A method for self-adaptive in situ solidification of heavy metals
An in-situ solidification and heavy metal technology, applied in the field of mineral remediation soil, can solve the problems of long repair period, difficult to guarantee the curing effect, lack of heavy metal repair methods, etc.
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Embodiment 1
[0040] Using the molar ratio of Na / Si as a variable, the effects of different molar ratios of Na / Si on the phase and purity of synthetic zeolite were studied. Add NaAlO to montmorillonite raw material 2 , Al(OH) 3 To control the Na / Si molar ratio of the entire formulation system to be 0.2 and the Al / Si molar ratio to be 0.7. Then continue to add NaOH to adjust the molar ratio of Na / Si to 0.2-1.0, and mix well in a mortar to obtain a mixture. Water, which accounts for 80 wt% of the mixture, is added to the mixture, and after being fully stirred, the mixture is put into a high-pressure reaction kettle, and hydrothermally treated at 180° C. for 12 hours. After the hydrothermal reaction was completed, the obtained samples were placed in an oven at 80 °C for 24 h.
[0041] The XRD results of the samples obtained after hydrothermal reaction under different Na / Si molar ratios are as follows figure 1 shown. When the molar ratio of Na / Si = 0.2, beidelite and gibbsite of the same f...
Embodiment 2
[0043] Using the Al / Si molar ratio as a variable, the effects of different Al / Si molar ratios on the phase and purity of the synthesized zeolite were studied. Add NaAlO to montmorillonite raw material 2 , Al(OH) 3 To control the Na / Si molar ratio of the entire formulation system to be 0.6 and the Al / Si molar ratio to be 0.5. Then continue to add Al(OH) 3 The Al / Si molar ratio is adjusted to 0.5-0.8, and the mixture is fully mixed in a mortar to obtain a mixture. Add water accounting for 80 wt% of the mixture to the mixture, stir well, put it into an autoclave, and perform hydrothermal treatment at 180°C for 12h. After the hydrothermal reaction was completed, the obtained samples were placed in an oven at 80 °C for 24 h.
[0044] The XRD results of the samples obtained after hydrothermal reaction under different Al / Si molar ratios are as follows figure 2 shown. When the Al / Si molar ratio=0.5 or 0.6, the Al / Si molar ratio of the formulation system is close to the molar ra...
Embodiment 3
[0046] Using the hydrothermal reaction temperature as a variable, the effects of different temperature conditions on the phase and purity of the synthesized zeolite were studied. Add NaAlO to montmorillonite raw material 2 , Al(OH) 3 In order to control the Na / Si molar ratio of the entire formulation system to be 0.6 and the Al / Si molar ratio to be 0.5, fully mix in a mortar to obtain a mixture. Water, which accounts for 80 wt% of the mixture, is added to the mixture, fully stirred, and then placed in an autoclave, and hydrothermally treated at 120-200° C. for 12 hours. After the hydrothermal reaction was completed, the obtained samples were placed in an oven at 80 °C for 24 h.
[0047] The XRD results of samples obtained at different hydrothermal reaction temperatures are as follows: image 3 shown. When the hydrothermal temperature is 120°C, the quartz phase of the raw montmorillonite disappears, a little unnamed zeolite is formed in the product, and a large amount of mo...
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