In recent years, with the strengthening of the world’s influence in China and the implementation of the One Belt One Road Strategy, the G20 Summit was held in Hangzhou in September 2016, and the meeting of the five countries in Xiamen in September 2017 was held. The state’s requirements for environmental protection are increasing. More and more strict. In the establishment of the National Environmental Protection Inspectorate and the determination to rectify reforms, the entire coastal area, the “Pearl River Delta†and the “Yangtze River Delta†represented thousands of water, gas, printing and dyeing electroplating, metal processing plants, and manufacturing industries. Failure, forcing companies to upgrade and transform. As early as 1998, the National Environmental Protection Agency, the State Economic and Trade Commission, the Ministry of Foreign Trade and Economic Cooperation, and the Ministry of Public Security formulated the “National Catalogue of Hazardous Wastes†in accordance with the “Law for the Prevention and Control of Environmental Pollution by Solid Waste of the People’s Republic of Chinaâ€, which clearly stipulates waste soaps, Emulsified oil/water, hydrocarbon water mixtures, emulsified liquids, etc. are hazardous wastes. Therefore, the old cutting fluid cutting fluid emulsified oil must be treated professionally, guided and processed before it can be discharged. I have been engaged in the wire cutting EDM environmental protection processing industry for more than 20 years. Combined with the experience of environmental protection requirements of EU, Japanese and foreign companies, and industrial regions in various regions, I now share the relevant experience in the treatment and discharge of the old liquid in the fast and medium-moving machine tools. Business owners in the process of creating wealth value, in the process of undertaking social responsibility, reduce blind spots, avoid detours, and avoid fines.
First, the selection of processing fluid
First of all, we must choose the real green water solution cutting fluid. The truly green process fluid must not contain harmful substances such as sodium nitrite, silver nitrite, hexapotassium chromium, heavy metals and pollution sources. Most of the "water-based" cutting fluids on the market are "semi-synthetic water-soluble oils" and contain a lot of non-standard mineral oils. This is not a truly green process fluid.
In the actual processing and production, we should do: 1. Standard use, adding water for changing strictly; 2. Creating conditional centralized supply of liquid and uniform use of old liquid; Centralized liquid supply can improve utilization rate and processing efficiency of working fluid and maintain Working fluid processing stability, maintain a good cooling, chip removal. 3, concentration management; 4, regular care, diluted three waste detection.
Second, the cleaning of machine tool circulation system
In the actual processing and production, the old liquid contains a large amount of metal powders and impurities such as molybdenum, iron, carbon powder, sludge, etc. At the same time, the dead angle of the water tank and the pipes and the valve of the pump valve also accumulated a certain amount of metal powder and impurities. . Therefore, when changing the liquid, thoroughly clean the water tank, work bench, and pipe, with two intervals of 30 minutes (the interval time is a sterilization time), and each time requires 10 minutes for cleaning. Cleaning methods: 1, you can add appropriate amount of detergent with water, open the pump cycle 0.5 hours. 2. Use 5% of industrial cleaning agent and 0.2% of the circulator fungicide of the machine tool to dissolve in 100% of clean water. In winter, use boiling water with heating not less than 60 degrees to clean it. Turn on the pump for 0.5 hours and wash it twice.
Third, non-woven filter
The solid waste residue is filtered out: 1. The old liquid is filtered with a non-woven fabric, and the gravity of the liquid is transmitted through the non-woven fabric to separate the sludge and other impurities. 2, can filter out sludge, solid particles. 3, the conditional user can buy a portable oil filter, the old liquid will be filtered twice. 4. The filtered sludge and solid particles are concentrated.
5. Suppose there are 300 kilograms of old liquid. After filtering twice, about 60 kg of particulate matter and sludge can be filtered out.
6. Based on the solid waste treatment specifications, the solid wastes of particulate matter and sludge are loaded with nylon bags and classified as garbage disposal.
Fourth, precipitation agent added (assuming there are 300 kilograms of old liquid)
The remaining 240 kilograms of liquid after filtering in the previous process, 1 by the supplier (for example, mold Germany petrochemical) to the total amount of 2% to 5% sedimentation adsorbent and environmentally friendly activated carbon agent, moderately stirred and precipitated. 2. It can also be used as a light-colored liquid after absorption of sea sand. After moderate agitation, precipitation once, and repeated precipitation of 1,2, it will produce semi-fluid and semi-solid waste, about 60 kg. .
4. After 3-6 months of exposure to semi-fluid and semi-solid waste in open iron drums, about 40 kg of water will be evaporated after air drying to produce about 20 kg of solid waste particles, and then the nylon bag will be installed, according to the classified garbage disposal. Based on solid waste.
V. Dilution and discharge
Finally, the remaining 180 kilograms of liquid is diluted with 10 times tap water, 1900 kilograms. Almost no pollution, the diluted liquid can be discharged directly; it can also be used to recycle the online use of cutting fluids for secondary use, as well as industrial floor cleaning and cleaning of toilet ware.
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