Preparation method of heavy metal contaminated soil treatment agent

[0028] Example 1

[0029] A preparation method of a heavy metal polluted soil treatment agent, and its specific preparation scheme is as follows:

[0030] After crushing 50kg of chitin, mix it with 150kg of modified sludge-based adsorbent and 300kg of hydrochloric acid with a mass percentage concentration of 10%, then add 16kg of coconut shell chips, 18kg of Dunaliella, and 30kg of sawdust to control the mixture. temperature at 80°C, stirring for 5h, filtering, washing with water to PH=7, drying at 105°C for 5h, adding to the extruder, extruding into granules, drying at 155°C for 2h, and then the one described above can be obtained. Heavy metal contaminated soil treatment chemicals.

[0031] The extruder is a single screw extruder.

[0032] Described a kind of modified sludge-based adsorbent, its preparation method is as follows:

[0033] Add 10kg of straw powder to 5kg of zinc chloride and 100kg of hydrochloric acid with a concentration of 10% by mass, stir for 5h, filter, wa

[0036] Example 2

[0037] A preparation method of a heavy metal polluted soil treatment agent, and its specific preparation scheme is as follows:

[0038] After pulverizing 76kg of chitin, mix it with 220kg of modified sludge-based adsorbent and 380kg of hydrochloric acid with a mass percentage concentration of 16%, then add 18kg of coconut shell chips, 23kg of Dunaliella, and 38kg of sawdust to control the mixture. The temperature is 82°C, stirred for 7h, filtered, washed with water to PH=7, dried at 108°C for 7h, added to the extruder, extruded into granules, dried at 166°C for 3h, and the one described above can be obtained. Heavy metal contaminated soil treatment chemicals.

[0039] The extruder is a twin-screw extruder.

[0040] Described a kind of modified sludge-based adsorbent, its preparation method is as follows:

[0041] Add 35kg of straw powder to 7kg of zinc chloride and 170kg of hydrochloric acid with a mass percentage concentration of 12%, stir for 8h, filter, w

[0044] Example 3

[0045] A preparation method of a heavy metal polluted soil treatment agent, and its specific preparation scheme is as follows:

[0046] After crushing 120kg of chitin, mix it with 300kg of modified sludge-based adsorbent and 500kg of hydrochloric acid with a mass percentage concentration of 20%, then add 24kg of coconut shell chips, 42kg of Dunaliella, and 50kg of sawdust to control the mixture. temperature at 90°C, stirring for 10h, filtering, washing with water to PH=7, drying at 110°C for 10h, adding to the extruder, extruding into granules, drying at 180°C for 5h, and then the one described above can be obtained. Heavy metal contaminated soil treatment chemicals.

[0047] The extruder is a three-screw extruder.

[0048] Described a kind of modified sludge-based adsorbent, its preparation method is as follows:

[0049] Add 80kg of straw powder to 15kg of zinc chloride and 300kg of hydrochloric acid with a mass percentage concentration of 20%, stir for 10h