Comprehensive recovery method of electroplating sludge ferrite solidification
A technology of electroplating sludge and recovery method, applied in ferrous oxides, chemical instruments and methods, iron oxide/iron hydroxide and other directions, can solve the problems of high energy consumption, harsh equipment requirements, high cost, and achieve benefits High, simple processing method, reasonable effect
Active Publication Date: 2017-04-12
TIANJIN ENVIRONMENTAL PROTECTION TECHNICAL DEV CENT DESIGNING INST
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(This method uses oxalic acid dihydrate, which has a high cost; adopts drying and high-temperature calcination technology, which has strict requirements on equipment and high energy consumption; ultimately leads to high investment and processing costs
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[0018] see attached figure 1 ,
[0019] A method for comprehensive recovery of electroplating sludge ferrite solidification, the specific steps are as follows:
[0020] 1) Chemical mud acid leaching: According to the percentage by weight, after the electroplating sludge is unloaded, put it into a conditioning tank, add tap water and stir evenly, add clean water to dissolve and dilute the electroplating sludge to a mixed solution with a concentration of 10%, and use a dosing pump to Add 30% dilute sulfuric acid to the tempering tank to adjust the pH value to 4.0-4.5, so that Fe3+ and Fe2+ can be converted into FeSO 4 and Fe 2 (SO 4 ) 3 ; Nickel, zinc ions and other ions are also correspondingly leached and converted into sulfate; at the same time, Ca2+ and Mg2+ in the solution and sulfate radicals generate calcium sulfate and magnesium sulfate with low solubility, and most of the calcium sulfate and magnesium sulfate precipitate at the bottom In the sludge, it can be remov...
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The invention relates to a solidifying comprehensive recovery method of electroplating sludge ferrite. The sludge is heated, so that sticky organic matters in the sludge can be hydrolyzed at a continuously constant temperature of 80 DEG and under the weak alkaline condition of pH 9.2, and then the colloid structure of the sludge can be broken and the dewaterability of the sludge can be improved; the solidifying comprehensive recovery method comprises the specific steps of sludge melting and acid pickling, sludge-water separation, regulating the pH value to 9.2 and stirring evenly, stirring at the speed of 45r / min and heating, when the temperature of the mixed solution reaches 80 DEG C, heating at the constant temperature of 80 DEG C for 2 hours without stirring, generating magnetic black Fe3O4 crystals in the solution at last, separating the Fe3O4 crystals in the solution by use of a magnetic separator, and obtaining the Fe3O4 crystal relatively high in purity after separation. The solidifying comprehensive recovery method of the electroplating sludge ferrite has the beneficial effect that the ferrite solidified product has the characteristics of stable solidification, magnetism, further productization and the like.
Description
technical field [0001] The invention belongs to the recycling of electroplating sludge, in particular to a method for comprehensive recycling of electroplating sludge ferrite solidification. Background technique [0002] Electroplating sludge is heavy metal-containing sludge waste generated after wastewater treatment in the electroplating industry. It is included in the seventeenth category of hazardous waste in the national hazardous waste list because of its high mass fraction of heavy metals. The research on the disposal method and resource utilization technology of electroplating sludge has become one of the urgent problems to be solved in the environmental protection work in our country. At present, the most simple and effective method to treat electroplating wastewater by chemical precipitation is adopted by most electroplating factories. According to the different treatment methods of electroplating wastewater, electroplating sludge can be divided into two categories...
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IPC IPC(8): H01F1/34C04B35/26C01G49/08C02F11/00
Inventor 孙怡超张泽生冯辉王志远王森玮丁晔苏志龙
Owner TIANJIN ENVIRONMENTAL PROTECTION TECHNICAL DEV CENT DESIGNING INST