Passivator for treating Cd/Pb-polluted soil and polluted soil in-situ restoration method by using passivator
A technology of polluted soil and passivating agent is applied in the field of remediation of heavy metal polluted soil, which can solve the problems of complex process and high production cost, and achieve the effects of simple components, simple operation and reduced mobility.
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[0021] The passivating agent used in the treatment of Cd and Pb contaminated soil includes three materials: biochar, red mud and monoammonium phosphate;
[0022] Biochar is prepared by 3:1 parts by weight of corn stover powder and wheat straw powder with a particle size of less than 1mm, which are pyrolyzed and carbonized under anoxic conditions at 350°C, and stored for use after measuring and packaging;
[0023] Red mud is the raw material of red mud (the tailings produced by aluminum smelting in aluminum plants). It is washed with an aqueous solution of pH=5 in the ratio of phosphoric acid and nitric acid at a ratio of 1:1 to pH=10, then air-dried naturally, and then ground into nanometers by a ball mill Grade powder, stored for later use after measuring and packaging, among which Fe in the finished red mud powder 2 O 3 The content is 8.3%, Al 2 O 3 The content is 5.8%;
[0024] Monoammonium phosphate is a commercially available chemical agent, white crystal, also known as ammoniu...
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