Method for concentrating and recovering noble metals from printed circuit boards of discarded mobile phones and catalysts of discarded cars using discarded nonferrous slag

Abstract

The present invention relates to a method for concentrating and recovering noble metals from printed circuit boards of discarded mobile phones and catalysts of discarded cars using discarded nonferrous slag, which is industrial waste discharged from a process for refining nonferrous metals such as copper, lead, zinc and the like, and more specifically, to a method for concentrating and recovering gold, silver, platinum, palladium, rhodium and the like contained in printed circuit boards of discarded mobile phones and catalysts of discarded cars by melting discarded nonferrous slag, printed circuit boards of discarded mobile phones and catalysts of discarded cars at a high temperature through a single process to reduce and separate iron oxide contained in the discarded nonferrous slag and simultaneously melting and separating copper, iron, tin, and nickel contained in the printed circuit boards of discarded mobile phones to use the generated iron, copper, tin, and nickel alloy as a collector metal for noble metals. The method for concentrating and recovering noble metals from printed circuit boards of discarded mobile phones and catalysts of discarded cars using discarded nonferrous slag of the present invention comprises the steps of: mixing and melting discarded nonferrous slag and a solvent, which is a slag composition controller; inserting printed circuit boards of discarded mobile phones and catalysts of discarded cars to the obtained molten metal to melt the same; and maintaining the same for a predetermined amount of time to separate the same into a noble metal-collected alloy phase and a slag phase containing no noble metals. In addition, the present invention relates to a method for recovering valuable metals such as iron, copper, tin, nickel and the like in addition to noble metals such as gold, silver, platinum, palladium, and rhodium from printed circuit boards of discarded mobile phones and catalysts of discarded cars, and recycling the generated slag without environmental problems. According to the present invention, the amount of the generated alloy phase is increased without using a collector metal for noble metals such as copper, iron, lead, and nickel and carbon as a reducing agent which increase processing costs by using discarded nonferrous slag, which is industrial waste discharged from a process for refining nonferrous metals such as copper, lead, zinc, and the like, as a solvent, which is a slag composition controller, and a noble metal collector simultaneously, and using a plastic component contained in printed circuit boards of discarded mobile phones as a reducing agent, and thus an alloy phase and a slag phase can be readily separated, thereby simultaneously reducing processing time and minimizing the amount of a solvent such as alumina (Al2O3), quicklime (CaO), magnesia (MgO), iron oxide (FeO) and silica (SiO2). Accordingly, noble metals such as gold, silver, platinum, palladium, rhodium and the like can be concentrated and recovered through a single process by simultaneously treating different industrial waste such as printed circuit boards of discarded mobile phones and catalysts of discarded cars, and waste material can be recycled to be used as a material for the high-technology industry, and thus it is possible to maximize the coefficient of utilization of noble metal resources in resource-poor Korea, which depends on imports for all of noble metal resources.

Description

technical field [0001] The present invention relates to the recovery of precious metals from waste mobile phone printed circuit boards (PBC) and waste automobile catalysts, which are used as Raw materials for high-tech products. More particularly, the present invention relates to a method for enriching and recovering precious metals from discarded mobile phone PBC and discarded auto catalysts using non-ferrous metal waste slag, the method comprising adding non-ferrous metals to discarded mobile phone PCBs and discarded auto catalysts Waste slag and caustic lime (CaO) are used as a flux to control the slag composition, followed by melting at high temperature, thereby removing precious metals such as Gold, silver, platinum, palladium and rhodium are captured and enriched in metals such as iron, copper, tin and nickel contained in non-ferrous metal waste slag and discarded mobile phone PCBs, and the captured and enriched precious metals are recovered. In the present invention, ...

AI Technical Summary

Problems solved by technology

However, this method has the disadvantage of requiring a large amount of metals such as copper, nickel, iron or nickel for trapping noble metals, various fluxes such as alumina (Al 2 o 3 ), caustic lime (CaO), magnesium oxide (MgO), iron oxide (FeO) or silicon dioxide (SiO 2 ), and reducing agent carbon, which increases the production cost

In addition, a dedicated furnace-based method that does not use metals such as copper, iron, lead, or nickel for trapping noble metals has a disadvantage in that the alloy phase is difficult to obtain from the residue phase because the amount of the alloy phase obtained in this method is small. Separation in the middle, resulting in increased processing time

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