SYSTEM FOR HANDLING THE UNDERFLOW FROM A PRIMARY SEPARATION VESSEL IN THE TAR SAND HOT WATER PROCESS

摘要

"SYSTEM FOR HANDLING THE UNDERFLOW FROM A PRIMARY SEPARATION VESSEL IN THE TAR SAND HOT WATER PROCESS" For operating control and safety, a closecoupled pump is direct connected to the underflow of the primary separation vessel (PSV). The desired discharge density of the PSV is 70 - 80% solids in order to minimize bitumen losses. For a good pumping system, the pump discharge density should be less than 65% solids to avoid settling out of the solids in the downstream conduit. Therefore it is necessary to dilute the PSV underflow before it reaches the pump. Secondary flotation tailings, a dilute stream containing a high proportion of fine solids, is used for this purpose. The solids content of the PSV underflow is monitored by one of two alternative systems - a torque recorder on the PSV rake shaft or a density gauge on the PSV underflow conduit. The former is used when the PSV is being fed low fines tar sand the latter when it is treating high fines tar sand. The density of the stream at the pump discharge is monitored to control the amount of secondary flotation tailings added. By the use of the controlled-speed, close-coupled pump, a closed system for controlling underflow density is provided. By using secondary tailings as the diluent, water requirements for the process are reduced and a pumpable mixture is provided from which the solids do not readily settle out.