Reading guidance：Stainless steel and electroplating sludge contains much harmful heavy metals. Without proper disposal, these harmful matters will cause secondary pollution and threaten human health. With reclamation d

     Stainless steel and electroplating sludge contains much harmful heavy metals. Without proper disposal, these harmful matters will cause secondary pollution and threaten human health. With reclamation disposal methods, not only can eliminate these the harm caused by these matters, but also can bring some economic benefits. At present, thesethree main ways of sludge disposal of industrial safety in Ningbo City: nickel, copper, zinc heavy metal sludge with high content of ethylene to Ningbo metal factory, by chemical extraction of gold; the Ningbo third disposal station, the stabilizer and cement stabilized / solidified landfill on the sludge; there is no use of heavy metal sludge value to Ningbo a cement plant, high temperature disposal by cement rotary kiln, the sludge containing chromium, nickel and other heavy metals and mineral composition of clinker new mineral phase structure, can make Industrial sludge disposal has been thoroughly. By 2006 in Ningbo City Environmental Protection Bureau of Ningbo City 17 electroplating industry and stainless steel industry enterprises to do statistics show, monthly amount of sludge produced for 1400 tons (to the sludge water rate for 80% of the total) annually produce sludge 4 million tons.
      Specification for safety of sludge disposal is one of the important factor related to city environmental management and environmental safety. At present, some parts of the country are still fire smelting of heavy metal sludge disposal, high energy consumption, high pollution, low output characteristics, production of emissions of toxic gases and dust and heavy metal smelting waste disposal is not standardized, the existence of environmental pollution a serious problem. The technology of advanced technology and equipment, reduce pollution, improve resource utilization efficiency is the best way for sludge disposal. With the increasingly severe situation of sludge disposal, sludge disposal is safe and reliable, effective construction in order to protect the environment. At present, the heavy metal sludge treatment mainly adopts three ways which are chemical extraction method, landfill and the cement rotary kiln in Ningbo.
     Ningbo currently adopts cement rotary kiln calcination technology and special heavy metal sludge incinerator. Compared with special burning furnace, it holds advantages of construction investment, low operation cost, good economic benefit and harmless treatment which existing methods of waste disposal can not come up with. Ningbo city ranks first in the type and scale of domestic disposal. Cement plant using industrial solid waste instead of clinker, reduce limestone, coal consumption, coal consumption can be reduced by about 35 thousand tons, to reduce sulfur dioxide emissions of about 10%, can really waste "reduction, harmless, resources, stability", establish a green corporate image. Ningbo ethylene plant using metal disposal perfect technology and advanced pollution control facilities, reasonably reduce pollution two electroplating sludge to the environment, and effectively meet the national recycling of resources, comprehensive utilization of resources and recycling economy Industrial policy. In Ningbo, have been explored in the technical route of a heavy metal sludge disposal norms, effectively solve the disposal problem of Ningbo industrial sludge. Ningbo industrial waste treatment disposal level gets to a new stage which holds great significance for improving Ningbo’s ecological construction and pollution control level.
 

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