简介：How Is Iron Smelt? narrates that iron exists as an oxide in the nature. In order to obtain pure iron, iron shall be smelt. The ironmaking technique of China may date back to 3500 years ago. At the beginning, people could only smelt iron ores into lumps and then make ironware through the forging technique. With technical progress, iron ore may be smelt into molten iron under high temperature and be made into pig iron.
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