Patents by Inventor Narain Hariharan

Narain Hariharan 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: 11919813
    Abstract: A lime-based cement extender composition, and associated systems and methods are disclosed herein. In some embodiments, the lime-based cement extender composition includes 5-20% by weight lime particles, 40-50% by weight limestone particles, and 40-50% by weight pozzolan particles. Additionally or alternatively, the lime-based cement extender composition can comprise a calcium oxide concentration of 45-65%, a magnesium oxide concentration of 0.5-2%, an iron oxide concentration of 0.5-2.0%, an aluminum oxide concentration of 2-8%, a silicon dioxide concentration of 20-40%, a potassium oxide concentration of 20,000-30,000 ppm, and a sodium oxide concentration of 10,000-20,000 ppm. In some embodiments, the lime-based cement extender composition, or product, is combined with cement to produce a cement blend for use in the mining industry as mine backfill.
    Type: Grant
    Filed: December 22, 2022
    Date of Patent: March 5, 2024
    Assignee: Graymont Western Canada Inc.
    Inventors: Nikolas Andrei Romaniuk, Michael John Tate, Narain Hariharan, Jared Ira Leikam, Katherine Hyman, Lucas McFarlane, Joseph Lewis
  • Publication number: 20240025778
    Abstract: Methods and systems for treating tailings at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises (i) providing a tailings stream comprising bicarbonates and a pH less than 9.0, (ii) adding a coagulant comprising calcium hydroxide to the tailings stream to form a mixture having a pH of at least 11.5 and a soluble calcium level no more than 800 mg/L, and (iii) dewatering the mixture to produce a product having a solids content of at least 40% by weight. In some embodiments, the pH and soluble calcium level of the mixture cause chemical modification of clay materials of the mixture via pozzolanic reactions. In some embodiments, the undrained shear strength of the product increases over a period of time of at least two days.
    Type: Application
    Filed: June 22, 2023
    Publication date: January 25, 2024
    Inventors: Nikolas Andrei Romaniuk, Jared Ira Leikam, Jesse Wayne Fox, Michael John Tate, Narain Hariharan
  • Publication number: 20240002733
    Abstract: Methods and systems for calcining dewatered tailings and/or mine waste are disclosed herein. In some embodiments, the method comprises (i) processing dewatered tailings comprising clay minerals, (ii) calcining the processed tailings to produced calcined tailings, and (iii) altering a composition and/or one or more characteristics of the calcined tailings to produce a cementitious product. Altering the composition can include blending the calcined tailings with one or more additives, such as lime, dolomitic lime, lime kiln dust, argillaceous limestone, limestone, pulverized quicklime, ground calcium carbonate, quicklime, gypsum, natural pozzolans, artificial pozzolans, water, flow aids, or the like.
    Type: Application
    Filed: June 22, 2023
    Publication date: January 4, 2024
    Inventors: Nikolas Andrei Romaniuk, Michael John Tate, Jared Ira Leikam, Jesse Wayne Fox, Narain Hariharan
  • Publication number: 20230416151
    Abstract: A composition configured to be mixed with cement, and associated systems and methods are disclosed herein. In some embodiments, the composition includes at least 10% by weight lime particles, and at least 35% by weight pozzolan particles. Properties of the composition can include a magnesium oxide concentration of at least 0.5%, and an iron oxide concentration of at least 0.5-2.0%, an aluminum oxide concentration of 2-8%, a silicon dioxide concentration of 20-40%, a potassium oxide concentration of 20,000-30,000 ppm, and a sodium oxide concentration of 10,000-20,000 ppm. In some embodiments, the lime-based cement extender composition, or product, is combined with cement to produce a cement blend for use in the mining industry as mine backfill.
    Type: Application
    Filed: September 6, 2023
    Publication date: December 28, 2023
    Inventors: Nikolas Andrei Romaniuk, Michael John Tate, Narain Hariharan, Jared Ira Leikam, Katherine Hyman, Lucas McFarlane, Joseph Lewis
  • Publication number: 20230255196
    Abstract: Prilled lime compositions and associated systems and methods are disclosed herein. In some embodiments, the prilled lime composition comprises 1-10% by weight of a binder; 45-75% by weight calcium hydroxide; no more than 30% magnesium oxide; and 1-10% water. The binder can include molasses, sodium lignosulfonate, calcium lignosulfonate, starch, sodium silicate, or bentonite.
    Type: Application
    Filed: February 15, 2023
    Publication date: August 17, 2023
    Inventors: Narain Hariharan, Ian Cook, Michael John Tate
  • Patent number: 11724946
    Abstract: Methods and systems for treating tailings at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises (i) providing a tailings stream comprising bicarbonates and a pH less than 9.0, (ii) adding a coagulant comprising calcium hydroxide to the tailings stream to form a mixture having a pH of at least 11.5 and a soluble calcium level no more than 800 mg/L, and (iii) dewatering the mixture to produce a product having a solids content of at least 40% by weight. In some embodiments, the pH and soluble calcium level of the mixture cause chemical modification of clay materials of the mixture via pozzolanic reactions. In some embodiments, the undrained shear strength of the product increases over a period of time of at least two days.
