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Method for separating and recovering multiple cation heavy metals in water through phase-transition regulation and control

A technology for separation and recovery of cations, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., to achieve the effects of low cost, simple equipment, and easy operation

Active Publication Date: 2017-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only achieve the separation and enrichment of heavy metal anions. The principle is that CO 2 React with magnesium hydroxide to generate magnesium carbonate trihydrate, which has almost no adsorption effect on heavy metal anions, so as to realize the desorption, separation and enrichment of heavy metal anions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Magnesium hydroxide on Pb in water 2+ / Zn 2+ adsorption separation

[0026] (1) Take Pb with a concentration of 100mg / L 2+ Solution 50mL and Zn concentration of 100mg / L 2+ 50 mL of the solution was mixed, and 50 mg of magnesium hydroxide was added to the mixture, stirred with a stirrer for 12 hours, and then centrifuged to obtain magnesium hydroxide slurry and a treated clear liquid. To the obtained supernatant to Pb 2+ and Zn 2+ Concentration was detected and Pb was measured 2+ The concentration is 0.062mg / L, Zn 2+ The concentration is 0.019mg / L.

[0027] (2) Take the magnesium hydroxide slurry obtained in step (1) and place it in a stainless steel container, add 10 mL of deionized water for stirring, seal the container and feed carbon dioxide gas, keep the container pressure at 0.5 Mpa, and react for 12 hours. Magnesium hydroxide in excess CO 2 In the presence of water and water, the reaction generates soluble magnesium bicarbonate, which is transferred from ...

Embodiment 2

[0031] Magnesium hydroxide to Eu in water 2+ / Pb 2+ adsorption separation

[0032] (1) Take Eu with a concentration of 100mg / L 2+ Solution 50mL and Pb at a concentration of 100mg / L 2+ 50 mL of the solution was mixed, and 50 mg of magnesium hydroxide was added to the mixture, stirred with a stirrer for 12 hours, and then centrifuged to obtain magnesium hydroxide slurry and a treated clear liquid. Eu in the obtained supernatant 2+ and Pb 2+ The concentration was detected, and the Eu 2+ The concentration is 0.055mg / L, Pb 2+ The concentration is 0.052mg / L.

[0033] (2) Take the magnesium hydroxide slurry obtained in step (1) and place it in a stainless steel container, add 10 mL of deionized water for stirring, seal the container and feed carbon dioxide gas, keep the container pressure at 0.5 Mpa, and react for 12 hours. Magnesium hydroxide in excess CO 2 In the presence of water and water, the reaction generates soluble magnesium bicarbonate, which is transferred from th...

Embodiment 3

[0037] Magnesium hydroxide on Sn in water 2+ / Fe 3+ adsorption separation

[0038] (1) Take the Sn with a concentration of 100mg / L 2+ Solution 50mL and concentration of 100mg / L Fe 3+ 50 mL of the solution was mixed, and 50 mg of magnesium hydroxide was added to the mixture, stirred with a stirrer for 12 hours, and then centrifuged to obtain magnesium hydroxide slurry and a treated clear liquid. Sn in the resulting supernatant 2+ and Fe 3+ Concentration was detected, the measured Sn 2+ The concentration is 0.024mg / L, Fe 3+ The concentration is 0.015mg / L.

[0039] (2) Take the magnesium hydroxide slurry obtained in step (1) and place it in a stainless steel container, add 10 mL of deionized water for stirring, seal the container and feed carbon dioxide gas, keep the container pressure at 0.5 Mpa, and react for 12 hours. Magnesium hydroxide in excess CO 2 In the presence of water and water, the reaction generates soluble magnesium bicarbonate, which is transferred from t...

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PUM

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Abstract

The invention belongs to the technical filed of sewage processing, and discloses a method for separating and recovering multiple cation heavy metals in water through phase-transition regulation and control. According to the invention, a nano adsorption material is added in sewage containing a plurality of cation heavy metals for adsorption, the absorbed slurry and water are added in a reactor, CO2 gas is introduced under enclosed and stirring condition for a reaction, the nano adsorption material can generate soluble bicarbonate which is transferred from a solid phase to a solution phase, then the soluble bicarbonate is transferred to solid phase carbonate or subcarbonate through heating, and the material is subjected to calcining or dried grinding to obtain the regenerated nano adsorption material. At the same time, multiple cation heavy metals and CO2 and water are subjected to a reaction to generate insoluble precipitate, and a mineralizer is added for a hydrothermal reaction to realize separation. In the method, a consumption material is carbon dioxide, novel impurity is not introduced, and the enrichment recovery of the multiple cation heavy metals and regeneration reuse of the nano adsorption material are realized.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for phase transition control, separation and recovery of various cationic heavy metals in water. Background technique [0002] In the past ten years, the development and expansion of industrialization has brought huge social wealth to our country. At the same time, the massive discharge of pollutants has caused serious pollution to the environment and caused many environmental hazards. For example, the copper industry pollution in Jiangxi Province reported in 2012 caused water and soil pollution due to the massive discharge of sewage containing heavy metals, which threatened the health of more than 400,000 local residents and caused adverse social impacts; It was reported in 2012 that children’s blood lead exceeded the standard in Dongtang Town, Renhua County, Shaoguan City, Guangdong Province. The blood lead of 159 children exceeded 100 micrograms p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F101/20
CPCC02F1/281C02F2101/20C02F2303/16
Inventor 刘学明林璋刘炜珍邓洪莫晓峰
Owner SOUTH CHINA UNIV OF TECH
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