Heavy metal chelating agent and preparation method thereof

Abstract

The invention discloses a heavy metal chelating agent and a preparation method thereof. The heavy metal chelating agent is prepared from the following components in parts by weight: 35 to 40 parts of a dithiocarbamic acid compound, 0.8 to 1.2 parts of a penetrant, 1.0 to 1.5 parts of a polyoxyethylene surfactant, 4.0 to 5.0 parts of trisodium citrate dihydrate, 3.5 to 4.5 parts of ethylene diamine tetraacetic acid and 25 to 35 parts of soft water. The heavy metal chelating agent can remove trace heavy metals in dust.

Description

technical field [0001] The invention relates to the field of metal chelating agents, in particular to a heavy metal chelating agent and a preparation method thereof. Background technique [0002] Heavy metal pollution refers to the environmental pollution caused by elements with significant biological toxicity such as Hg, Cd, Pb, Cr, and As, and general heavy metals with certain toxicity, such as Zn, Cu, Co, Ni, S, and their compounds. Heavy metals are difficult to degrade and can remain in the environment for a long time. They are easy to enrich and poison animals, plants and human body through the food chain system. A variety of heavy metals in dust such as: lead, chromium, copper, zinc, nickel, etc. mainly come from industrial pollution, traffic pollution and construction dust, etc., not only can enter animals and plants through soft water, atmosphere, soil and other media and affect the ecosystem and environment It is safe and can also enter the human body through inges...

AI Technical Summary

Problems solved by technology

[0003] At present, there are three main treatment methods for heavy metal components in fly ash. One is to use soft cement solidification technology to solidify heavy metals. The soft hydrated silicate colloid C-H-S of soft cement forms relatively stable compounds such as hydroxides or complexes on the surface, but this method has the disadvantages of increasing the capacity of fly ash and increasing the volume of landfills; the second is melting and solidification This method is currently recognized as the safest and most stable incineration fly ash stabilization / solidification technology. This method is mainly to mix incineration fly ash and glassy powder to form granules, and melt them at a high temperature of 1000-1400 °C for a period of time. , but this method has the disadvantage of high energy consumption; the third is the chelating agent stabilization method, the chelating agent removes the heavy metal from the dust by coordinating with the heavy metal and dissolves it in soft water, thereby removing the heavy metal in the dust

Most of the chelating agents used at this stage are DTC chelating agents (dithiocarbamate referred to as DTC). Dithiocarbamate has a reduced chelating ability in an alkaline environment and cannot effectively remove trace amounts of heavy metals in dust.

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