Color-coated Aluminum Coil is to paint and color the surface of aluminum substrate. Commonly used are fluorocarbon color-coated aluminum coil and polyester color-coated aluminum coil. panels, aluminum ceilings, cans, electronics.
Color-coated aluminum coil coating is divided into: polyester coated aluminum coil (PE), fluorocarbon coated aluminum coil (PVDF). The solid film has protective decorative properties. It is a kind of anti-UV ultraviolet coating. The polyester resin uses the polymer containing ester bonds in the main chain as the monomer, and adds the alkyd resin. The ultraviolet absorber can be divided into matt and high-gloss series according to the gloss. It can give colorful aluminum products rich colors, and has good gloss and smoothness, as well as superior texture and feel, and can also increase the sense of hierarchy and three-dimensionality. It can protect objects exposed to the atmosphere and attacked by ultraviolet radiation, wind, rain, frost and snow; due to temperature difference, freeze-thaw cycles, corrosive gases and microorganisms, the coating can play a protective role. Especially suitable for interior decoration and advertising boards.
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1. The concentration of gold in the electrolyte The concentration of gold in the electrolyte determines the number of gold cyanide ions diffused into the surface of the cathode, thus causing a low concentration of gold, a slower deposition rate of gold, a low recovery rate of gold, and a current efficiency of electrolysis. Reduced. When the gold concentration is from 50 mg / liter to 3.8 mg / liter, the deposition rate of gold is reduced from 0.7 mg / min to less than 0.1 mg / min, the recovery of gold is reduced from 92% to 74%, and the current efficiency is reduced by 6.3%. To 0.47%.
2. Sodium hydroxide concentration in the electrolyte Sodium hydroxide in the electrolyte can strengthen the electrolysis, especially when the concentration of cyanide ions is low. As the concentration of sodium hydroxide in the electrolyte increases, the deposition rate of gold increases and the recovery rate of gold increases.
3. Electrolyzer feed rate increases When the feed rate increases, the gold deposition rate will increase, but the gold recovery rate will decrease.
4. Cathode surface area When the surface area of ​​the cathode is increased, the contact surface between the gold cyanide ion and the cathode is enlarged, which is beneficial to accelerate the deposition of gold and improve the recovery rate of gold.
5. Stir the electrolyte The stirring of the electrolyte can cause the turbulent flow of the electrolyte to make the diffusion layer on the cathode surface thinner, reduce the concentration polarization, and improve the deposition rate of gold.
6. Slot voltage When the cell voltage rises, the deposition rate of gold will increase, but the current efficiency will decrease. This is the result of the decomposition of water caused by the increase of the cell voltage and the accumulation of other impurities in the electrolyte.
7. Temperature Increase the temperature of the electrolyte to increase the conductivity of the electrolyte, accelerate the diffusion of gold cyanide ions, accelerate the deposition rate of gold, and increase the recovery rate of gold. But too high a temperature will worsen working conditions.
Main factors affecting the electrowinning process
The main factors affecting the electrowinning process are: