![]() ![]() Although it can operate in deeper water than other systems and handles large particles and trash well, it has the disadvantage of being a discontinuous, batch-type system, taking approximately one bite per minute. The clamshell dredge, another mechanical system, is characterized by a large single bucket operating at the end of cables. After the valuable material has been removed by the treatment plant, waste is dumped off the back end of the dredge. The filled buckets, supported by rollers, are pulled up the ladder and dump their load into the hopper. The chain of buckets passes around the upper end of the ladder at a drive sprocket (called the upper tumbler) and loops downward to an idler sprocket (the lower tumbler) at the bottom. The lower end of the ladder rests on the mine face-that is, the bottom of the pond where excavation takes place-and the top end is located near the centre of the dredge, at the feed hopper of the treatment plant. The excavation equipment consists of an endless chain of open buckets that travel around a truss or ladder. It consists of a single hull supporting an excavating and lifting mechanism, beneficiation circuits, and waste-disposal systems. The bucket-ladder, or bucket-line, dredge has been the traditional placer-mining tool, and it is still the most flexible method for dredging under varying conditions. Dredging systems are classified as mechanical or hydraulic, depending on the method of material transport. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!ĭredging is the underwater excavation of a placer deposit by floating equipment.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |