Cleaner Production Study On The Electroplating

Plating played an important role in the modern industry. But much acid, alkali and heavy metal solution was used in the plating process, especially cadmium, cyanide, chromic acid and other noxious chemicals. Exhaust gas, waste water and waste residue was released endangering environment and health in the production. So plating is one of the heavy polluting industries. Final treatment can't thoroughly eliminate pollution and bring heavy economic pressure. In order to control pollution, people must change their conception to find a new route. Cleaner production is a creative idea, which made the pollution prevention environmental strategy used in the production, product and service continuously, increased zoology efficiency, and decreased the environmental risk. So cleaner production is imperative under the situation in the plating. The final aim is to achieve the zero emission of the waste water, rise the utilizing rate of source, and combine cleaner production and TPM integrally.In this paper cleaner production on the plating was researched in the tool plant of Shan dong Jiu xin. The content of this research included three aspects: cleaner production technics on the plating, cleaner production audit, the combination of cleaner production and TPM. By the research of these aspects, plating corporations can absorb the experience and learn each other, which can improve the condition of plating cleaner production.First this paper studied the cleaner technics. All the research of the technics was carried out in the tool plant. In the process of research, two quiescent troughs of reusing rinse were added after the nickel plating trough and insulative lacquer was painted on the device used for hanging tools every shift. By the validation of nickel testing, the utilizing rate of nickel rised from 70% to 87%. Three quiescent troughs of reusing rinse were added after the chromium plating trough, thulium additive was used in the decorative chromium plating, the concentration of chromic acid is 150-180g/L, and F-53 was added for restraining the chromium fog. By the validation of chromium testing, the utilizing rate of chromium rised from 15% to 43%. Considering the request of using water in every workshop of tool plant, by adjusting the plating liquid waste in reason in the whole plant, the plating liquid waste was vaporized and achieved the zero emission, which provided a new route of developing plating cleaner production. The nickel residue separating out on the device used for hanging tools was reclaimed and reused as the material of the nickel plating by the way of electrolysis. The rate of reclaiming reached 92.86%. The waste residue from the chemical sedimentation of waste water was used for making bricks. This method is mature technically and can solve the pollution of waste residue.In 2005, the tool plant developed cleaner production audit under the instructions of the expert of Shandong University. The audit passed the checking of the province environmental protection bureau and gained the certificate of A grade. This paper analyzed and summed up the measures of cleaner production. The plant proposed 21 measures in which 18 measures were carried out. The measures contained 8 free and low cost ones which earned 100000 yuan annually and improved the management remarkably, and 10 high cost ones which earned more than 200000 yuan annually. All the measures can earn more than 300000 yuan and save water of 5330 m~3 annually. Every parameter of the unit product was remarkably improved.The plant also developed TPM when developing cleaner production. This paper researched the combination of cleaner production and TPM from two aspects of theory and practice. They had some common grounds in the process of birth, aims and connotations. They had the possibility of combination in the theory and can combine from every aspects in the process of developing TPM. In the practice, the plant can educate the staff using the way of 7 steps belonging to TPM, develop cleaner production using the way of small groups, finish the sustaining plan of cleaner production audit this time, and establish steady ground for cleaner production audit next time. Adding the requests of cleaner production to the proposal of TPM measures, when gathering the TPM measures, cleaner production measures were also obtained.