Soil remediation agent, preparation method and application in reduction of arsenic pollution
A restoration agent and red mud technology, which is applied in the field of soil restoration agent and preparation, can solve the problems of poor sustainability, high consumption, and fluctuations in the acid-base environment of the restoration agent, and achieve a reduction in the hydrodynamic dispersion coefficient, strong acid-base buffering capacity, The effect of reducing ecotoxicity
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Embodiment 1
[0029] The restoration agent is a homogeneous powder mixture composed of red mud (50% by mass), iron fulvic acid (40% by mass), and sodium iron EDTA (10% by mass) Dissolve I in waste acid from titanium dioxide production (solid-to-liquid ratio: 1:1) to obtain slurry mixture II, and then mix uniformly dry mixture II and phosphogypsum at a mass ratio of 3:1.
[0030] Red mud is the aluminum-containing waste slag produced by the Bayer process of producing alumina, and is processed by the following method: red mud powder with a particle size of less than 75 μm is dried at 105-125 °C until the moisture content is lower than 2.3%.
[0031] Iron oxide content in ferric fulvic acid is 5%.
[0032] Iron oxide content in sodium iron EDTA is 14.7%.
[0033] The slurry mixture II was dissolved with microwave assistance, and then left to stand at room temperature for 18 hours.
[0034] The drying step of the slurry mixture two is: place the slurry mixture two on a fluidized bed, and blow...
Embodiment 2
[0037] The preparation process and curing process of the remediation soil sample are the same as in Example 1, except that the remediation agent dosage is 2% (accounting for the dry weight of the contaminated soil).
Embodiment 3
[0039] The preparation process and curing process of the remediation soil sample are the same as in Example 1, except that the remediation agent dosage is 4% (accounting for the dry weight of the contaminated soil).
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