Precipitated calcium carbonate is an inorganic substance obtained by heating and decomposing calcium bicarbonate. Its chemical formula is CaCO3. Precipitated calcium carbonate has high purity and whiteness, so it is widely used in cosmetics, food, medicine and other fields. Xiangfa Powder, a brand of calcium carbonate powder, will introduce the preparation process and precautions of precipitated calcium carbonate.

Precipitated calcium carbonate (PCC) is an inorganic substance obtained by heating calcium bicarbonate. Its chemical formula is CaCO3. PCC has high purity and whiteness, so it is widely used in cosmetics, food, and medicine. Xiangfa Powder, a brand of calcium carbonate powder, will introduce the preparation process and precautions of PCC.

　　Pharmaceutical grade calcium carbonate manufacturer

　　1. Preparation process of precipitated calcium carbonate

　　There are two main methods for preparing PCC: the cyclone sedimentation method and the dry calcium carbonate method.

　　(1) Cyclone sedimentation method

　　The steps are as follows:

　　1) Mix and stir the calcium salt and carbonate aqueous solutions, adjust the pH to 7-8, and add a surfactant to adjust the particle size.

　　2) The mixed solution is subjected to cyclone sedimentation through a cyclone separator, and the resulting solid particles are filtered, washed, dehydrated, and dried to obtain PCC.

　　(2) Dry calcium carbonate method

　　The main steps are as follows:

　　1) Mix and stir the calcium salt and carbonate aqueous solutions, adjust the pH to 7-8, and compress the water out of the mixed solution using a wind-cooled extruder to form calcium cakes.

　　2) The calcium cakes are explosion-dried to make them expand and break, and finally screened, washed, dehydrated, and dried to obtain PCC.

　　2. Precautions

　　(1) Raw material requirements

　　The raw materials for preparing PCC require high purity and no impurities, especially the calcium salt and carbonate aqueous solutions used must be pure.

　　(2) Reasonable process flow

　　The process flow for preparing PCC must be reasonable, and the operation of each step must be standardized. For example, in the dry calcium carbonate method, the temperature and time of explosion drying should be adjusted according to the actual situation, otherwise it will affect the quality of the final product.

　　(3) Equipment maintenance

　　The preparation of PCC requires the use of equipment such as cyclone separators and wind-cooled extruders. This equipment needs to run for a long time and must be well maintained. For example, the cyclone blades in the cyclone separator should be kept clean to prevent sediment from accumulating on them.

　　(4) Pay attention to safety

　　During the preparation of PCC, strictly follow the safety operating procedures to avoid accidents caused by improper operation.

　　In summary, the preparation of PCC is a strict process that requires high-purity raw materials, standardized operating procedures, good equipment, and reasonable safety measures to ensure the stability and reliability of product quality.