METHOD FOR CONTROLLING AL CONCENTRATION USING DOUBLE PRE-MELTING POT

摘要

PURPOSE: A method is provided which online controls concentration of Al injected into a plating pot by decreasing change of an Al concentration of the plating pot and maintaining the Al concentration close to the standard range. CONSTITUTION: The method for controlling Al concentration using a double pre-melting pot comprises the processes of installing a pre-melting pot for a minimum Al concentration(9) and a pre-melting pot for a maximum Al concentration(10) in front of a plating pot(4) respectively; installing rectangular parallelepiped Zn rods(13) on each of the pre-melting pots(9,10); installing a laser type displacement sensor(14) measuring a height of the level of molten metal of the plating pot(4); installing a computer(12) which reads an Al concentration of the plating pot(4) and a height of the level of molten metal from the measured values of the displacement sensor(14) and calculates a required plating amount; calculating a plating amount to be injected into the plating pot(4) from each of the pre-melting pots(9,10) by computer(12); and over flowing a plating solution in the pre-melting pots(9,10) into the plating pot(4) by the rectangular parallelepiped Zn rods(13).