METHOD AND DEVICE FOR ELECTROEXTRACTION OF HEAVY METALS FROM INDUSTRIAL WASTE SOLUTIONS AND WASTE WATERS Russian patent published in 2004 - IPC

FIELD: purification of electrochemical industry waste solutions and waste waters. SUBSTANCE: the invention presents a method and a device, that are used in purification of industrial waste solutions and waste waters for electroextruction of heavy metals such as Fe, Cr-3, Cu, Zn, Cd, etc. Such waste waters are usually formed at the enterprises of chromium compounds, nonferrous metallurgy and the enterprises of electroplatings. The treated solution, which is under effect of a variable three-phase electric power current, is periodically passed through the bipolar electroreactor made of a non-currentconducting material and containing six steel electrodes forming two three-electrode packs. At that electrodes at least of one pack are connected to three different phases of a three-phase current. The current may be supplied either to one of the three-electrode pack or connection of phases of a three-phase current may be executed in parallel to both packs. A fixed bipolar aluminum electrode is located in the interelectrode space. In one of its design versions it has a form of a perforated container made of the heat-resistant plastic filled in with a secondary aluminum or duralumin waste. According to other version the bipolar electrode made of a (duralumin) an aluminum waste may be manufactured without application of the perforated container. In this cars it is located in the interelectrode space by a pouring method. In the version to prevent a short-circuit each of the six steel electrodes is mounted in an insulating perforated plastic jacket interelectrode space a bulk image. Separation of non-ferrous metals is exercised in the form of sediments of chromites, ferrites and aluminates, and also hydroxy salts in the interelectrode space in absence of sediments of electrolysis on the electrodes. Then the sediments are separated from the waste solutions or waste waters using the known methods of filtration. Technical result an accelerated process of purification at the expense of increase of speed of separation of heavy metals, increase of productivity of the device without increase of non-productive loss of the electric power, decrease of the purification units sizes, increase of number of periods of their use in an operating mode. EFFECT: accelerated process of purification and speed of the heavy metals separation, increased productivity, decreased power consumption and the purification units sizes. 23 cl, 7 dwg, 7 tbl, 6 ex