公开(公告)号：US11618697B2

公开(公告)日：2023-04-04

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 ,  C02F1/56 ,  C02F103/10 ,  C02F11/127

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：US11027995B2

公开(公告)日：2021-06-08

申请号：US16184689

申请日：2018-11-08

Applicant: Graymont Western Canada Inc.

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

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

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：US10647606B2

公开(公告)日：2020-05-12

申请号：US15681282

申请日：2017-08-18

Applicant: Graymont Western Canada Inc.

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

IPC: C02F1/52 ,  C02F1/56 ,  C02F1/00 ,  C02F1/38 ,  C02F11/14 ,  C02F11/122 ,  C02F11/127 ,  C02F11/145 ,  C02F11/121 ,  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.