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Metal ions adsorbed by bentonite and regenerating method thereof

A technology of metal ions and bentonite, applied in the direction of separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of a large amount of waste acid or waste alkali, danger, increasing the amount of bentonite and cost, etc.

Active Publication Date: 2014-08-27
新疆德安环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the current research level, when bentonite treats metal ion wastewater, it is advisable to choose raw soil or a composite adsorbent composed of other materials; because although modified by some methods, the adsorption performance of bentonite may be improved. However, this often greatly increases the cost. Although bentonite has a good treatment effect in adsorbing metal ions, if it is not recycled, it will inevitably increase the amount and cost of bentonite, and it is likely to cause secondary pollution. Pollution
At present, most of the literature adopts the method of desorption under strong acid or strong alkali conditions to regenerate the bentonite that has adsorbed metal ions, but this will also produce a large amount of waste acid or waste alkali, and if the metal ions collected by desorption are not further processed Transformation is also dangerous and may cause secondary pollution

Method used

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  • Metal ions adsorbed by bentonite and regenerating method thereof
  • Metal ions adsorbed by bentonite and regenerating method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] To 1000mL100mg L -1 15g of calcium-based bentonite was added to the copper sulfate solution, and after being adsorbed for 8 hours under stirring conditions, it was centrifuged, and the remaining Cu in the solution was determined by atomic adsorption spectrometry. 2+ concentration. Then, redisperse the obtained bentonite in 300mL of distilled water, then add 150mL of ethanol, 150mL of n-ethane and 1.5g of sodium oleate, reflux and stir at 70°C for 2h, let it cool down, then transfer the solution system to the liquid separation In the funnel, separate the water phase and the oil phase; centrifuge the lower water phase, wash the precipitate with water and centrifuge again, dry it at 60°C for 12 hours and grind it to obtain the regenerated bentonite; wash the upper oil phase with distilled water, Stand still, remove the lower aqueous phase, repeat 2 or 3 times, and then spin evaporate at 60°C and recover the organic solvent, and at the same time obtain a blue-green viscous...

Embodiment 2

[0022] To 1000mL100mg L -1 15g of calcium-based bentonite was added to the nickel nitrate solution, and after being adsorbed for 8 hours under stirring conditions, it was centrifuged, and the remaining Ni in the solution was determined by atomic adsorption spectrometry. 2+concentration, then redisperse the obtained bentonite in 300mL distilled water, then add 150mL ethanol, 150mL n-ethane and 1.5g sodium oleate, reflux and stir at 70°C for 2h, let it stand until cooling, then transfer the solution system to In the liquid funnel, separate the water phase and the oil phase; centrifuge the lower water phase, wash the precipitate with water and centrifuge again, dry it at 60°C for 12 hours and grind it to obtain the regenerated bentonite; wash the upper oil phase with distilled water , stand still, remove the lower aqueous phase, repeat for 2 or 3 times, then spin evaporate at 60°C and recover the organic solvent, and at the same time obtain green viscous nickel oleate; after that...

Embodiment 3

[0024] To 1000mL100mg L -1 15g of calcium-based bentonite was added to the cobaltous chloride solution, and after being adsorbed for 8 hours under stirring conditions, it was centrifuged, and the remaining Co in the solution was determined by atomic adsorption spectrometry. 2+ concentration, then redisperse the obtained bentonite in 300mL of distilled water, then add 150mL of ethanol, 150mL of n-ethane and 1.5g of sodium oleate, reflux and stir at 70°C for 2h, let it stand until it cools down, then transfer the solution system to In a separatory funnel, separate the water phase and the oil phase; centrifuge the lower water phase, wash the precipitate with water and centrifuge again, dry it at 60°C for 12 hours and grind it to obtain the regenerated bentonite; wash the upper oil phase with distilled water Washing, standing still, separating the lower aqueous phase, repeating 2 or 3 times, then rotating at 60 ° C and recovering the organic solvent, and simultaneously obtaining p...

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Abstract

The invention relates to metal ions adsorbed by bentonite and a regenerating method of the metal ions adsorbed by the bentonite. According to the regenerating method, a good effect is achieved by treating Cu2+, Ni2+ and Co 2+ waste water through the bentonite serving as an adsorbent, after the collected metal ions are subjected to complexation and separation in a two-phase system, the metal ions adsorbed by the bentonite and oleic acid radical ions are subjected to complexation and transferred to an organic phase, the bentonite in a water phase can continue to be used for adsorbing metal ions after being washed centrifugally, the oleic acid-metal coordination compound in the oleic phase is respectively calcinated in the argon environment and the air environment to form nano metal oxide powder with high added-value, and resource utilization of the metal ions is achieved.

Description

technical field [0001] The invention relates to the regeneration of bentonite, especially the bentonite which absorbs metal ions can be used repeatedly, and also realizes the resource utilization of metal ions. Background technique [0002] With the development of modern industry, the treatment of metal ion wastewater has become a very serious and urgent problem to be solved. Researchers have developed many methods to deal with metal ion wastewater, such as precipitation, electrolysis, ion exchange, adsorption, Electrodialysis, reverse osmosis, etc. Among the above water treatment technologies, adsorption technology is favored because of its simple operation, low cost, good effect, and wide range of material sources; there are many kinds of adsorbents for metal ions , such as activated carbon, nano-metal oxides, polymer materials, clay minerals and agricultural by-products, etc., as a cheap and common layered silicate clay mineral, bentonite due to its abundant reserves, low...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/34C02F1/28C02F1/62
Inventor 宿新泰郝涛李志娟杨超王吉德叶松史江华马莉达寇全新
Owner 新疆德安环保科技股份有限公司
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