Browsing by Subject "irregular grains"

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Access status: Open Access ,
Analiza porównawcza kruszarek w wielostadialnych układach rozdrabniania skał bazaltowych
(2006) Nowak, Alicja; Gawenda, Tomasz
Basalt rocks are valuable feed to production of broken aggregates for road and building industry. Grain composition and grains shapes, highly influencing on aggregates resistance, determine the aggregates quality. The contents of irregular grains in mineral aggregates depend mainly on material crushing method, i.e. on sort of applied comminuting devices, their construction and movement parameters, comminution level and number of crushing stages. The paper presents conditions and results of multiple stage comminution processes for two selected basalt aggregates production plants. The effects of comminution were investigated for various sorts of crushers. The dependence of grain fractions yields on ratio of grain size »d« and crusher gap size »e« was determined. The comminution levels given by following crushing stages were determined too, as well their correlations with maximum value of d/e. The irregular grains contents in individual grain fractions of produced aggregates and the dependence of crushing products shape coefficients on comminution level were shown. Also, changes of cone crushers capacity dependably on crusher gap size and comminution level, were given.
Access status: Open Access ,
Problematyka doboru maszyn kruszących w instalacjach produkcji kruszyw mineralnych
(Wydawnictwa AGH, 2010) Gawenda, Tomasz
Main issues connected with proper selection of crushing devices in aggregate production circuits were presented in the paper. The first and second section of the article concerns the basics of the comminution processes and the types of crushing devices applied on the European market. The third section treats the principles of crushers' selection on the stage of design and the comminution methodology. It appears that the way of operating the technological process - the number of crushing stages, the control of the material mass flow streams - influences the quality of obtained products. Problems of closed and open comminution circuits were presented in the section four. In summary the examples of technological circuits of aggregates production proposed by the Metso Minerals were shown. The model production of grifts in cone granulator with and without the fines recycle stream was also presented.