Soil heavy metal passivator, preparation method thereof and soil remediation method
A heavy metal passivator and soil remediation technology, applied in the field of soil remediation, can solve the problems of high cost and poor passivation effect, and achieve the effect of reducing effectiveness, reducing absorption and continuous adsorption capacity
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[0042] see figure 1 , the preparation method of the soil heavy metal passivation agent of one embodiment, is a kind of preparation method of the soil heavy metal passivation agent of above-mentioned embodiment, comprises the steps:
[0043] Step S110: Roasting oyster shells at 1100° C. to 1200° C., and then crushing to obtain oyster shell powder.
[0044] Wherein, the roasting time is 20 minutes to 60 minutes. Further, the roasting time is 40 minutes to 60 minutes. In actual production, oyster shell powder is roasted in a rotary drying drum. The inclination angle of the rotary drying cylinder is 1.7°~3°, and the rotation speed is 2r / min~5r / min. The oyster shells are dried in the rotary drying drum by gradually heating from 100°C to 1100°C to 1200°C for 20min to 60min. In the rotary drying drum, the oyster shell and the high-temperature airflow adopt reverse flow, that is, the oyster shell is fed at a flow rate of 4.0t / h-6.0t / h at the low-temperature port and discharged at ...
Embodiment 1
[0066] The preparation process of the soil heavy metal passivator of the present embodiment is specifically as follows:
[0067] (1) Preparation of oyster shell powder: add discarded oyster shells from the feeding port of the drying cylinder at a flow rate of 5.5t / h, turn on the drying cylinder and rotate at 5.0r / min, and the oyster shells rotate from the inlet to the outlet, the whole process takes 50min , control the temperature of the feeding port to be 100°C, and the temperature of the discharging port to be 1200°C, and then mechanically pulverize to obtain oyster shell powder.
[0068] (2) In parts by weight, fully mix 80 parts of oyster shell powder with 5 parts of biochemical potassium fulvic acid and 15 parts of fly ash, wherein the mass content of calcium oxide in the oyster shell powder is 65%, and the fly ash The mass content of calcium oxide in the medium is 12%, and the soil heavy metal passivator is obtained.
Embodiment 2
[0070] The preparation process of the soil heavy metal passivator of the present embodiment is specifically as follows:
[0071] (1) Preparation of oyster shell powder: Add discarded oyster shells from the feeding port of the drying cylinder at a flow rate of 5.5t / h, turn on the drying cylinder and rotate at 4.0r / min, and the oyster shells rotate from the inlet to the outlet. The whole process takes 60min. Control the temperature at the feeding port to be 100°C, and the temperature at the discharging port to be 1100°C, and then mechanically pulverize to obtain oyster shell powder.
[0072] (2) In parts by weight, fully mix 78 parts of oyster shell powder with 6 parts of ammoniated humic acid and 20 parts of fly ash, wherein the mass content of calcium oxide in the oyster shell powder is 62%, and in the fly ash The mass content of calcium oxide is 12%, and the soil heavy metal passivator is obtained.
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