RECOVERY OF POTASH IX THE BLAST-FURXACE INDUSTRY. 19 
total of 13.1 pounds. The potash in the slag amounts to 8.2 pounds, 
which leaves a balance for the potash volatilized of 4.9 pounds per 
ton of pig iron. This amounts to a total for all plants of about 
84,000 tons annually, as compared with 87,000 tons for the cement 
industry. As there are twice as many blast furnaces as cement plants 
in the United States, the quantity of potash lost per individual plant 
must therefore be less in the blast-furnace industry than in the cement 
industry, but it is possible that the dust from some blast furnaces in 
which manganiferous or southern ores are used may be richer than 
the richest cement dust. 
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