An adsorbent for removing dioxins from waste incineration waste gas, its preparation method and its application
A waste incineration and dioxin technology, applied in the direction of separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of high price, complexity, secondary pollution follow-up treatment of activated carbon, etc., and achieve good industrial application prospects, Prepare simple effects
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Embodiment 1
[0019] Weigh 4000.0g of attapulgite clay with a particle size of 3mm to 5mm, add 400.0g of 90% sulfuric acid aqueous solution, and activate it at a reaction temperature of 60°C for 20 hours. Roast at high temperature for 2.5 hours to remove crystal water, add 210.5g of diatomaceous earth to the attapulgite clay for removing crystal water, and mix in a high-speed mixer for 30 minutes to obtain an attapulgite that efficiently removes dioxins from waste incineration waste gas Clay composite adsorbent A. Put the prepared attapulgite clay composite adsorbent A into a fixed-bed reactor, control the reaction temperature at 105°C, and set the gas hourly space velocity at 3000h -1 The ratio of dioxin concentration is 6.3ngTEQ / nm 3 waste incineration flue gas, the concentration of dioxin in the flue gas after adsorption is 0.3ngTEQ / nm 3 .
Embodiment 2
[0021] Weigh 4000.0g of attapulgite clay with a particle size of 3mm to 5mm, add 1600.0g of 30% sulfuric acid aqueous solution, and activate it at a reaction temperature of 100°C for 10 hours. Roast at high temperature for 5.0 hours to remove crystal water, add 1000.0g of diatomaceous earth to the attapulgite clay for removing crystal water, and mix in a high-speed mixer for 10 minutes to obtain an attapulgite that efficiently removes dioxins from waste incineration waste gas Clay composite adsorbent B. The prepared attapulgite clay composite adsorbent B was loaded into a fixed bed reactor, the reaction temperature was controlled at 145 °C, and the gas hourly space velocity was 6000 h -1 The ratio of dioxin concentration is 2.1ngTEQ / nm 3 waste incineration flue gas, the concentration of dioxin in the flue gas after adsorption is 0.2ngTEQ / nm 3 .
Embodiment 3
[0023] Weigh 4000.0g of attapulgite clay with a particle size of 3mm to 5mm, add 1600.0g of sulfuric acid aqueous solution with a concentration of 60%, and activate it at a reaction temperature of 120°C for 4 hours. Roasting at high temperature for 0.5 hours to remove crystal water, add 210.5g of diatomaceous earth to the attapulgite clay for removal of crystal water, and mix in a high-speed mixer for 30 minutes to obtain an attapulgite that efficiently removes dioxins from waste incineration waste gas Clay composite adsorbent C. The prepared attapulgite clay composite adsorbent C was loaded into a fixed bed reactor, the reaction temperature was controlled at 105°C, and the gas hourly space velocity was 3000h -1 The ratio of dioxin concentration is 6.3ngTEQ / nm 3 waste incineration flue gas, the concentration of dioxin in the flue gas after adsorption is 0.3ngTEQ / nm 3 ; The reaction temperature is controlled at 210°C, other conditions remain unchanged, and the concentration o...
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