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Magnetic chemical absorber, process for producing the same, method of regenerating the same, and method of treating waste liquid

A technology for chemical absorption and waste liquid treatment, applied in chemical instruments and methods, adsorbed water/sewage treatment, solid adsorbent liquid separation, etc. Separation, usage reduction, cost reduction effect

Inactive Publication Date: 2009-08-12
NAGOYA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this kind of solid-liquid separation requires special equipment such as large-scale sedimentation tanks, it has a great burden on the environment and economy in terms of construction area, equipment investment, and operating costs.
[0008] In addition, the absorption capacity of harmful ions obtained by the above-mentioned conventional Schwittmannite is not necessarily fully satisfied.

Method used

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  • Magnetic chemical absorber, process for producing the same, method of regenerating the same, and method of treating waste liquid
  • Magnetic chemical absorber, process for producing the same, method of regenerating the same, and method of treating waste liquid
  • Magnetic chemical absorber, process for producing the same, method of regenerating the same, and method of treating waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] A magnetic chemical absorbent was produced by the production method shown below.

[0094] First, by adding ferrous chloride (FeCl 2 ) and ferric chloride (FeCl 3 ) mixture (FeCl 2 :FeCl 3 The molar ratio is 1:2) and slowly add diluted ammonia solution to adjust the pH to 8 to precipitate magnetite particles with an average particle diameter of about 10-100 nm. Next, magnetite fine particles are separated from solid and liquid by magnetic separation, and then washed several times until the pH value is 7, and the magnetite fine particles are ready.

[0095] Then, dissolve 25g of Fe in 500ml of distilled water 2 (SO 4 ) 3 ·5H 2 O to obtain an aqueous solution, which was heated to 60° C. and stirred slowly for 10 minutes (heating step).

[0096] Next, to the aqueous solution maintained at 60°C, 10 ml of a suspension in which 3 g of the magnetite microparticles were suspended in 1000 ml of distilled water was added, and then added to the aqueous solution maintained a...

Embodiment 2

[0150] ready as Figure 14 The experimental setup shown in the schematic diagram. In this experimental device, while the glass tube 2 is set in the magnetic field 1 from bottom to top, a magnetic filter 3 made of ferromagnetic wires is set at the position where the magnetic field gradient in the glass tube 2 is the largest.

[0151] And, apply the magnetic field 1 of intensity shown in Table 1, the 100ml waste water that will be suspended with the magnetic chemical absorber that embodiment 1 provides, flow down from above with 3~4 seconds in described glass tube 2, make this waste water flow from magnetic The top of the filter 3 passes downward. At this time, the mass ratio of the magnetic chemical absorbent that can be magnetically separated from wastewater was investigated, and the results are shown in Table 1.

[0152] For comparison, the Schwittmannite alone obtained in Comparative Example 1 was also investigated in the same manner. The results are shown in Table 1 toge...

Embodiment 3

[0158] In the waste water whose initial P concentration is 20mg / L and the pH value is 7, add the magnetic chemical absorbent provided by Example 1 with an addition ratio of 1g / L, stir for 3 hours, and make the magnetic chemical absorbent absorb the P in the wastewater. p. At this time, the P absorption rate of the new product state of the magnetic chemical absorbent provided in Example 1 was investigated, and as shown in Table 2, it was 99.7%.

[0159] It should be noted that this P absorptivity is obtained by a photometer.

[0160] In addition, the magnetic chemical absorbent provided in Example 1 that absorbs P in saturation can be put into a 0.05 mol / L sulfuric acid aqueous solution and stirred for 10 minutes, so that the magnetic chemical absorbent can be regenerated for the first time. Afterwards, the regenerated magnetic chemical absorbent was separated by filtration, washed with deionized water to reach a pH value of 7, and dried.

[0161] Furthermore, the P absorptio...

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Abstract

A magnetic chemical absorbent according to the present invention is provided with a composite, which is constituted of a core substance comprising magnetite fine particles and schwertmannite being precipitated around the core substance to chemically bond therewith. This magnetic chemical absorbent can be produced in a hydrolysis reaction step, in which crystal of schwertmannite is precipitated by means of hydrolysis reaction by heating a solution of ferric salt and thereafter adding a reactive substance thereto, by means of adding magnetite fine particles into the solution after the solution is heated and before the precipitation of the crystal begins. This magnetic chemical absorbent is novel and good one whose absorption capability for harmful ion is upgraded more. In accordance with a waste-liquid treating method using this magnetic chemical substance, it is possible to intend the reduction of burdens in view of environmental and economic aspects. Moreover, this magnetic chemical absorbent is recyclable.

Description

technical field [0001] The invention relates to a magnetic chemical absorbent, its manufacturing method, regeneration method and waste liquid treatment method. The magnetic chemical absorbent provided by the present invention, its production method, regeneration method and waste liquid treatment method can be suitably used to remove the harmful ions from the waste liquid containing harmful ions such as chromate ions, phosphate ions, and fluoride ions. on occasion. Background technique [0002] In recent years, due to the strengthening of environmental regulations and standards, waste liquid treatment to remove harmful ions from waste liquids containing chromate ions, phosphate ions, and fluoride ions has become an increasingly important research topic. And in this waste liquid treatment, there are strong calls for improvement of treatment efficiency and reduction of treatment cost. In particular, since chromate ions are widely used in chromium treatment such as electroplat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/34B03C1/00C01G49/00C02F1/28
CPCB01J20/0281B01J20/06C01G49/06B01D15/00C02F1/281C02F2101/14C02F1/66B01J20/3293C01P2002/72C01G49/08C01P2006/42C02F2101/22C02F2101/103C02F1/488C02F2101/006B03C1/015C01G49/009C02F2303/16C01P2004/03C01P2004/61B01J20/0229B01J20/28009C02F2101/20C02F1/288B01J20/34B01J20/3217B01J20/3433B01J20/3441B03C1/00C02F1/28
Inventor 兴户正纯坂东芳行阿库巴鲁·艾斯卡恩大鲁普鲁佐佐健介浅井滋生
Owner NAGOYA UNIVERSITY
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