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Novel synthetic heavy metal chelating agent

A chelating agent and heavy metal ion technology, which is applied in the field of new synthetic heavy metal chelating agents, can solve the problems of large energy consumption, high processing cost, and unsatisfactory fixation effect of heavy metal ions

Inactive Publication Date: 2014-08-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chloride ions have a great influence on the mechanical properties of solidified blocks and the leaching of heavy metal ions in the later stage. Therefore, pretreatment must be carried out during cement solidification treatment, which also increases the requirements for the construction and operation of fly ash disposal sites, resulting in increased costs. This limits the application of the method
The melting and solidification method needs to be carried out at high temperature and consumes a lot of energy. At the same time, because the volatile heavy metal elements such as Pb, Cd, and Zn need to be followed by strict flue gas treatment, the treatment cost is very high, and it is not suitable for use in China at this stage.
The chemical agent immobilization and stabilization method has a simple process and good stabilization effect, and has a good development prospect. The rapid development of this method is the chelating agent heavy metal stabilization agent. The key technology is the curing effect of the chelating agent on heavy metal ions, but heavy metals in fly ash The immobilization effect of ions is not particularly ideal, so there has always been a technical bottleneck

Method used

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  • Novel synthetic heavy metal chelating agent
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  • Novel synthetic heavy metal chelating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Synthesis of sodium polyethyleneiminoxanthate (PEX).

[0033] (1) Weigh 77.5g of 50% PEI aqueous solution (1.02mol), add 110ml of H 2 0 diluted evenly and transferred to a three-neck flask. with 100ml H 2 0 Dissolve 40.82g (1mol) NaOH (wt=98%), then mix with PEI solution, and keep the reaction temperature at 25-34°C.

[0034] (2) While stirring, add 83.6g (1.1mol) CS dropwise 2， The dropwise addition took about 2 hours.

[0035] (3) Then keep the temperature at 26~32℃ and react for 2.5~3.5 hours. An orange-red jelly-like solid is obtained, which is the product.

[0036] (4) Precipitate the obtained product in acetone medium, and dry it in vacuum at 40~45°C to form a film.

Embodiment 2

[0037] Example 2: Synthesis of the agent mercaptoacetylpolyethylene (MAPEI).

[0038] Take a small amount of polyethyleneimine solution in a four-necked flask, then add some catalyst and thioglycolic acid to the flask, and install a thermometer, stirrer, condenser and dropping funnel in the flask at the same time. Add alkaline solution (NaOH) to adjust the pH of the solution to alkaline, and stir and react at room temperature for 11-13 hours. After the reaction is finished, acetone is added to the product, and the product is obtained after filtering, washing and vacuum drying.

Embodiment 3

[0039] Example 3: Curing ability of modified polyene polyamines to Cr ions.

[0040] Take 500mL deionized water, add it to the beaker, and add 788mgCrCl to the beaker at the same time 3 Purple crystals, stirred for about 5 minutes and left to stand, then transferred the solution to a 1000mL volumetric flask, shaken and then stood still, transferred the liquid in the volumetric flask to a 100mL beaker with a 25mL pipette, and then added a little Modified polyene polyamine solid, and kept stirring, after reacting for about 30min, detect the remaining Cr in the aqueous solution 3+ ions, the results show that Cr in the solution 3+ The ion concentration was 21.69 mg / kg. It can be seen that the modified polyene polyamine heavy metal ion chelating agent has a significant effect on Cr 3+ The curing rate of ions is 93.5%.

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Abstract

The invention belongs to the technical field of harmless treatment of municipal solid waste incineration fly ash, and solves the solidification problem of heavy metal ions in fly ash. A method for preparing a novel synthetic heavy metal chelating agent comprises the following steps: mixing a polyethyleneimine water solution with a sodium hydroxide water solution, and dropwise adding carbon disulfide to obtain an orange red jelly-like solid, namely the heavy metal chelating agent. The method is simple in process, low in cost, easy and convenient to operate, wide in application range, low in environmental pollution and suitable for industrialized production.

Description

technical field [0001] The invention belongs to environmental protection, and relates to the treatment of heavy metal ions in fly ash after garbage incineration. Specifically, the invention uses PEI as raw material, and CS 2 React under alkaline conditions to generate a heavy metal ion chelating agent (modified polyene polyamine), and then use the synthesized heavy metal ion chelating agent to fix the heavy metal ions in the fly ash after waste incineration in situ, thereby preventing the fly ash. Heavy metals pollute the soil and the environment. Background technique [0002] With the gradual promotion of the construction of waste incineration treatment plants in our country, the fly ash treatment of the completed waste incineration plants will be a major problem we face. Municipal solid waste incineration fly ash is the part of the material collected by the flue gas dust removal equipment after domestic waste incineration. Its output is related to the type of waste, inci...

Claims

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Application Information

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IPC IPC(8): C08G73/04A62D3/33
Inventor 罗仕忠张坡李浪黄亚军黄先波倪宏志严张艳程郡
Owner SICHUAN UNIV
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