Obtaining inorganic pigments from galvanic waste
A feature of waste from galvanic industries (GW) is a high content of heavy metals (HM) exhibiting chromophore properties. Thanks to the chromophore elements, GW can be used as secondary material resources for the synthesis of inorganic pigments (IP). At present, technologies have been developed for producing IPs of a wide color range based on mono- and polychromophoric GW. For the production of IPs, GW containing in their composition elements such as zinc, iron, chromium, nickel, lead, copper can be used. The main method for obtaining IP is the selective precipitation of HM salts with subsequent calcination of the precipitate. To achieve the desired color effect, it is possible to combine slimes of various compositions. The most promising direction of GW processing can be the production of IPs for dyeing ceramic products. High-temperature treatment promotes the transition of HM into an environmentally friendly form due to the immobilization of the corresponding cations in the ceramic matrix. The data obtained as a result of scientific research creates a reliable experimental base for the implementation of promising technological solutions into practice.