Recovery of Gold from Radioactive Gold Waste Using The Redox Replacement Method with Zn-Foil Reductor

Abstract

The residual waste of synthesis and use of radioactive elements of gold 198Au as a radiopharmaceutical and tracer after decaying can be reused as an irradiated target material. The gold recovery process was carried out on Au-198 radioactive nano gold waste with the redox replacement method using Zn-foil as metal reducing agent. Radioactive Au-gold waste was stored until it decayed to its background, so it is not dangerous and does not interfere with the optical characterization process. The sample was dissolved with aquaregia and evaporated so that the chelating or dendrimer material can be released and oxidized. The evaporation was done to reduce acidity and obtain the salt. Furthermore, the salt solution of HAuCl4 is reduced with Zn-foil so that the pure gold deposits can be obtained through a redox process. The results of the XRF analysis showed that the gold deposits formed have fairly good purity with little Zn and Zr impurities derived from the erosion of the melting container. The yield calculation results based on ICP-OES data obtained a recovery percentage of 68.73%. The method of taking gold deposits must be increased to reduce the gold particles attached to the bar stirrer and to the melting pottery container.

An N-Rich Polymer for the Selective Recovery of Gold from Wastewater

“…where Q e (mg/g) is the theoretical adsorption capacity; C 0 (mg/L), C e (mg/L), and C t (mg/L) are the initial, equilibrium, and moment t concentrations of the metal ions, respectively; W (g) is the mass of the adsorbent used; and V (mL) is the volume of the solution. Adsorption experiments were conducted in a water bath thermostatic oscillator at 298 K. The experiment examined the effect of pH by placing 10 mg of adsorbent into 20 mL of 100 mg/L Au(III) solution with varying pH levels (1)(2)(3)(4)(5)(6)(7)(8)(9). Similarly, 10 mg of adsorbent was added to 20 mL of a 100 mg/L Au(III) solution at the same pH.…”

“…Various methods have been developed for gold recovery, including precipitation [7], replacement [8], solvent extraction/reverse extraction [9], and adsorption [10]. Among these, adsorption is a commonly used and advantageous method because of its simple synthesis of adsorbent materials, ease of operation, and low cost.…”

The State of Critical and Strategic Metals Recovery and the Role of Nuclear Techniques in the Separation Technologies Development: Review

“…The method is particularly helpful in examining extraction parameters such as the extraction coefficient and equilibrium time. Such parameters can be determined using radioactive isotope 198 Au [136]. An aqueous solution (aqua regia containing Au) was labelled with 198 Au, while diethyl malonate was utilized as an extractant.…”