| 摘要 |
In the production of alkali metal borohydrides by reacting an alkali metal borate with hydrogen and an alkali metal at above 100 DEG C., the alkali metal borate is heated with silicon oxide coarser than 60 microns in a worm device to a temperature of 200 DEG to 350 DEG C. and then in a second stage, in a double paddle worm device, adding to the hot reaction mixture under a hydrogen atmosphere, a liquid alkali metal and keeping the temperature at 350 DEG to 400 DEG C. The resulting mixture may be further heated under a hydrogen atmosphere to 420 DEG to 450 DEG C., to complete the reaction. The grain size of the alkali metal borate is preferably less than 300 microns and that of the quartz between 200 and 400 microns. |
