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... hing, just over ten tons of black iron sand yielded more than two thousand jin of low-grade pig iron, over two hundred jin of pure iron, and about one hundred and thirty or forty jin of tamahagane, with a conversion rate of around 12%.
And that’s not the end of the losses—these two thousand-plus jin of pig iron can’t be used directly, and need to be laboriously forged into wrought iron by hand. If it’s for making ordinary household tools, there’s still about 30% more lost in the process; ...
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