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Method for treating heavy metal wastewater through ion flotation of nano collecting agent

A technology for collectors and heavy metals, which is applied in the fields of flotation water/sewage treatment, flotation, chemical instruments and methods, etc., can solve the problems of high cost, large consumption, removal rate of heavy metal ions in secondary pollution, etc., and achieves easy operation. , Small footprint, significant effect

Active Publication Date: 2019-10-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the current problems of large amount of ion flotation collectors, high cost, possible secondary pollution, and low removal rate of heavy metal ions, the present invention proposes a method for treating heavy metal wastewater by ion flotation with nano-collectors

Method used

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Examples

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Effect test

Embodiment 1

[0029] A method for treating lead ions in heavy metal wastewater by ion flotation with nano-collectors, the specific process is as follows:

[0030] Add 250mL of lead ion solution with a concentration of 10ppm into an ion flotation device with a flotation cell of 250mL, adjust the pH of the solution to 4.0, and add a certain amount of graphene oxide as a nano-collector to control the concentration of graphene oxide in the mixed solution. Concentration is 0.5mg / L, stir at 1800rpm for 5min; then, add flocculant emulsified kerosene with D90 of 0.1μm, the amount of emulsified kerosene added is 20mg / L, keep stirring for 3min; then, add foaming agent pine at 10mg / L Alcohol oil, continue to stir for 3 minutes; finally, flotation for 5 minutes under the aeration rate of 0.6L / min, the turbidity of the tail liquid is 3.9 NTU, and the residual concentration of lead ions in the tail liquid is 0.2 mg / L, reaching the industrial standard. Wastewater discharge standards.

Embodiment 2

[0032] A nano-collector ion flotation method for treating copper ions in heavy metal wastewater, the specific process is as follows:

[0033]Add 250mL of copper ion solution with a concentration of 500ppm into an ion flotation device with a flotation cell of 250mL, adjust the pH of the solution to 6.5, and add a certain amount of graphene oxide as a nano-collector to control the concentration of graphene oxide in the mixed solution. Concentration is 1.0mg / L, stir at 1800rpm for 5min; then, add flocculant emulsified kerosene with D90 of 2.0μm, the amount of emulsified kerosene added is 100mg / L, keep stirring for 3min; Foaming agent pine alcohol oil, continue to stir for 3 minutes; Finally, flotation for 7 minutes under the aeration rate of 1.1L / min, the turbidity of the tail liquid recorded is 2.2 NTU, and the residual concentration of copper ions in the tail liquid is 0.8mg / L, It has reached the discharge standard of industrial wastewater.

[0034] Under the condition that ot...

Embodiment 3

[0036] A nano-collector ion flotation method for treating zinc ions in heavy metal wastewater, the specific process is as follows:

[0037] Add 250mL of zinc ion solution with a concentration of 2000ppm into an ion flotation device with a flotation cell of 250mL, adjust the pH of the solution to 7.0, and add a certain amount of graphene oxide as a nano-collector to control the concentration of graphene oxide in the mixed solution. The concentration is 2.0mg / L, stirring at 1800rpm for 5min; then, add flocculant emulsified kerosene with a D90 of 0.1μm, the amount of emulsified kerosene added is 20mg / L, and keep stirring for 3min; Foaming agent pine alcohol oil, continue to stir for 3min; Finally, flotation 10min under 1.5L / min, the turbidity that records tail liquid is 1.3NTU, and the residual concentration of zinc ion in tail liquid is 0.4mg / L, It has reached the discharge standard of industrial wastewater.

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Abstract

The invention discloses a method for treating heavy metal wastewater through ion flotation of a nano collecting agent. The method comprises the following steps that a certain quantity of a graphene oxide solution is added into a flotation tank containing the heavy metal wastewater (pH is within 4 to 8) to serve as the ion flotation nano collecting agent, and stirring for reaction is conducted; then, a certain amount of emulsified kerosene is added as a flocculating agent, and stirring is conducted continuously; then, a certain amount of terpenic oil is added as a foaming agent, and stirring isconducted continuously; and finally, inflating is conducted, under hydrophobic acting force, metal pollutant loaded graphene oxide adheres to bubbles and floats upwards to be gathered on a foam layeron the liquid level upper layer to overflow, and thus removing of heavy metal ions and water purifying are realized. The treated wastewater reaches the national industrial wastewater discharging standards. The method is easy and convenient to operate, small in occupied area, low in energy consumption, high in concentration ratio and small in sludge quantity, and has certain industrial value and social benefits.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a method for treating heavy metal wastewater by ion flotation of a nano-collector. Background technique [0002] Studies on the treatment of sewage containing heavy metal ions by ion flotation have been reported. For example, in "A chelating metal ion flotation agent, its preparation method and its application method" (CN106238010A), Han Guihong et al. synthesized a flotation agent using cyclodextrin, sodium hydride and succinic anhydride as raw materials through a two-step method. A chelating type metal ion flotation reagent is applied to metal ion flotation, and shows a good removal effect on metal ions. In "A Flocculation Flotation Equipment for Sewage Treatment" (CN205892794U), Sun Yajie added a flotation column to the flocculation flotation equipment, so that the formation of bubbles, the collision and contact between bubbles and flocs are in regular swirl, It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/02B03D1/002C02F1/24C02F101/20B03D101/02
CPCB03D1/002B03D1/02B03D2201/02B03D2203/008C02F1/24C02F2101/20
Inventor 彭伟军曹亦俊常鲁平范桂侠李超黄宇坤
Owner ZHENGZHOU UNIV
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