A study of nitrogen solubility in Na2O-B2O3 slag

Abstract

The nitrogen solubility and nitride capacity of a Na2O-B2O3 slag system were investigated in a concentration range of Na2O mass contents up to 40 % at 1373K. The solubility of nitrogen in Na2O-B2O3 slag was found to be proportional to the oxygen partial pressure to the power of -3/4, and it was also found to increase with increasing reaction temperature. The nitride capacity of the slag decreased with increasing Na2O content. From the experimental results it was concluded that nitrogen dissolution into Na2O-B2O3 slags (Na2O mass contents < 40 %) occurs by its reaction with both free oxygen ions and with oxygen ions incorporated with the network.