Metal-Cutting Fluid Purification Equipment

Metal-cutting fluid (MCF) in machining process commonly used to play several roles, such as cool, lubrication, cleaning and rust-proof. With the fast development of modern machinery manufacturing industry, the usage of MCF is increasing rapidly. However, cutting fluid has a common drawback, that after the use of a certain period it will degenerate into industrial wastewater. Wastewater discharge will cause serious environmental pollution and damage, so the use of metal-cutting fluid and the disposal of wastewater have been subject to increasingly stringent environmental protection laws and regulations restricting. Researching on the promotion of effective technology which can regenerate MCF or treat waste liquid has become an important research subject in the modern cutting field."Metal-cutting fluid on-line cycle purification equipment" is an environmentally friendly and energy-saving equipment, which can extend the service life of MCF, reduce waste fluid discharge, meanwhile accord with clean production and circular economy concept very much. The success of this device's research and development will reduce production costs for consuming company and lower surface roughness and improve the accuracy for workpieces, and improve the environment protection and reduce contamination emissions.The reasons which can cause metal-cutting fluid corruption and degeneration were analyzed detailedly, and then the appropriate technology and equipment was adopted to reduce and eliminate these factors. The experiment was mainly taken multi-level magnetic separation technology combined with ozone– air flotation technology to realize metal cutting fluid purification. And the performance indicators of purification treated metal-cutting fluid were evaluated. The results can meet the related MFC national standards, so that the service life of MCF is to be extended, and achieving the purpose of recycling, the experiment proved the effectiveness of the device ultimately.The best process parameters of the equipment operation were determine by the detection of oil content, the total number of bacteria, conductivity, SS, pH, and other changes in experiments. Which is included that continuous operation of equipment, water influent flow was 300L/h, gas - liquid contact reactor was the bubbling reactor tower, ozone and water contact style was bubble-style approach; ozone input is using multi-phase medium pump to add; the volume of adding into the water was controlled to 10% of the influent flow; the optimistic pressure of co-coagulation and dissolved-air flotation separation technology was 0.15MPa; the best time to cycle was 40 minutes.