Vernyhora V. The improvement of environmentally safe grinding waste recycling technology

The analysis of the composition and properties of the grinding sludge, depending on the conditions of formation was elaborated in the dissertation. The toxic properties of sludge components, methods of distribution and influence on the environment and the person were considered and analyzed. The analysis of existing technological schemes and an ecologically and economically expedient way of utilization of sludge waste at the metal processing enterprises was developed. The series of experimental studies to determine the regularities of removing contamination from solid particles was conducted. To wash the sludge solutions with detergents "Labomid", "Judetic sodium", "Timelite" concentration of 10–30 g/l and with a temperature range of 25–45°C were used. In the course of research, it was found the solution with detergent "Labomid" has the best qualities of cleaning from contamination. The process of motion and separation of solid particles by density in a moving flow of a washing solution was theoretically investigated. The program in C++ in the C++ Builder environment, which describes the movement of metal and abrasive particles in the stream was developed. The equipment for the drying of solid particles of slime was developed, the kinetics of drying was analyzed, the formula for determining heat consumption for solid particles drying taking into account heat losses was obtained. The use of grinding waste disposal utilization was proposed: metal and abrasive particles, butter and washing solution use as secondary raw materials in various fields of industry. It was recommended to use metal particles as raw material for powder metallurgy. Abrasive particles were recommended for the manufacture of refractories in metallurgy of ferrous and nonferrous metals, as additional components in the manufacture of products for the construction industry and road surface. Separated oil from a washing solution can be used: in the construction for waterproofing, impregnation of wooden structures and railroad sleepers; as a fuel for energy purposes. The engineering solutions developed in the work allow to realize the technological process of utilization of grinding sludge from the standpoint of energy and resource conservation; solve the problem of waste accumulation. Key words: ecological safety, metal sludge, waste, washing process, mathematical model, washing solution, drying, oil separation, technology of utilization.