Lactic acid was added calcium hydroxide or calcium oxide and the reaction

Lactic acid at 50% of the product was added calcium hydroxide or calcium oxide for neutralization reaction, and then filtered to remove insoluble impurities, and then cooling crystallization, separation, drying products. This process is simple, but the cost is higher. 2C3H6O3 + Ca (OH) 2 → (C3H5O3) 2Ca +2 H2O gelatinization of rice by high pressure, diluted with water cooled to 50-53 ℃, access Aspergillus and Calcium lactate delbrueckii, zinc lactate fermentation metabolites, calcium phosphate and then added to obtain a crude calcium lactate, and finally purified , or with potassium lactate and dilute acid solution, and then the solution was evaporated in the system. Refining process is the use of magnesium hydroxide and magnesium hydroxide reacts with calcium, it is the nature of cohesion, so that part of the fermentation broth and protein impurities removed after condensation, and then concentrated in vacuo, crystallization, refining lactate.