An investigation of the silica deposits of southern Illinois . s (novaciilite trials forthe remainder of the bonds disintegrated in v/ater) the bonds for temperatures upto Cone 10 show the least effect, and Ti02jius CaO and Un02 plus CaO have agreater effect upon the rate of inversion in the order mentioned. The curvescross at this temperature and the pieces v/ith Fe203 bond show a lower specificgravity. This is probably due to the Fe203 decomposing partially to FeO and^®2^3 ^^^ combining with the silica and producing a more powerful flux thanthe Ijln02 or Ti02. From euteotic melting temperatu
An investigation of the silica deposits of southern Illinois . s (novaciilite trials forthe remainder of the bonds disintegrated in v/ater) the bonds for temperatures upto Cone 10 show the least effect, and Ti02jius CaO and Un02 plus CaO have agreater effect upon the rate of inversion in the order mentioned. The curvescross at this temperature and the pieces v/ith Fe203 bond show a lower specificgravity. This is probably due to the Fe203 decomposing partially to FeO and^®2^3 ^^^ combining with the silica and producing a more powerful flux thanthe Ijln02 or Ti02. From euteotic melting temperatures given in Spreschaal Kal-endar 1916-7, iinO. Si02 plus JaO*Si02 as forming at 1134°C and 4Fe0»Si02 plusCaO»Si02 as melting at lOSQOC. This would, however, show FeO as having a ^Handbook of Chemistry and Physics -The Chera. Rubber Co. Page 39 ^Rankin and V/right -Ternary System CaO-Al203-8102 Bowen and Anderson -Binary System I-!go-Si02 Am. Pp 487-88.^Fenner - - Llilkiness in Optical 27. greater effect at lov/er temperatures than MnO, but since no data can be foundupon the eutectics between FegO^ and Si02 or MnOg and Si02 no comparison can bemade from this standpoint. These three bonds, Fe202, IvInOg plus CaO, and Ti02plus CaO all produce a greater rate of inversion than AlgO^, Ball Clay, andCr-0 , as would be expected due to the comparative refractoriness of these mat-erials nixed with silica. In comparing the two series the AI2O3, Ball Clay, CrgOg ojid TiOg plus CaObonds act similarly to the MgO bond, up to the comparable limit. The Albany Slipacts similarly to CaO, and the Lin02 plus .CaO follows the CaSO^ closely in thetests upon white silica. With novaculite and gannister, the Albany Slip doesnot show this, but tends to act like the LlgO. The results obtained in thesecond series, as a whole, do not shov; the distinct differences apparent in thefirst series. Because of this, no definite conclusions
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