Electroplating sludge is the "final state" of wastewater treatment in electroplating industry. It contains a lot of precious metals such as copper, nickel, chromium, iron and zinc.Electroplating sludge mainly comes from solid wastes produced by various electroplating wastes and electrolytic bath liquids treated by liquid phase chemistry in industrial electroplating plants. Due to the different production and treatment processes of electroplating manufacturers, the chemical components of electroplating sludge are quite complex, mainly containing heavy metal compounds such as chromium, iron, nickel, copper, zinc and soluble salts. In the initial treatment of electroplating sludge, plating enterprises need to convert all kinds of heavy metal salts in electroplating waste liquor into corresponding hydroxides and precipitate and solidify them. Therefore, chemical drugs such as reductants, neutralizers and flocculants are added to the treatment of electroplating waste liquor, which leads to the increase of chemical components in electroplating sludge and the dispersal and content of various heavy metal compounds in the components.Low.In particular, some electroplating enterprises use lime or calcium carbide as neutralizer to produce a large amount of gypsum or calcium hydroxide through chemical reactions during neutralization treatment, which increases the total amount of electroplating sludge and decreases the content of heavy metal components, making further harmless treatment, separation and comprehensive utilization more difficult.According to our field investigation, the water content of electroplating sludge produced by new treatment is very high, reaching 75%80%. Compounds of chromium, iron, nickel, copper and zinc are generally about 0.5%-3%(in terms of oxides), gypsum (calcium sulfate) is 8%-10%, and other water-soluble salts and impurities are about 5%. Product details of electroplated sludge paddle dryer Overview of electroplating sludge dryer: Wedge-shaped hollow blades are arranged densely on the hollow axis, and the heat medium flows through the hollow axis.The heat transfer area per unit effective volume is very large. The temperature of heat medium ranges from 40 C to 320 C. It can be either water vapor or liquid type, such as hot water, heat conducting oil, etc.Indirect conduction heating, without carrying air to take away heat, heat is used to heat materials.Heat loss is only heat dissipation to the environment through the insulating layer of the body.Wedge blade heat transfer mask has self-cleaning function.Relative movement of material particles and wedge surface produces scouring effect, which can wash away the attached material on wedge surface and keep the clean heat transfer surface in operation.The shell of the blade dryer is W-shaped, and two or four hollow stirring shafts are generally arranged in the shell.The shell has a sealed end cover and an upper cover to prevent material dust leakage and collect material solvent vapor.A block wrench is arranged at the outlet to ensure the material level height, so that the heat transfer surface is covered by the material and plays a full role.The heat medium passes through the rotary joint and flows through the shell jacket and the hollow stirring shaft. The hollow stirring shaft has different internal structure according to the type of the heat medium, so as to ensure the good heat transfer effect.Application of Electroplating Sludge Dryer: Paddle dryer has been successfully used in chemical, petrochemical, dyestuff, industrial sludge drying, paper making sludge drying, printing and dyeing sludge drying, domestic sludge drying and other fields.The characteristics of heat transfer, cooling and stirring enable the equipment to perform the following unit operations: calcination (low temperature), cooling, drying (solvent recovery), heating (melting), reaction and sterilization.The impeller blade is also the heat transfer surface, which enlarges the heat transfer area per unit effective volume and shortens the treatment time.The heat transfer surface of wedge blade has self-cleaning function.Compressionexpansion stirring function to make materials mix evenly.The material moves in a "piston flow" along the axis. In the axial range, the gradient of temperature, humidity and mixing degree of the material is very small. With heat conducting oil as heat medium, the blade dryer can complete low temperature calcination.Such as: Calcium sulfate dihydrate (Ca2SO4. 2

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