Heavy-metal solidification and stabilization chemical and use method thereof
A technology of heavy metals and pharmaceuticals, applied in the field of environmental protection and soil pollution control, can solve the problems of crop and groundwater safety threats, incomplete industrial waste treatment, technical process substandard, etc., to achieve no secondary pollution risk, solidification and stabilization time Fast and effective treatment
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Embodiment 1
[0041] The Cd-contaminated soil in a metal-contaminated area was selected as the sample for this implementation, and the Cd concentration was 35.7mg / kg. The heavy metal solidifying and stabilizing agent (weight proportion is: Portland cement is 30%, fly ash is 20%, quicklime is 30%, hydroxyapatite is 10%, montmorillonite 10%) and water according to weight The ratio is 1:1, stirring and mixing; according to the proportion that the amount of heavy metal solidification and stabilization agent added is 6% of the sample mass percentage, it is added to the sample, mixed and stirred evenly, and left to stand for curing for 36 hours.
[0042] Samples were dried for analysis and determination. The leachate was obtained from the leaching experiment of the sample by the flipping leaching procedure, and the treated leachate was determined by flame atomic absorption spectrometry ("Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299—2007)).
[0043] Aft...
Embodiment 2
[0045] The Pb-contaminated soil of an industrial site was selected as the sample for this implementation, and the Pb concentration was 458mg / kg. The heavy metal solidifying and stabilizing agent (weight proportion is: Portland cement is 30%, fly ash is 15%, quicklime is 15%, hydroxyapatite is 20%, nano-montmorillonite 20%) and water according to The weight ratio is 1:1, stirring and mixing; according to the proportion that the heavy metal curing and stabilizing agent is 8% by mass of the sample, it is added to the sample, mixed and stirred evenly, and left to stand for 36 hours.
[0046] Samples were dried for analysis and determination. The leachate was obtained from the leaching experiment of the sample by the flipping leaching procedure, and the treated leachate was determined by flame atomic absorption spectrometry ("Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299—2007)).
[0047] After testing, the leaching concentration of heavy ...
Embodiment 3
[0049] The Zn-contaminated soil of an industrial site was selected as the sample for this implementation, and the Zn concentration was 2843.6mg / kg. The heavy metal solidifying and stabilizing agent (weight ratio is: Portland cement is 30%, fly ash is 15%, quicklime is 15%, hydroxyapatite is 30%, nano-montmorillonite 10%) and water according to The weight ratio is 1:1, stirring and mixing; according to the proportion that the heavy metal curing and stabilizing agent is 10% of the mass percentage of the sample, it is added to the sample, mixed and stirred evenly, and left to stand for 36 hours.
[0050] Samples were dried for analysis and determination. The leachate was obtained from the leaching experiment of the sample by the flipping leaching procedure, and the treated leachate was determined by flame atomic absorption spectrometry ("Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299—2007)).
[0051] After testing, the leaching concentra...
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