Recently, countries increasingly high demands of environmental protection, more and more strict. In the establishment of the State Environmental Protection Inspectorate and determination rectification, the coast, the Pearl River Delta and Yangtze River Delta as the representative, thousands of water, gas, electroplating, printing and dyeing, metal processing factory, manufacturing or move or collapse, forcing companies to upgrade the transformation.
As early as 1998, the State Environmental Protection Administration, the State Economic and Trade Commission, the Ministry of foreign trade and the Ministry of public security under the “People’s Republic of China solid waste pollution prevention and control law”, making “the national hazardous waste list”, which clearly stipulates the waste liquid soap, emulsified oil / water, hydrocarbon and water mixture, emulsion paste cutting agent as dangerous so the old waste cutting fluid cutting liquid emulsified oil, must go through professional guidance, counseling treatment before discharge.
I am engaged in wire cutting EDM environmental protection industry for more than 20 years, with the European Union, Japan and foreign enterprises, experience in environmental protection requirements throughout the industrial zone, is fast, relevant experience in go treatment and discharge of the liquid silk machine old share to everyone, hope that business owners in the process of creating wealth value, reduce the blind process to undertake the social responsibility, and avoid detours, fines from shutting down.
- selection of processing fluid
Must first select the real green water line cutting fluid. The processing liquid green really must not contain sodium nitrite, potassium nitrite silver, six chromium, heavy metals and other harmful substances and pollution sources. The majority of the market “water” cutting fluid is a semi synthetic soluble oil, containing a large number of non-standard mineral oil, this is not the real green liquid processing.
We must do it in actual processing and production:
1) regulate the use of strict water change to add;
2) to create conditions for centralized liquid supply, old liquid uniform attire; centralized liquid supply can improve the utilization of liquid and processing efficiency, keep the working fluid processing stability, and maintain good cooling and chip removal effect
3) concentration management;
4) take care of it regularly and check the three wastes after dilution
- cleaning of machine tool cycle system
We are in the processing of the production practice, the old solution contains a large amount of molybdenum, iron, carbon, sludge and other mixed metal powder and impurities and dead and water tank pipeline, more public attention WeChat CNC programming knowledge (NC programming teaching) receive tutorial, valve filter screen inside also accumulated some metal powder and therefore debris. The fluid replacement, to water table and pipeline thoroughly, fully cleaning, two time interval of 30 minutes (the time interval is a sterilization time time of 10 minutes each), there are requirements for cleaning.
1) you can add clean detergent with water and turn on the water pump for 0.5 hours
2) with industrial cleaning agent 5%, “machine tool recycling system, fungicide 0.2%” dissolved in 100% of the water, winter heating is not less than 60 degrees of water cleaning, turn on the water pump for 0.5 hours, wash two times
- non-woven filtration
Filter out solid waste residue:
1) the old liquid is filtered by non-woven fabric, and the impurity of oil sludge is separated by the gravity of the liquid through the non-woven fabric
2) it can filter out oil sludge and solid particles
3) a conditioned user can buy a portable oil filter and filter the old liquid two times
4) filter sludge, solid particles concentrated in full bloom
5) assuming 300 kg of old liquid, it can filter out about 60 kilograms of particulates and sludge after two filtration
6) according to treatment standard of solid waste, solid waste and sludge particles, packed nylon bags, garbage treatment.
- add precipitant precipitation
Assuming 300 kg of old liquid, the remaining 240 kg of liquid is filtered in the previous process:
1) by suppliers (such as mold petrochemical) to add the total amount of 2%~5% settlement adsorbent and environmental protection activated carbon agent, moderate mixing precipitation
2) can also be used for sand adsorption, adsorbent into light liquid;
3) moderate mixing, precipitation once, precipitation, repeated 1,2, after treatment once, will produce semi fluid, semi solid waste, about 60 kg
4) exposure drum placed “semi fluid, semi solid waste” in 3-6 months, about 40 kilograms of water to dry after evaporation, produced solid waste particles about 20 kilograms, and then installed a nylon bag, according to the classification of garbage disposal, on the basis of solid waste.
- dilution and discharge
Finally, the remaining 180 kg now liquid, adding 10 times of tap water or 1900 kg dilution. Almost no pollution, the diluted liquid can be discharged directly; also can be used for online circulation cutting two times liquid processing, can also be industrial floor washing, cleaning the toilet ware.
Author: Zhao Xiaojun, member of China Mould Industry Association; Chinese special processing EDM branch experts members; Ningbo City Vice Chairman of the Shaanxi chamber of Commerce, city director of machine tool association, the International Association of Shanghai lubricating oil lubrication equipment, expert member of Zhejiang Mould Association; Petrochemical Co., general manager of the company.