Preparation method of activated carbon capable of selectively adsorbing palladium

Abstract

The invention relates to a preparation method of activated carbon capable of selectively adsorbing palladium (II) and belongs to the technical field of non-ferrous metallurgy. Since the activated carbon has relatively strong adsorptive property, the activated carbon is widely applied in various fields of industry and life, however, and due to poor selectivity, the application of the activated carbon in recovery of a metal is limited. Therefore, the invention provides a treatment method of the activated carbon so that the activated carbon can selectively adsorb palladium (II) in a hydrochloric acid medium. The treatment method comprises the following steps: chlorinating the activated carbon as a precursor with Cl2 at a high temperature so that carbon-chlorine bonds are introduced into the surface of the activated carbon and then treating the activated carbon with Na2S so that sulfur ether functional groups are introduced into the surface of the activated carbon. Sulfur ether is an effective extractant of palladium (II) and thus the treated activated carbon has selective adsorption to palladium (II).

Description

Technical field: [0001] The invention relates to the recovery and utilization of valuable metals in waste circuit boards. Specifically, the principle of sulfide preparation is applied to the modification process of activated carbon, so that functional groups containing sulfur atoms are introduced on the surface of activated carbon, thereby increasing its resistance to palladium (II). The final product is used in the recovery of palladium from waste circuit boards. Background technique: [0002] Noble metals have many excellent properties, such as high catalytic activity, good high-temperature oxidation resistance, corrosion resistance, high melting point, low vapor pressure, good ductility, and high thermal stability, which are not easily replaced by other metals. Therefore, with the development of science and technology, precious metals are widely used in various fields of aerospace, precision instrumentation, chemistry and chemical engineering, medicine, and metallurgical indus...

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Problems solved by technology

However, because the coordination ability of nitrogen-containing functional groups and chlorine-containing functional groups to palladium is very weak, so the selectivity has no essential change; because of the high selectivity of sulfur-containing functional groups to palladium, the treatment of thiourea is a good choice, but The cycle of the product obtained by this method is poor, mainly because thiourea is enriched on the surface of activated carbon in the form of physical adsorption, and the active ingredients are seriously lost during the application process, resulting in a decline in product performance.

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