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A Cascade Adsorption and Recovery Method for Heavy Metals in Wastewater Based on Magnetic Titanium-Containing Minerals/Humic Acid Composite Adsorption Material

A technology of composite adsorption material and recovery method, which is applied in the field of heavy metal wastewater treatment, can solve the problems of high operation cost of adsorption process, difficult regeneration of adsorption material, difficult recycling of heavy metals, etc., achieves advanced treatment and resource utilization, and is easy to elute Recycling, low cost effect

Active Publication Date: 2022-05-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional adsorption method is often not selective for the adsorption of heavy metal ions, which makes it difficult to recycle the heavy metals adsorbed on the adsorption material.
At the same time, it is difficult to regenerate the adsorption material, resulting in high operating costs for the adsorption process.

Method used

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  • A Cascade Adsorption and Recovery Method for Heavy Metals in Wastewater Based on Magnetic Titanium-Containing Minerals/Humic Acid Composite Adsorption Material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The magnetic titanium-containing mineral / humic acid composite adsorption material used in this example is prepared by the following method:

[0056] (1) Get 1000g of vanadium-titanium magnetite and put it into a nano-sand mill, grind it for 3 hours, and obtain a finely ground vanadium-titanium magnetite particle with a median particle size of 200nm, and use 10 liters of 0.1mol / L nitric acid to activate it by pickling , the activation process is a stirring reaction for 3 hours, after which, 1 liter of 0.5mol / L magnesium chloride solution is added, ball milled for 20 minutes, the surface of the vanadium-titanium magnetite particles is mineralized, and finally the vanadium-titanium magnetite matrix particles are obtained by drying.

[0057] (2) Put 1000g of vanadium-titanium-magnetite matrix particles into 500 liters of 200mg / L humic acid solution, and the pH value is controlled at 2. The turbid solution of humic acid and vanadium-titanium magnetite particles was stirred a...

Embodiment 2

[0064] The magnetic titanium-containing mineral / humic acid composite adsorption material used in this example is prepared by the following method:

[0065](1) Get 1000g of vanadium-titanium magnetite and put it into a nano-sand mill, grind it for 3 hours, and obtain a finely ground vanadium-titanium magnetite particle with a median particle size of 200nm, and use 10 liters of 0.1mol / L nitric acid to activate it by pickling , The activation process was a stirring reaction for 3 hours. After that, add 1 liter of 0.5mol / L magnesium chloride solution, ball mill for 20 minutes, mineralize the surface of the vanadium-titanium magnetite particles, and finally dry to obtain the vanadium-titanium magnetite matrix particles.

[0066] (2) Put 1000g of vanadium-titanium-magnetite matrix particles into 500 liters of 200mg / L humic acid solution, and the pH value is controlled at 2. The turbid solution of humic acid and vanadium-titanium magnetite particles was stirred at 25°C for 24 hours....

Embodiment 3

[0074] The magnetic titanium-containing mineral / humic acid composite adsorption material used in this example is prepared by the following method:

[0075] (1) Get 1000g of vanadium-titanium magnetite and put it into a nano-sand mill, grind it for 3 hours, and obtain a finely ground vanadium-titanium magnetite particle with a median particle size of 200nm, and use 10 liters of 0.1mol / L hydrochloric acid to activate it by pickling , The activation process was a stirring reaction for 3 hours. After that, add 1 liter of 0.5mol / L calcium chloride solution, ball mill for 20 minutes, mineralize the surface of the vanadium-titanium magnetite particles, and finally dry to obtain the vanadium-titanium magnetite matrix particles.

[0076] (2) Put 1000g of vanadium-titanium-magnetite matrix particles into 500 liters of 200mg / L humic acid solution, and the pH value is controlled at 2. The turbid solution of humic acid and vanadium-titanium magnetite particles was stirred at 25°C for 24 h...

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Abstract

The invention discloses a method for cascade adsorption and recovery of heavy metals in wastewater based on magnetic titanium-containing mineral / humic acid composite adsorption materials. The method utilizes the selective adsorption of different heavy metal ions by the magnetic titanium-containing mineral / humic acid composite adsorption material at different pH values, and achieves the purpose of stepwise adsorption and recovery of various heavy metal ions in the wastewater by controlling the pH value of the wastewater. , this method can not only efficiently remove heavy metal ions in wastewater, but also can separate and recycle different heavy metal ions in wastewater in steps. The acidic wastewater after cascade adsorption treatment can be discharged up to the standard, reducing the cost of wastewater treatment.

Description

technical field [0001] The invention relates to a heavy metal wastewater treatment method, in particular to a method for cascade adsorption and recovery of heavy metals in wastewater based on a magnetic titanium-containing mineral / humic acid composite adsorption material, and belongs to the technical field of heavy metal pollution prevention and control. Background technique [0002] Most of the wastewater discharged from mining, smelting, chemical and other industries contains a variety of heavy metal ions such as chromium, copper, lead, zinc, cadmium, mercury, etc. Most of these wastewater are strongly acidic, and direct discharge will cause huge damage to the natural environment and human health. hazards. Heavy metal ions are not easy to transform in the natural environment, and are easy to accumulate in animals and plants, causing chronic poisoning. As long as there are traces of heavy metals in natural water, toxic reactions can occur. Generally, the range of toxicity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/28C22B7/00B01J20/02B01J20/32C02F101/20C02F101/22
CPCC02F1/66C02F1/288C22B7/006B01J20/0211B01J20/24B01J20/28009C02F2301/08C02F2101/20C02F2101/22C02F2303/16Y02P10/20
Inventor 张元波路漫漫苏子键姜涛李光辉范晓慧黄柱成刘硕刘继成涂义康王嘉
Owner CENT SOUTH UNIV