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Granulometrijski sastav polaznog uzorka klase krupnoće -3,35 mm - faktor pouzdanosti Bond-ovog radnog indeksa meljivosti
Grain-size distribution of starting sample of size class -3.35 mm: Reliability factor of the Bond work index of grindability
Projekat: Implementacija savremenijih tehničko-tehnoloških i ekoloških rešenja u postojećim proizvodnim sistemima Rudnika Bakra Bor i Rudnika Bakra Majdanpek (MPNTR - 33007)
Usavršavanje tehnologija eksploatacije i prerade rude bakra sa monitoringom životne i radne sredine u RTB Bor grupa (MPNTR - 33038)
Sažetak
Istraživanja Bond-ovog radnog indeksa meljivosti na siromašnoj i bogatoj rudi bakra RB Bor dala su dva, za teoriju i praksu procesa mlevenja, značajna rezultata. Jedan potvrđuje prethodna teorijska i praktična iskustva na ovim sirovinama, a to je, nešto veća otpornost usitnjavanja siromašne u odnosu na bogatu rudu bakra Wi s = 14,11 kWh/t, odnosno Wi bs = 13,35 kWh/t. Drugi rezultat ukazuje na uticaj granulometrijskog sastava polaznog uzorka za određivanje Bond-ovog radnog indeksa klase krupnoće -3,35 mm, na vrednost ovog pokazatelja, Wi b = 16,28 kWh/t tj. Wi bs = 13,35 kWh/t. Mala razlika u otpornosti prema usitnjavanju ispitivanih ruda bakra daje mogućnost zajedničke prerade ovih sirovina. Konstatovani uticaj granulometrijskog sastava polaznog uzorka na vrednost Bond-ovog radnog indeksa, pored teorijskog ima i veliki praktičan značaj pri projektovanju i izboru procesne opreme u procesu mlevenja. Istraživanja kinetike mlevenja siromašne i bogate rude bakra, kao i različita vremena potrebna za dobijanje proizvoda mlevenja određene finoće potvrđuju prethodnu konstataciju.
Abstract
The investigation of the Bond' work index of grindability of low-grade and high-grade copper ore from the Copper Mine Bor has given two, for the theory and practice of comminution processes, significant results. The first confirms the previous theoretical and practical experiences on these raw materials, which is slightly higher fragmentation resistance of low-grade copper ore, compared to high-grade copper ore Wi p=14.11 kWh/t and Wi rs=13.35 kWh/t, respectively. The second result indicates the effect of grain-size distribution of starting sample, size class -3.35 mm, for determination the Bond' work index -3.35 mm size class, on the values of Bond work index, Wi r=14.11 kWh/t and Wi rs=13.35 kWh/t. The slight difference in resistance to fragmentation of tested copper ore samples gave the possibility of common processing of these raw materials. The stated effect of grain-size distribution of starting sample on the value of Bond work index, has a theoretical as well as a practical significance in designing and selection of process equipment in the grinding process. The grinding kinetics of low-grade and highgrade copper ore, as well as different times, required to obtain the grinding products of certain fineness confirm the previous statement.
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