Selenium powder Se powder CAS 7782-49-2

Overview of 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 powder Se powder is a gray hexagonal crystal:A = 0.4366nm,C = 0.4954nm,heat of fusion 6.224J/mol;Heat of vaporization 95.48J/mol.2.0 Mohs hardness.The viscosity is 221MPa ·s (220℃) and 70MPa ·s (360℃).Resistivity (0℃) 1.2μΩ·cm.Soluble in dilute lye, potassium cyanide aqueous solution, potassium sulfide solution. It burns in the air with a bright blue flame to form selenium dioxide, giving off a special smell like rancid horseradish. Selenium is directly combined with hydrogen and halogen and is oxidized to selenite by nitric acid and selenite by sulfuric acid. The hot water solution of silver and gold salts was reduced to silver selenide and gold selenide, respectively. Selenium can interact with many metals.

Selenium ash is the only variant with electrical conductivity, and its electrical conductivity increases hundredfold at exposure. The α-type monoclinic and β-type monoclinic are red and dark red crystals, respectively, with densities of 4.46g/cm3, and are easily soluble in CS2 to form a dark red solution. Powder amorphous selenium is a red powder with a density of 4.26g/cm3, slightly soluble in CS2 and converted to ash selenium when heated. The vitreous selenium is an opaque dark red to blue-black sparkling solid, brittle, with a density of 4.28g/cm3 and no definite melting point. It begins to soften at about 50℃.

Selenium reacts with various nonmetals and metals to form selenides. Toxic by inhalation and cumulative hazard.

In industry, selenium powder is mainly obtained from the separation of anode slime in copper or lead electrolysis. The roasting anode slime was treated to get selenium dioxide Se powder and then treated to get selenium. In the method of sulfur dioxide reduction, the concentration of 170g/L selenium dioxide aqueous solution (selenite solution, Se is 130 g/L) was stirred into the sulfur dioxide gas washed by water and dilute sulfuric acid, and the reduction reaction was carried out under full stirring at 75℃. The hexagonal crystalline black fine selenium powder of more than 200 meses could be obtained.

Application of Selenium powder Se powder：

Since the 20th century, the use of Selenium powder Se powder is becoming more and more extensive, especially in semiconductor equipment, photoelectric equipment, selenium solar cells, laser devices, laser and infrared photoconductive materials and so on. Selenium is a typical photosensitive semiconductor material for the development of new technologies in photoelectric applications. It is used for making selenium photocells and selenium rectifiers. In the development of new materials, adding a small amount of selenium can improve the machinability of carbon steels, stainless steels and copper alloys.

1. Selenium powder Se powder Coloring agent and decolorizing agent: selenium powder is a very good coloring agent and decolorizing agent, it makes the glass a purple or light red. The selenium-powder colored glass is very sensitive to the melting conditions, and its coloring stability and amount are greatly affected by its own properties, glass composition and the content of some oxides introduced in the composition, ingredients and water of the compound, melting temperature, liquid level, melting atmosphere and production stability.

2.Selenium powder Se powder Improve the combustion precision of silicon delay powder: some studies have shown that selenium powder can improve the combustion precision of silicon delay powder. Selenium powder in the mixed agent, first at the melting point temperature began to endothermic melting, followed by oxidation, has the effect of deoxygenation. Its combined effects of endothermic, deoxidizing, covering, permeating and filling will change the action conditions in the original agent system.

3. Selenium powder Se powder Used as an analytical reagent, such as a catalyst. It is also used as a dehydrogenating agent for aromatic compounds, for the preparation of selenium organic compounds, the manufacture of electronic and optical instruments, and high purity selenium for the epitaxial diffusion process in semiconductor production.

4. High pure Selenium powder Se powder is used for preparing ZnSe and other compound semiconductors, preparing toner cartridge materials such as electrostatic copying powder and various metal selenides, etc.

5. Selenium powder Se powder can also be used for the preparation of selenium rectifier, photocell, photocell, replication of radio communication, infrared partial photon, electrostatic photocopying powder, photography, metallurgy and other high purity materials.

Selenium powder Se powder Price：

The price of selenium powder Se powder will be based on the production cost, transportation cost,international situation, exchange rate,Factors such as the supply-demand relationship of selenium powder Se powder vary randomly. Tanki New Materials Co., Ltd. aims to provide a full set of customized services to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemical products. If you are looking for selenium powder Se powder, please feel free to send an inquiry to get selenium powder Se powder the latest price.

Selenium powder Se powder Supplier：

As a global selenium powder supplier, Tanki New Materials Co.,Ltd.has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including oxides, carbides, nitrides, single metals, etc.), high-purity targets, functional ceramics, structural devices, and can provide OEM services.