Recycling method for valuable metal in electronic waste

Abstract

A recycling method for valuable metal in electronic waste includes the following steps that the electronic waste and a slag former are mixed to obtain a mixed material, wherein the electronic waste accounts for at least 10% of the mass of the mixed material; the mixed material is put into a smelting furnace for high-temperature smelting, wherein the smelting temperature is controlled to range from 1300 DEG C to 1450 DEG C, and the smelting time is longer than 10 min; and an oxidizing agent is added into the furnace in the high-temperature smelting process, and Cu-Sn alloy and furnace slag containing CaO and SiO2 are generated through smelting, wherein Fe accounts for less than 15% of the Cu-Sn alloy, and the CaO or SiO2 accounts for more than 0.25% of the furnace slag. The recycling method has the beneficial effects that the technological operation is simple, the waste is sufficiently utilized, the valuable metal recycling rate is high, energy consumption and cost are low, and the economic and environmental benefits are good.

Description

technical field [0001] The invention relates to the technical field of resources and the environment, in particular to a method for recovering valuable metals from waste materials, the valuable metals particularly including copper, tin, gold, silver and the like. Background technique [0002] In recent years, the frequent replacement of products in the electronics and information industries has resulted in the generation of a large amount of electronic waste, especially the number of discarded printed circuit boards, which is increasing year by year at an astonishing rate. Printed circuit boards are the foundation of the electronics industry and an indispensable and important part of various electronic products. Printed circuit boards are mainly composed of organic reinforced resin, glass fiber, copper foil and electronic components, which contain a large amount of valuable metals (such as copper, tin, iron, aluminum, lead, etc.), and also contain precious metals (such as go...

AI Technical Summary

Problems solved by technology

Although this method has the ability to recycle precious metals in waste mobile phone circuit boards and waste automobile catalysts at the same time, it also has the following problems: (1) The smelting process needs to add waste mobile phone circuit boards and waste automobile catalysts at the same time, which cannot be recycled separately Electronic waste with huge output and reserves (such as waste mobile phone circuit boards) has limited process applicability; (2) Although waste mobile phone circuit boards and waste automobile catalysts contain a large amount of precious metals, their respective main components (base metals) There are obvious differences in the elements and their contents. Smelting together results in a complex alloy phase composition. The alloy contains not only Cu and Sn, but also Ni and Fe. Although this complex alloy can efficiently capture precious metals, it increases the follow-up. Difficulty in separating and purifying precious metals