| 摘要 |
Known absorber materials for CO2 in protective respiratory apparatus do not granulate very easily. The granules have a low cohesion and tend to form dust. Harder granules which no longer permit formation of dust are obtained by addition of an alkaline salt of an oxyacid, preferably sodium hoxamotaphosphate, to the calcium hydroxide paste before granulating. Other salts of oxyacids e.g. orthophosphoric acid, sulphuric acid, permanganic acid, chromic acid and vanadic acid, can also be used. In this way the cohesiveness of the calcium hydroxide granules is increased considerably without the absorbing capacity for CO2 being impaired. |
