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Preparation method of pulverized coal fly ash carrier heavy metal adsorbent and product thereof

An adsorbent and heavy metal technology, which is applied in the field of preparation of fly ash carrier heavy metal adsorbents, can solve the problems of low adsorption efficiency and removal of adsorbents, and achieves high thermal stability, high adsorption efficiency and high adsorption activity. Effect

Active Publication Date: 2021-01-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at one or more of the above defects or improvement needs of the prior art, the present invention provides a method for preparing a fly ash carrier heavy metal adsorbent and its product. The fly ash of the target component is selected and screened Prepare the required adsorbent carrier, and uniformly solidify kaolin, Fe, and Ca powder on the surface of fly ash particles by physical blending-high-temperature calcination, thereby preparing the required adsorbent. The operation is simple, the cost is low, the raw materials are extensive, and the composite The adsorbent integrates a variety of active components, thereby solving the technical problems of low adsorption efficiency of the adsorbent and synergistic removal of various heavy metals

Method used

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  • Preparation method of pulverized coal fly ash carrier heavy metal adsorbent and product thereof
  • Preparation method of pulverized coal fly ash carrier heavy metal adsorbent and product thereof
  • Preparation method of pulverized coal fly ash carrier heavy metal adsorbent and product thereof

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preparation example Construction

[0030] figure 1 It is a flowchart of a preparation method of a fly ash carrier heavy metal adsorbent constructed according to a preferred embodiment of the present invention, as figure 1 Shown, this preparation method comprises the following steps:

[0031] (1) Take fly ash as a raw material, analyze the ratio of various metal components in the coal ash, screen out the required fly ash as the raw material of the adsorbent, obtain the fly ash particles with the required particle size after screening, and select the Fly ash particles with a diameter of 0.1-0.4 mm are used as the adsorbent carrier; the main component of fly ash is SiO 2 and Al 2 o 3 , where SiO 2 The content is 20%~40%, Al 2 o 3 The content is 40%~60%, and SiO 2 and Al 2 o 3 The total amount is not less than 70%;

[0032] (2) Mix kaolin powder, Fe powder, and Ca powder with fly ash particles according to the proportion of 5-10% of the mass of the fly ash particle carrier, stir evenly, and calcinate in a...

Embodiment 1

[0041] (1) Take fly ash as a raw material, analyze the ratio of various metal components in the coal ash, screen out the required fly ash as the raw material of the adsorbent, obtain the fly ash particles with the required particle size after screening, and select the Fly ash particles with a diameter of 0.1 mm are used as the adsorbent carrier; the main component of fly ash in this example is SiO 2 and Al 2 o 3 , where SiO 2 Content is 30%, Al 2 o 3 The content is 50%;

[0042] (2) Mix 0.6g of kaolin powder, 0.5g of Fe powder, 1g of Ca powder and 10g of fly ash particles, stir evenly and calcinate in a constant temperature tube furnace at 1000°C for 20min, and cool to obtain the required adsorbent.

Embodiment 2

[0044] (1) Take fly ash as a raw material, analyze the ratio of various metal components in the coal ash, screen out the required fly ash as the raw material of the adsorbent, obtain the fly ash particles with the required particle size after screening, and select the Fly ash particles with a diameter of 0.2 mm are used as the adsorbent carrier; the main component of fly ash in this example is SiO 2 and Al 2 o 3 , where SiO 2 Content is 20%, Al 2 o 3 The content is 60%;

[0045] (2) Mix 0.5g of kaolin powder, 0.7g of Fe powder, 0.8g of Ca powder and 10g of fly ash particles, stir evenly and calcinate in a constant temperature tube furnace at 900°C for 30min, and cool to obtain the required adsorbent.

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Abstract

The invention discloses a preparation method of a pulverized coal fly ash carrier heavy metal adsorbent, which comprises the following steps: S1, selecting pulverized coal fly ash as a raw material, analyzing the proportion of multiple metal components in the pulverized coal fly ash, screening out the required pulverized coal fly ash as an adsorbent raw material, and screening to obtain fly ash particles with required particle sizes as an adsorbent carrier, wherein the main components of the pulverized coal fly ash are SiO2 and Al2O3; and S2, mixing kaolin powder, Fe powder, Ca powder and thefly ash particles, uniformly stirring, calcining at high temperature, and cooling to obtain the adsorbent. The invention also discloses a pulverized coal fly ash carrier heavy metal adsorbent. Pulverized coal fly ash particles are adopted as a carrier, kaolin, Fe and Ca powder are uniformly solidified on the surfaces of the fly ash particles in a physical mixing and high-temperature calcining mode, and therefore the needed adsorbent is prepared, multiple active components are integrated, and the technical problems that the adsorption efficiency of the adsorbent is low and multiple heavy metalsare synergistically removed are solved.

Description

technical field [0001] The invention belongs to the technical field of heavy metal adsorbents in organic solid waste gasification gas, and more specifically relates to a preparation method of fly ash carrier heavy metal adsorbents and products thereof. Background technique [0002] The pyrolysis and gasification of organic solid waste is the most effective way to realize the resource utilization of organic solid waste. However, the composition of organic solid waste is complex, containing As, Pb, Cd, Cr, Hg and other elements with significant biological toxicity. According to the volatile characteristics, Hg belongs to volatile heavy metals, As, Cd, and Pb belong to semi-volatile heavy metals, and Cr belongs to hard volatile heavy metals. The use of heavy metal adsorbents is the main way to control the release of heavy metals. During the pyrolysis and gasification process of organic solid waste, ~30% As, ~20-30% Pb, a small amount of Cr, and 13-25% Cd are released into the f...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/30C10K1/32B01D53/02
CPCB01J20/103B01J20/12B01J20/08B01J20/06B01J20/041C10K1/32B01D53/02B01D2257/60
Inventor 余圣辉张成袁昌乐马仑谭鹏陈刚方庆艳
Owner HUAZHONG UNIV OF SCI & TECH