Method for adsorbing and recovering precious metal palladium by persimmon tannin-containing metal adsorbent

Abstract

The invention belongs to the technical field of natural product preparation and especially relates to a method for adsorbing and recovering a precious metal palladium by a persimmon tannin-containing metal adsorbent. The method can be widely used for adsorbing and recovering a palladium element in a secondary resource and has the advantages of low cost, large adsorption capacity, good environmental benefits and convenient operation. The method is characterized by comprising the following steps of 1, weighing a certain amount of a persimmon tannin-containing adsorbent, and adding the weighed persimmon tannin-containing adsorbent into a triangular flask, 2, adding a palladium ion-containing solution having a pH value in an appropriate range into the triangular flask, wherein the volume of the used palladium ion-containing solution is less than or equal to half of the volume of the triangular flask, 3, sealing an opening of the triangular flask by a sealing film, putting the sealed triangular flask into a shaking table, and carrying out shaking-table shaking adsorption at a shaking-table rotation rate of 100 to 200rpm at a temperature of 25 to 50 DEG C for 12 to 24h or carrying out chromatographic column adsorption at a chromatographic column mobile phase flow rate of 6 to 10mL / h for 12 to 24h, and 4, carrying out filtration so that the palladium ions in the palladium ion-containing solution are adsorbed by the persimmon tannin-containing adsorbent. The method also can be used for adsorbing and recovering a precious metal palladium by a chromatographic column.

Description

technical field [0001] The invention belongs to the technical field of preparation and utilization of natural products, and in particular relates to a method for absorbing and recovering precious metal palladium by using persimmon tannin-containing metals, which can recover palladium in secondary resources. Background technique [0002] With the development of society, countries all over the world demand more and more precious metals, while precious metal mines are decreasing day by day. At the same time, the amount of electronic waste is also increasing year by year, which has huge potential utilization value. The content of precious metals in secondary resources is generally much higher than that of precious metal ores. According to statistics, the content of palladium alone in 1 ton of randomly collected mobile phone casings (excluding plastics) is 0.1kg. Adsorption and recovery of precious metal palladium from secondary resources has the dual effects of saving resources...

AI Technical Summary

Problems solved by technology

The vast majority of traditional production areas are astringent persimmons, and they are mostly distributed in front of houses, behind houses and on the edge of fields. It is inconvenient to harvest fresh fruits as commodities; moreover, persimmons are easy to flower, and physiological fruit drop is relatively low in the young fruit stage (the period with the highest tannin content). In addition, about 50% of persimmon fruit in my country is usually used to make persimmons, and the resulting discarded persimmon skin accounts for 10% of the weight of fresh fruit

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