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heavy metal adsorbent

An adsorbent and heavy metal technology, applied in non-metallic elements, alkali metal compounds, adsorption water/sewage treatment, etc., can solve the problem of low heavy metal removal performance, and achieve particles that are not easy to disintegrate, high adsorption capacity, and high particle strength Effect

Active Publication Date: 2022-06-07
MIZUSAWA INDAL CHEM LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned adsorbents have the disadvantage of extremely low heavy metal removal performance in running water

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0068] In the preparation of the aqueous slurry, there is no restriction on the order of adding each of the raw materials (A), (B) and water, etc. However, when aggregation and gelation phenomena (thickening) occur, the aforementioned fine granulation and integrated compounding may be hindered. Worries about progressing. Therefore, the solid content concentration of the aqueous slurry is preferably low. On the other hand, from the viewpoints of productivity and economical efficiency, those having a higher solid content concentration are preferred. Therefore, the solid content concentration is preferably 3 to 15% by mass, particularly preferably 8 to 13% by mass.

[0069] In addition, the preparation of the above-mentioned homogeneously mixed aqueous slurry and the subsequent aging are usually carried out under stirring in a stirring tank equipped with stirring blades, but may be carried out under pulverization or dispersion by a wet ball mill or a colloid mill.

[0070] In a...

Embodiment

[0094] The excellent effects of the present invention will be explained by the following experimental examples.

[0095] (1) Hole capacity

[0096] The measurement was performed by a mercury porosimetry method using AutoPore IV 9500 manufactured by Micromeritics. The pore volume with a pore diameter of 3.5 to 10.0 nm was obtained from the indentation amount of 20000 to 60000 psia, and the pore volume with a pore diameter of 3.5 to 5000.0 nm was obtained from the indentation amount of 30 to 60000 psia.

[0097] (2) Compressive strength

[0098] Using a micro-compression tester MCT-510 manufactured by Shimadzu Corporation, the compressive strength of 20 particles of each heavy metal adsorbent was measured, and the median value was taken as the compressive strength of the heavy metal adsorbent.

[0099] (3) Saturated adsorption capacity

[0100] Sample water (lead (II) nitrate aqueous solution) having a lead concentration of 2000 ppm was prepared. To 1 L of the sample water, ...

Embodiment 1

[0120] The silica-magnesia preparation used in Comparative Example 3 was calcined at 550° C. for 4 hours and used as a heavy metal adsorbent.

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Abstract

The heavy metal adsorbent of the present invention is formed from silica-magnesia composite particles obtained by integrally compounding silica and magnesia. The pore volume measured by mercury intrusion porosimetry at a pore diameter of 3.5-10.0 nm is in the range of 0.26-0.50 mL / The range of g and the pore volume at 3.5 to 5000.0 nm are in the range of 1.30 to 2.50 mL / g, and the compressive strength is 1.5 MPa or more. The heavy metal adsorbent of the present invention is inexpensive, does not contain aluminum, and has high performance in removing heavy metals in running water, especially lead.

Description

technical field [0001] The present invention relates to a heavy metal adsorbent, and more specifically, to a heavy metal adsorbent which is excellent in the adsorption properties of lead and is further suitable for use as a water purification material. Background technique [0002] Conventionally, as heavy metal adsorbents for adsorbing lead and the like, amorphous titanium-silicon compounds, X-type zeolite, A-type zeolite, and the like have been known (see Patent Document 1). [0003] Among such heavy metal adsorbents, amorphous titanium-silicon compounds present a rather expensive problem. On the other hand, since the zeolite-based heavy metal adsorbent contains aluminum, there is a problem of aluminum elution. Therefore, applications such as filters for water purifiers are limited. [0004] In addition, it has been reported that a silica-magnesia preparation and a magnesium-surface-treated silica gel particle are excellent in adsorption capacity of heavy metals such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/20B01J20/28C01B33/12C02F1/28
CPCB01J20/10B01J20/20B01J20/28C01B33/12C02F1/28B01J20/103B01J20/041B01J20/28083B01J20/28071B01J20/28076C02F1/288C02F1/281B01D35/02C02F2101/20
Inventor 樱井淳任藤原隆黑崎浩司今西正千代藤元勇树
Owner MIZUSAWA INDAL CHEM LTD
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