Method for recycling palladium from alkaline palladium activation section waste water

Abstract

The invention provides a method for recycling palladium from alkaline palladium activation section waste water. The method includes the following steps that 1, reduction is conducted; obtained raw palladium is dissolved with aqua regia, undissolved substance is filtered out, and the volume mass ratio of the aqua regia and the raw palladium is 5-6 to 1 L / kg; 3, filtering and dilution are conducted; 4, ion column adsorption is conducted; 5, ion columns are cleaned; 6, ion columns are regenerated; 7, palladium is recycled through regenerated liquid. According to the method, anion resins are used to selectively adsorb [PdCl4] <2->, base metals of copper, nickel and the like are effectively separated, the method is simple and easy to operate and control, the recycling rate is larger than 96%, and the product purity is larger than 99.98%.

Description

technical field [0001] The invention relates to a method for recovering palladium from wastewater in an alkaline palladium activation workshop. Background technique [0002] Electroless plating is a surface strengthening method to improve the wear resistance and corrosion resistance of metal and other materials. With its continuous development and improvement, it has been widely used in petrochemical, electronic technology, aerospace, machinery manufacturing, and precision instruments. and chemical industries. In particular, it can effectively prolong the life of aircraft parts by dozens to hundreds of times, and effectively promote the development of the aerospace industry. With the expansion of the scope of application of electroless plating, there are more and more types of substrates for electroless plating, and the catalytic activity of the substrates varies greatly. Usually, it is necessary to perform pre-plating activation treatment on the substrate to obtain high s...

AI Technical Summary

Problems solved by technology

After the ionic palladium activation solution is activated in the activation section, it becomes palladium activation wastewater. However, because palladium is a precious metal, its price is expensive. If the palladium activation wastewater is ignored, it will inevitably lead to a sharp increase in production costs. Therefore, from The recovery of palladium from palladium activation wastewater is a technology that every manufacturer attaches great importance to.

[0004] At present, the recovery and purification of palladium in China mostly adopts the traditional precipitation, complexation, acidification, calcination and hydrogen reduction process, the dosage is large and the procedure is complicated, and the wet purification process of palladium is also used. The extraction process is generally: acid dissolution→silver removal → purification → ammonia precipitation → hydrochloric acid acidification → hydrazine hydrate reduction → palladium, however, although its process can effectively purify palladium, it cannot effectively separate base metal ions such as copper and nickel in the solution, resulting in the purity of the recovered palladium reaching Less than 99.9%, affecting its selling price

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