Extractant for treating heavy metals in fly ash and method for extracting heavy metals with the extractant
A technology for extracting agents and heavy metals, applied in the field of environmental engineering, can solve the problems of toxic reagents and high cost of removal methods, and achieve the effects of low price, reduced leaching toxicity and high treatment efficiency
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Embodiment 1
[0030] The extractant is prepared by mixing 50% kerosene and 50% P204 by volume evenly.
[0031]After uniformly mixing the above extractant with the fly ash of the municipal solid waste incineration plant according to the liquid-solid mass ratio of 1:1, place it in a stirrer at room temperature and stir continuously for 24 hours, then let it stand for stratification. Heavy metals in fly ash include zinc or lead. Static stratification is divided into upper and lower layers. The unsaturated extractant in the upper layer can be recycled until saturated. The saturated extractant can also be recycled after stripping with hydrochloric acid solution. The heavy metals in it are recovered in the form of a mixture. The leaching concentration of heavy metals in the lower layer of fly ash is lower than the concentration limit of the toxic equivalent of fly ash in the pollution control standard of domestic waste landfill. The leaching toxicity of heavy metals is shown in Table 1. The leach...
Embodiment 2
[0037] The extractant is prepared by mixing 80% kerosene and 20% P204 by volume evenly.
[0038] After uniformly mixing the above extractant with the fly ash of municipal solid waste incineration plant at a liquid-solid mass ratio of 5:1, place it in a stirrer at room temperature and stir continuously for 12 hours, then let it stand and separate into layers. Heavy metals in fly ash include zinc or lead. Static stratification is divided into upper and lower layers. The unsaturated extractant in the upper layer can be recycled until saturated. The saturated extractant can also be recycled after stripping with hydrochloric acid solution. The heavy metals in it are recovered in the form of a mixture. The leaching concentration of heavy metals in the fly ash in the lower layer is lower than the concentration limit of the toxic equivalent of fly ash in the pollution control standard of domestic waste landfill. The leaching toxicity of heavy metals is shown in Table 2. The leaching c...
Embodiment 3
[0043] The extractant is prepared by mixing 65% kerosene and 35% P204 by volume evenly.
[0044] After uniformly mixing the above extractant with the fly ash of municipal solid waste incineration plant at a liquid-solid mass ratio of 3:1, place it in a stirrer at room temperature and continuously stir for 20 hours, then let it stand for stratification. Heavy metals in fly ash include zinc or lead. Static stratification is divided into upper and lower layers. The unsaturated extractant in the upper layer can be recycled until saturated. The saturated extractant can also be recycled after stripping with hydrochloric acid solution. The heavy metals in it are recovered in the form of a mixture. The leaching concentration of heavy metals in the fly ash in the lower layer is lower than the concentration limit of the toxic equivalent of fly ash in the pollution control standard of domestic waste landfill. The leaching toxicity of heavy metals is shown in Table 3. The leaching concent...
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Abstract
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