heavy-medium hydrocyclones as a substitute for jigging machines
The use of heavy-medium hydrocyclones for small machine grade concentration as a substitute for hydraulic jigging machines will allow reduction of combustible matter losses with production rejects thereby increasing the yield of concentrate. This replacem
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ional Publishing Switzerland 2016 V. Litvinenko (ed.), XVIII International Coal Preparation Congress, DOI 10.1007/978-3-319-40943-6_127
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Heavy-medium cyclone separation process involves separation density adjustment by alteration of minimum parameters number: initial pulp density, drain sleeve and lower orifice diameters. The other factors affecting the process (coal mixture and pulp pressure at the hydrocyclone inlet, feed solid to liquid ratio, etc.), remain constant [6, 7]. Separation process control could be readily implemented by means of automation facilities. There are two common heavy-medium hydrocyclone types: two-product cyclone where the separation occurs at single density into two finished products, concentrate and rejects; three-product cyclone where the single initial pulp stream is separated at two densities into three finished products, concentrate, middling product and rejects [8, 9]. The small coal concentration in heavy-medium hydrocyclone finds ever-widening applications and offers following advantages: capability of exact density separation of difficult and very difficult coals with the high rock content at the minimum concentration products contamination with the foreign fractions; wide effectively washed coal size range from 0.15-0.2 to 40-50mm, capability of required separation density selection over the range from 1300-1350 to 2000-2200kg/m3 and its adjustment by means of automation facilities; robustness as to variation of load and quantitative composition of concentrated raw material [10, 11]. The hydrocyclone unit implementation is characterized by the cascade equipment layout with gravity streams. Unit operation requires minimum operating personnel. General-purpose heavy-medium hydrocyclones are suitable for concentration of coal, anthracite and shale. These are mainly used for concentration of small coking coal (separation into three products), small power coal and anthracite (separation into two products), small coal and anthracite jig middlings rewashing (separation into three and two products). Heavy-medium hydrocyclones take advantages also at the separation of materials for production of high quality concentrates, for example, anthracitic concentrates for the electrode industry, low-sulphur concentrates, shale concentrate with the increased organic content. In recent years, in the Ukraine the DTEK OOO specialists replace the hydraulic jigging machines with heavy-medium hydrocyclones at the small machine grade concentration stage as a part of improvement of process layouts of the coal preparation plants washing coarse machine grade in the heavy-medium separators [12]. In this regard, the experience is interesting of small machine grade concentration process switchover from the hydraulic jigging machines to heavy-medium hydrocyclones at the Pavlogradskaya CCPP and Oktyabrskaya CCPP. For example, the Pavlogradskaya CCPP adopted heavy-medium hydrocyclones ТГЦ-1070 as a substitute for hydraulic jigging machines ОМ-24 for the small machine grade concentra
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