Synthesis method of heavy metal chelating agent

Abstract

The invention belongs to the technical field of chelating agents, and in particular relates to a synthesis method of a heavy metal chelating agent. The synthesis method comprises the steps of 1, adding excess carbon disulfide to active polymer aliphatic amine under an alkaline condition to enable active polymer aliphatic amine to react with the excess carbon disulfide so as to obtain an intermediate product, wherein the active polymer aliphatic amine is at average molecular weight of 200,000 to 300,000; 2, adding hydroxide powder to the intermediate product, agitating, and then performing solid-liquid separation to obtain the heavy metal chelating agent. Compared with the prior art, the synthesis method has the advantages that the prepared heavy metal chelating agent with relatively large average molecular weight is added to heavy metal ion containing wastewater to greatly improve the capacity of flocculating settling after reacting with the heavy metal ion, and therefore, the problem of pollution caused by wastewater with relatively low heavy metal concentration can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of chelating agents, in particular to a method for synthesizing heavy metal chelating agents. Background technique [0002] Heavy metal wastewater refers to the wastewater containing heavy metals discharged from industrial production processes such as mining and metallurgy, machinery manufacturing, chemical industry, electronics and instrumentation. Heavy metal (such as cadmium, nickel, mercury, zinc, etc.) wastewater is one of the most serious environmental pollution and one of the most harmful industrial wastewater. Moreover, the heavy metals in wastewater generally cannot be decomposed and destroyed, but can only transfer their existing positions and change their physical and chemical forms. For example, after chemical precipitation treatment, heavy metals in wastewater are transformed from dissolved ionic state into insoluble compounds and precipitated, transferred from water to sludge; after ion exchan...

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Problems solved by technology

[0005] One of purpose of the present invention is: for the deficiencies in the prior art, and provide a kind of synthetic method of heavy metal chelating agent, the heavy metal chelating agent that adopts this method synthesis can improve its flocculation and sedimentation performance after itself reacting with heavy metal ion, thus effectively Solve the pollution problem of wastewater with low concentration of heavy metals