ANALYSIS OF DEGREE OF EXTRACTION OF SOLID-PHASE PARTICLES DURING SEPARATION OF NON-NEWTONIAN SUSPENSIONS IN A CYLINDRICAL DIRECT-FLOW HYDROCYCLONE WITH FORCED FLOTATION

摘要

Use of hydrocyclones in different production processes for the separation of heterogeneous systems makes it possible to lower energy outlays significantly, and reduce the net cost and increase the quality of production. In various branches of industry, separable suspensions are, in many case, non-Newtonian media, the effective viscosity of which decreases with increasing strain rate. These suspensions are separated during the production of protein-vitamin concentrates (paprin, gaprin, meprin), biomass suspensions, glazes, and SiC_3, as well as in equipment used to clean waste water of oil, fats, and other substances. The lack of an adequate model for the separation of non-Newtonian suspensions in a hydrocyclone has, until now, been the primary obstacle when creating a general procedure for analysis of these vessels. It is known that the hydraulic resistance in cylindrical direct-flow hydrocyclones is appreciably lower than that in cylindrical-conical vessels; use of direct-flow cylindrical hydrocyclones, which discharge separation products through a lower drain is therefore expedient for the separation of non-Newtonian suspensions having significant effective viscosity; this makes it possible to avoid large pressure differentials in the vessel.