Investigation of press classification process of weak rocks

Publication date: Available online 14 September 2019Source: Materials Today: ProceedingsAuthor(s): P.Ya. Bibikov, A.D. Bardovskiy, A.M. KeropyanAbstractIn metallurgical production weak limestones and dolomites are widely used as flux materials with lump sizes of 25–70 mm in the iron and steel smelting to protect the melt’s surface from oxidation and remove harmful impurities. It was found that a characteristic feature of weak rocks is presence of a large number of so-called ‘hard-to-separate’ grains in the incoming mined rock, the size of which is comparable with the size of sieve openings. As a rule, these grains are either removed to the topsize or are stuck in the sieve openings, significantly reducing the grading process efficiency. The proposed study presents an analysis of the movement nature of a single hard-to-separate grain in reference to a sieve opening of a perforated drum, inside which a shaft with a screw surface is located; the perforated drum and the shaft rotate in opposite directions, grinding and classifying the mined rock at the same time. In this case, a press classification principle is used, which makes it possible to effect a forced impact on the hard-to-separate grains from the working body to pass them through the sieve openings. The embodiment is protected by a patent of the Russian Federation. A theoretical analysis of the nature of different movement types of a single hard-to-separate grain in relation to a sieve opening is carried out a...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research