Sulfuric acid adding facility

Provided is a sulfuric acid adding facility having a configuration in which a drain discharge line is connected to a pump head of a diaphragm pump, wherein the occurrence of trouble in the drain discharge line caused by vibration of the diaphragm pump is suppressed. The present invention is provided with a sulfuric acid supply pump for supplying a sulfuric acid to be added to ore slurry in an autoclave in a leaching step of a high-pressure acid leaching method for nickel oxide ore. The sulfuric acid supply pump is configured from a diaphragm pump equipped with a pump head having a drain discharge port, wherein a manual valve is directly attached to the drain discharge port of the pump head by using a nipple.