Alkaline cell anode mixture granulation screen apparatus

Abstract

The invention discloses a granulating and screening device of an alkaline battery anode mixture. The device comprises a housing, a rotating shaft arranged on the housing by a bearing seat, a granulating device which is fixed with the rotating shaft and is arranged between a material inlet and a material outlet in the housing, and a screen device arranged under the granulating device; wherein, therotating shaft comprises an upper and a lower groups of horizontal rotating shafts, the granulating device comprises a first granulating device and a second granulating device which are respectively arranged on the upper group of horizontal rotating shaft and the lower group of horizontal rotating shaft, the screening device comprises an upper screen and a lower screen which are respectively arranged at the radial periphery at the lower part of the first granulating device and the second granulating device, at least the bottom of the upper screen and the bottom of the lower screen are curved surfaces which reserve clearance and are matched with the rotating tracks at the radial outermost end of the first granulating device and the second granulating device. The granulating and screening device has the advantages of high primary material yield, high work efficiency and high uniformity of anode material moisture, reduces the difficulty of the subsequent forming process, reduces energy consumption and is more compact, and the regulation and control operation of particle size distribution is more convenient.

Description

technical field [0001] The invention relates to a granulation and screening device for positive electrode mixture of alkaline batteries. Background technique [0002] In the manufacturing process of alkaline manganese batteries, the positive electrode powder needs to be compressed and granulated to make the positive electrode powder dense and granular to meet the particle size distribution requirements, so as to ensure the high density and uniformity of the positive electrode filling. There are two methods of granulation: wet method and dry method. Due to the high energy consumption and the heavy carbonation of the positive electrode during the granulation process, which affects the performance of the battery, the wet method has been seldom used. In the common dry granulation process, the positive electrode powder enters the granulation device 3 through the feed port 11, is tabletted, crushed, and granulated, and then sieved by the screening device 4 to become granules that...

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Problems solved by technology

Due to the high brittleness of dry-process tablets, a certain amount of fine granules are formed every time they are rolled, and they are mixed with coarse granules and cannot be separated in time. When rolling again, the fine granules will inevitably be further crushed, making fine granules The powder ratio increases; at the same time, the three-stage rolling cannot guarantee that the coarse particles that do not meet the particle size distribution requirements will not be missed. Therefore, the primary material yield of the equipment is low, usually between 40% and 55%, and the efficiency is not high.

[0005] 2. Due to the low material yield at one time and the large amount of recycled materials, the returned materials after strong tableting and rolling granules have a large amount of water loss, which affects the uniformity of the moisture content of the positive electrode material and increases the difficulty of controlling the moisture content of the positive electrode material. , which in turn affects the effect and yield of tableting and granulation, and has an adverse effect on the stability of the subsequent molding process

[0006] 3. A large amount of recycled material not only consumes energy during the recycling process, but also increases the possibility of contamination of the positive electrode material, and may lead to an increase in the degree of carbonation of the positive electrode material

[0007] 4. The particle size distribution needs to be changed and controlled by adjusting and matching the gaps of the rolling wheels at all levels according to the material condition, the operation is cumbersome and the response speed is slow

[0008] 5. The equipment structure is huge and not compact

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