In this research, the efficiency of the comminution circuit as well as the efficiency of size classification equipment of the concentrator plant 2 of Sarcheshmeh copper complex was studied. The comminution circuit of this plant includes one SAG mill in a closed circuit with a vibrating screen and one ball mill with a size classification system of hydrocyclone. The goal of this work was to calcu...

Abstract Generally, development in the pulp and paper industry requires extensive cutting of trees, which effect contributes to deforestation. The dramatic growth demand for wood supply, combined with increasingly increasing cost timber, has created a surge interest use non-wood plant fibres production widely developed countries. waste material pulping paper-based industries could be beneficial...

The present study was aimed to isolate, identify and screening of enzyme producing bacteria from soil samples. For this purpose the soil samples were collected from agriculture fields at sangam dairy, Guntur district, fish culture ponds, timber depot soil at rural areas of Bhimavaram, West Godavari district and oil mills at Vijayawada, Krishna district, Andhra Pradesh. A total of seventeen stra...

We consider a two-echelon timber supply chain in which the first echelon consists of several stands to be harvested and the second echelon consists of mills to be procured with logs of different length. This problem aims at minimizing harvesting and transportation costs for one production period, while satisfying demand expressed as mix of volumes of specific log types. Harvesting cost, which i...

Timber transportation is an essential and often unprofitable segment of the wood supply chain. This study evaluated profitability individual timber deliveries for log truck owners in US South. Origin destination data were collected from 909 257 harvest sites. Travel time distance estimated using ArcGIS GPS tracking. Monte Carlo Simulation was used to calculate 1000 unique combinations payload, ...

In the cutting stock pattern minimisation problem, we wish to satisfy demand for various customer reels by cutting as few as possible jumbo reels, and further to minimise the number of distinct cutting patterns used. We focus on the special case in which any two customer reels t into a jumbo, but no three do: this case is of interest partly because it is the simplest case that is not trivial, a...