In rural areas all over the country, when dismantling and repairing wood stoves or kilns, the sintered clods are removed, and the charred parts and impurities are cut off with a knife. Also known as fulonggan. It mainly contains silicic acid, lead oxide and iron oxide, in addition, it also contains sodium oxide, potassium oxide and magnesium oxide.
Pay attention to the identification of kitchen soil
1, must be calcined to the extent that there is no soil in the middle. If the whole kitchen soil is cut and there is yellowish raw soil in the middle, this kitchen soil cannot be used as medicine.
2. The core soil refers to the clod sintered around the grate, which is located in the center of the furnace, so it is satisfactory.