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Calcium silicide is generally not hazardous to water, and do not discharge the material into the surrounding environment without government permission.

Calcium silicide is generally not hazardous to water, and do not discharge the material into the surrounding environment without government permission.

storage method Seal in a cool dry place.

2022/05/31

Silicon (called silicon in Taiwan and Hong Kong) is a chemical element, its chemical symbol is Si, formerly known as silicon.

Silicon (called silicon in Taiwan and Hong Kong) is a chemical element, its chemical symbol is Si, formerly known as silicon. The atomic number is 14, the relative atomic mass is 28.09, there are two kinds of allotropes, amorphous and crystalline, and allotropes include amorphous silicon and crystalline silicon. A metalloid element belonging to group IVA on the periodic table.

2022/05/31

Silicon (called silicon in Taiwan and Hong Kong) is a chemical element, its chemical symbol is Si, formerly known as silicon. The atomic number is 14, the relative atomic mass is 28.09, there are two kinds of allotropes, amorphous and crystalline, and allotropes include amorphous silicon and crystalline silicon. A metalloid element belonging to group IVA on the periodic table. Crystalline silicon is steel gray, amorphous silicon is black, density is 2.4g/cm3, melting point is 1420℃, boiling point is 2355℃, crystalline silicon belongs to atomic crystal, hard and shiny, and has semiconductor properties. The chemical properties of silicon are relatively active. It can combine with oxygen and other elements at high temperatures. It is insoluble in water, nitric acid and hydrochloric acid, but soluble in hydrofluoric acid and lye. It is used to make alloys such as ferrosilicon, silicon steel, etc., single crystal. Silicon is an important semiconductor material used to make high-power transistors, rectifiers, solar cells, and more. Silicon is widely distributed in nature, containing about 27.6% in the earth's crust, mainly in the form of silicon dioxide and silicate. Crystalline silicon is dark blue, very brittle, and is a typical semiconductor. Chemical properties are very stable. At room temperature, it is difficult to react with other substances except hydrogen fluoride.

2022/05/31

Physical data of calcium silicide

Physical data of calcium silicide

2022/05/31

Synthetic method of calcium silicide

1. Calcium silicide with higher purity can be obtained by direct melting of elemental silicon and calcium. But the operation has to be done in two steps. The first step: Mix the pure calcium chips and pure silicon powder evenly, put them in a hard biscuit-fired porcelain boat, quickly put the porcelain boat into the quartz reaction tube, pass CO2 into the tube, the porcelain boat has been heated to 1000 ℃, In just a few seconds, the mixture melts and the reaction proceeds violently. The porcelain boat was taken out, the product CaSi coagulated immediately, and it was pulverized. CaSi is a porous block, lead-grey and metallic luster. Step 2: Mix the CaSi with the calculated amount of Si powder evenly, place it in a nickel boat, and heat it to 1000°C in a H2 flow. Heating was required for 15h because the last stage of the reaction proceeded slowly. 2. Mix pure CaO and silicon with appropriate fluxes CaF2 and CaCl2, and melt at 1400 °C to obtain CaSi2. The CaSi2 thus obtained is mixed with a large amount of silicon.

2022/05/31

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