Heavy metal passivator for simultaneous passivation of farmland soil cadmium, lead and zinc and preparation method
A heavy metal passivation agent and heavy metal technology, applied in the field of soil improvement technology and environmental protection, can solve the problems of low cost of chemical in-situ passivation repair technology, reduced activity of heavy metals, immature repair technology, etc., and achieve simple preparation and use Effects of ease of operation, reduced mobility, enhanced passivation effect
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Embodiment 1
[0038] A heavy metal deactivator for passivating cadmium, lead and zinc in farmland soil at the same time, the raw material components and their weight percentages are as follows:
[0039] Weathered coal 24%, calcined powder 28%, pyrite slag 22%, activated carbon 13%, calcium magnesium phosphate fertilizer 13%.
[0040] The weathered coal is natural lignite containing 30-50 wt% of humic acid, and the particle size of the weathered coal is 80-mesh sieve. Calcined powder is calcined powder passed through 80-mesh sieve. The main chemical components in calcined powder are calculated by weight percentage: 20-36% of magnesium carbonate, 20-23% of magnesium sulfate, 21-26% of magnesium oxide, 20-25.5% of calcium oxide, The rest are impurities containing minerals such as iron and manganese, which are products of calcined magnesite. Pyrite slag is pyrite slag powder passed through a 80-mesh sieve. The main chemical components in the pyrite slag are calculated by weight percentage: 55%...
experiment example
[0045] 1, this embodiment adopts indoor cultivation test, under constant temperature and humidity, in the heavy metal polluted soil that Cd, Pb, Zn are main pollutants, add passivating agent the passivating agent product of this invention. The culture vessel used in the test was a 500ml polyethylene plastic basin, and the heavy metal-contaminated soil used was 1kg (calculated as air-dried soil) of the polluted soil around the industrial and mining enterprises in Jinan, Shandong that had passed through a 2mm sieve. The heavy metal soil used in the test is equally divided into five equal parts and bottled, and the passivator product of the invention is added with different contents in each bottle, and the addition amount is 8% wt. 70wt% of the water holding capacity, put it into an incubator, cultivate at a constant temperature of 25°C for 1 month, extract with DTPA extract, and calculate the content of effective heavy metals in the treated soil. The content of available heavy m...
Embodiment 2
[0048] A heavy metal deactivator for passivating cadmium, lead and zinc in farmland soil at the same time, the raw material components and their weight percentages are as follows:
[0049] Weathered coal 20%, calcined powder 30%, pyrite slag 25%, activated carbon 15%, calcium magnesium phosphate fertilizer 10%.
[0050] Preparation method, with embodiment 1.
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