公开(公告)号：US11919813B2

公开(公告)日：2024-03-05

申请号：US18087728

申请日：2022-12-22

Applicant: Graymont Western Canada Inc.

Inventor： Nikolas Andrei Romaniuk ,  Michael John Tate ,  Narain Hariharan ,  Jared Ira Leikam ,  Katherine Hyman ,  Lucas McFarlane ,  Joseph Lewis

IPC: C04B28/12 ,  C04B7/34 ,  C04B7/52 ,  C04B28/18 ,  C04B111/00 ,  C04B111/10

CPC classification number: C04B28/12 ,  C04B7/34 ,  C04B7/52 ,  C04B28/184 ,  C04B2111/00215 ,  C04B2111/00724 ,  C04B2111/10

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.

公开(公告)号：US20240002733A1

公开(公告)日：2024-01-04

申请号：US18339874

申请日：2023-06-22

Applicant: Graymont Western Canada Inc.

Inventor： Nikolas Andrei Romaniuk ,  Michael John Tate ,  Jared Ira Leikam ,  Jesse Wayne Fox ,  Narain Hariharan

IPC: C10G1/04 ,  C04B18/04 ,  C02F11/145 ,  C04B18/12

CPC classification number: C10G1/045 ,  C04B18/049 ,  C02F11/145 ,  C04B18/12 ,  C10G2300/80 ,  C02F2103/10

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.

公开(公告)号：US11724946B2

公开(公告)日：2023-08-15

申请号：US17123875

申请日：2020-12-16

Applicant: Graymont Western Canada Inc.

Inventor： Jared Ira Leikam ,  Nikolas Andrei Romaniuk ,  Jesse Wayne Fox ,  Michael John Tate ,  Narain Hariharan

IPC: C02F1/56 ,  B01D21/30 ,  C02F1/52 ,  C02F11/12 ,  C02F11/145 ,  C10G1/04 ,  F26B5/00 ,  B01D21/01 ,  B09B1/00 ,  B65G5/00 ,  C02F11/148 ,  C02F103/10 ,  E21B21/06 ,  E21B43/34

CPC classification number: C02F1/56 ,  B01D21/30 ,  C02F1/5245 ,  C02F11/12 ,  C02F11/145 ,  C10G1/045 ,  F26B5/005 ,  B01D21/01 ,  B09B1/00 ,  B65G5/00 ,  C02F1/5281 ,  C02F11/148 ,  C02F2103/10 ,  C02F2201/002 ,  E21B21/068 ,  E21B43/34

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.

公开(公告)号：US20220306509A1

公开(公告)日：2022-09-29

申请号：US17840297

申请日：2022-06-14

Applicant: Graymont Western Canada Inc.

Inventor： Michael John Tate ,  Jared Ira Leikam ,  Jesse Wayne Fox ,  Nikolas Andrei Romaniuk

IPC: C02F11/122 ,  C02F1/52 ,  C02F11/127 ,  C02F11/145 ,  C02F11/121 ,  C02F11/143

Abstract: Methods and systems for treating oil sands tailings streams at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises providing a tailings stream including 10-55% solids by total weight, increasing the pH of the tailings stream by combining the tailings stream with lime to produce a lime-tailings mixture having a pH of at least 11.0, and dewatering the lime-tailings mixture to produce a first stream having 10% or less solids by total weight and a second stream having 50% or more solids by total weight. The first stream can correspond to a release water stream, and the second stream can correspond to a cake. The lime slurry can include about 10% lime by total weight, and can comprise lime hydrate, quicklime, or a combination thereof. Dewatering the lime-tailings mixture can include routing the lime-tailings mixture to a centrifuge unit and/or a pressure or vacuum filtration unit.

公开(公告)号：US20220195306A1

公开(公告)日：2022-06-23

申请号：US17560884

申请日：2021-12-23

Applicant: Graymont Western Canada Inc.

Inventor： Nikolas Andrei Romaniuk ,  Michael John Tate ,  Jared Ira Leikam ,  Jesse Wayne Fox ,  Narain Hariharan

IPC: C10G1/04 ,  C04B18/04 ,  C02F11/145 ,  C04B18/12

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.

公开(公告)号：US20210292198A1

公开(公告)日：2021-09-23

申请号：US17316633

申请日：2021-05-10

Applicant: Graymont Western Canada Inc.

