Еnergy-saving technology for processing of galvanic sludge with obtaining of radio-absorbing materials

• Дата: 2020
• Автори: Samchenko, Dmitry N., Kochetov, Gennadii М., Vasiliev, Aleksey
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Kyiv National University of Construction and Architecture 2020
• Теми: galvanic sludges; ferritization; electromagnetic pulse discharges; radio-absorbing materials
• Онлайн доступ: https://es-journal.in.ua/article/view/213160
• Назва журналу: Environmental safety and natural resources

The prospective for increasing of environmental safety level of industrial enterprises is considered as result of realization of energy- and resource saving technology for processing galvanic sludge by hydrophase ferritisation method. The possibility of obtaining Ni-Cu-Zn ferrites by processing of galvanic sludge based on of ferritization technology has been studied. Influence of different technological parameters and activation methods of the ferritisation process: thermal and electromagnetic pulse at temperatures of 75°С and 20°С, respectively, on qualitative and quantitative phase content of ferrite sediments has been experimentally determined. The method of electromagnetic pulse activation provides the appropriate degree of heavy metal ions extraction – 99.96%, and also has undeniable energy advantages over thermal, since energy consumption is reduced more than 60%. The efficiency of electromagnetic pulse discharges with magnetic induction amplitude of 0.298 T and a pulse frequency from 0.5 to 10 Hz to obtain environmentally friendly ferrite precipitates has been confirmed. The use of Ni-Cu-Zn ferrite powder for production of coatings that shield the electromagnetic rays in the ultrahigh frequency range is proposed. Obtained sediments have maximum content of crystalline ferromagnetic phases of ferrites – more than 93%. The proposed resource-saving ferritisation process prevents environmental pollution, ensures efficient and rational use of raw materials and energy in industry, as well as allows to obtain marketable products from industrial waste.