Lithium hexafluorophosphate process capable of automatically adding acid

The invention discloses a lithium hexafluorophosphate process capable of automatically adding acid, which comprises the following steps of: 1, opening a refrigerant valve at the temperature of 50 DEG C below zero within the first hour, opening an acid adding valve, and closing the acid adding valve; 2, opening an acid adding valve to add acid for 5-20 minutes, and then waiting for cooling for 20-70 minutes or less than or equal to 80 DEG C; step 3, closing a-20 DEG C refrigerant valve, opening an acid adding valve, and closing the acid adding valve when the acid adding rate is 40g/h-80g/h and the total amount of added acid is 300-500g; fourthly, after 10-30 min, 30% of a heat conduction oil valve is opened; 5 min later, 50% of the heat conduction oil valve is opened; 5, raising the temperature for 10-40 minutes, closing an acid outlet electric valve of the metering tank, and waiting for the pressure of the reaction kettle to be 1t; and closing a gas-phase electric valve at the outlet of the reaction kettle, a