Along with the pit, the whole physics package was also informally nicknamed "Christy Gadget". The solid-cores were known as the " Christy" design, after Robert Christy who made the solid pit design a reality after it was initially proposed by Edward Teller. The internal neutron initiators were later phased out and replaced with pulsed neutron sources, and with boosted fission weapons. Later designs used TOM initiators of similar design but with diameters of only about 1 cm ( 3⁄ 8 in). A hollow pit was considered and known to be more efficient but ultimately rejected due to higher requirements for implosion accuracy. ![]() The Fat Man pit, and those of subsequent models, were all plated with nickel. The Gadget's pit was electroplated with 0.13 mm of silver the layer, however, developed blistering and the blisters had to be ground and plated with gold leaf before the test. The Gadget and Fat Man used pits made of 6.2 kg of solid hot pressed plutonium-gallium alloy (at 400 ☌ and 200 MPa in steel dies – 750 ☏ and 29,000 psi) half-spheres of 9.2 cm (3.6 in) diameter, with a 2.5 cm (1 in) internal cavity for the initiator. The pits of the first nuclear weapons were solid, with an urchin neutron initiator in their center. The information at this website might include opinions or views which, unless expressly stated otherwise, are not necessarily those of the 911METALLURGIST.COM or 911METALLURGY CORP or any associated company or any person in relation to whom they would have any liability or responsibility.Pit designs Christy pits Visitors to the 911METALLURGIST.COM website should not act upon the website’s content or information without first seeking appropriate professional advice.ĩ11METALLURGY CORP accepts no responsibility for and excludes all liability in connection with browsing this website, use of information or downloading any materials from it, including but not limited to any liability for errors, inaccuracies, omissions, or misleading statements. The 911METALLURGIST.COM and 911METALLURGY CORP tries to provide content that is true and accurate as of the date of writing however, we give no assurance or warranty regarding the accuracy, timeliness, or applicability of any of the contents. Sonic sampling is probably the most efficient answer to the challenge of investigating a few millions of tons of old tailings. It (process all) is still the best for small deposits.ĭISCLAIMER: Material presented on the 911METALLURGIST.COM FORUMS is intended for information purposes only and does not constitute advice. ![]() Collecting cores, as preserved as possible, is preferable to other approaches, as vertical variations can be sharp, reflecting past mining or processing decisions. Sampling tailings with carefully placed drill holes from deposit surface is therefore best. ![]() On the opposite, the horizontal variations are much less important, apart from water gradient, and sometimes a bit of grain size or density sorting through sedimentation or hydrocycloning. Other variations may be observed with depth. We should talk of tailings stratigraphy here. ![]() Since a few decades, pyrite is dumped in tailings, changing radically their composition (and AMD behavior). For instance, early Pb-Zn tailings are generally pyrite-poor as pyrite was valorized for sulphur. Tailings are variable by essence with mining and processing. Laboratory Testing & General Mineral Processing Engineering
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |