Abstract
When Engel's salt is heated at the temperature higher than 550°C for 30 minutes, the potassium contained in this double salt completely changes into potassium carbonate, When it is extracted by water, it can be separated from the residue as potassium carbonate solution. In addition, when this solution is concentrated, crystalized potassium carbonate can be obtained. Thls crystal contains 1.5mol of water, but scarecely contains magnesium and other impurities. The yield of potassium thus obtained amounts to 93%. The residue obtained by removing potassium carbonate solution seldom contains potassium. It is not pure magnesium oxide, but it is considered basic magnesium carbonate or a mixture of baslc magnesium carbonate and magnesium oxide.
