Combined electrolytic cathode plate

Abstract

The invention discloses a combined electrolysis cathode plate which comprises an electrolysis cathode plate and a conductive connecting piece, and is characterized in that the electrolysis cathode plate comprises an electrolysis mother plate, a plurality of electrolysis unit plates and connecting mechanisms thereof, wherein, the electrolysis mother plate is in a plane structure, and the upper endof the mother plate is connected with a conductive connecting structure; the connecting mechanism is arranged on the surface of the electrolysis mother plate; the electrolysis unit plates are frame plates which are applicable to paste application and removing devices with surface area smaller than that of the electrolysis mother plate; the electrolysis unit plates are movably arranged on the electrolysis mother plate by the connecting mechanisms, to form a large removable combined electrolysis cathode plate. The combined electrolysis cathode plate of the invention can not only meet the requirements for the mechanical operation during paste application and removing processes, but also realize wet electrolysis mass industrialized production, improve production efficiency, improve current efficiency and reduce power consumption.

Description

technical field [0001] The invention relates to an electrolysis cathode plate, in particular to a combined electrolysis cathode plate. The electrolysis cathode plate can realize large-scale industrial production of wet electrolysis and improve electrolysis output and production efficiency. Background technique [0002] Among the existing waste lead-acid battery lead recycling technologies, the wet electrolytic reduction technology is an advanced regeneration technology, and the electrolytic cathode plate is the necessary production equipment for the wet electrolytic reduction technology to realize the reduction of lead oxide. The basic process of the existing wet electrolytic reduction process is to first coat the electrolytic cathode plate with PbSO 4 , PbO 2 , PbO lead paste, and then put the electrolytic cathode plate into the electrolytic tank for electrolysis, so that the electrolytic negative plate is reduced to lead sponge, and then the electrolytic negative plate is...

AI Technical Summary

Problems solved by technology

[0004] (1) The electrolytic output of the electrolytic cathode plate is low and the cost is high, which cannot meet the large-scale industrial production requirements of wet electrolysis, and is only suitable for small and medium-scale production with an annual output of less than 10,000 tons of lead.

[0005] (2) Thickened plates can also be used to increase the electrolysis output appropriately, but due to the increase in the thickness of the raw material layer after paste coating, the resistance will increase, the current effect will be poor, and the power consumption will be greatly increased. At the same time, due to the thickening of the lead paste, the resistance will increase. , is not conducive to electrolysis. Therefore, the range of increasing the electrolysis output by thickening the plate is very limited, and it is not an effective method.

[0006] (3) It is also possible to increase the electrolysis output by adding electrolytic plates and electrolytic cell equipment, but because the higher the design output is, the more electrolytic plates and electrolytic cell equipment are needed, which not only requires increased investment, but also increases the cost of installation. The operation time of the tank and the tank is too long. Since each group of electrolytic tanks is composed of multiple electrolytic tanks and a rectifier, when loading and unloading operations, most of them are powered off. The lower the level of mechanical operation, the greater the labor intensity of the workers. The more time it takes to load and unload the tank, the more the production efficiency will be affected. Therefore, this method can only increase the electrolysis output by a limited amount, which is also one of the reasons why the annual output of the existing technology can only be below 10,000 tons of lead. one

[0007] However, if the area of ​​the single plate of the electrolysis cathode plate is simply increased, another problem will be caused:

[0008] (1) It is very difficult to paste and degrease the large electrolytic cathode plate. When the electrolytic cathode plate is pasted and weighs more than 50KG / piece, normal operation cannot be achieved by manpower

[0009] (2) The wet electrolytic reduction process has certain requirements on the water permeability of the coated lead paste. If it is too dense, the conductivity of the electrolyte is poor, which affects the amount of electrolyte; because usually in the electrolysis process, the coated lead paste must have a certain degree of porosity. After the electrons are deposited on the surface of the lead paste of the cathode, the conduction of the sponge lead and the infiltration of the electrolyte into the lead paste conduct electricity to the negative electrode of the electrolytic plate to form an electrolysis process.

Therefore, the lead paste coated on the electrolytic cathode plate must have a certain degree of porosity. When the general large single-plate cathode plate is used, the lead paste is very easy to fall off. Out of slot job

[0010] (3) The biggest problem is that if the area of ​​the electrolytic cathode plate is made larger, it will not be possible to realize mechanized automatic paste application and depaste, which is a necessary condition for large-scale industrial production of wet electrolysis One, therefore, it cannot meet the large-scale industrial production requirements of wet electrolysis without mechanized automatic paste application and depaste

[0012] (5) Once the large electrolytic plate is damaged, it needs to be repaired as a whole, the repair cost is high, and the construction period is delayed

[0013] Due to the aforementioned defects, the existing wet solid-phase electrolytic reduction process is in the state of small-scale production or testing, and cannot realize large-scale automated production

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