Inventor： Jesse Wayne Fox ,  Michael John Tate ,  Jared Ira Leikam ,  Nikolas Andrei Romaniuk

IPC: C02F1/52 ,  C02F1/38 ,  C02F1/00

Abstract: Methods and systems for treating oil sands tailings streams using multiple dosages of lime are disclosed herein. In some embodiments, the method comprises providing a tailings stream including 3-40% solids by total weight, combining the tailings stream with a first dosage of lime to produce a first mixture having a pH of less than 12.0, and then combining the first mixture with a polymer to produce a second mixture. In some embodiments, the method can further include combining the second mixture with a second dosage of lime to produce a third mixture having a pH greater than 12.0, and dewatering the third mixture in a centrifuge unit and/or a pressure filtration unit to produce a product stream having 55% or more solids by weight.

公开(公告)号：US12209039B2

公开(公告)日：2025-01-28

申请号：US18173394

申请日：2023-02-23

Applicant: Graymont Western Canada Inc.

Inventor： Jesse Wayne Fox ,  Michael John Tate ,  Jared Ira Leikam ,  Nikolas Andrei Romaniuk

IPC: C02F1/52 ,  C02F1/00 ,  C02F1/38 ,  C02F1/56 ,  C02F11/127 ,  C02F103/10

Abstract: Methods and systems for treating oil sands tailings streams using multiple dosages of lime are disclosed herein. In some embodiments, the method comprises providing a tailings stream including 3-40% solids by total weight, combining the tailings stream with a first dosage of lime to produce a first mixture having a pH of less than 12.0, and then combining the first mixture with a polymer to produce a second mixture. In some embodiments, the method can further include combining the second mixture with a second dosage of lime to produce a third mixture having a pH greater than 12.0, and dewatering the third mixture in a centrifuge unit and/or a pressure filtration unit to produce a product stream having 55% or more solids by weight.

公开(公告)号：US20240025778A1

公开(公告)日：2024-01-25

申请号：US18339892

申请日：2023-06-22

Applicant: Graymont Western Canada Inc.

Inventor： Nikolas Andrei Romaniuk ,  Jared Ira Leikam ,  Jesse Wayne Fox ,  Michael John Tate ,  Narain Hariharan

IPC: C02F1/56 ,  C02F1/52 ,  C02F11/12 ,  C02F11/145 ,  C10G1/04 ,  B01D21/30 ,  F26B5/00

CPC classification number: C02F1/56 ,  C02F1/5245 ,  C02F11/12 ,  C02F11/145 ,  C10G1/045 ,  B01D21/30 ,  F26B5/005 ,  C02F2201/002 ,  C02F1/5281 ,  C02F2103/10

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.

公开(公告)号：US11613485B2

公开(公告)日：2023-03-28

申请号：US17840297

申请日：2022-06-14

Applicant: Graymont Western Canada Inc.

Inventor： Michael John Tate ,  Jared Ira Leikam ,  Jesse Wayne Fox ,  Nikolas Andrei Romaniuk

IPC: C02F11/122 ,  C02F1/52 ,  C02F11/127 ,  C02F11/145 ,  C02F11/121 ,  C02F11/143 ,  C02F103/10

Abstract: Methods and systems for treating oil sands tailings streams at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises providing a tailings stream including 10-55% solids by total weight, increasing the pH of the tailings stream by combining the tailings stream with lime to produce a lime-tailings mixture having a pH of at least 11.0, and dewatering the lime-tailings mixture to produce a first stream having 10% or less solids by total weight and a second stream having 50% or more solids by total weight. The first stream can correspond to a release water stream, and the second stream can correspond to a cake. The lime slurry can include about 10% lime by total weight, and can comprise lime hydrate, quicklime, or a combination thereof. Dewatering the lime-tailings mixture can include routing the lime-tailings mixture to a centrifuge unit and/or a pressure or vacuum filtration unit.

公开(公告)号：US20220411305A1

公开(公告)日：2022-12-29

申请号：US17861058

申请日：2022-07-08

Applicant: Graymont Western Canada Inc.

Inventor： Nikolas Andrei Romaniuk ,  Michael John Tate ,  Narain Hariharan

IPC: C02F11/145 ,  C02F1/66 ,  C10G1/04 ,  C02F1/52 ,  B09C1/08

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.