Process for preparing calcium lactate by secondary liquefication method

The invention discloses a process for preparing calcium lactate by a secondary liquefication method, relates to a preparation method of calcium lactate, and is used for solving the problems of raw material coking, low yield and large loss in the prior art. The process comprises the following steps of: stirring corn flour, water, calcium lactate and amylase uniformly, and adjusting the pH value to be 6.2 to 6.3 and the Baume degree to be 12.5 to 13.5 Be; conveying raw materials into a high-pressure maintaining tank at the temperature, which is 125 to 130 DEG C, of an ejector and conveying the raw materials into a flash tank through a laminar flow pipe; conveying into a liquefication tank, adding amylase and corn pulp at 90 to 95 DEG C and maintaining 2 to 3 hours; adding hydrolysate, cooling to 58 to 60 DEG C, adding saccharifying enzyme, adjusting the pH value to be 4.4 to 4.6 and saccharifying for 48 hours; adding water, adjusting the temperature to be 49 to 51 DEG C, adding calcium carbonate, inoculating la