A Textbook of Fire Assaying
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Sodium carbonate 30 grams Borax-glass 10. 7 " Litharge 60 " Flour (R. P. 12) 2i Silica 12. 8 " This charge contains 17. 0 grams of CaSi0 3 and 34. 6 grams of Na 2 SiO 3, or about twice as much sodium bi-silicate as calcium bi-silicate. Figure 3 shows that such a combination will melt at a reasonably low temperature. The lead silicate and the borax- glass will, of course, reduce this melting temperature materially. Following the procedure outlined above it may readily be de- termined that for pu...re calcium carbonate the charge shown below should be used: Ore . '. 1 A. T.
Sodium carbonate 30 grams Borax-glass 23. 6 " Litharge 60 " Flour 2J Silica. .. 28. 3 " THE CRUCIBLE ASSAY 167 This charge contains approximately equal amounts of the bi-silicates of sodium and calcium, as well as litharge and borax- glass. It fuses without difficulty and gives a glassy slag and a good separation of lead.
Figure 44 gives at a glance the quantity of reagents other than flour required to flux one assay-ton of any mixture of limestone and silica.
What to read after A Textbook of Fire Assaying?
You can find similar books in the "Read Also" column, or choose other free books by Edward Everett Bugbee to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Sodium carbonate 30 grams Borax-glass 10. 7 " Litharge 60 " Flour (R. P. 12) 2i Silica 12. 8 " This charge contains 17. 0 grams of CaSi0 3 and 34. 6 grams of Na 2 SiO 3, or about twice as much sodium bi-silicate as calcium bi-silicate. Figure 3 shows that such a combination will melt at a reasonably low temperature. The lead silicate and the borax- glass will, of course, reduce this melting temperature materially. Following the procedure outlined above it may readily be de- termined that for pu...re calcium carbonate the charge shown below should be used: Ore . '. 1 A. T.
Sodium carbonate 30 grams Borax-glass 23. 6 " Litharge 60 " Flour 2J Silica. .. 28. 3 " THE CRUCIBLE ASSAY 167 This charge contains approximately equal amounts of the bi-silicates of sodium and calcium, as well as litharge and borax- glass. It fuses without difficulty and gives a glassy slag and a good separation of lead.
Figure 44 gives at a glance the quantity of reagents other than flour required to flux one assay-ton of any mixture of limestone and silica.
What to read after A Textbook of Fire Assaying?
You can find similar books in the "Read Also" column, or choose other free books by Edward Everett Bugbee to read onlineMoreLess
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