Extractant for treating heavy metals in fly ash and method for extracting heavy metals with the extractant
An extraction agent and heavy metal technology, applied in the field of environmental engineering, can solve the problems of high cost of removal methods, toxic reagents, etc., and achieve the effects of reduced leaching toxicity, low price, and high treatment efficiency
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Embodiment 1
[0030] The kerosene with a volume percentage of 50% and P204 with a volume percentage of 50% are uniformly mixed to prepare the extractant.
[0031] After the above-mentioned extractant and the fly ash of the municipal solid waste incineration plant are uniformly mixed according to a liquid-solid mass ratio of 1:1, they are placed in a mixer at room temperature for continuous stirring for 24 hours, and then they are allowed to stand for layering. The heavy metals in fly ash include zinc or lead. The standing layer is divided into upper and lower layers. The upper unsaturated extractant can be recycled to saturation. The saturated extractant can also be recycled after stripping with hydrochloric acid solution, and the heavy metals in it can be recovered as a mixture. The leaching concentration of heavy metals in the lower fly ash is lower than the concentration limit for the toxic equivalent of fly ash in the pollution control standard of the domestic waste landfill. The leaching ...
Embodiment 2
[0037] 80% of kerosene by volume and 20% of P204 by volume are uniformly mixed to prepare the extractant.
[0038] After the above-mentioned extractant and the fly ash of the municipal solid waste incineration plant are uniformly mixed according to a liquid-solid mass ratio of 5:1, they are placed in a stirrer at room temperature for continuous stirring for 12 hours, and then left to stand for layering. The heavy metals in fly ash include zinc or lead. The standing layer is divided into upper and lower layers. The upper unsaturated extractant can be recycled to saturation. The saturated extractant can also be recycled after stripping with hydrochloric acid solution, and the heavy metals in it can be recovered as a mixture. The leaching concentration of heavy metals in the lower fly ash is lower than the concentration limit for the toxic equivalent of fly ash in the pollution control standard for domestic waste landfills. The leaching toxicity of heavy metals is shown in Table 2. ...
Embodiment 3
[0043] The extractant is prepared by mixing kerosene with a volume percentage of 65% and P204 with a volume percentage of 35%.
[0044] After the above-mentioned extractant and the fly ash of the municipal solid waste incineration plant are uniformly mixed according to a liquid-solid mass ratio of 3:1, they are placed in a stirrer at room temperature for continuous stirring for 20 hours, and then left to stand for layering. The heavy metals in fly ash include zinc or lead. The standing layer is divided into upper and lower layers. The upper unsaturated extractant can be recycled to saturation. The saturated extractant can also be recycled after stripping with hydrochloric acid solution, and the heavy metals in it can be recovered as a mixture. The leaching concentration of heavy metals in the lower fly ash is lower than the concentration limit for the toxic equivalent of fly ash in the pollution control standard for domestic waste landfills. The leaching toxicity of heavy metals ...
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