[Calcium carbide of different crystal formation synthesized by calcium carbide residue].
To recycle calcium carbide residue effectively, calcium carbide of different crystal form, including global aragonite, calcite and acicular calcium carbide was synthesized. Both the influence of pretreatment in the purity of calcium carbide, and the influence of temperatures of carbonization reaction, release velocity of carbon dioxide in the apparition of calcium carbide of different crystal form were studied with DTA-TG and SEM. The result shows that calcium carbide residue can take place chemistry reaction with ammonia chlorinate straight. Under the condition that pH was above 7, the purity of calcium carbide was above 97%, and the whiteness was above 98. Once provided the different temperatures of carbonization reaction and the proper release velocity of carbon dioxide, global aragonite, calcite and acicular calcium carbide were obtained.
Lu
Zhong-yuan
ZY
Key laboratory for Advanced Building Materials of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010, China.
Kang
Ming
M
Jiang
Cai-rong
CR
Tu
Ming-jing
MJ
D000114:Acetylene / Q000031:analogs & derivatives* / Q000737:chemistry; D002119:Calcium Carbonate / Q000138:chemical synthesis* / Q000737:chemistry; D003460:Crystallization
C006873:calcium carbide; D002119:Calcium Carbonate; D000114:Acetylene