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Method for electrodepositing zinc and zinc alloy at low temperature by ionic liquor

A technology of ionic liquid and electrodeposition, which is applied in the fields of improving process efficiency, photographic technology, instruments, etc., can solve problems such as unfriendly environment, lower production cost, and pollute the environment

Inactive Publication Date: 2012-06-27
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address some problems in the current industrial electrodeposition production of zinc and zinc alloys, such as high energy consumption, environmental unfriendliness, corrosion equipment, high cost, environmental pollution, etc., to propose a method of using ionic liquids for electrodeposition production. The method of zinc and zinc alloy, the method has low operating temperature, less energy consumption, and less corrosion to equipment, which will greatly reduce production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Low temperature electrodeposited zinc

[0023] Weigh a certain amount of chlorinated 1-ethyl-3-methylimidazole [Emim]Cl, heat it in a constant temperature oil bath at 80°C, and after it is completely dissolved, add zinc chloride ZnCl 2 Dissolved in the ionic liquid, according to the molar ratio of 1:1 zinc chloride ZnCl 2 Dissolved in ionic liquid, with two parallel pieces of high-purity graphite as the anode, with a solid zinc cathode in the middle, the pole distance is 15mm, the electrodeposition temperature is 80°C, at a constant potential of -0.5V, at 8A / m 2 Under constant current electrolysis for 0.5h at a certain current density, chlorine gas is produced at the anode, solid zinc is precipitated at the cathode, and the current efficiency is 70%.

Embodiment 2

[0025] Low temperature electrodeposited zinc

[0026] Weigh a certain amount of 1-butyl-3-methylimidazolium chloride [Bmim]Cl, heat it in a constant temperature oil bath at 80°C, and after it completely melts, mix zinc chloride ZnCl with a molar ratio of 1:2 2 Dissolve in ionic liquid, heat in a constant temperature oil bath to keep the temperature at 80°C, and prepare an electrolyte; use two parallel pieces of high-purity graphite as anodes, the middle is a solid zinc sheet cathode, the pole distance is 40mm, and the electrodeposition temperature is 60°C. -0.5V, 5A / m 2 Under constant current electrolysis for 0.5h at a certain current density, chlorine gas is produced at the anode, and solid zinc is precipitated at the cathode.

Embodiment 3

[0028] Low temperature electrodeposited zinc

[0029] Take a certain amount of TMBAC (benzyltrimethylammonium chloride), and zinc chloride ZnCl 2 Add it into the ionic liquid, heat it in a constant temperature oil bath to keep the temperature at 120°C, and prepare the electrolyte; use two parallel pieces of high-purity graphite as the anode, the middle is a solid zinc sheet cathode, the pole distance is 30mm, and the electrodeposition temperature is 120°C. -1.2V, 6A / m 2 Under constant current electrolysis for 0.5h at a certain current density, chlorine gas is produced at the anode, and solid zinc is precipitated at the cathode.

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Abstract

The invention discloses a method for electrodeposit zinc and zinc alloy at low temperature by ionic liquor, which includes the following steps of 1) dissolving zinc chloride ZnCl2, or zinc chloride ZnCl2 and alloying element chloride MeCln into mixed ionic liquor to prepare electrolyte; 2) utilizing high-purity graphite as an anode and solid zinc or metallic copper as a cathode to realize direct-current electrodeposition; 3) arranging the anode and the cathode into an electrodepositing tank vertically; 4) controlling constant potential, cathode-current density, electrode distance and electric depositing temperature; and 5) generating chlorine gas at the anode and separating solid zinc from the cathode. During electrodeposition, the voltage of the electrodepositing tank is higher than higher decomposition voltage in zinc chloride or alloying element chloride while lower than that of an electric chemical window of the ionic liquor, zinc or zinc alloy is produced on the cathode, and the chlorine gas is discharged from the anode. The ionic liquor is light in weight, non-toxic, excellent in conductivity, high in heat stability, low in melting point, high in boiling point, wide in the electric chemical window and capable of alleviating corrosion to the electrode materials and tank liners, can be recycled and has no volatility or flammability.

Description

technical field [0001] The invention belongs to the field of chemical, chemical and metallurgy, and in particular relates to a method for producing zinc and zinc alloys by using ionic liquid low-temperature electrodeposition. Background technique [0002] my country is the country with the largest zinc reserves. Since 1992, my country's zinc production has ranked first in the world. Modern zinc smelting methods are divided into two categories: pyro-method zinc smelting and hydro-method zinc smelting. Among them, due to the comprehensive utilization of zinc hydrometallurgy resources, relatively low unit power consumption, and high environmental friendliness, it has become the mainstream of zinc metallurgical technology development. Electrodeposition of zinc is the last process of zinc hydrometallurgy. In the electrodeposition of zinc, due to the existence of hydrogen evolution reaction, the current efficiency is reduced, the unit consumption of electric energy is increased,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16C25C1/24
CPCY02P10/20
Inventor 马梅彦
Owner IRICO
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