Sludge-based adsorbent used for desulfurization and demercuration of flue-gas and preparation method thereof

An adsorbent and sludge technology, which is applied in the field of sludge-based adsorbent for flue gas desulfurization and mercury removal and its preparation, can solve the problems of adding additives, etc., and achieves improved porosity, simple process, shortened treatment and disposal, and resource utilization. The effect of the process

Active Publication Date: 2012-10-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This patented technology allows create strong bacteria that help break down harmful substances into smaller pieces more easily than before they were released during manufacturing processes or disposal methods like landfills. It also increases the amount of certain metals found within it through activation and chemical reactions between them. These modifications make this product effective at removing pollutants such as sulfur dioxide (SO2) gases, nitrogen oxides (NO) emissions, heavy metal elements, lead compounds, hydrocarbons, polychlorinated biphenyls, pesticids, tars, volatile organic solvents, cyanogen chlorine), pharmaceutically active ingredients, carcinogens, and other hazardous materials.

Problems solved by technology

This patented technical problem addressed in this patent relates to improving the efficiency and effectiveness of treatments involving sludges containing high amounts of harmful contaminants like heavy metals while also addressing environmental concerns related issues associated with these compounds. Specifically, there exist challengings when developing effective techniques to reduce their volume without compromising on its ability to dispose of them safely due to potential health hazards caused by exposure during handling operations.

Method used

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  • Sludge-based adsorbent used for desulfurization and demercuration of flue-gas and preparation method thereof
  • Sludge-based adsorbent used for desulfurization and demercuration of flue-gas and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] Step S01: Take municipal sludge with a moisture content of 99.0%, and sequentially add H with a mass fraction of 40% to the sludge slurry 3 PO 4 and H 2 SO 4 As an activator, stir for 15 minutes, the activator is 20% of the dry weight of the sludge; then add Ca(OH) with a mass ratio of 3:1 2 Mix with biomass particles as a physical regulator, stir for 5 minutes, and the physical regulator is 50% of the dry weight of the sludge; after mixing, use a plate and frame filter press to dehydrate.

[0038] Step S02: Dry the activated sludge under air at room temperature for several hours, then grind and sieve to obtain sludge with a particle size of 0.1-2mm.

[0039] Step S03: at N 2 Under the atmosphere, the sieved sludge was heated to 500 °C at a heating rate of 15 °C / min and kept for 90 min for pyrolysis, and then activated by steam for 30 min. 2 The sludge-based adsorbent is prepared by cooling to room temperature in a protected state.

[0040] The BET specific surfac...

Embodiment 2

[0044] Step S01: Take municipal sludge with a moisture content of 95.5%, and add ZnCl with a mass ratio of 1:1 to the sludge slurry 2 and FeCl 3 Make a solution with a mass fraction of 50% as an activator, stir for 5 minutes, and the activator is 50% of the dry weight of the sludge; then add CaO and coal powder with a mass ratio of 1:2 as a physical regulator, stir for 10 minutes, and physically adjust The agent is 60% of the dry basis weight of the sludge; after mixing, the belt filter press is used for dehydration.

[0045] Step S02: Dry the activated sludge at 45° C. for 1.5 h, then grind and sieve to obtain sludge with a particle size of 0.1-2 mm.

[0046] Step S03: at N 2 Under the atmosphere, the sieved sludge was heated to 600°C at a heating rate of 50°C / min and held for 30 minutes for pyrolysis, and then activated by steam for 60 minutes. 2 The sludge-based adsorbent is prepared by cooling to room temperature in a protected state.

[0047] The BET specific surface ...

Embodiment 3

[0051] Step S01: Take papermaking sludge with a moisture content of 90.0%, and add CaCl with a mass ratio of 2:1 to the sludge slurry 2 Make a solution with a mass fraction of 60% with KOH as an activator, stir for 5 minutes, and the activator is 65% of the dry weight of the sludge; then add CaCO with a mass ratio of 1:1 3 1. Fly ash is used as a physical regulator, stirring for 15 minutes, and the physical regulator is 50% of the dry weight of the sludge; after mixing, use a plate and frame filter press to dehydrate.

[0052] Step S02: Dry the activated sludge at 105°C for 1 hour, then grind and sieve to obtain sludge with a particle size of 0.1-2mm.

[0053] Step S03: at N 2 Under the atmosphere, the sieved sludge was heated up to 1000°C at a heating rate of 60°C / min and held for 10 minutes for pyrolysis, and then activated by steam for 180 minutes. 2 The sludge-based adsorbent is prepared by cooling to room temperature in a protected state.

[0054] The sludge-based adso...

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Abstract

The invention provides a sludge-based adsorbent used for desulfurization and demercuration of flue-gas and a preparation method thereof. The sludge-based adsorbent employs municipal sludge and/or papermaking sludge as a raw material. The preparation method comprises the following steps: adding an activator and a physical conditioning agent into sludge slurry and carrying out mixing under stirring and mechanical dehydration; carrying out grinding and screening after drying; and carrying out physical activation after pyrolysis in an inert atmosphere so as to prepare the sludge-based adsorbent. According to the invention, the sludge slurry is used as a raw material, and uniformity of the activator and the physical conditioning agent is improved by using a wet method and the means of mixing; the activator and the physical conditioning agent can reduce repulsive interaction and hydrophilic interaction among electronegative sludge particles, and a porous lattice structure with a hard texture and good permeability is formed in a sludge cake obtained after pressure filtration and dehydration; the prepared adsorbent can be used for desulfurization and demercuration of flue-gas; and the preparation method has the advantages of simple procedures, easily controllable conditions, capacity of realizing harmony and unity of sludge treatment and resource utilization and good economic benefits, environmental benefits and social benefits.

Description

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Claims

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Application Information

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Owner HUAZHONG UNIV OF SCI & TECH
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