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blade

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Overview of Electroplating Sludge Materials：

Electroplating sludge refers to the heavy metal containing sludge waste generated after wastewater treatment in the electroplating industry, which is classified as Class 17 hazardous waste in the list of hazardous wastes. As the "final product" of electroplating wastewater, although its amount is much smaller than that of wastewater, due to the transfer of heavy metals such as Cu, Ni, Cr, Zn, Fe in wastewater to sludge, in a sense, electroplating heavy metal sludge poses a more serious threat to the environment than electroplating wastewater. If this highly hazardous electroplating sludge is not disposed of, its damage to the ecological environment is self-evident. On the other hand, if the high-grade heavy metal substances in electroplating sludge are not recovered, it means a huge waste of resources. Therefore, scholars both domestically and internationally have conducted extensive research on the harmless disposal and comprehensive utilization of electroplating heavy metal sludge, achieving many phased results.

Working principle of electroplating sludge dryer:

The specialized electroplating sludge dryer is a new type of sludge dryer developed on the basis of a single channel rotary dryer, which can dry materials with a moisture content of 90% to finished products in one go. In response to the tendency of sludge to agglomerate during the drying process, the material plate structure of a typical single channel dryer has been changed to adopt a combined lifting plate structure, with the addition of movable grate wing plates and self-cleaning devices, greatly expanding the application scope of the single channel dryer. It can not only dry various types of sludge, but also various high viscosity materials. The specialized sludge dryer is suitable for drying general viscosity sludge, which has an apparent viscosity of less than 10000 centipoise. If it is high viscosity sludge, due to its certain viscosity, the wet sludge enters the dryer and is divided into the following working areas: the sludge enters the guide plate inside the dryer through the chute from the feeder (zone one), and as the cylinder rotates, the material is guided to the inclined lifting plate (zone two), which is lifted to the main position of the cylinder and gradually scattered to form a material curtain. High temperature airflow passes through it, preheating the material and evaporating some moisture.

Characteristics of electroplating sludge dryer：

The electroplating sludge dryer has strong overload resistance, large processing capacity, low fuel consumption, and low drying cost. Adopting the downstream drying method, the flue gas and wet materials enter the dryer from the same side, which can utilize high-temperature flue gas to achieve high evaporation intensity. The outlet temperature of the dryer is low, and the thermal efficiency is high. The dryer adopts a "self-aligning supporting wheel device", which makes the cooperation between the supporting wheel and the rolling ring in linear contact, greatly reducing wear and power loss. The new internal structure enhances the cleaning and heat conduction of dispersed materials, eliminates the sticking phenomenon on the inner wall of the cylinder, and has stronger adaptability to material moisture and viscosity. It has the characteristics of high drying efficiency and good effect for high moisture materials such as sludge.

Characteristics:

The blade dryer has low energy consumption: due to indirect heating, it does not carry a large amount of air to take away heat. The outer wall of the dryer is also equipped with an insulation layer. For slurry materials, evaporating 1kg of water only requires 1.22kg of steam.

The blade dryer system has low cost: it has a huge heat transfer surface per unit effective volume, which shortens processing time and reduces equipment size. This greatly reduces the building area and space.

Wide range of material processing: Using different heat media, it can handle both thermosensitive materials and materials that require high-temperature treatment. Common media include steam, thermal oil, hot water, cooling water, etc. It can operate continuously or intermittently and can be applied in many fields.

Low environmental pollution: No use of portable air, minimal dust and material entrainment. The solvent evaporation of the material is very small, making it easy to handle. For materials that are contaminated or require solvent recovery, closed-loop circulation can be used.

Low operating costs: The device operates normally with only 1-2 people per day. Low speed stirring and reasonable structure. The wear and tear is small, and the maintenance cost is very low.

Stable operation: Due to the special compression expansion stirring effect of the wedge-shaped blade, the material particles are fully in contact with the heat transfer surface. In the axial range, the temperature, humidity, and mixing gradient of the material are very small, thereby ensuring the stability of the process.

The drying equipment has multiple operating methods: it can be operated continuously or intermittently; It can be dried under normal pressure, vacuum dried for thermosensitive materials, heated for evaporation, or cooled for crystallization; Can be used as a pre drying for secondary drying. The solvent can be recovered during the drying process.