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Preparation method of chelate adsorbent

A technology of chelating adsorbents and organic solvents, applied in the field of materials, can solve problems such as poor economy, property loss, landslides and debris flows, and achieve good stability

Inactive Publication Date: 2018-12-14
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once such a huge rock and soil mass fails, it will cause major disasters such as landslides and debris flows, causing heavy casualties, property losses and environmental pollution.
[0003] The silting of tailings dams is mainly physical silting and chemical silting. At present, the treatment of silting at home and abroad is mainly carried out by physical methods. Through tailings dam simulation experiments, fluid experiments and establishment of mathematical models, this situation can be changed. A porous media filtration system, which has problems such as low applicability (depending entirely on the internal conditions of the tailings dam), general anti-silting performance, and poor economy, which limits the application of anti-silting in tailings dams
However, there are few researches on anti-silting by chemical methods.

Method used

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  • Preparation method of chelate adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation of graft monomer EDTAD, its preparation steps are as follows:

[0030] Suspend 18g of EDTA (acid) in 31ml of anhydrous pyridine, then add 25ml of anhydride under nitrogen protection, and stir at 65°C for a certain period of time. According to this, the product is cooled and filtered under a stable nitrogen flow, washed with 200ml of anhydrous acetic anhydride and anhydrous acetic anhydride, and finally dried in a vacuum oven at 50-60°C to obtain the grafted monomer EDTAD. The EDTAD obtained by the reaction was tested by infrared.

[0031] The infrared spectrum of the present embodiment gained EDTAD sees figure 1 , in the infrared spectrum of EDTAD at 1809cm -1 and 1765cm -1 Absorption characteristic peaks appear and the low-frequency peak is slightly stronger than the high-frequency peak, which are two characteristic absorption peaks of the C=O stretching vibration absorption of the acid anhydride. These are the characteristic peaks of the cyclic anhy...

Embodiment 2

[0033] Suspend 30g of EDTA (acid) in 50m of anhydrous pyridine, then add 50ml of anhydride under nitrogen protection, and stir at 65°C for a certain period of time. According to this, the product was cooled and filtered under a stable nitrogen flow, washed with 200ml of anhydride and ether, and finally dried in a vacuum oven at 50-60°C to obtain the grafted monomer EDTAD. The EDTAD obtained by the reaction was tested by infrared.

[0034] The infrared spectrum of the present embodiment gained EDTAD sees figure 1 , in the infrared spectrum of EDTAD at 1796cm -1 and 1749cm -1 Absorption characteristic peaks appear and the low frequency peak is slightly stronger than the high frequency peak, which are two characteristic absorption peaks of the C=O stretching vibration absorption of the acid anhydride. These are the characteristic peaks of the cyclic anhydride. at 1252cm -1 The stretching vibration peak at is the C-O-C stretching vibration peak of the cyclic anhydride, at 1060...

Embodiment 3

[0036] 1g chitosan monomer is completely dissolved with 2ml glacial acetic acid, after a certain period of time, after dissolving, solution is added in 50mlN, in the N-dimethylformamide, then add 1g embodiment 1 gained EDTAD grafting monomer, and at 65 Polymerization reaction was carried out at ℃ and in a nitrogen-enclosed environment until the reaction was complete. After the reaction was completed, it was washed with 50ml of N,N-dimethylformamide and filtered, then washed with 100ml of distilled water for centrifugation, and then washed with 100ml of saturated sodium bicarbonate solution for centrifugation. , then wash with 100ml of distilled water and carry out centrifugation, finally wash with 50ml of 95% ethanol and carry out centrifugation, place it in a vacuum oven and dry it at 70°C to obtain the chitosan graft of the present invention.

[0037] The chitosan graft obtained is placed in the calcium solution of configuration and adsorbed for 2h, and the solution after ads...

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Abstract

The invention discloses a preparation method of a chelate adsorbent. The method comprises: dissolving chitosan in an acidic solution, then mixing the solution and an organic solvent, adding an ethylenediamine tetraacetic dianhydride graft monomer (EDTAD) into the mixed solution, carrying out a grafting polymerization reaction process at 60-80 DEG C in an inert gas protective atmosphere, and washing and drying the reaction product to obtain a chitosan graft. The chelate adsorbent has good adsorptivity, and the EDTAD grafted to the chitosan provides nodes particularly capable of firmly chelatingcalcium ions. The metal ions of the used adsorbent can be recovered by an elution method and can be used continuously. The chelate adsorbent has good stability inside the tailing dam.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a chelating adsorbent. Background technique [0002] The tailings dam is a dam formed by stacking and rolling the tailings. It is mainly used to store the tailings or industrial waste discharged from metal and non-metal mines after sorting ore. Under normal circumstances, the height of the dam body can reach tens of meters or even hundreds of meters. The tailings reservoir is different from the reservoir in the usual concept. The reservoir needs to raise the water level, so the dam body is mainly used for seepage prevention, while the tailings reservoir needs seepage drainage, otherwise the water level will be raised and the dam will easily break. There are stagnation ions (such as calcium ions and ferrous ions) in the waste liquid in the dam, which precipitate in a specific chemical environment to form water-insoluble compounds, which block...

Claims

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Application Information

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IPC IPC(8): B01J20/26C02F1/28
CPCB01J20/265C02F1/285
Inventor 杨隽赵启天徐恩松范志玮舒何进
Owner WUHAN INSTITUTE OF TECHNOLOGY
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