Patents by Inventor M. A. Halim

M. A. Halim 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).

  • Patent number: 9732398
    Abstract: A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent extraction step using an oxime to obtain a solution of organic solvent containing gold, which is stripped with sodium thiosulphate to recover gold. The extraction may be operated to extract gold with or without iron. Materials used in the process may be recycled. The process avoids environmental and other hazards associated with the use of cyanide to extract gold.
    Type: Grant
    Filed: April 8, 2013
    Date of Patent: August 15, 2017
    Assignee: Process Research Ortech Inc.
    Inventors: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, M. A. Halim
  • Patent number: 9115419
    Abstract: A process for the extraction of rare earth elements, including yttrium, from a rare earth element-bearing ore or concentrate, comprising the steps of leaching the rare earth element-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of from 90° C. to the boiling point of the solution and at an Eh of at least 200 mV. After a liquid/solids separation step, the solution obtained is subjected to steps for removal of iron and for recovery of rare earth elements. Alternatively, rare earth element-bearing ore or concentrate may be leached with sulphuric acid and liquid obtained subjected to extraction of iron and other impurities. Raffinate obtained may be treated with oxalic acid, the precipitate dissolved in hydrochloric acid and subjected to solvent extraction for rare earth elements or the raffinate may be subjected to solvent extraction for removal of rare earth elements and then stripped with hydrochloric acid.
    Type: Grant
    Filed: April 8, 2013
    Date of Patent: August 25, 2015
    Assignee: PROCESS RESEARCH ORTECH INC.
    Inventors: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, M. A. Halim
  • Patent number: 8916116
    Abstract: The invention provides a process for the leaching of a laterite ore, concentrate, tailings or waste rock for the recovery of value metals, at least one value metal being nickel. The laterite ore or concentrate is subjected to a leaching step with a lixiviant comprising hydrochloric acid to leach nickel from the laterite ore, followed by a liquid/solids separation step. The liquid obtained is subject to solvent extraction with a dialkyl ketone, to obtain a solution rich in iron and a raffinate. Separation of iron from cobalt and nickel is obtained.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: December 23, 2014
    Assignee: Process Research Ortech inc.
    Inventors: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, Jonathan Chen, M. A. Halim, Robert DeLaat
  • Publication number: 20130283976
    Abstract: A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent extraction step using an oxime to obtain a solution of organic solvent containing gold, which is stripped with sodium thiosulphate to recover gold. The extraction may be operated to extract gold with or without iron. Materials used in the process may be recycled. The process avoids environmental and other hazards associated with the use of cyanide to extract gold.
    Type: Application
    Filed: April 8, 2013
    Publication date: October 31, 2013
    Inventors: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, M. A. Halim
  • Publication number: 20130283977
    Abstract: A process for the extraction of rare earth elements, including yttrium, from a rare earth element-bearing ore or concentrate, comprising the steps of leaching the rare earth element-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of from 90° C. to the boiling point of the solution and at an Eh of at least 200 mV. After a liquid/solids separation step, the solution obtained is subjected to steps for removal of iron and for recovery of rare earth elements. Alternatively, rare earth element-bearing ore or concentrate may be leached with sulphuric acid and liquid obtained subjected to extraction of iron and other impurities. Raffinate obtained may be treated with oxalic acid, the precipitate dissolved in hydrochloric acid and subjected to solvent extraction for rare earth elements or the raffinate may be subjected to solvent extraction for removal of rare earth elements and then stripped with hydrochloric acid.
    Type: Application
    Filed: April 8, 2013
    Publication date: October 31, 2013
    Inventors: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, M. A. Halim
  • Publication number: 20130149219
    Abstract: The invention provides a process for the leaching of a laterite ore, concentrate, tailings or waste rock for the recovery of value metals, at least one value metal being nickel. The laterite ore or concentrate is subjected to a leaching step with a lixiviant comprising hydrochloric acid to leach nickel from the laterite ore, followed by a liquid/solids separation step. The liquid obtained is subject to solvent extraction with a dialkyl ketone, to obtain a solution rich in iron and a raffinate. Separation of iron from cobalt and nickel is obtained.
    Type: Application
    Filed: December 12, 2012
    Publication date: June 13, 2013
    Inventors: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, Jonathan Chen, M. A. Halim, Robert DeLaat