan PAKTUNC
  • Method of direct reduction of chromite with cryolite additive
    Patent number: 10358693
    Abstract: A method of chromite reduction using cryolite (Na3AlF6) as an additive. The cryolite used may be pure cryolite or an impure mixture containing cryolite, such as the bath material produced as waste or as a by-product of aluminum smelting processes. In one embodiment, the reduction product is re-melted at a higher temperature to form larger metallic particles. In another embodiment, the chromite ore is granulated with cryolite particles and carbon reductant particles before being reduced.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: July 23, 2019
    Assignee: HER MAJESTY THE QUEEN IN RIGHT OF CANADA, AS REPRESENTED BY THE MINISTER OF NATURAL RESOURCES
    Inventors: Samira Sokhanvaran, Dogan Paktunc
  • METHOD OF DIRECT REDUCTION OF CHROMITE WITH CRYOLITE ADDITIVE
    Publication number: 20190119784
    Abstract: A method of chromite reduction using cryolite (Na3AlF6) as an additive. The cryolite used may be pure cryolite or an impure mixture containing cryolite, such as the bath material produced as waste or as a by-product of aluminum smelting processes. In one embodiment, the reduction product is re-melted at a higher temperature to form larger metallic particles. In another embodiment, the chromite ore is granulated with cryolite particles and carbon reductant particles before being reduced.
    Type: Application
    Filed: October 20, 2017
    Publication date: April 25, 2019
    Inventors: Samira SOKHANVARAN, Dogan PAKTUNC