Copper rice, electrolytic copper, bare copper wire are the raw materials for the preparation of electrolyte, in addition, as the raw materials for the preparation of electrolyte, the purity must meet the requirements of the first notice of the national standard GB4667-1997 "electrolytic cathode copper", that is to say, as the raw materials for electrolyte weighing, these raw materials must contain copper purity of more than 90%. In order to meet the quality requirements of copper foil products. In addition, sulfuric acid is also an essential material in the process of electrolyte preparation, the purity and quality of raw materials to a large extent affect the manufacturing quality of copper foil, so the relevant staff are required to carry out purity testing and analysis of these raw materials to ensure that the raw materials used in the preparation of electrolytic copper foil meet national standards.

In the first process, the relevant staff need to prepare the batching equipment are copper foil machine, high tank, stock liquid storage tank, copper dissolving tank, weighing control system and heat exchanger. The raw materials, sulfuric acid, water and compressed air are quantitatively controlled by the weighing module according to a certain proportion into the dissolved copper tank, which can also be controlled by the automatic control system. The weighing module is installed at the leg or ear. In order to reduce the weighing error, the weighing liquid is generally sent to the dissolved copper tank through a soft connection to reduce the impact force. The dissolved copper tank should avoid vibration when weighing and feeding, and cannot be stirred, otherwise the weighing is not accurate. Weighing copper dissolving tank can also be prepared according to the need of liquid level device or flow device, double metering, more accurate. The selection of the weighing sensor range is based on the quality of the dissolved copper tank and the total quality of the materials filled in the tank. The weighing module is controlled by the LCD touch screen and PLC controller on the electric control box, which can output the instantaneous weight and cumulative weight and can be cleared. And under the joint action of the high tank and the foil making machine, the combined material is sent to the stock liquid storage tank, and the high purity electrolyte can be obtained after the activated carbon filtration. In addition, the compound needs to be heated and further mechanical filtration until the purity of the electrolyte reaches the national standard of chemical purity. In the second kind of electrolyte metering process, it is also necessary to make copper foil machine, high tank, stock liquid storage tank, dissolved copper tank and heat exchanger. However, there are obvious differences in the steps. First, raw materials, water, compressed air and sulfuric acid are added to the dissolved copper tank, and then mechanically filtered directly into the electrolyte irrigation. Different from the first process, the weighing process of the electrolyte is basically completed in the electrolyte irrigation, which is heated by the high tank and filtered by activated carbon, so that the raw materials can be recycled and filtered. The purity of the electrolyte is continuously increased until the purity meets the manufacturing requirements of the electrolytic copper foil electrolyte.

Since the production mechanism of each copper foil is the same, it requires copper solution, solid particles, and temperature adjustment to finally form an electrolyte that meets the quality standard. The electrolyte Weighing system is to put the pre-treated copper material into the dissolved copper tank, and add compressed air to the copper tank. Under continuous heating, the copper material will oxidize and generate copper sulfate solution.

The copper sulfate solution is mixed with the copper lean electrolyte, and after a certain time of temperature adjustment and mechanical filtration, the compound is sent to the high tank. In fact, the electrolyte is recycled in the production process, on the one hand, in order to improve the purity of the electrolyte itself, through continuous filtration, continuous composition adjustment, so that it can meet the subsequent production of copper foil products. On the other hand, recycling can make full use of the adsorption function of activated carbon, remove organic matter in the electrolyte, and make the electrolyte reach the technical indicators in terms of temperature and concentration.

The auxiliary conditions for electrolyte preparation refer to the supporting conditions for electrolyte preparation, including compressed air supply, steam supply and sulfuric acid supply. Sulfuric acid is a consumable material in the production process of electrolytic copper foil electrolyte, so it is necessary to appropriately increase sulfuric acid solution in the circulation treatment of electrolyte. Because the quality of sulfuric acid will have a greater impact on the appearance of copper foil products, so the relevant staff need to prepare a chemically pure sulfuric acid solution (purity ≥95% or more), it is particularly important to note that sulfuric acid is highly corrosive, the container of sulfuric acid is best to choose acid-resistant plastic or 316L stainless steel welded container to prevent sulfuric acid leakage.