A kind of preparation and application method of soil heavy metal passivator with low secondary environmental risk
A heavy metal passivator, environmental risk technology, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve problems such as secondary pollution, to ensure stability, reduce pollutant release, reduce Effects of Environmental Risk
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Embodiment 1
[0027] The first step is to crush the straw (in this example, corn straw is used, because it is relatively soft and the humification process is relatively quick; but in fact, wheat straw, rice straw, sorghum straw, etc. are all available, and there is no specific requirement) crushed, passing 0.3 mm sieve, then mixed with a stalk-to-water ratio of 1g:50mL, left to humify, and then pulled out to obtain humified straw for later use; another crushed straw passed through a 0.3mm sieve to obtain crushed straw with uniform particle size ; The fly ash is directly crushed and passed through a 0.1mm sieve to obtain fly ash powder with uniform particle size.
[0028] In the second step, the sampled loess (non-polluted loess) is passed through a 0.05mm sieve, and according to the mass ratio of loess:NaCl aqueous solution of 1:2, the uniform particle loess of the sieve is added in the NaCl aqueous solution (0.1mol / L), wetted And leave standstill 4h, obtain mixed solution; According to mas...
Embodiment 2
[0035] The first step is to crush the stalks (corn stalks), pass them through a 0.3mm sieve, then mix them at a ratio of 1g:50mL of stalks to water, let them stand for humification, and then remove them to obtain humified straws, which are set aside; Pass the straw through a 0.3mm sieve to obtain crushed straw with uniform particle size; directly crush the fly ash and pass through a 0.1mm sieve to obtain fly ash powder with uniform particle size;
[0036] In the second step, the sampled loess (non-polluted loess) is passed through a 0.05mm sieve, and according to the mass ratio of loess:NaCl aqueous solution of 1:2, the uniform particle loess of the sieve is added in the NaCl aqueous solution (0.1mol / L), wetted And leave it alone for 4h to obtain a mixed solution; according to the mass ratio of loess: pure water=1:10, add pure water to the mixed solution to obtain a mixture, which is then dispersed in an ultrasonic instrument, and the ultrasonic conditions are: power 75w, time ...
Embodiment 3
[0043] The first step is to crush the stalks (corn stalks), pass them through a 0.3mm sieve, then mix them at a ratio of 1g:50mL of stalks to water, let them stand for humification, and then remove them to obtain humified straws, which are set aside; Pass the straw through a 0.3mm sieve to obtain crushed straw with uniform particle size; directly crush the fly ash and pass through a 0.1mm sieve to obtain fly ash powder with uniform particle size;
[0044] In the second step, the sampled loess (non-polluted loess) is passed through a 0.05mm sieve, and according to the mass ratio of loess:NaCl aqueous solution of 1:2, the uniform particle loess of the sieve is added in the NaCl aqueous solution (0.1mol / L), wetted And leave standstill 4h, get mixed solution; According to mass ratio loess: pure water=1:10, add pure water in mixed solution, obtain mixture, put in ultrasonic instrument and disperse again, ultrasonic condition is: power 50w, time 20min, temperature room temperature. ...
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