6 results about "Zinc electrowinning" patented technology

This invention discloses a method for preparing a low-silver-doped lead-silver alloy anode material. The method includes first smelting a lead-silver master alloy, adding melted silver to molten lead, and using electromagnetic and mechanical stirring to ensure uniform alloy composition. During casting and solidification, ultrasonic external field strengthening technology is employed to produce the lead-silver master alloy. Then, the lead-silver master alloy and rare earth modifier are added to the molten lead, along with a dispersant and antioxidant. The metal smelting temperature is controlled between 380℃ and 520℃, and the smelting time is 0.5 h. Electromagnetic and mechanical stirring techniques are used to ensure uniform alloy composition distribution. After casting and solidification, a blank for producing lead-silver alloy anode plates is finally obtained. This method is applied to the production of anode plates for zinc electrowinning.

This invention discloses a method for improving the electrochemical performance of lead alloy anodes using rare earth elements. The method includes first melting a rare earth alloy in a vacuum furnace, adding lanthanum (La), cerium (Ce), and neodymium (Nd) while using electromagnetic stirring, controlling the temperature at 850℃~1030℃ for 0.5-1 h. Next, the rare earth alloy concentration is diluted ≤10 times, and dispersants and antioxidants are added. Mechanical stirring combined with electromagnetic stirring is used to ensure uniform elemental composition, controlling the temperature at 500℃~550℃ for 0.5 h to prepare a rare earth master alloy. Then, 5% of the rare earth master alloy, 1% of a lead-calcium alloy, and 1% of a lead-strontium alloy are sequentially added to the molten lead, along with an antioxidant. Mechanical stirring combined with electromagnetic stirring is used to ensure uniform microstructure and composition, controlling the temperature at 450℃~500℃ for 0.5 h to finally obtain a rare earth lead alloy. This method can be applied to the production of anode plates for zinc electrowinning.

This invention provides a corrosion simulation method for aluminum cathode plates used in zinc electrowinning, comprising: step S1, preparing a simulation electrolyte, wherein the concentration of H2SO4 in the simulation electrolyte is 180 g / L to 300 g / L, and Cl... ‑ The concentration is 400 mg / L~1000 mg / L; Step S2, using an aluminum cathode plate as the cathode, and with a current of 400 A / m 2 ~750A / m 2 The working current is subjected to constant current polarization treatment for 1 to 8 hours, after which the current is disconnected and the plate is left to stand. Step S3 is repeated 6 to 10 times from step S2 until the aluminum cathode plate fails. This invention is based on a high-acid, high-chlorine simulated electrolyte system and controls the cathode reaction kinetics through constant current polarization; and simulates zinc deposition-stripping conditions through periodic energization-open circuit cycles, thereby achieving the technical effect of rapid, repeatable, and multi-dimensional evaluation of the corrosion resistance and service life of aluminum cathode plates.

The application discloses modified kaolinite, a preparation method thereof and application of the modified kaolinite in fluoride removal. The modified kaolinite is obtained by mixing and calcining kaolinite after carboxyl treatment. The modified kaolinite can be added into a strong-acid fluorine-containing sulfate solution for adsorption, and the modified kaolinite can preferentially act on fluoride in the solution and weakly act on sulfate ions, so that selective removal of the fluoride is realized. The modified kaolinite is suitable for removal of the fluoride in a strong-acid sulfate system such as electrolytic zinc, and has the characteristics of simple process and strong adaptability.

1. The name of the design product: zinc electrode plate vertical packaging frame for electrodeposition. 2. The use of the design product: the design product is a zinc electrode plate vertical packaging frame for electrodeposition, used for packaging electrode plates. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The application discloses a method for zinc electrodeposition in a low-concentration manganese ion system, and realizes the effect of efficiently inhibiting anode mud in the low-concentration manganese ion system. The MnO2-based film generated in advance on the anode surface is dense and firmly attached, can effectively isolate the corrosion of the electrolyte to the anode, and reduces the generation of anode mud such as PbO2 and PbSO4; meanwhile, the low-manganese electrolyte environment greatly reduces the excessive deposition rate of MnO2, avoids the formation of a loose and falling layer, significantly reduces the anode mud deposition amount, and further reduces the anode mud yield. Therefore, the probability of the cathode zinc product being polluted by the anode mud is reduced, and the product quality is guaranteed; the anode corrosion is slowed down, the service life of the anode is prolonged, the cell voltage loss is reduced, and the current efficiency is improved. The reduction of the anode mud deposition amount also significantly prolongs the anode cleaning period, improves the production continuity and the equipment utilization rate. In addition, the low-manganese operation reduces the consumption of manganese salt and the output of manganese-containing solid waste, and the process economy and environmental protection are significantly improved.