Calcium Carbide
Calcium carbide commonly known as Ka stone which response from carbon and calcium, therefore, also known as calcium carbide and molecular formula is cac2, molecular weight is 64.10. Because it was make from carbon and quicklime on electric heat in the generation of 2000 ℃ as to be a not very scientific name - calcium carbide
Origin: Fugu County of Shaanxi Province
1）Quality standard （GB 10665-2004）
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Item |
Index
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high-class products |
first-class products |
qualified products | |
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Gas evolution（20℃、101.3 kPa）/(L/kg) ≥ |
300 |
280 |
260 |
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volume fraction of phosphine in acetylene/ % ≤ |
0.06 |
0.08 | |
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volume fraction of phosphine in acetylene / % ≤ |
0.10 | ||
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mass fraction of size（5mm~80mm）﹡/ % ≥ |
85 | ||
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mass fraction of the left meterial（2.5mm以下）/ % ≤ |
5 | ||
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﹡The size range in parentheses can be determined in consultation between supply and demand. | |||
2）Physical property： New fracture surface of calcium carbide shiny, as a result of exposure to the air to absorb water calcium carbide offten was offwhite, with special stink. Calcium carbide’s color is based on the quality. Generally, it was gray, black, blue, filemot solid, with high calcium carbide was purple, density was 2.22g/cm3 (18 ℃), melting point was 2300 ℃, The calcium carbide in the air can absorb moisture, can be conductive, the higher purity, the stronger electrical conductivity.
3）Chemical property： Chemical properties of calcium carbide very lively and can reaction with much gas, solution at the appropriate temperature
CaC2+H2→Ca+C2H22、In the absence of water, the calcium carbide in the hydrogen flow can heated to 2200 ℃, generating acetylene.
CaC2+N2→CaCN2+C3、Calcium carbide powder with nitrogen reaction lime nitrogen under the condition of heating, the chemical name is calcium cyanamide
CaC2+H2O→Ca（OH）2+C2H24、Calcium carbide decomposition by water can produce acetylene
CaCN. Ammonia pass into the calcium carbide powder and heated to 650 ℃ can generate calcium cyanamide CaCN.
4）Use：
Used in the production of acetylene gas, PVC, lime nitrogen, dicyandiamide, iron and steel desulfurizer, also can use in metal welding and cutting, synthetic resin industry, medicine, rayon, film, and other major raw materials.
5）Packaging,storage and transportation： Calcium carbide packed in dry sealed drum, with a net weight of 100 +2.0 kg per barrel. Calcium carbide stored in dry, well-ventilated storage of dangerous goods. Transport and handling should be light to move and put, people should avoid both ends of the barrel, also storage and transportation should prevent water and fire.
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