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Modified fly ash adsorbent as well as preparation method and application thereof

A technology of fly ash and adsorbent, applied in the field of adsorption, can solve problems such as poor adsorption and removal effect, and achieve the effect of strong practicability, guaranteeing normal production and realizing secondary utilization.

Pending Publication Date: 2021-06-08
广州珠江电力有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a modified fly ash adsorbent and its preparation method and application, aiming to solve the problem of fluoride, chloride ion, sulfide and mercury, lead, nickel, arsenic, cadmium in the current flue gas desulfurization wastewater The problem of poor adsorption and removal of heavy metal ions such as chromium and chromium

Method used

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  • Modified fly ash adsorbent as well as preparation method and application thereof
  • Modified fly ash adsorbent as well as preparation method and application thereof
  • Modified fly ash adsorbent as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The preparation of modified fly ash adsorbent comprises the following steps:

[0037] (1) Mix fly ash and milk of lime at normal temperature, after soaking for 24 hours, filter, dry and pulverize to obtain alkali-modified fly ash;

[0038] (2) Preparation of iron-modified fly ash: heat the ferric chloride solution to 80-100°C, add fly ash to the ferric chloride solution and mix and impregnate for 30 minutes, after cooling, filter, dry and pulverize to obtain iron-modified fly ash;

[0039] (3) Prepare modified pomelo peel powder: dry fresh pomelo peel at 85° C. and then pulverize it, pass through a 40-mesh sieve to obtain pomelo peel powder with a particle size of ≤0.42 mm, add the pomelo peel powder to the hydrochloric acid solution and mix evenly. Heating at 120°C for 2 hours, cooling after reaction, washing with water, filtering, drying at 85°C, crushing, and passing through a 40-mesh sieve to obtain particles with a particle size of ≤0.42mm, which is the modified p...

Embodiment 2

[0046] The preparation of modified fly ash adsorbent comprises the following steps:

[0047] (1) Mix fly ash and milk of lime at normal temperature, after soaking for 20 hours, filter, dry and pulverize to obtain alkali-modified fly ash;

[0048] (2) Preparation of iron-modified fly ash: heat the ferric chloride solution to 80-100°C, add fly ash to the ferric chloride solution and mix and impregnate for 20 minutes, after cooling, filter, dry and pulverize to obtain iron-modified fly ash;

[0049] (3) Preparation of modified pomelo peel powder: fresh pomelo peel powder is dried at 95° C., crushed, and passed through a 40-mesh sieve to obtain a pomelo peel powder with a particle size of ≤0.42 mm. The pomelo peel powder is added to the hydrochloric acid solution and mixed evenly. Heating at 140°C for 1.5h, cooling after reaction, washing with water, filtering, drying at 95°C, crushing, and passing through a 40-mesh sieve to obtain particles with a particle size of ≤0.42mm, which...

Embodiment 3

[0056] The preparation of modified fly ash adsorbent comprises the following steps:

[0057] (1) Mix fly ash and milk of lime at normal temperature, after soaking for 24 hours, filter, dry and pulverize to obtain alkali-modified fly ash;

[0058] (2) Preparation of iron-modified fly ash: heat the ferric chloride solution to 80-100°C, add fly ash to the ferric sulfate solution and mix and impregnate for 30 minutes, after cooling, filter, dry and pulverize to obtain iron-modified powder coal ash;

[0059] (3) Preparation of modified pomelo peel powder: dry fresh pomelo peel at 105° C. and then pulverize it, pass through a 40-mesh sieve to obtain a pomelo peel powder with a particle size of ≤0.42 mm, add the pomelo peel powder to the hydrochloric acid solution and mix evenly. Heating at 160°C for 2 hours, cooling after reaction, washing with water, filtering, drying at 105°C, crushing, and passing through a 40-mesh sieve to obtain particles with a particle size of ≤0.42mm, which...

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Abstract

The invention provides a modified fly ash adsorbent as well as a preparation method and application thereof, and relates to the technical field of adsorption. The provided modified fly ash adsorbent is prepared from the following components in parts by weight: 50 to 60 parts of alkali modified fly ash, 30 to 40 parts of iron modified fly ash and 8 to 12 parts of modified shaddock peel powder. The prepared modified fly ash adsorbent can be used for flue gas desulfurization wastewater treatment, and has good adsorption and removal effects on fluorides, chloride ions, sulfides and heavy metal ions such as mercury, lead, nickel, arsenic, cadmium, chromium and the like in the flue gas desulfurization wastewater, and the quality of the treated water meets the requirements of the standard of an outlet monitoring project of a desulfurization wastewater treatment system in Discharge standard of wastewater from limestone-gypsum flue gas desulfurization system in fossil fuel power plants (DL / T 997-2006).

Description

technical field [0001] The invention relates to the technical field of adsorption, in particular to a modified fly ash adsorbent and its preparation method and application. Background technique [0002] Flue gas desulfurization wastewater from coal-fired power plants is mainly the discharge water from the absorption tower in the process of boiler flue gas wet desulfurization (limestone / gypsum method). In order to maintain the balance of substances in the slurry circulation system of the desulfurization unit and ensure the quality of gypsum, when the concentration of chloride ions in the slurry exceeds the specified value, a certain amount of wastewater must be discharged from the system. The wastewater mainly comes from the gypsum dehydration and cleaning system. Desulfurization wastewater is weakly acidic, with a pH value between 4 and 6. The impurities mainly include suspended solids, supersaturated sulfite, sulfate, chloride ions, fluoride ions, and mercury, lead, nickel,...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/10C02F101/12C02F101/14C02F101/20C02F101/22C02F103/18
CPCB01J20/041B01J20/08B01J20/103B01J20/24B01J20/0229C02F1/288C02F2103/18C02F2101/101C02F2101/14C02F2101/12C02F2101/20C02F2101/22
Inventor 于峥田川王琼刘珍
Owner 广州珠江电力有限公司
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