    Type: Grant
    Filed: December 16, 2020
    Date of Patent: August 15, 2023
    Assignee: Graymont Western Canada Inc.
    Inventors: Jared Ira Leikam, Nikolas Andrei Romaniuk, Jesse Wayne Fox, Michael John Tate, Narain Hariharan
  • Patent number: 11725148
    Abstract: Methods and systems for calcining dewatered tailings and/or mine waste are disclosed herein. In some embodiments, the method comprises (i) processing dewatered tailings comprising clay minerals, (ii) calcining the processed tailings to produced calcined tailings, and (iii) altering a composition and/or one or more characteristics of the calcined tailings to produce a cementitious product. Altering the composition can include blending the calcined tailings with one or more additives, such as lime, dolomitic lime, lime kiln dust, argillaceous limestone, limestone, pulverized quicklime, ground calcium carbonate, quicklime, gypsum, natural pozzolans, artificial pozzolans, water, flow aids, or the like.
    Type: Grant
    Filed: December 23, 2021
    Date of Patent: August 15, 2023
    Assignee: Graymont Western Canada Inc.
    Inventors: Nikolas Andrei Romaniuk, Michael John Tate, Jared Ira Leikam, Jesse Wayne Fox, Narain Hariharan
  • Patent number: 11718543
    Abstract: Methods and systems for treating tailings at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises (i) providing a tailings stream comprising bicarbonates and a pH less than 9.0, (ii) adding a coagulant comprising calcium hydroxide to the tailings stream to form a mixture having a pH of at least 11.5 and a soluble calcium level no more than 800 mg/L, and (iii) dewatering the mixture to produce a product having a solids content of at least 40% by weight. In some embodiments, the pH and soluble calcium level of the mixture cause chemical modification of clay materials of the mixture via pozzolanic reactions. In some embodiments, the undrained shear strength of the product increases over a period of time of at least two days.
    Type: Grant
    Filed: December 16, 2020
    Date of Patent: August 8, 2023
    Assignee: Graymont Western Canada Inc.
    Inventors: Nikolas Andrei Romaniuk, Jared Ira Leikam, Jesse Wayne Fox, Michael John Tate, Narain Hariharan
  • Publication number: 20230202925
    Abstract: A lime-based cement extender composition, and associated systems and methods are disclosed herein. In some embodiments, the lime-based cement extender composition includes 5-20% by weight lime particles, 40-50% by weight limestone particles, and 40-50% by weight pozzolan particles. Additionally or alternatively, the lime-based cement extender composition can comprise a calcium oxide concentration of 45-65%, a magnesium oxide concentration of 0.5-2%, an iron oxide concentration of 0.5-2.0%, an aluminum oxide concentration of 2-8%, a silicon dioxide concentration of 20-40%, a potassium oxide concentration of 20,000-30,000 ppm, and a sodium oxide concentration of 10,000-20,000 ppm. In some embodiments, the lime-based cement extender composition, or product, is combined with cement to produce a cement blend for use in the mining industry as mine backfill.
    Type: Application
    Filed: December 22, 2022
    Publication date: June 29, 2023
    Inventors: Nikolas Andrei Romaniuk, Michael John Tate, Narain Hariharan, Jared Ira Leikam, Katherine Hyman, Lucas McFarlane, Joseph Lewis
  • Publication number: 20220411305
    Abstract: Methods and systems for reducing greenhouse gas emissions from sediments containing organic materials via treatment with lime are disclosed herein. In some embodiments, the method comprises (i) providing sediments comprising a first pH less than 10.0, fermentable organic materials, and microbes configured to produce carbon dioxide and/or methane via degradation of the organic material; (ii) adding a coagulant comprising lime to the sediment to produce a mixture comprising a second pH of at least 11.0 and excess soluble calcium ions; and (iii) after adding the coagulant, forming a buffer comprising soluble sodium and calcium bicarbonates within the mixture by enabling the excess soluble sodium and calcium ions to react with carbon dioxide. Forming the buffer can comprise decreasing the pH of the mixture from the second pH to a third pH of 8.0 or greater.
    Type: Application
    Filed: July 8, 2022
    Publication date: December 29, 2022
    Inventors: Nikolas Andrei Romaniuk, Michael John Tate, Narain Hariharan
  • Patent number: 11414335
    Abstract: Methods and systems for reducing greenhouse gas emissions from sediments containing organic materials via treatment with lime are disclosed herein. In some embodiments, the method comprises (i) providing sediments comprising a first pH less than 10.0, fermentable organic materials, and microbes configured to produce carbon dioxide and/or methane via degradation of the organic material; (ii) adding a coagulant comprising lime to the sediment to produce a mixture comprising a second pH of at least 11.0 and excess soluble calcium ions; and (iii) after adding the coagulant, forming a buffer comprising soluble sodium and calcium bicarbonates within the mixture by enabling the excess soluble sodium and calcium ions to react with carbon dioxide. Forming the buffer can comprise decreasing the pH of the mixture from the second pH to a third pH of 8.0 or greater.
