Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for treating titanium or titanium alloy pickling waste liquid by capacitive deionization technology

A capacitive deionization and technical treatment technology, which is applied in the field of capacitive deionization technology to treat titanium or titanium alloy pickling waste liquid, can solve the problems of pollution, energy consumption and evaporation speed mutual restriction, increase alkali consumption, etc., and achieve process controllability. Strong performance, good adsorption effect, good adjustment effect

Active Publication Date: 2022-04-15
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the alkali neutralization method has serious pollution and increases the consumption of a large amount of alkali; the complexation precipitation method has problems such as low selectivity of reagents (complexing agents) and large consumption, and the equipment occupies a large area.
Some studies have proposed to use the extraction method to treat the pickling waste liquid, but there are disadvantages such as complicated operation and extraction efficiency that cannot meet the production requirements; there is also a vacuum evaporation recovery method to treat the pickling waste liquid, but this method has the problem of evaporating the bottom liquid in the application. It cannot be processed, energy consumption and evaporation speed are mutually restricted, and the material of the evaporator is difficult to solve, which limits its practicality; researchers propose membrane separation methods (dialysis, electrodialysis, reverse osmosis, etc.) to treat pickling waste liquid, which is This method is simple to operate, but the disadvantage is that too many impurities in the acid solution will block the dialysis membrane, the recovered acid concentration is not high but the energy consumption is high, and the membrane fouling will easily cause secondary pollution to the environment during the operation of the device, which limits its use. in industrial production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for treating titanium or titanium alloy pickling waste liquid by capacitive deionization technology
  • A method for treating titanium or titanium alloy pickling waste liquid by capacitive deionization technology
  • A method for treating titanium or titanium alloy pickling waste liquid by capacitive deionization technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 100 mL of titanium plate pickling waste liquid into the adsorption tank, and stir on a constant temperature magnetic stirrer (at room temperature). Then, the polyaniline / graphite composite electrode and the graphite electrode, graphite electrode and graphite electrode were respectively fixed at both ends of the adsorption tank, the distance between the two electrodes was 1 cm, and the power supply (1.2 V) was turned on. The adsorption time is 18min to 20min, and the conductivity and pH value of the solution are measured every 1min.

[0032] The conductivity and pH of spent acid in the CDI process vary with time. figure 1 and figure 2 shown. It can be seen from the figure that when waste acid is treated with graphite-graphite electrode, the concentration of waste acid decreases by 4.66%, and the pH value increases by 14.30%; when waste acid is treated with polyaniline / graphite-graphite electrode, its concentration decreases by 10.13% %, the pH value of spent acid...

Embodiment 2

[0034] Add 100 mL of titanium plate pickling waste liquid into the adsorption tank, and stir on a constant temperature magnetic stirrer (at room temperature). Then, the polyaniline / graphite composite electrode and the graphite electrode were respectively fixed on both ends of the adsorption tank, the distance between the two electrodes was 1 cm, and the power supply (1.2V-1.4V) was turned on. The adsorption time was 18 minutes, and the conductivity and pH value of the solution were measured every 1 minute.

[0035] During the experiment, the conductivity and pH value of the solution change with time as shown in image 3 and Figure 4 shown. It can be seen from the figure that under the operating voltages of 1.2V, 1.3V and 1.4V for the polyaniline / graphite electrode, the conductivity of the waste acid is reduced, that is, the concentration of the waste acid is reduced, and the calculated concentration of the waste acid is respectively reduced by 12.45%. , 16.32% and 15.86%; ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for applying capacitive deionization (CDI) technology to treat titanium or titanium alloy pickling wastewater, and belongs to the technical field of environmental cleaning and resource recovery and reuse. The method comprises the following steps: using the polyaniline / graphite composite electrode and the graphite electrode as cathode and anode respectively to form a CDI electrode unit; placing the CDI electrode unit in the solution to be adsorbed, turning on the power, stirring the solution, and starting the adsorption process; After the adsorption, reverse the polarity of the electrode, place the CDI electrode unit in deionized water, and carry out the desorption process. The invention is based on the CDI technology applied to the adsorption process of titanium or titanium alloy pickling waste liquid, and achieves good adsorption effect; the invention regenerates the CDI electrode and enriches and recovers titanium ions by reversing the electrode polarity.

Description

technical field [0001] The invention belongs to the technical field of metal or metal alloy pickling waste liquid treatment, in particular to a method for treating titanium or titanium alloy pickling waste liquid by capacitive deionization technology. Background technique [0002] Pickling is one of the key steps in the production process of titanium and titanium alloy materials. Dip pickling and spray pickling are commonly used. Commonly used acids are sulfuric acid, nitric acid, phosphoric acid, hydrochloric acid or mixed acids. The pickling process of titanium and titanium alloys often uses a mixed liquid of nitric acid (25% to 35%) and hydrofluoric acid (5% to 10%), of which hydrofluoric acid is the main corrosion component. If the waste acid produced by pickling is discharged directly, 60% to 90% of nitric acid will be discharged, and more than 20% of hydrofluoric acid will be discharged, which will not only cause serious environmental pollution, but also waste resource...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F103/16
CPCC02F1/4691C02F2103/16C02F2303/14
Inventor 张玉洁薛娟琴李飞马晶
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY