Ground sulfur

A dichromate or chromate solution is reduced under pressure to produce a hydrous oxide, which is filtered, washed, and calcined at 1000°C. The calcined oxide is washed to remove sodium chromate, dried, and ground. Sulfur, glucose, sulfite, and reducing gases may be used as reducing agent, and temperatures may reach 210°C and pressures 4—5 MPa (600—700 psi). 

Compound 1 (0.71 g, 0.005 mol) was mixed with 2.1 g of finely ground sulfuric acid adsorbed on silica gel. The reaction mixture was exposed to microwave irradiation for 5 min. After the completion of the reaction (monitored by TLC using CHCl3-MeOH, 95 5) the crude product was extracted by MeOH, treated with ac-... 

Sulfur is found in large quantities but in various forms throughout the world. It is found in metal ores such as copper pyrites or chalcopyrite (CuFeS2) and zinc blende (ZnS) and in volcanic regions of the world. Natural gas and oil contain sulfur and its compounds, but the majority of this sulfur is removed as it would cause environmental problems. Sulfur obtained from these sources is known as recovered sulfur and it is an important source of the element. It is also found as elemental sulfur in sulfur beds in Poland, Russia and the US (Louisiana). These sulfur beds are typically 200 m below the ground. Sulfur from these beds is extracted using the Frasch process, named after its inventor Hermann Frasch. 

The mixture is loaded out of the reactor into tank 16 to distil tetraethyllead. The tank should already be filled with ground sulfure and ferric iron chloride. Iron chloride reduces the alkalinity of the dross and improves its consistency due to the formation of the colloid solution of iron hydroxide ground sulfure is uniformly distributed through the dross, also improving its consistency and preventing clotting of lead particles. 

There are three formulations of sulfur used predominantly today. The first is finely ground sulfur mixed with 1 to 5 percent talc or clay to assist in the dusting effectiveness. The sulfur in this form may be used as a carrier for additional pesticides. The second form is colloidal sulfur that is so fine that it must be formulated as a paste to enable it to be mixed with water. The third form is wettable sulfur. In this formulation the sulfur is finely ground with a wetting agent so that it will mix readily with water for spraying. 

Sulfur is one of the oldest pesticides known. It has been used for centuries to control both plant pathogens and pests like insects and mites on contact. Sulfur is mined from natural deposits as a yellow solid that is almost insoluble in water. Wettable sulfur is finely ground sulfur mixed with a wetting agent to help it go into solution. Sulfur is also formulated as a... 

Phosphate rock, crude (ground or not ground) Sulfur (brimstone)... 

A mixture of 24.6 g. of moist, freshly precipitated ASgSs and 6.4 g. of finely ground sulfur is prepared and a solution of 24 g. of NaOH in 200 ml. of water added. This new mixture is allowed to stand for 12 hours, with frequent agitation, until the bulk of the sulfur has dissolved. It is then filtered, and the filtrate is evaporated until crystallization, at which point it is allowed to cool. The crystallized substance consists of very pure NagAsOgSg 11 HgO. Additional product is obtained from the mother liquor it is, however, contaminated with thio- and monothioarsenates. 

Cross-linking agents Only ground sulfur, still in frequent use, is comparatively harmless. Most of the sulfur donors and organic peroxides used must be viewed critically as potentially harmful to skin and eye mucosa. 

A mixture of N,N-didiloro-l-cyano-l-methylpropylamine, finely ground sulfur, and CCI4 containing a catalytic amount of iodine heated a few min. at 100-105° until an exothermic reaction starts after a few min., and heating at 100° resumed when the vigorous reaction has ceased until all the sulfur has dissolved after ca. 0.5 hr. (l-cyano-l-methylpropyl)imidosulfurous dichloride. Y 76%. F. e. s. L. N. Markovskii and E. S. Levchenko, 2K. 59, 2786 (1969) C. A. 72, 89723. 

Precaution Oxidizer explosive reaction with warm K or Na violent reaction with N compds., ground sulfur, powd. Al, etc. can react vigorously with reducing materials Hazardous Decomp. Prods. Heated to decomp., emits toxic fumes of Pb Uses Catalyst, curing agent for polysulfide,... 

ASTM D4528 classifies different grades of ground sulfur for use in rubber. 

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