Patent ID: 7968149

Claim:
A regeneration method for an electroless plating solution comprising: measuring a formation rate of a phosphorous acid formed in accordance with a nickel plating treatment in a plating tank to accumulate a plating solution in which nickel hypophosphite is used as a nickel source and at least one or more of nickel hypophosphite, sodium hypophosphite, and hypophosphorous acid are used as reducing agents, and applying the nickel plating treatment to a target material using the plating solution; generating a control signal for controlling a transfer rate based on the measured formation rate, and outputting the generated control signal to a splitter and a return pump; taking out a predetermined amount of the plating solution accumulated in the plating tank using a split pump, and receiving the plating solution taken out by the split pump into a meterage pot; adjusting the amount of the plating solution in the meterage pot to the predetermined amount of the plating solution; transferring the predetermined amount of the plating solution from the meterage pot to a stock tank in accordance with the control signal, when the control signal is received by splitter; measuring a concentration of the phosphorous acid contained in the predetermined amount of the plating solution taken out; calculating an amount of calcium carbonate or calcium hydroxide required for producing a calcium phosphite from the phosphorous acid contained in the predetermined amount of the plating solution based on the predetermined amount and the measured concentration of the phosphorous acid generating a seizing signal for controlling the transfer of the predetermined amount of the plating solution stocked in the stock tank to a processing tank based on the calculated amount of calcium carbonate or calcium hydroxide; supplying the calculated amount of calcium carbonate or the calcium hydroxide to the processing tank when the seizing signal is transmitted to another pump; separating and removing, from the plating solution, calcium phosphite formed by admixing the calcium carbonate or the calcium hydroxide supplied to the processing tank with the predetermined amount of the plating solution in the processing tank; and transferring the plating solution from which the calcium phosphite is separated and removed at the transfer rate in accordance with the control signal in cooperation with the splitter to the plating tank, when the control signal is received by the return pump.