Electroplating sludge is a solid waste produced after electroplating wastewater treatment, in the electroplating production process in the pre-treatment and electroplating post-treatment stage, a large number of water rinsing plated parts produced plating wastewater, electroplating wastewater, acid and alkali neutralization, flocculation and precipitation, etc. The formation of precipitates after the treatment of electroplating wastewater, that is, electroplating sludge. It mainly contains heavy metal compounds such as chromium, iron, nickel, copper, zinc and their soluble salts, and also contains chemicals such as reducing agent, neutralizing agent and flocculating agent added by electroplating enterprises when treating waste solution. Harmful heavy metals in electroplating sludge gradually penetrate downward into the soil and can kill microorganisms, causing a rapid decline in soil quality and leading to reduced crop yields or even withering. After it rains, electroplating sludge produces a large amount of liquid containing pollutants, which gradually pollutes water bodies and poses a great threat to the safety of water resources. Metallic substances present in the sludge can enter the human body through the food chain or in the atmosphere, which may cause skin
skin and respiratory discomfort, and in severe cases, may lead to neurological damage or even cause serious organ disorders.
With the increasing awareness of environmental protection and the continuous improvement of related regulations, electroplating companies must treat sludge in a compliant manner to reduce the pollution to the environment. This makes electroplating sludge drying, as an effective means of reducing and stabilizing treatment, a measure for electroplating enterprises to meet environmental requirements. Electroplating sludge drying paddle dryer through the role of stirring paddles, so that the sludge and heating medium full contact, drying uniformity, can effectively avoid the problem of local overheating or incomplete drying of sludge, to ensure the quality and stability of sludge after drying. Meanwhile, the dried sludge is in loose shape, which is easy for subsequent treatment and disposal, and improves the efficiency and reliability of the whole sludge treatment system.
Electroplating sludge drying paddle dryer structure composition
(1) W-shaped shell: generally made of carbon steel or stainless steel, with good corrosion resistance and sealing, can effectively prevent material leakage and heat dissipation. Inside the shell is a hollow structure, forming a jacket, used to pass into the heating medium.
(2) Hollow paddle shaft: the core component of the dryer, usually composed of two hollow shaft, the shaft is densely arranged with wedge-shaped hollow paddle. The material of hollow paddle shaft is generally matched with the shell, and the paddle and shaft are molded as one piece.
Structure to ensure the strength and stability of the structure. The hot medium flows through the hollow shaft through the paddle, thus heating the material.
(3) Transmission device: including motor, reducer, coupling, etc., used to drive the hollow paddle shaft to rotate, providing power for material conveying and mixing.
(4) Sealing device: installed between the shaft end and the shell, to prevent the material dust from leaking out, to ensure the sealing of the equipment and environmental hygiene.
(5) Feeding device: generally consists of feeding hopper, screw conveyor or belt conveyor, etc. It is used to feed the electroplating sludge evenly into the feeding port of the dryer.
(6) Discharge device: including discharge port, discharge valve, etc. The dried electroplating sludge is discharged through the discharge port, and the discharge valve can control the discharge speed and flow of the material.
Electroplating sludge drying paddle dryer structure composition
(1) W-shaped shell: generally made of carbon steel or stainless steel, with good corrosion resistance and sealing, can effectively prevent material leakage and heat dissipation. Inside the shell is a hollow structure, forming a jacket, used to pass into the heating medium.
(2) Hollow paddle shaft: the core component of the dryer, usually consists of two hollow shaft, the shaft is densely arranged with wedge-shaped hollow paddle. Hollow paddle shaft material is generally matched with the shell, paddle and shaft for the one-piece molding structure, to ensure the strength and stability of the structure. The hot medium flows through the hollow shaft through the paddle, thus heating the material.
(3) Transmission device: including motor, reducer, coupling, etc., used to drive the hollow paddle shaft to rotate, providing power for material conveying and mixing.
(4) Sealing device: installed between the shaft end and the shell, to prevent the material dust from leaking out, to ensure the sealing of the equipment and environmental hygiene.
(5) Feeding device: generally consists of feeding hopper, screw conveyor or belt conveyor, etc. It is used to feed the electroplating sludge evenly into the feeding port of the dryer.
(6) Discharge device: including discharge port, discharge valve, etc. The dried electroplating sludge is discharged through the discharge port, and the discharge valve can control the discharge speed and flow of the material.
Electroplating sludge drying paddle dryer performance characteristics
(1)High efficiency and energy saving
Indirect heating mode: Adopting indirect heating by heat conduction, it does not need a lot of gas to take away the moisture, which greatly reduces the heat loss, high thermal efficiency and low energy consumption. For example, only 1.3 kg of water vapor is needed to evaporate 1 kg of water. Compared with other drying methods, it can effectively reduce energy consumption and save operation cost.
(1)High heat transfer coefficient: When the wedge-shaped paddle on the hollow paddle shaft rotates, the material is compressed and expanded alternately, and it is in close contact with the heat transfer surface, and at the same time, the contact interface is updated constantly, so that it obtains high heat transfer coefficient and speeds up the drying speed.
(2)Space-saving: stirring and mixing make the material flip violently, obtaining high heat transfer coefficient at the same time, the equipment covers a small area and space, saving the infrastructure costs of the plant.
(3)Strong material adaptability
Wide range of material handling capacity: using different heat media, it can handle both heat-sensitive materials and materials requiring high-temperature treatment. It can be widely used in drying various sludge and high humidity materials, and it has good adaptability to electroplating sludge with different humidity and viscosity, and it can reduce the moisture content of the sludge from 70%-90% to below 30%. Adjustable material residence time: by adjusting the charging speed, stirring shaft speed, material filling degree and other parameters, the residence time of the material can be adjusted arbitrarily from a few minutes to a few hours, which can better satisfy the drying demand of electroplating sludge with different moisture content and different processing capacity.
(4) Good environmental performance: the drying process gas consumption is small, low flow rate, the amount of dust taken away by the gas is small, after drying the gas dust recovery is convenient, the recovery equipment is small in size, the pollution of the environment is small. At the same time, the equipment has good sealing, which can effectively prevent material leakage and dust flying and improve the working environment.
(5)Stable and reliable operation: Due to the special compression-expansion stirring effect of the wedge-type paddle, the material particles are fully in contact with the heat-transferring surface, and the gradient of temperature, humidity and mixing degree of the material is very small within the axial interval, thus ensuring the stability of the process, and the moisture content of the dried product is uniform and the quality is stable.
(6)Low maintenance cost of the equipment: the equipment structure is relatively simple, few moving parts, smooth operation, and the use of high-quality materials and advanced manufacturing process, with good wear resistance, corrosion resistance and reliability, so the equipment has a long service life, low maintenance costs.
(7) High degree of automation: fully automatic production can be realized, small amount of labor, low power consumption, smooth operation, low noise, reducing labor costs and labor intensity, and improving production efficiency.
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