Abstract: There is provided a method for liquid mixing supply fabricating a mixed etching solution in which sulfuric acid, hydrogen peroxide, ultra pure water and hydrofluoric act are mixed together. The method includes: supplying a specific liquid chemical to a mixing tank such that it is mixed in ppm units; and supplying at least two liquid chemicals and a ultra pure water to the mixing tank at a predetermined ratio, and mixing them, wherein starting points of supplying the at least two liquid chemicals and the ultra pure water are different from each other. Since the starting points of supplying the sulfuric acid, the hydrogen peroxide, and the ultra pure water are different, it is possible to minimize the heat generation due to the reaction between the sulfuric acid with the hydrogen peroxide.

Abstract: There is provided a method for liquid mixing supply fabricating a mixed etching solution in which sulfuric acid, hydrogen peroxide, ultra pure water and hydrofluoric act are mixed together. The method includes: supplying a specific liquid chemical to a mixing tank such that it is mixed in ppm units; and supplying at least two liquid chemicals and a ultra pure water to the mixing tank at a predetermined ratio, and mixing them, wherein starting points of supplying the at least two liquid chemicals and the ultra pure water are different from each other. Since the starting points of supplying the sulfuric acid, the hydrogen peroxide, and the ultra pure water are different, it is possible to minimize the heat generation due to the reaction between the sulfuric acid with the hydrogen peroxide.