A method for efficient selective adsorption recovery of rhenium and mercury from multi-component mixed waste acid of copper smelting

Abstract

The invention discloses a method for efficiently selectively adsorbing and recovering rhenium and mercury from multi-component mixed waste acids of copper smelting, and belongs to the technical field of comprehensive recovery of rare and precious metals. The process steps include pretreatment of resin, pretreatment of multi-component mixed waste acid, synergistic co-adsorption of rhenium and mercury in multi-component mixed waste acid, and analysis of rhenium and mercury in rich resin. The present invention uses weakly basic chelating anion exchange resin to directly and selectively absorb and recover rhenium and mercury from multi-component mixed waste acid of copper smelting, and optimizes the specific process, so that rhenium and mercury in multi-component mixed waste acid can be recovered. Mercury is recovered separately, which effectively improves the recovery effect of rhenium and mercury, realizes the recovery of rare metal rhenium in the copper smelting industry and the enrichment of harmful element mercury, which is beneficial to the subsequent production of rhenium and mercury related products, and its process is simple , short process, high product purity, low pollution, low cost and easy industrialization.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of rare and precious metals, and more specifically relates to a new method for simultaneously selectively adsorbing and recovering rhenium and mercury from multi-component mixed waste acids of copper smelting by using anion exchange resin. Background technique [0002] Rhenium is one of seven rare metals with an abundance in the Earth's crust of only 10 -8 %, is a veritable scattered metal. Rhenium has a high melting point second only to tungsten at 3170°C, its boiling point is as high as 5900°C, and its density is second only to heavy platinum group metals at 21.02g / cm 3 , rhenium's high melting point, high corrosion resistance and strong plasticity make it possible to form alloy materials with a variety of transition metals with excellent performance and "rhenium effect". , special crucibles, super-temperature materials, etc. have special and critical uses. At the same time, du...

AI Technical Summary

Problems solved by technology

[0011] However, when the ion exchange method is used to recover rhenium in waste acid in existing studies, basically only the adsorption performance and effect of the target element rhenium are considered, and the influence of mercury is not considered.

Since a small amount of mercury in copper smelting waste acid exists in the form of complex anions, the ion exchange resin will inevitably adsorb part of the complex anions of mercury in the waste acid during the process of adsorbing the target element rhenium, and in the process of analyzing the target element rhenium Part of mercury will also be decomposed together with rhenium, resulting in a certain amount of mercury ions in the rhenium-rich solution, which will pollute the rhenium-rich solution. In the concentrated solution, it is difficult to produce high-purity ammonium rhenate (above 99.9%). On the other hand, the mercury evaporated is highly toxic and becomes a serious pollution source.