The Effects of Moisture Content and Coal Mixtures on the Grinding Behavior of Two Different Coals

Abstract

In this article, effects of moisture content and coal mixtures on grinding properties of the samples of two different fine coals, which were used in the Göltaş Cement Factory in Isparta (Turkey) were investigated. Grinding tests were done in a new grinder called "Mortar Grinder." A good calibration has been established between the Mortar Grinder with the Bond and the Hardgrove grindabilities at the beginning of the tests. At the first stage, A and B type two coal samples, and in the second stage, the samples of three different mixtures (25% of A C 75% of B, 50% of A C 50% of B, and 75% of A C 25% of B) have been worked in grindability tests for different moisture contents. As a result, although the A and B coal samples were showing different grinding intervals versus moisture contents, these samples had similar grinding characteristic curves. Additionally, the high quality coals have easier grinding in respect to the low quality coals with the same moisture content.

Improved Modeling of the Grinding Process through the Combined Use of Matrix and Population Balance Models

“…The notation of the breakage function, the selection function and the identity matrix is shown in Figure 1, where bi, j is the mass fraction of the breakage product of size j that reports to a finer size i [18,19]. Broadbent and Callcott proposed a modified form of the Rosin-Rammler (RR) distribution [20] which can be used to describe the particle size distribution of the comminution products (Equation (2)),…”

“…The notation of the breakage function, the selection function and the identity matrix is shown in Figure 1, where b i,j is the mass fraction of the breakage product of size j that reports to a finer size i [18,19].…”

Μοντελοποίηση Της Σχέσης Ενέργειας-Διαστασιακών Ιδιοτήτων Των Προϊόντων Κατάτμησης Σε Σφαιρόμυλο

“…Η μηχανιστική προσέγγιση η οποία αναπτύχθηκε και βασιζόταν στην αναγνώριση φυσικών συμβάντων κατά τη διάρκεια της κατάτμησης σε μηχανές, βρέθηκε να περιγράφει περισσότερο ικανοποιητικά και ευέλικτα τη διαδικασία αυτή (Gardner and Austin, 1962;Rajamani and Guo, 1992;Bilgili and Scarlett, 2005 (Lynch, 1977). όπου bi,j το κλάσμα μάζας μεγέθους j, το οποίο παρέμεινε στην τάξη μεγέθους i (Lynch, 1977;Austin et al, 1984;Deniz, 2014).…”

Produção de briquetes de carvão vegetal por meio do beneficiamento do bagaço da laranja (Citrus Sinensis)

“…Com relação à granulometria utilizada para a fabricação dos briquetes, algumas literaturas sugerem que se utilizadas partículas finas ou com separação granulométrica (Ellison e Stanmore, 1981;Rubio et al, 1999;Deniz, 2014) Este autor afirma que a distribuição do tamanho das partículas é tão importante quanto o tamanho das mesmas para a produção de um briquete. Para comprovar, Trommer elaborou um índice de distribuição cumulativa que leva em conta a medida de dispersão do tamanho da partícula (m).…”