Monthly Archives - January 2019

30 Jan

Preparation of rare earth metals

The production of rare earth metals is also called the production of rare earth pyrometallurgy. Rare earth metals are generally divided into mixed rare earth metals and single rare earth metals. The composition of mixed rare earth metals is similar to that of the original rare earth elements in ores. Using rare earth oxides (except oxides of samarium, europium, ytterbium and thulium) as raw materials, it is difficult to reduce to a single metal by general metallurgical methods because [...]

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26 Jan

The main types of solar cells

1. Monocrystalline silicon: the solar cell with the highest photoelectric conversion rate has been commercialized at present, and the highest conversion rate can reach 25%. The disadvantage is that it is relatively expensive and requires high purity of silicon. 2. Polysilicon: the price is cheaper than monocrystalline silicon, but the photoelectric conversion rate is lower. 3. Cadmium telluride (CdTe)/gallium arsenide (GaAs) : cadmium telluride and gallium arsenide (GaAs) are ideal materials for solar cells because their bandwidths basically match the solar [...]

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22 Jan

Present situation and development direction of strontium industry in China

Keywords: strontium, strontium chloride, strontium carbonate With magnesium, calcium, barium strontium Ⅱ for A family of elements, is A kind of soft silvery white metal, 2.6 g/cm3 density, melting point 769 ℃, boiling point 1384 ℃, + 2 valence. Strontium is a reactive chemical that burns red when heated to the melting point in air and is readily reacted with water and acids to give off hydrogen. Strontium and its compounds have been widely used since 1808, when the British chemist [...]

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15 Jan

The structure of pigment and dispersant and the function of dispersant

1, the introduction Coating is widely used in our daily life, and plays a protective, decorative and special role in the painted parts. The coating is mainly composed of film-forming substances (resin), fillers, additives and solvents (or water). With the development of industry and the improvement of living standards, pigments are more and more used in the paint and ink industry to give a better appearance. Unlike dyes, pigments are generally insoluble in the medium used and, in most cases, [...]

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10 Jan

Method for the preparation of strontium titanate

Research progress of preparation methods of strontium titanate at present, the main preparation methods of strontium titanate are sol thermal method. Sol-sol-whether in metallic materials, or in organic and inorganic non-metallic materials, adding appropriate amount of strontium and its compounds can change some of its properties and even make it have special functions, so it has the name of metal monosodium glutamate. Strontium titanate (SrT iO 3) is one of the important strontium compounds. Strontium titanate has the advantages [...]

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04 Jan

Decomposition of rare earth concentrate

Rare earth concentrate in the rare earth, generally insoluble in water carbonate, fluoride, phosphate, oxide or silicate and other forms. Must be through a variety of chemical change to rare earth into soluble in water or inorganic acid compounds, after dissolving, separation, purification, concentration and calcination process, made all kinds of mixed rare earth compounds such as mixed rare earth chloride, as a product or separation of single rare earth materials, such a process known as decomposition, also known [...]

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