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      Reclamation disposal of sludge in heavy metal industry: recycle sludge containing copper

      Author: Taida machine       Release time:2016-08-24
      Reading guidance:Manufacturing, electroplating, printing and dyeing industry will produce a large number of heavy metal waste water in the production process, at the same time these companies deal with heavy metal wast
          Manufacturing, electroplating, printing and dyeing industry will produce a large number of heavy metal waste water in the production process, at the same time these companies deal with heavy metal waste water, will produce large amounts of sludge containing heavy metals. These heavy metal sludge needs through effective treatment can be discharged into the environment, or will cause water or exceed the standard of heavy metal content in soil, lead to soil the ecological environment problems of complex heavy metals. At the same time, it is a kind of resource, after heavy metal extraction of heavy metals in sewage sludge will achieve its resource utilization. Therefore, technology of reasonable disposal of sludge containing heavy metals has important significance for heavy metal recovery of heavy metals in sludge and prevent the pollution of the environment. This paper mainly introduces the technology process recovery of copper sludge: dry - melting - refining - electrolysis.
      Drying
         Printed circuit board industry, electroplating industry, copper ion content in the wire and cable industry and other heavy metal industrial waste water between tens to hundreds of mg / L, usually by chemical precipitation method or chemical coagulation method for processing, processing generated in the process of precipitation of hydroxides is sludge containing copper, generally as high as 75%-85%. due to the high rate of copper sludge containing water rate of the water, in order to ensure the follow-up process in the combustion furnace temperature, charge air and furnace heat energy utilization, first with copper sludge by rotary kiln drying, the moisture content rate dropped to 30% - 40%.
         The waste gas generated in the drying process after the cloth bag dust remover and water bath dedusting and desulfurizing tower processing by the upper air through a chimney emissions, exhaust soot, sulfur dioxide, the concentration of nitrogen oxide emissions meet < industrial furnace air pollutant emission standards > GB9078-1996 second period of second stage limit requirements.
       Melting
          Add lime to the dried sludge containing copper, and further processing of brick brick is sent to the mechanism of melting furnace smelting furnace by melting and curing two divisions, the top two are respectively provided with a feed inlet, respectively for feeding melting and curing area. The prepared copper sludge brick by melting zone the feeding port is mixed with the furnace, at the same time by mixing limestone, quartz stone and carbon material composition by vulcanization zone feeding port mixing furnace, the furnace side nozzle of oxygen enriched air is blown, the high temperature molten pool sludge containing copper and mixture in the intense agitation in the rapid completion of dehydration, melting, slagging. A series of reduction and sulfidation process, crude copper output, matte and slag smelting furnace heating zone is arranged at one end. And with the graphite electrode, which can be of melt holding, so that the copper matte and slag, better cleaning separation. According to enrichment, crude copper, copper periodically from the ice The outlet to form ingot pouring out.
          Waste gas generated in the process of the melting by the bag filter and double alkali desulfurization tower to deal with upper air through a chimney emissions. Exhaust soot, sulfur dioxide, nitrogen oxides, lead and its compounds, arsenic, nickel and its compounds, chromium, tin, antimony, copper, concentrations of manganese and its compounds emissions are full foot  hazardous waste incineration pollution control standard (GB18484-2001) maximum emission concentration limits.
      Refining
         Smelting process of casting block into the rotary refining furnace further refined copper anode, this process is to produce copper surface is flat, fine wrinkles clean cross-section was rose red, bright star uniform distribution, the taste of copper can be reached more than 99%.
         Produce exhaust after bag filter and double alkali desulfurization tower by the chimney of high-altitude emissions, exhaust soot, sulfur dioxide, nitrogen oxides, lead and its compounds, arsenic, nickel and its compounds, chromium, tin, antimony, copper, concentrations of manganese and its compounds emissions are in line with  dangerous waste incineration pollution control standard (GB18484-2001) maximum emission concentration limits.
      Electroanalysis
          Meet can be obtained after further refining process of copper anode still contains a variety of impurities (such as zinc, iron, nickel, silver, gold, etc.), and therefore requires the use of electrolysis refining. The anode copper plate is loaded into the anode washing tank, the water after washing as anode, titanium plate as cathode to sulfate and copper sulfate mixed liquid electrolyte. Electricity, copper from the anodic dissolution of copper ions to the cathode moves to reach the cathode electron in titanium plate precipitation, the process of copper copper containing up to 99.95%, the conductivity of electrical industry. And the process of black copper residue is into the rotary refining furnace refining, these wastes into pure copper.
          Dry - melting - refining - electrolysis treatment technology in Guangdong province has been put into practice, and achieved good economic and environmental benefits. At the same time, Guangdong Province as China's economic and industrial province, there is a high demand for the metal materials, and the current related raw material supply and market demand still exists a certain gap. Therefore, the reasonable metal waste recycling and expand the sources of supply of new metal is very important. At present, with the country to promote energy-saving emission reduction work to strengthen the environmental protection and enterprise, some water factories started construction of sewage treatment plants, with the problem of industrial sludge, have for sludge treatment professional company to solve. Zhengzhou Taida energy-saving drying equipment Technology Co., Ltd. is a professional, the company has a number of paper sludge sludge, printing and dyeing industry Cheng case, is a relatively rich experience in the treatment of sludge processing enterprises.
       
       
       

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