Selenium powder Se powder CAS 7782-49-2

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About Selenium powder Se powder:
Selenium powder, chemical formula Se, black gray nonmetal, soluble in concentrated sulfuric acid, chloroform, slightly soluble in carbon disulfide, toxic, insoluble in water, ethanol. Selenium powder is usually in the form of powder or granule, with pure appearance, consistent color, purity up to 99.99%, no soil and other impurities, stable composition and even moisture.
Selenium is a chemical element with the symbol Se and an atomic number of 34. It is a nonmetal (much less thought of as a nonmetal), somewhere between sulfur and tellurium on the periodic table, and also similar to arsenic. Selenium is found in metallic sulfide ores, where it partially displaces sulfur. Commercially, selenium is a by-product of the refining process of these ores, usually during the production process. Pure selenium or selenate compounds are known but are rare. Today the main commercial uses for selenium are glassmaking and pigments. Selenium is a semiconductor used in photovoltaic cells. The once important applications of electronic products have been largely replaced by silicon semiconductor devices. Selenium is still used in several types of DC power surge protectors and one type of fluorescent quantum dot. Tungstenmolybdenummetals is a trusted global Selenium powder Se powder supplierFeel free to send an inquiry about the latest price of Selenium powder at any time.
Although trace amounts of selenium are necessary for cellular function in many animals (including humans), the elements of selenium and (especially) selenium salts are toxic in even small doses, leading to selenium poisoning. Selenium is an ingredient in many multivitamins and other dietary supplements, as well as infant formula, and is a component of the antioxidant enzymes glutathione peroxidase and thioredoxin reductase (which indirectly reduce certain oxidizing molecules in animals and some plants) and three diiodide enzymes. 

Features of selenium Se powder CAS 7782-49-2: 
Amorphous red powder, becoming black on standing and crystalline on heating; vitreous and colloidal forms may be prepared. Amorphous form softens at 40 °C and melts at 217 °C. It rarely occurs in its elemental state in nature, or as pure ore compounds. Soluble in concentrated nitric acid and in (liquid form) common alkalies. Forms binary alloys with silver, copper, zinc, lead, etc. Low toxicity. A necessary nutritional factor for animals.

How is Selenium powder Se powder Produced?
Selenium is a kind of sparse element, and there is no independent selenium production plant in the world. Selenium is associated with electrolytic copper and nickel, which exists in anode mud of electrolytic anode. There are many methods to recover and purify selenium and tellurium from copper electrolytic anode mud, such as caustic oxidation pressure leaching, oxidation roasting high-temperature leaching, low-temperature oxidation roasting, dilute sulfuric acid leaching, etc. Selenium and tellurium are reduced mostly by sulfur dioxide reduction and copper reduction. Due to the method of pre-roasting and oxidation, the maintenance cost of complex power equipment is high, the sulfur dioxide gas is harmful to the human body and the environment, and the recovery and purity of selenium and tellurium are high. With H2O2 as oxidant, selenium and tellurium were oxidized in a weakly acidic solution. After solid-liquid separation, selenium and tellurium were separated by adjusting pH, and selenium and tellurium were reduced by Na2SO3 under hydrochloric acid acidification. The recoveries of selenium and tellurium were 99% and 98%, respectively, and the purity of both of them could reach 99%.

Applications of Selenium powder Se powder:
Selenium can be used in different fields, depending on its purity. Selenium is now used in a wide variety of applications, from glass and metallurgy to pigments, agriculture and electronics. Selenium powder is mainly used in the production of selenium dioxide as electrolytic manganese melting catalyst, other applications in rectifier, photographic exposure agent, petroleum working catalyst, copy toner cartridge, selenium photosensitive plate, alloy, feed and pigment in plastics, paint, enamel and glass, medical and health care medicine and other industries.

Storage Condition of selenium Se powder:
The damp reunion will affect Se powder dispersion performance and using effects, therefore, selenium Se powder should be sealed in vacuum packing and stored in cool and dry room, the selenium Se powder can not be exposure to air. In addition, the Se powder should be avoided under stress.
Selenium powder Se powder CAS 7782-49-2插图

Selenium Powder Properties

Other NamesSelenium particles, Selenium microparticles, Selenium micropowder,
Selenium micro powder, Selenium micron powder,
Selenium submicron powder, Selenium sub-micron powder
CAS No.7782-49-2
Compound FormulaSe
Molecular Weight78.96
AppearanceGray to Black Powder
Melting Point217
Boiling Point684.9
Density4.79 g/cm3
Solubility in H2ON/A
Electrical Resistivity106 microhm-cm @ 0 °C
Poisson’s Ratio0.33
Tensile StrengthN/A
Thermal Conductivity0.00519 W/cm/K @ 298.2 K
Thermal Expansion(25 °C) 37 µm·m-1·K-1
Vickers HardnessN/A
Young’s Modulus10 Gpa

Selenium Powder Health & Safety Information

Signal WordDanger
Hazard StatementsH301+H331-H373-
Hazard CodesT
Risk Codes23/25-33-53
Safety Statements20/21-28-45-61
Transport InformationUN3288
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