Utilize metal salt solution to reclaim EDTA metal complex and regenerate the method for chlorine type anion exchange resin

A metal salt solution and exchange resin technology, applied in ion exchange, ion exchange regeneration, preparation of organic compounds, etc., can solve the problems of poor resin regeneration effect, difficult treatment of concentrated waste liquid, and low recovery efficiency of EDTA metal complexes , to achieve good regeneration effect, reduce processing time and cost, and high recovery rate

Active Publication Date: 2019-05-10
HUNAN AGRICULTURAL UNIV
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Problems solved by technology

[0005] The purpose of this invention is to provide a kind of method that utilizes metal salt solution to reclaim EDTA cadmium metal complex and regeneration chlorine type anion exchange resin, to solve the low recovery efficiency of EDTA metal complex and resin Problems such as poor regeneration effect and difficult treatment of subsequent concentrated waste liquid

Method used

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  • Utilize metal salt solution to reclaim EDTA metal complex and regenerate the method for chlorine type anion exchange resin
  • Utilize metal salt solution to reclaim EDTA metal complex and regenerate the method for chlorine type anion exchange resin
  • Utilize metal salt solution to reclaim EDTA metal complex and regenerate the method for chlorine type anion exchange resin

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example 1

[0018] Example one: the soil used in the test is taken from the downstream farmland of Huanggu Village, Zhuzhou County, Hunan Province, and after mixing and stirring with Ca-EDTA solution, EDTA cadmium metal complex solution is obtained, and its basic physical and chemical properties are as shown in Table 1:

[0019] Table 1 Physicochemical properties and cadmium metal content in waste liquid

[0020]

[0021] The specific method is:

[0022] (1) Dynamic column adsorption: Precisely weigh 2.0g of chlorine-type anion exchange resin and put it into a glass chromatography column with a diameter-to-height ratio of 2.5-15, so that the resin layer height is 30mm, and put glass wool into the glass chromatography column At the top, at a constant temperature (25°C), use the obtained EDTA cadmium metal complex solution as an adsorption solution, use a constant flow pump to pump it into the glass chromatography column, and pass through the glass chromatography column from the top of t...

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Abstract

The invention relates to a method for recycling an EDTA metal complex and regenerating chlorine type anion exchange resin by utilizing a metallic salt solution. The method comprises the following steps: utilizing the chlorine type anion exchange resin to absorb an EDTA cadmium metal complex; taking the chlorine type anion exchange resin loaded with the EDTA cadmium metal complex as a treating object; selecting the metallic salt solution as a regenerating agent; dynamically regenerating the absorbed chlorine type anion exchange resin; treating the regenerated solution; and recycling EDTA and metal cadmium. After the treatment according to the method, the EDTA cadmium metal complex in a complex solution can be effectively recycled, and after the resin is reused for several times, the resin still has a better absorption effect, so that convenience is brought to the future large-scale test, a certain treatment time and cost are reduced, and the secondary pollution to the environment caused by the EDTA metal complex solution can be reduced.

Description

technical field [0001] The invention relates to a method for recovering EDTA metal complexes and regenerating chlorine-type anion exchange resins by utilizing metal salt solution. Background technique [0002] Ion exchange resin has the advantages of good chemical stability, high mechanical strength, and large exchange capacity, so it has been widely used in boiler water treatment and production of demineralized water and pure water. However, in the process of use, there are often phenomena such as continuous increase of cleaning water, poor quality of effluent water, continuous decrease of periodic water production, darker color, and continuous decrease of resin exchange capacity. According to the above phenomenon, it can be determined that the resin is contaminated. If reasonable measures are not taken in time to make it regenerated, the resin will become invalid or even scrapped, affecting normal production. [0003] At present, in the softening and desalination process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J49/00C07C227/40C07C229/76B09C1/08
CPCB09C1/08C07C227/40C07C229/76
Inventor 曾清如严律己胡疆周细红
Owner HUNAN AGRICULTURAL UNIV
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