Companhia Brasileira de Alumínio (CBA) has bauxite processing plants at Poços de Caldas and Itamarati de Minas, and a new processing plant at Miraí that has been operating since June, 2008; all of them are in the State of Minas Gerais. The plants haveunits for the crushing, scrubbing and screening operations. The screened oversize is the concentrate or washed bauxite. At Itamarati de Minas, the...

R.L Reynolds' , M . Reheis, J. Yount, P. Lamothe US Geologicol Survey. MS 980, P.O. Box 15046, Den~er. CO 80215, USA Received 14 January 2005; received in revised form 17 May 2005; a~~epted 1 June 200S Available online 20 December 2005 The recognition and characterization of aeolian dust in soi l contribute 10 a better understanding of landscape and ecosystem dynamics or dryJands. Results of th...

The importance of recycling and utilization of recycled fiber has recently been recognized because of concerns about environmental issues and economic aspects. In spite of several advantages offered by paper recycling such as wood savings through substitution of virgin pulp and reduction in chemical usage, recycled pulp also contains plenty of fines having high relative surface area and hig...

Article history: Received 14 March 2016 Received in revised form 7 August 2016 Accepted 8 August 2016 Available online 16 August 2016 After recognition that debris flows co-occur with human activities, the next step in a hazards analysis involves estimating debris-flowprobability. Prior research published in this journal in 2010 used varnishmicrolamination (VML) dating to determine a minimum oc...

estimate the proportion of fines generated during the blasting process. The proposed framework is based on the combination of two Rosin-Rammler based distribution functions to model the full range of fragments expected to be produced during this process. This particular approach, which has been successfully applied for a number of years by the Julius Kruttschnitt Mineral Research Centre (JKMRC)...

An apparatus is designed and fabricated for conducting experiments concerning fluidized segregation to verify a proposed design concept for a more efficient comminution machine. Previous studies have found that the fines distribute the intended crushing load imposed by the machine on the particle bed; thus, the load that must be applied to crush the larger particles increases. By removing the f...

We investigated the effects of CO2 enrichment on fine root chemical composition of two tree species common to northern hardwood forests. Two-year-old Betula papyrifera and 3-year-old Acer saccharum saplings were grown under ambient (400 μmol·mol–1) and elevated (700 μmol·mol–1) CO2 in a glasshouse experiment. In both species, root/shoot ratios and fine root percentages (of total biomass) were u...