Device and method for recovering cadmium cotton through spin current electric field enhanced replacement

An electric field and cadmium sponge technology, which is applied in the field of devices for reinforced replacement and recovery of cadmium sponge by a spin current electric field, can solve the problems of low recovery rate, increased processes, and many residues, so as to eliminate concentration polarization, improve efficiency, and promote transmission. effects of qualitative processes

Inactive Publication Date: 2021-06-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a certain effect, but it is difficult to use it on a large scale in the industry due to the cost of ultrasonic equipment and the harsh process environment.
In the design of patent 201510796081, zinc flakes were used instead of zinc powder in an attempt to solve the problem of large consumption and residual zinc powder
However, this design also leads to new problems, that is, after the reaction, the zinc flakes accumulate and solidify at the bottom of the reaction tank, which affects the continuity and thoroughness of the reaction.
In other methods, including adding organic extractant, adding other intermediate metals to participate in the reaction, etc., it is possible to introduce new elements, which will cause difficulties for the direct recovery of high-purity cadmium cotton or zinc electrowinning, and increase the process.
[0005] Generally speaking, the existing processing technology of cadmium-containing materials has complex process, long processing cycle, many types of chemical raw materials and equipment required, many intermediate by-product secondary materials, large consumption of zinc powder, and metal accumulation in the production process. Zinc and other disadvantages
In addition, problems such as cadmium leaching rate, low recovery rate, and easy dispersion and loss in the treatment and recovery process are the bottlenecks that need to be broken through in the current cadmium material treatment technology.
The existing technology usually uses the mechanism of displacement reaction and galvanic reaction to carry out various reactions to improve the treatment process, but these reactions only try to solve the problems of the existing process by changing the physical form of zinc participating in the reaction, and the effect is limited.

Method used

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  • Device and method for recovering cadmium cotton through spin current electric field enhanced replacement
  • Device and method for recovering cadmium cotton through spin current electric field enhanced replacement
  • Device and method for recovering cadmium cotton through spin current electric field enhanced replacement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The original concentration of the raw material liquid is: Zn 4g / L, Cu 6g / L, pH=2. Take 4L of the cadmium-containing zinc sulfate solution containing 2g / L of cadmium and send it to the reaction tank, and use the heating device to raise the temperature of the solution to 60°C. Add dilute sulfuric acid to adjust the pH to 2. The purity of the zinc rod anode is 99%, and the size is φ4cm×30cm. The zinc rod anode is inserted and installed on the axis of the reaction tank. The aluminum-lined cathode is cylindrical, with an inner diameter of 12cm, a length of 30cm, a thickness of 0.5cm, and a purity of 95%. The distance between the zinc rod anode and the inner wall of the aluminum-lined cathode is 10cm. Rotate the reaction tank and keep it at a speed of 10r / min for a period of time as the reaction A stage. Turn on the switch, couple the electric field for the reaction system, and set the current density to 5mA / cm 2 . Continue to allow the reaction tank to spin for a period ...

Embodiment 2

[0051] Send 4L of a solution with an original concentration of Zn 4g / L and Cu 6g / L to the reaction tank, and use a heating device to raise the temperature of the solution to 60-65°C. The purity of the zinc rod anode is 99%, and the size is φ4cm×30cm. The aluminum-lined cathode is cylindrical, with an inner diameter of 12cm, a length of 30cm, a thickness of 0.5cm, and a purity of 95%. The distance between the zinc rod anode and the inner wall of the aluminum-lined cathode is 10cm. Add dilute sulfuric acid to adjust the pH value to 2, insert and install the zinc rod anode on the axis of the reaction tank. Make the reaction tank spin at a speed of 10r / min, turn on the switch after 30 minutes, couple the electric field for the reaction system, and set the current density to 10mA / cm 2 . Continue to allow the reaction tank to spin and react for 4 hours, then stop spinning, disconnect the coupling power supply and stop heating, and empty the zinc sulfate solution from the drain por...

Embodiment 3

[0055] Send 4L of cadmium-containing zinc sulfate solution containing 2g / L of cadmium to the reaction tank, and use a heating device to raise the temperature of the solution to 50-60°C. Add dilute sulfuric acid to adjust the pH value to 2, insert and install the zinc rod anode on the shaft reaction tank body core. Make the reaction tank spin at a speed of 10r / min, turn on the switch after 10 minutes to couple the electric field of the reaction system, and set the current density to 5mA / cm 2 . Continue to allow the reaction tank to spin and react for 5 hours, then stop spinning, disconnect the coupling power supply and stop heating, and empty the zinc sulfate solution from the drain port. Continue to let the reaction tank spin at a high speed of 60r / min for 10min, centrifuge and filter to obtain cadmium cotton, and the filtrate enters the drain port and collects it. Open the reaction tank, collect the cadmium cotton on the filter bottom net, and perform cake pressing.

[005...

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PUM

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Abstract

The invention discloses a device and method for recovering cadmium cotton through spin current electric field enhanced replacement. The device comprises a reaction tank body, an aluminum lining cathode, a zinc bar anode, a filter bottom net, a coupling power source and a heating device. The method comprises the following steps that the reaction tank body is assembled, and a coupling electric field is arranged; a solution is added, and the pH value of the solution is adjusted; the solution is heated to make the temperature rise; in the A-stage reaction, the solution and a zinc bar anode are subjected to a replacement reaction in a spin current state; in the B-stage reaction, the solution and the zinc bar anode are continuously reacted in the spin current state and under the condition of coupling the electric field; centrifuging is conducted, the solution in the reaction tank body is evacuated, and the cadmium cotton is collected; By adoption of the device and method, the electrochemical reaction process is promoted by using the electric field, the mass transfer process is promoted by using the spin current relative to the cathode and the anode by spinning of the reaction tank body, continuous exposure of zinc wrapped in the cadmium cotton is promoted by using gravity and mechanical force friction, the recovering efficiency of the cadmium cotton is effectively improved, the zinc consumption is reduced, and the grade of the product cadmium cotton is increased.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a device and a method for recovering cadmium cotton by means of a spin current electric field enhanced displacement. Background technique [0002] In the hydrometallurgical industry, the replacement reaction is usually used to purify the electrolyte or recover the target metal. This type of replacement reaction mainly involves the reduction of a metal with a lower potential from ion to elemental substance after oxidation of a metal with a higher potential. For example, in the production process of non-ferrous metals such as lead-zinc smelting and cobalt-nickel smelting, this reaction mechanism is usually used to purify and remove impurities. [0003] In the actual production process of zinc smelting industry, the reaction process is often realized by directly adding zinc powder and mechanical stirring. In the zinc powder replacement reaction, the stirring speed has a gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/02C22B3/46C22B17/00C25F1/04C25F7/00
CPCC22B3/02C22B3/46C22B17/04C25F1/04C25F7/00Y02P10/20
Inventor 曾伟志丁文杰晏阳郭文香胡辉伍琳陈冰鑫
Owner CENT SOUTH UNIV
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