Patents by Inventor Archana Agrawal

Archana Agrawal 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).

  • Process for recovery of gallium
    Patent number: 7338589
    Abstract: The present invention relates to a process for the recovery of gallium from Bayer process liquors. Bayer process liquor is obtained from alumina industries and contains 450 g/L Na2O, 80 g/L Al2O3 and 190±20 ppm of gallium. The present invention utilizes an organic and inorganic phase for a two stage separation process to recover gallium with high purity.
    Type: Grant
    Filed: March 20, 2003
    Date of Patent: March 4, 2008
    Assignee: Council of Scientific and Industrial Research
    Inventors: Patcha Ramachandra Rao, Puvvada George Vijay Kumar, Archana Agrawal, Indranil Chattoraj
  • Process for recovery of iron from copper slag
    Publication number: 20070283785
    Abstract: The present invention relates to a process for recovery of iron from copper slag. This invention particularly relates to a process for recovery of iron from a waste like granulated copper slag generated during the production of copper from its ores by a pyrometallurgical method. The present invention will be useful for solving the ecological and environmental issues with an added economic advantage of utilising the dump slag generated in the copper plants. Novelty of the present invention is process for the preparation of value added products viz grinding grade cast iron using copper slag generated during the processing of copper concentrate which otherwise is considered as a waste. Other novel features of the inventions are creating a homogeneous mixture of slag, reductant and flux so that reaction kinetics is more than conventional process. The reductant is used in such a way so that maximum recovery of iron can take place.
    Type: Application
    Filed: March 21, 2006
    Publication date: December 13, 2007
    Inventors: Archana Agrawal, Kanai Sahoo, Sukomal Ghosh, Banshi Pandey
  • Process for recovery of gallium
    Publication number: 20040042945
    Abstract: The present invention relates to a process for the recovery of gallium from Bayer process liquors. Bayer process liquor is obtained from alumina industries and contains 450 g/L Na2O, 80 g/L Al2O3 and 190±20 ppm of gallium. The present invention utilizes an organic and inorganic phase for a two stage separation process to recover gallium with high purity.
    Type: Application
    Filed: March 20, 2003
    Publication date: March 4, 2004
    Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
    Inventors: Patcha Ramachandra Rao, Puvvada George Vijay Kumar, Archana Agrawal, Indranil Chattoraj