Production of modern modular semi-mobile washing lines for separation (enrichment) of sand by size classes: 0.05; 0.071; 0.1; 0.16; 0.2; 0.63; 1.0; 2.0 and 5.0 mm. These models of SGU sieve hydrocyclone plants are designed for different capacities: 20 t / h, 40 t / h, 60 t / h and 120 t / h. Each of these installations can be adjusted for individual customer requirements (coal sludge, sand, limestone and granite screening, metallurgical waste, thermal power plant sludge, etc.).A typical model of SSU consists of:- a sump of the circulating pulp, which receives the starting material and water, but often the prepared suspension is supplied;- a classification unit, which consists of a slurry pump that creates the necessary pressure to feed the slurry, a hydrocyclone of the required diameter (which affects productivity) and shape (which affects the separation size), separating the watered target product "sands" and the suspension "drain" containing dusty and clay particles (usually waste of enrichment), as well as pipelines and shut-off equipment;- dehydrating high-frequency screen GVCh with special sieves (polyurethane, rubber urethane or stainless steel sieves), which brings the final product to the required moisture class.This set of equipment is enclosed in a common semi-mobile frame and is equipped with ladders and walkways for quality control and maintenance.The sieve hydrocyclone unit operates on a partially closed cyclic principle. Its basis is a reservoir, which receives the initial mixture of sand, clay inclusions and water, in which the slurry level is kept within a certain range. In fact, the reservoir is needed to provide a certain concentration of the mixture that the centrifugal pump is able to lift into the hydrocyclone. In a hydrocyclone (or in double hydrocyclones), due to centrifugal forces, almost 100% of particles larger than 100 microns and 50-80% of particles larger than 40-80 microns are classified, which in the form of a highly concentrated mixture are discharged from the cyclone onto a dehydration (dehydration) screen located under the hydrocyclone. Smaller particles (which should contain all clay particles and other inclusions) are carried away with the main volume of water from the hydrocyclone into a system that divides the flow (automatic regulation by a valve) into a return to the tank and a drain, which is sent to the water purification system. The dewatering screen is equipped with polyurethane or rubber modular screens with openings (usually 0.3-1.5 mm), through which water efficiently drains into the tank, and sand particles slide to the discharge chute and are discharged onto the product conveyor. The content of dust particles in the sand will decrease to 0.02-0.9%.We strongly recommend that before choosing sorting or classifying equipment that is planned to solve your problem, it is imperative to carry out the necessary research of raw materials in our laboratory.