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Method for preparing polyferric chloride flocculating agent from waste incineration fly ash and waste iron slag

A waste incineration fly ash and polyferric chloride technology, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, solid waste management, etc., can solve the problem of high chlorine content, achieve strong adsorption, and have a wide range of raw material sources , The effect of simple preparation process

Active Publication Date: 2020-12-11
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: In view of the above problems, the present invention proposes a method for preparing polymeric ferric chloride flocculant by using waste incineration fly ash and waste iron slag, making full use of the characteristics of the two waste materials

Method used

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  • Method for preparing polyferric chloride flocculating agent from waste incineration fly ash and waste iron slag
  • Method for preparing polyferric chloride flocculating agent from waste incineration fly ash and waste iron slag
  • Method for preparing polyferric chloride flocculating agent from waste incineration fly ash and waste iron slag

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Experimental program
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Effect test

Embodiment 1

[0019] Influence of waste incineration fly ash and water-solid-liquid ratio on the adsorption performance of prepared polyferric chloride flocculant

[0020] Preparation of polyferric chloride flocculant: as figure 1 As shown, according to the solid-liquid ratio of waste incineration fly ash to water, they are 0.5:1, 0.7:1, 0.9:1, 1:1, 1.5:1, 2:1, 2.1:1, 2.3:1, 2.5:1 (g:mL) Mix waste incineration fly ash and water, stir evenly to obtain waste incineration fly ash slurry, pour the waste incineration fly ash slurry into the sample disposal area of ​​the electrodynamic reaction tank, add 0.05mol / L chloride chloride to the cathode and anode respectively Sodium aqueous solution to the waste incineration fly ash slurry piled up in the sample disposal area, start the power supply for 0.5 hours of electric disposal, the voltage gradient loaded on the sample area during the electric process is 0.5V / cm; take scrap iron slag and grind for 1 hour to obtain scrap iron Slag powder, accordi...

Embodiment 2

[0037] Influence of the concentration of sodium chloride aqueous solution on the adsorption performance of the prepared polyferric chloride flocculant

[0038] Preparation of polymerized ferric chloride flocculant: Mix waste incineration fly ash and water according to the ratio of waste incineration fly ash to water to solid-liquid 2:1 (g:mL), stir evenly to obtain waste incineration fly ash slurry, and mix waste incineration fly ash slurry Pour into the sample disposal area of ​​the electric reaction tank, add 0.025, 0.035, 0.045, 0.05, 0.275, 0.5, 0.525, 0.55, 0.6mol / L sodium chloride aqueous solution to the cathode and anode respectively until the garbage piled up in the sample disposal area Incinerate the fly ash slurry, start the power supply for 2 hours of electric treatment, the voltage gradient loaded on the sample area during the electric process is 2V / cm; take the scrap iron slag and grind it for 2 hours to obtain the scrap iron slag powder, according to the ratio of ...

Embodiment 3

[0045] Effect of Voltage Gradient on the Adsorption Performance of the Prepared Polyferric Chloride Flocculant

[0046] Preparation of polymerized ferric chloride flocculant: Mix waste incineration fly ash and water according to the ratio of waste incineration fly ash to water to solid-liquid 2:1 (g:mL), stir evenly to obtain waste incineration fly ash slurry, and mix waste incineration fly ash slurry Pour it into the sample disposal area of ​​the electrodynamic reaction tank, add 0.5mol / L sodium chloride aqueous solution to the cathode and anode respectively to cover the waste incineration fly ash slurry piled up in the sample disposal area, start the power supply for 3.5 hours of electrodynamic disposal, and the samples during the electrodynamic process The voltage gradients loaded in the region are 0.25V / cm, 0.35V / cm, 0.45V / cm, 0.5V / cm, 2V / cm, 3.5V / cm, 3.6V / cm, 3.8V / cm, 4V / cm Get scrap iron slag and grind for 3 hours to obtain scrap iron slag powder, mix scrap iron slag pow...

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Abstract

The invention discloses a method for preparing a polyferric chloride flocculant from waste incineration fly ash and waste iron slag. The method comprises the following steps: (1) uniformly mixing waste incineration fly ash with water to obtain waste incineration fly ash slurry, pouring the waste incineration fly ash slurry into a sample area of an electric device, respectively adding a sodium chloride aqueous solution into the anode and cathode until the sodium chloride aqueous solution submerges the waste incineration fly ash slurry, and starting the electric device to perform power-on treatment; (2) grinding waste iron slag, uniformly mixing the ground waste iron slag with water to obtain iron-based dechlorinated slurry, and introducing gas in an electric anode chamber into the iron-based dechlorinated slurry to obtain chlorine-loaded iron-based slurry; (3) after the electrifying treatment is finished, uniformly mixing the anode electrolytic solution with the chlorine-loaded iron-based slurry, and aging to obtain chlorine-iron flocculation slurry; and (4) uniformly mixing the cathode electrolytic solution with the chlorine-iron flocculation slurry, aging, drying and grinding to obtain the polyferric chloride flocculant. According to the method, the characteristics of the two waste materials are fully utilized, chlorine in the waste incineration fly ash is transferred into theiron-based material through an electric treatment technology, and COD, total phosphorus, ammonia nitrogen and mercury ions in the water body can be efficiently removed through the flocculant.

Description

technical field [0001] The invention relates to a preparation method of a polyferric chloride flocculant, in particular to a method for preparing a polyferric chloride flocculant by utilizing waste incineration fly ash and waste iron slag. Background technique [0002] Inorganic polymer flocculants mainly include aluminum-based flocculants and iron-based flocculants. Among them, iron-based flocculants are suitable for low-temperature and low-turbidity waste liquid treatment, and have the advantages of safety, non-toxicity, large alum flowers, and fast settlement. Iron-based inorganic flocculants mainly include polyferric chloride (PFC) and polyferric sulfate (PFS). Polyferric chloride (PFC) has been widely used in the purification of urban sewage and industrial sewage. The preparation of polymerized ferric chloride flocculants using iron-based materials not only requires tedious steps such as acid leaching, filtration, precipitation, modification, and aging, but also requi...

Claims

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Application Information

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IPC IPC(8): C02F1/52
CPCC02F1/5236Y02W30/91
Inventor 黄涛宋东平张克金俊勋杜晶刘龙飞周璐璐
Owner CHANGSHU INSTITUTE OF TECHNOLOGY