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A method for separating and recovering heavy metal anions and cations in water by phase change regulation

A technology for separation and recovery of heavy metals, applied in separation methods, filtration separation, chemical instruments and methods, etc., to achieve the effects of simple equipment, low cost, and ideal environment

Active Publication Date: 2020-04-28
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

[0022]Magnesium hydroxide on Al in water 3+ / Fe 3+ / CrO 4 2- adsorption separation

[0023] (1) Take Al with a concentration of 50mg / L 3+ Solution 50mL, Fe concentration of 50mg / L 3+ Solution 50mL and concentration of 50mg / L CrO 4 2- 50 mL of the solution was mixed, and 75 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. CrO in the obtained supernatant 4 2- 、Al 3+ and Fe 3+ The concentration was detected, and the CrO 4 2- The concentration is 0.21mg / L, Al 3+ The concentration is 0.10mg / L, Fe 3+ The concentration is 0.03mg / L.

[0024] (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 prese...

Embodiment 2

[0029] Magnesium hydroxide to CrO in water 4 2- / Cu 2+ adsorption separation

[0030] (1) Take CrO with a concentration of 50mg / L 4 2- Solution 50mL and Cu concentration of 50mg / 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. CrO 4 2- and Cu 2+ The concentration was detected, and the CrO 4 2- The concentration is 0.17mg / L, Cu 2+ The concentration is 0.08mg / L.

[0031] (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 the solid phase to the ...

Embodiment 3

[0035] Magnesium hydroxide to CrO in water 4 2- / Fe 3+ adsorption separation

[0036] (1) Take CrO with a concentration of 50mg / L 4 2- Solution 50mL and concentration of 50mg / 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. CrO in the obtained supernatant 4 2- and Fe 3+ The concentration was detected, and the CrO 4 2- The concentration is 0.12mg / L, Fe 3+ The concentration is 0.022mg / L.

[0037] (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...

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PUM

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Abstract

The invention belongs to the technical field of sewage treatment, and discloses a method for separating and recycling heavy metal anions and cations in water through phase-change regulation and control. The method comprises the following steps: putting a nano adsorption material into sewage with heavy metal anions and cations, and performing adsorption so as to obtain nano adsorption material slurry with the heavy metal anions and cations; performing a reaction on the obtained slurry with water under CO2 pressurizing auxiliary conditions, generating soluble bicarbonate from the nano adsorption material, transferring to a solution phase from a solid phase, desorbing heavy metal anions into the solution phase, and enabling heavy metal cations to react with CO2 and water to generate insoluble precipitate; heating the solution phase to convert the nano adsorption material into carbonate or subcarbonate of the solid phase, separating the carbonate or subcarbonate from the heavy metal anions, and performing calcining or drying grinding, so as to obtain a regenerated nano adsorption material. By adopting the method, carbon dioxide is consumed as a raw material, no new impurity is introduced, and enriched recycling of heavy metal anions and cations and regenerating recycling of nano adsorption materials can be achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for phase change control, separation and recovery of heavy metal anions and cations 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 per ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/34C02F1/28C02F101/20C02F101/22
CPCB01J20/041B01J20/043B01J20/3458C02F1/281C02F2101/20C02F2101/203C02F2101/22
Inventor 林璋刘学明刘炜珍邓洪莫晓峰
Owner SOUTH CHINA UNIV OF TECH