Abstract: The output of mixing devices of the type described in U.S. Pat. No. 4,057,223 may be substantially improved by attaching to the outlet of such mixing devices a vertical line containing flow control means, eductor means, and a long leg which communicates with a discharge line for feeding dilute water-soluble polymer solution. The discharge line is perpendicular to the leg and is fitted with a second flow control means.While the invention is useful for increasing the efficiency of the devices of the type described in U.S. Pat. No. 4,057,223, it may be adapted to improving other mixing devices.

Abstract: Apparatus and method for determining the settling rate of solids or particulate bearing liquids in a continuous process or flowing stream in which a sample of the material is periodically selected and placed in a chamber which is transparent or has a transparent portion through which a light beam can pass such that a detector detects the amount of light passing through the chamber and the material and wherein the light transmissivity at various times is recorded and used to calculate the partial settling rate, the full settling rate and the percentage of solids or parts per million in the sample.

Abstract: A technique for controlling the amount of dissolved material in a slurry liquid stream containing dispersed particulate solids which is being continuously processed in a zone of countercurrent particulate solids separation and washing. Flow rates and conductivity measurements are made on streams entering such zone which are then used to estimate the amount of dissolved material in a starting slurry liquid. Preferably, conductivity measurements are made with electrodeless conductivity measuring probes. The technique is well adapted for use in a brown stock washing system employing a plurality of counterflow washers. The technique can be used for measurement of the quantity of gas in an agitated process stream in such a zone.

Abstract: A device for mixing viscous fluids with water comprising a rectangular block containing a pre-mixing chamber, a center section fitted with a bevelled double acting valve capable of restricting fluid flow in two distinct directions, an outlet chamber and recycling means for thoroughly mixing the viscous fluids with the water. The mixing device is able to balance both low and high back pressures, eliminate cavitation and deliver a mixture of viscous fluid and water without serious degradation of the components of the viscous fluids.

Abstract: A multiplex circuit for use with a plurality of measuring devices, each of which require a period of stabilization before providing an accurate measurement, includes a plurality of measuring stages. Each stage is connected in cascade to an adjacent stage and includes a measuring device, readout means and a timing circuit which activates the readout means a predetermined interval after the measuring device is turned on.