Hindered Bed Separator with Cross Flow - 10724 Words

Chapter 1 In-Plant Testing of CrossFlow Separator in Coal Industry 1.1 Introduction 1.1.1 General The mineral processing industry has commonly utilized hydraulic separators throughout history for classification and gravity concentration of various minerals. More commonly referred to as hindered-bed or fluidized-bed separators, these units make use of differential particle settling rates to segregate particles according to shape, size, and/or density. Conventional hindered-bed separators are inherently inefficient due to wide variations in the solids content and size distribution of the feed, which have an adverse effect of plant performance and operating costs. The traditional design consists of an open top vessel into which†¦show more content†¦The throughput capacity of existing hydraulic separators is limited by this introduction of water through the feed distribution pipe in the separation chamber and the excessive elutriation water added to the system. As previously mentioned, part of this problem was alleviated through the tangential feed distribution designed for the CrossFlow separator. A redesign of the elutriation water distribution, through use of a slotted plate at the base of the separation chamber, has minimized the amount of water used by allowing the water to better disperse through the separator. Larger diameter holes spread farther apart (6 inches versus 0.5 inches) allows for the water to be introd uced into the chamber, and the baffle plate disperses the water throughout the chamber. This ultimately reduces the amount of overall elutriation water required, and increasing the throughput capacity of the separator. The improved distribution of elutriation water also minimizes dead zones within the separation chamber that were often caused by plugging of the small diameter holes in the lateral pipes at the bottom of the separation chamber. By increasing the diameter of the holes and adding the baffle plate to fully distribute the water, separation efficiency has increased due to full utilization of the separation chamber. The increase in separation efficiency and throughput capacity reduces the operatingShow MoreRelatedAn Impact Assessment of Science and Technology Policy on National Development of Nigeria61708 Words   |  247 Pagesnational objectives of ST-driven rapid industrialization geared towards increasing national productive output and developing a dynamic and self-reliant economy. Also, efforts shall be made to unravel why the following ineffective mechanisms hindered the national ST objectives: ï‚ · dearth of people-oriented, market–driven, job-creating dynamic ST policies to guide national development efforts; ï‚ · minimum investment in the training of skilled human resources to sustain scientific creativity