Electroplating electric heating tube chemical precipitation treatment

Electroplating electric heating tube chemical precipitation treatment

The chemical precipitation method combined with the heavy metal ion trapping agent chelation precipitation method is more suitable for the wastewater treatment of electroless nickel plating enterprises, and the operation is easy and simple, the treatment cost is low, and the removal rate of Ni ions and heavy metal ions is high.

The advantages of chemical precipitation treatment of electroless nickel plating waste liquid are that the operation process is simple and the treatment cost is low, but a large amount of waste residue will be generated during the treatment process, which must be properly handled, and attention should be paid to the recovery and comprehensive utilization of waste residue to prevent secondary pollution.

Electroplating electric heating tube DTC treatment of wastewater with low Ni2+ ion content

When chemical precipitation to remove M" ions and other heavy metal ions in the waste liquid cannot meet the discharge requirements, the method of adding dialkyldithiocarbamate (DTC) can be used to remove i2+ and other heavy metal ions. In a wide pH value range (3-10), it forms chelate precipitates with N and other heavy metal ions. DTC and its derivative chelating agents (but chelating resin DTC is a three-dimensional bridging structure and is insoluble) are easy to dissolve. It is soluble in water, has a long-chain linear polymer structure, and contains a large number of polar groups (the sulfur atom in the polar group has a large radius, is negatively charged, and is easily polarized and deformed to generate a negative electric field), which can capture cations and tend to Bonded to generate insoluble aminodithiocarboxylate (TDC), some of the generated TDC salts are ionic bonds or strong polar bonds, most of them are coordination bonds, and the coordination base chelated by the same metal ion It may come from different DTC molecules, so that the molecules of TDC salts generated by heavy metal ions and DTC chelating collectors are highly cross-linked and three-dimensional, and the relative molecular mass of the generated insoluble chelating salts is very large (up to one million or more). Therefore, once this metal salt is formed in wastewater, its solubility is very small, and it has a very good flocculation and sedimentation effect.

Taking advantage of the fact that DTC can rapidly react with various heavy metal ions such as Ni2+, Hg2+, Cd2+, Cu2+, Pb2+, Mn2+, Zn2+, Cr3+ and other heavy metal ions in wastewater at room temperature to form insoluble chelating salts, if a small amount of organic or inorganic salts are added The flocculant can form a flocculent precipitate, so as to achieve the purpose of capturing, adsorbing and removing Ni ions and heavy metal ions. The use of DTC can effectively precipitate M ions and reduce the " ions in the waste liquid to less than 1 × 10.

Although DTC is used to treat electroplating wastewater, although the treatment effect is good, the treatment cost is high when the amount of use is high. Using DTC to treat wastewater with low heavy metal ion content is very effective.

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