酸化カドミウム

解説酸化カドミウム,製造法により淡黄色から黄褐色，赤褐色まで変化する．無定形粉末．密度6.95 g cm－3．酸素気流中で長く加熱すると暗赤色の六方晶系の結晶(密度8.15 g cm－3)となる．強熱すると700 ℃ で昇華する．水，アルカリに不溶，酸に易溶，アンモニア水，アンモニウム塩水溶液に可溶．水素および一酸化炭素気流中で加熱すると，還元されて金属カドミウムが得られる．森北出版「化学辞典（第2版）

用途顔料、耐食表面処理

用途カドミニウム鍍金浴の添加剤、電池

使用Cadmium oxide is used as an electroplating chemical, catalyst, component of semiconductors, and starting material for PCV heat stabilizers; in glass and ceramic glazes; for production of cadmium electrodes in storage batteries; and in other applications.

一般的な説明Brown crystals or brown amorphous powder. Used as an electroplating chemical and in the manufacture of cadmium electrodes. Is a component of silver alloys, phosphors, semiconductors, glass and ceramic glazes. Formerly used by veterinarians to kill worms and parasites.

Cadmium oxide is manufactured commercially by distilling cadmium metal from graphite retort and allowing vapor to react with air.

製造方法Cadmium oxide is prepared by the reaction of cadmium vapor with oxygen. The metal is first melted in a steel retort and transported into a heated chamber where it is vaporized. The vapor is reacted with air, and the cadmium oxide formed is collected in a bag house. The particle size of the product depends on the ratio of air to cadmium vapor. The oxide may be further purified and particles of uniform size may be obtained by calcination at low red heat. Cadmium oxide also may be prepared by several other routes starting with various cadmium salts. The compound can be made by thermal decomposition of cadmium carbonate or cadmium hydroxide: CdCO3 → CdO + CO2 Cd(OH)2 → CdO + H2O Similar thermal decomposition of cadmium nitrate or sulfate would yield the oxide. he oxide. Cadmium oxide also may be made by high temperature oxidation of cadmium sulfide: 2CdS + 3O2 → 2CdO + 2SO2 Finely divided oxide may be obtained by pyrolysis of cadmium salts of carboxylic acids, such as cadmium formate or oxalate. (COOH)2Cd → CdO + H2O + 2CO (COO)2Cd → CdO + CO2 + CO