Arrangement for continuous production of polymer

    公开(公告)号:US11266973B2

    公开(公告)日:2022-03-08

    申请号:US16319493

    申请日:2017-08-08

    申请人: KEMIRA OYJ

    IPC分类号: B01J19/22

    摘要: The invention relates to an arrangement for continuous production of polymer including a polymerisation reactor. The reactor includes a first pulley and a second pulley arranged at a distance from each other, which distance, defining a longitudinal first direction, and a flexible endless belt having a first edge section and a second edge section, which belt, is arranged to travel over the first pulley and the second pulley as a flat belt. The reactor further includes a supporting structure, which is arranged to support the flexible endless belt between the first pulley and the second pulley, whereby the supporting structure is arranged to form the flexible endless belt into a trough section by deviating the first edge section and the second edge section of the flexible endless belt away from the first direction. The trough section has a width-to-height ratio

    Method and treatment system for treating mineral or oil sands tailings

    公开(公告)号:US11111162B2

    公开(公告)日:2021-09-07

    申请号:US16988760

    申请日:2020-08-10

    申请人: KEMIRA OYJ

    摘要: A method for treating tailings substrate from mining or oil sands separation process, the tailings substrate comprising an aqueous phase with suspended solid particulate material. In the method, a flocculating agent is added to the tailings substrate, flocs are allowed to form and the formed flocs are separated from the aqueous phase. The flocculating agent comprises a degraded polyacrylamide comprising at least anionic units and having a process water viscosity reduced by 25-99%, preferably 50-99%, compared to a substantially similar polyacrylamide that has not been degraded by a degradation agent, measured at a shear rate 1 s−1 as a 0.4-0.8 weight-% solution of polymer in process water.