Comprising a pyrite pyrite, marcasite and pyrrhotite. Sulfur is one of the most widely distributed elements in the earth's crust, mostly in the form of sulfides. Natural sulfur is also distributed, but it is rare in pure quality, and it is often mixed with mud and organic matter. Among the sulfide minerals, pyrite FeS 2 , pyrite FeS 2 , pyrrhotite Fe n S n +1 and the like are common. Both pyrite and pyrite have different crystals and are homomorphic, with sulfur content as high as 53.4%. Pyrrhotite contains 39%-40% sulfur. The natural stream is sometimes mixed with selenium , tellurium and arsenic , among which selenium and arsenic are harmful impurities. Pyrite is often symbiotic with copper , lead , zinc and other sulfide deposits, containing a small amount of gold , silver , cobalt , nickel , platinum , selenium and tellurium. Associated fluorine and arsenic are harmful impurities. Sulfur and pyrite are widely used to produce sulfur and sulfuric acid. It is a raw material for the paper industry. It can be used as a hardener in the rubber industry. It can be used as a herbicide and insecticide in pesticides. Other applications such as man-made fibers and medicines are also widely used. Industrial requirements for sulfur: cut-off grade ≥ 8%, industrial grade ≥ 12%, harmful components Pb + Zb ≤ 1%, F should be ≤ 0.03% - 0.05%, As should be ≤ 0.5%, because these elements have influences. Pyrite analysis projects, in addition to sulfur, sometimes need to measure harmful impurities such as arsenic, fluorine, etc., should also pay attention to comprehensive analysis of elements that can be comprehensively utilized. The processing of pyrite samples requires only 100 mesh. The sample should be dried at 60° to reduce oxidation of the sample. Natural sulfur samples cannot be machined. Bungee Cord Assortment set secures your items quickly and easily. Providing up to 40 in. in length, this set is perfect for securing items indoors or outdoors. Durable construction provides weather resistance for long-lasting use. Get the security you need with reliable strength you can trust. Assorted pack includes 24 pieces and includes a handy reusable, resealable jar for easy storage. Bungee Cord,Bungee Cord Set,Rubber Elastic Bungee Cords,Heavy Duty Tents Bungee Cord WINNERLIFTING SAFETY EQUIPMENT CO., LTD. , https://www.cargostrapfactory.com