Method of coproducing modified polyiron from copper extracted PCB acid etching waste liquid
A technology of acidic etching waste liquid and etching waste liquid, which is applied in the direction of chemical instruments and methods, iron compounds, process efficiency improvement, etc., and can solve problems such as high processing costs, secondary pollution safety hazards, etc.
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Embodiment 1
[0046] like figure 1 shown. The copper content is 89.68g / L, the density is 1215kg / m 3 PCB etching waste liquid 20m 3 Import the etching waste liquid into the buffer tank 1, fill the contact reactor 4 with about 1000kg of iron sheets, and then start the acid-resistant ceramic pump 2 to make the PCB etching waste liquid continuously contact with iron, react, precipitate sponge copper, and circulate, and the sponge copper passes through the solid The liquid separator 3 discharges continuously. During the operation process, add iron sheets to the contact reactor 4 every half hour, and pay close attention to the residual copper content of the circulating PCB etching waste liquid. After reacting for 8 to 8.5 hours, if the residual copper content in the waste liquid is less than 0.05g / L, shut down the acid-resistant ceramic pump 2, and use the submersible pump 6 to transfer the residual waste liquid to figure 2 Polymerization reactor 5 is shown. At this time, the total consumpt...
Embodiment 2
[0048] Production method is the same as embodiment 1, and the copper content of PCB acid-base mixed etching waste liquid is 142.5g / L, and density is 1318kg / m 3 Utilize the waste active iron powder replacement of iron content 49.37%, the total consumption of waste active iron powder is 7100kg; Gained sponge copper is through draining, reduction roasting, obtains content and is 93.43% copper cake 3047kg, and the recovery rate of copper reaches 99.89%; %. After fully extracting copper, add 100kg of citric acid to adjust the iron content and acid content of the residual waste liquid. According to the technology of Chinese Invention Patent Publication No. CN1101896A, about 29300kg of modified Polymer iron, its iron content is 178.2g / L, its basicity is 16.98%, and its density is 1490kg / m 3 .
Embodiment 3
[0050] Production method is the same as embodiment 1, and the copper content of PCB etching waste liquid is 116.4g / L, and density is 1293kg / m 3 Utilize reduced iron powder to replace, and the total consumption of iron powder is 2996kg; Gained sponge copper is through draining, reduction roasting, obtains the copper cake 2442kg that content is 95.03%, and the recovery rate of copper reaches 99.69%. After fully extracting copper, add 2000kg of ferric chloride, 12500kg of ferrous sulfate, 6000kg of ferrous chloride and 1500kg of concentrated sulfuric acid to adjust the iron content and acid content. , hydrolysis, polymerization, compound modification and other reactions, about 47,300kg of modified polyiron can be prepared, with an iron content of 238.2g / L, a basicity of 17.91%, and a density of 1653kg / m 3 .
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