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A kind of modified fly ash adsorbent and its preparation method and application

A fly ash and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of high material cost, poor adsorption effect of heavy metals, etc., to reduce reaction energy consumption, Achieve resource utilization and reduce production costs

Active Publication Date: 2021-10-29
DATANG ENVIRONMENT IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the currently used adsorbents are artificially synthesized, and the cost of materials is relatively high.
At the same time, coal-fired power plants produce a large amount of fly ash every day. Fly ash is naturally porous and is a good substrate for adsorption materials. Its adsorption effect on heavy metals is not good, so it needs to be modified to have high adsorption material

Method used

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  • A kind of modified fly ash adsorbent and its preparation method and application

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Effect test

Embodiment 1

[0038] 1. Preparation of modified fly ash adsorbent

[0039] Take the fly ash from a power plant, grind it, and sieve it to get the pretreated fly ash with a particle size of about 100 microns.

[0040]Add an appropriate amount of water, ferrous sulfate solution and ferric chloride salt solution to the above-mentioned pretreated fly ash, and adjust the pH value to 8.5 to control the ratio between the quality of fly ash and the total mass of ferrous sulfate and ferric chloride. The ratio is 100:1, and the molar ratio of ferrous sulfate to ferric chloride is 1:2. Under the conditions of room temperature and 160r / min, the primary modification is performed for 60 minutes to obtain primary modified fly ash.

[0041] Add calcium hydroxide to the above-mentioned primary modified fly ash, control the mass ratio of primary modified fly ash to calcium hydroxide to 10:1, slowly stir at 60r / min for 30 minutes, and then age for 2 hours to obtain Secondary modified fly ash.

[0042] The s...

Embodiment 2

[0049] 1. Preparation of modified fly ash adsorbent

[0050] Take the fly ash from a power plant, grind it, and sieve it to get the pretreated fly ash with a particle size of about 200 microns.

[0051] Add an appropriate amount of water, ferrous sulfate solution and ferric chloride salt solution to the above-mentioned pretreated fly ash, and adjust the pH value to 8.5 to control the ratio between the quality of fly ash and the total mass of ferrous sulfate and ferric chloride. The ratio is 80:1, and the molar ratio of ferrous sulfate to ferric chloride is 1:2. Under the conditions of room temperature and 140r / min, the primary modification is performed for 80 minutes to obtain primary modified fly ash.

[0052] Add calcium hydroxide to the above-mentioned primary modified fly ash, control the mass ratio of primary modified fly ash and calcium hydroxide to 20:1, stir slowly at 40r / min for 40 minutes, and then age for 5 hours to obtain Secondary modified fly ash.

[0053] The ...

Embodiment 3

[0058] Except that the reactor structure adopted is different, all the other are basically the same as Example 1.

[0059] combine figure 1 , the reactor structure of the present embodiment is as follows:

[0060] The reactor of this embodiment has a shell 1, and inside the shell 1 is provided with at least two packing layers 2 arranged at intervals up and down, and a sedimentation zone is set below the packing layer 2, and the modified fly ash of Example 1 is adsorbed The heavy metal wastewater flows through the packing layer 2 from top to bottom and contacts with the modified fly ash adsorbent in the packing layer 2. The filling amount of the modified fly ash adsorbent is equal to that of the wastewater in the reactor. 2%.

[0061] The housing 1 is set to a cylindrical shape, and the packing layer 2 adopts porous sponge, and the total height of the packing layer 2 is the same as that of the packing layer in embodiment 1; an arc top 3 is arranged between adjacent packing la...

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Abstract

The invention provides a modified fly ash adsorbent as well as its preparation method and application. The preparation method of the modified fly ash adsorbent of the present invention comprises the following steps: A) pulverizing and sieving the fly ash to obtain pretreated fly ash; B) using ferrous salt and iron salt at normal temperature Perform primary modification on pretreated fly ash to obtain primary modified fly ash; C) use calcium hydroxide to perform secondary modification on primary modified fly ash to obtain secondary modified fly ash; D) The secondary modified fly ash is filtered, dried, roasted and pulverized to obtain a modified fly ash adsorbent. The modified fly ash adsorbent of the invention has low production cost, high removal efficiency of heavy metals, and good economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a modified fly ash adsorbent and its preparation method and application. Background technique [0002] With the rapid development of my country's industry, various industrial production activities, including energy mining, power generation, metallurgy, electroplating, mining, etc., involve the processing and use of a large number of heavy metal minerals and raw materials, resulting in a large amount of heavy metal polluted wastewater. The widespread and persistent harm of heavy metal pollution to human health and environmental safety has attracted increasing attention. [0003] In terms of heavy metal wastewater treatment technology, the traditional neutralization flocculation precipitation method is mainly through the addition of Ca(OH) 2 , aluminum salts, iron salts, organic sulfur and other traditional water treatment chemicals to remove many heavy metals, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/20
CPCB01J20/0229B01J20/041B01J20/06B01J20/08B01J20/103C02F1/288C02F2101/20
Inventor 刘海洋白玉勇于志成杨芳谷小兵曹书涛杨言
Owner DATANG ENVIRONMENT IND GRP
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