PURIFICATION AND SEPARATION OF LOOSE MATERIALS IN A PNEUMATIC SYSTEM WITH VERTICAL AIR STREAM

Summary. The paper presents an infl uence of air stream fl ow rates in a modifi ed separator with vertical air stream on purifi cation and separation of selected grain mixture. An analysis of the obtained data on vertical air stream fl ow intensity revealed great variability of grain separation and purifi cation effi ciency. It was found that both air stream intensity and the way and rate of mixture supply into the working area of the separator had the largest infl uence on the course and effi ciency of particular mixture components separation (particularly of light substances). It was observed that precise regulation of air stream fl ow and its wide variability range allowed for an achievement of very good results of purifi cation and separation of the studied grain mixture. The obtained effects resulted in a positive evaluation of the proposed construction of laboratory separator with vertical air stream for effi cient separation of particular components of grain mixture. Key words: contaminated winter wheat grain, pneumatic separator with vertical air stream, purifi cation and separation effi ciency, constructional changes evaluation