    Type: Grant
    Filed: May 5, 2021
    Date of Patent: August 16, 2022
    Assignee: Graymont Western Canada Inc.
    Inventors: Nikolas Andrei Romaniuk, Michael John Tate, Narain Hariharan
  • Publication number: 20220195306
    Abstract: Methods and systems for calcining dewatered tailings and/or mine waste are disclosed herein. In some embodiments, the method comprises (i) processing dewatered tailings comprising clay minerals, (ii) calcining the processed tailings to produced calcined tailings, and (iii) altering a composition and/or one or more characteristics of the calcined tailings to produce a cementitious product. Altering the composition can include blending the calcined tailings with one or more additives, such as lime, dolomitic lime, lime kiln dust, argillaceous limestone, limestone, pulverized quicklime, ground calcium carbonate, quicklime, gypsum, natural pozzolans, artificial pozzolans, water, flow aids, or the like.
    Type: Application
    Filed: December 23, 2021
    Publication date: June 23, 2022
    Inventors: Nikolas Andrei Romaniuk, Michael John Tate, Jared Ira Leikam, Jesse Wayne Fox, Narain Hariharan
  • Publication number: 20210101807
    Abstract: Methods and systems for treating tailings at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises (i) providing a tailings stream comprising bicarbonates and a pH less than 9.0, (ii) adding a coagulant comprising calcium hydroxide to the tailings stream to form a mixture having a pH of at least 11.5 and a soluble calcium level no more than 800 mg/L, and (iii) dewatering the mixture to produce a product having a solids content of at least 40% by weight. In some embodiments, the pH and soluble calcium level of the mixture cause chemical modification of clay materials of the mixture via pozzolanic reactions. In some embodiments, the undrained shear strength of the product increases over a period of time of at least two days.
    Type: Application
    Filed: December 16, 2020
    Publication date: April 8, 2021
    Inventors: Jared Ira Leikam, Nikolas Andrei Romaniuk, Jesse Wayne Fox, Michael John Tate, Narain Hariharan
  • Publication number: 20210101808
    Abstract: Methods and systems for treating tailings at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises (i) providing a tailings stream comprising bicarbonates and a pH less than 9.0, (ii) adding a coagulant comprising calcium hydroxide to the tailings stream to form a mixture having a pH of at least 11.5 and a soluble calcium level no more than 800 mg/L, and (iii) dewatering the mixture to produce a product having a solids content of at least 40% by weight. In some embodiments, the pH and soluble calcium level of the mixture cause chemical modification of clay materials of the mixture via pozzolanic reactions. In some embodiments, the undrained shear strength of the product increases over a period of time of at least two days.
    Type: Application
    Filed: December 16, 2020
    Publication date: April 8, 2021
    Inventors: Nikolas Andrei Romaniuk, Jared Ira Leikam, Jesse Wayne Fox, Michael John Tate, Narain Hariharan
  • Patent number: 10894730
    Abstract: Methods and systems for treating tailings at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises (i) providing a tailings stream comprising bicarbonates and a pH less than 9.0, (ii) adding a coagulant comprising calcium hydroxide to the tailings stream to form a mixture having a pH of at least 11.5 and a soluble calcium level no more than 800 mg/L, and (iii) dewatering the mixture to produce a product having a solids content of at least 40% by weight. In some embodiments, the pH and soluble calcium level of the mixture cause chemical modification of clay materials of the mixture via pozzolanic reactions. In some embodiments, the undrained shear strength of the product increases over a period of time of at least two days.
    Type: Grant
    Filed: September 10, 2019
    Date of Patent: January 19, 2021
    Assignee: GRAYMONT (PA) INC.
    Inventors: Jared Ira Leikam, Nikolas Andrei Romaniuk, Jesse Wayne Fox, Michael John Tate, Narain Hariharan
  • Publication number: 20200079664
    Abstract: Methods and systems for treating tailings at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises (i) providing a tailings stream comprising bicarbonates and a pH less than 9.0, (ii) adding a coagulant comprising calcium hydroxide to the tailings stream to form a mixture having a pH of at least 11.5 and a soluble calcium level no more than 800 mg/L, and (iii) dewatering the mixture to produce a product having a solids content of at least 40% by weight. In some embodiments, the pH and soluble calcium level of the mixture cause chemical modification of clay materials of the mixture via pozzolanic reactions. In some embodiments, the undrained shear strength of the product increases over a period of time of at least two days.
    Type: Application
    Filed: September 10, 2019
    Publication date: March 12, 2020
    Inventors: Jared Ira Leikam, Nikolas Andrei Romaniuk, Jesse Wayne Fox, Michael John Tate, Narain Hariharan