真人做人爱试看一

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          Sludge containing copper realizes reclamation disposal by recycling metal

          Author: Taida machine       Release time:2016-08-23
          Reading guidance:Waste water which contains copper is always produced in electroplating industry and circuit board manufacturing process, the sludge containing copper is in the treatment of these containing copper in t
             Waste water which contains copper is always produced in electroplating industry and circuit board manufacturing process, the sludge containing copper is in the treatment of these containing copper in the process of sewage and sludge containing copper mainly containing chromium, iron, nickel, copper, zinc and other heavy metal compounds and soluble salts. According to relevant statistics, Cu electroplating sludge, Cr, the average content of Zn and Ni is very high, the Cr content reached 55.82g/kg, Cu content for 31.81g/kg. The content of Ni is 22.56g/kg, Zn content 18.84g/kg.
          In the natural environment, heavy metals in sludge has great possibility of dissolution and into the water or soil caused by secondary pollution. Data shows, than mining of copper content in copper sludge containing copper in the copper grade, recovery with metal copper in copper sludge has practical significance. Sludge metal recycling has a resource recycling and pollution reduction double benefit, is development direction of heavy metal sludge treatment.
             The sludge metal recycling technology is more widely used is fire pretreatment and wet smelting, methods are the combination of the two. Pyrometallurgical recycling mainly through high temperature reduction method, separation and purification of valuable metals in the sludge, the general process for sludge after pretreatment stage made by smelting furnace purification, the formation of metal products. Pretreatment: due to the high water content of copper containing electroplating sludge, in order to ensure the temperature of melting furnace, increased permeability to improve the rate of the first bed charge, for sludge drying, through efficient mechanical filter, the water content below 60%, then this part of copper sludge drying treatment, the water containing copper sludge production rate dropped to about 25%. The charge: 25% moisture content of sludge after adding a small amount of lime, pressed into brick shaped material with certain strength and size, as As the furnace smelting furnace. The charge into the smelting furnace, adding coke and slag (quartz, limestone). Coke combustion heat makes the burden and the melting, melt overheating, forming a reducing gas, the reduction of copper and other metal oxides, the output of primary products (crude copper and copper matte). Purification: application of reverberatory furnace or other refining furnace further, the crude copper refining,  production of anode copper. In this process, in addition to copper water outside, other impurities is decomposed at high temperature. The recovery technology of valuable metals hydro-metallurgy technology mainly according to the differences of various kinds of metal properties and selection of treatment of different type, mainly for extraction and separation of ammonia leaching after hydrogen reduction, acid soluble ammonia separation the acid soluble sulfide, separation and so on. Usually, the process is: the sludge by low concentration of leaching solution containing copper, obtained by extraction of copper rich organic phase, by stripping to get high copper containing solution, and finally by Electra-winning, back extraction and Electra-winning . brick field clean washing pH=1.0. Get electricity copper sludge adding sulfuric acid, oxidant, control and solid: water: acid = 1: 4: 1, stirred for 2.5 hours. Leaching to the end, the copper leaching rate is greater than 96%. Gravity filtration, leaching liquid is sent after the road extraction, leaching residue, and evacuation curing system curing treatment, cleaning water is returned to acid leaching. Extract with sulfonated kerosene as carrier, the formation of copper extraction organic phase, the extraction conditions were: pH = 2, the organic phase: water = 1: 1, and the period of extraction with maximum extraction of leaching solution of copper extraction to the end after static layering, with sulfuric acid stripping of copper sulfate solution. The quality of the extract-ant, the extraction rate can reach 99% or more.
             Those heavy metals and metal sludge which are worth recycling can be smelted by pyrogenic process and hydro metallurgy in order to recycle valuable metals. In the process of sludge disposal, making sludge into resources is an very effective way to dispose sludge.
           
           

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          真人做人爱试看一

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