Abstract
An investigation has been made of the chemical properties of glasses in which the increasing amount of lime has been replaced by the increasing amount of ferric oxide or by ferrous oxalate.
The sample used for the tests is the glass powder of 20 to 30 mesh screen size (Tylor Standard Sieve).
The investigation of the solubility in water requires the treatment of 5g powdered sample in 100c.c. distilled water contained in a flask, immersed in the boiling water for one hour and the measurement of the amount of alkali liberated from the glass into the water.
The testing method of solubility in hydrochloric acid, sodium carbonate, and sodium hydrox iderespectively requires a treatment of 5g powdered sampl ein a basket of platiuum gauge immersed respectively in 20.24% HCl. 2N⋅Na2CO3, and 2N⋅NaOH each being contained in a flask kept in a boiling water bath for one hour and the measurement of the loss of the weight.
The solubility in water shows a marked decrease in the glasses, in which a small amount of lime has been replaced by a small amount of iron oxide, and no appreciable decrease is seen in the glasses containing a larger amount of iron oxide.
The results shows:- That in hydrochloric acid does not seen to depend upon the content of iron oxide. That in sodium carbonate solution presents a certain decrease till the definite value. That in caustic soda solution gives the minimum point at the glass, in which 2% of lime is replaced by 2% of iron oxide.
It is concluded that all these results have no dependence upon the state of oxidation of the iron oxide in the glasses.
