The bottom‑stirred stainless steel mixing tank is a specialized blending device in which the agitator is mounted at the bottom of the vessel and extends vertically upward into the interior. Constructed primarily from stainless steel and manufactured through professional processes such as welding, stamping, polishing, and assembly, it combines sealed storage with highly efficient mixing. It is ideally suited for stirring, homogenizing, preventing sedimentation, dissolving, and facilitating reactions involving various liquids and liquid–solid mixtures. With its agitator positioned at the vessel’s base, the system enables continuous circulation and thorough turnover of materials from bottom to top, effectively preventing buildup and caking at the tank bottom. Its compact design minimizes overhead space, and it can be customized to meet specific process requirements across different industries—adjusting volume, agitation speed, impeller type, and ancillary features such as heating, cooling, insulation, or in‑line cleaning. Designed and produced in strict compliance with relevant industry standards, it balances mixing efficiency, operational safety, and ease of maintenance, making it well‑suited for large‑volume applications, high‑viscosity materials, and production environments where headspace is limited.

Scope of Application /Scope Of Application
Bottom‑stirred stainless steel mixing tanks, with their excellent anti‑settling performance, high space utilization, and efficient mixing, are widely used across numerous industrial sectors. They are particularly well suited for applications involving large‑volume, high‑viscosity materials and situations where additional equipment is mounted on the tank top. Specific applications include:
• Petrochemical industry: Used for anti‑sedimentation stirring in large crude oil storage tanks, lubricant storage tanks, and chemical raw material storage tanks, as well as for the mixing, dissolution, and reaction of high‑viscosity chemical intermediates, asphalt, resins, and other materials. Bottom‑mounted agitators enable full‑tank circulation, preventing sedimentation and caking at the tank bottom, and are well suited to continuous production processes.
• Fine Chemicals and New Energy Industries: Suitable for blending and dispersing high-viscosity materials such as pigments, dyes, and adhesives in the fine chemicals sector, as well as for homogenizing lithium‑battery cathode materials and electrolytes in the new energy field. It is resistant to certain corrosive media and meets the requirements for uniform mixing of high‑viscosity formulations.
• Environmental water treatment industry: Used for anti‑settling agitation in large sludge storage tanks and neutralization tanks, as well as for dissolving and blending high‑concentration water treatment chemicals, ensuring thorough mixing of sludge and chemicals, preventing sludge deposition, and enhancing wastewater treatment efficiency. Suitable for large-scale wastewater treatment plants and industrial wastewater treatment applications.
• Food and beverage industry: Used for anti‑sedimentation mixing in large storage tanks for syrups, edible oils, and dairy products, as well as for blending and homogenizing viscous materials such as jams and sauces. Made from materials that meet food‑contact safety standards, it does not leach harmful substances, helping to prevent layering and spoilage of the product, and is well suited to the large‑scale storage and mixing requirements of food production.
• Pharmaceuticals and Other Industries: In the pharmaceutical sector, it is used for formulating and stirring high-viscosity liquid formulations and active pharmaceutical ingredients, complying with GMP standards and enabling aseptic mixing. It can also be applied in metallurgical processes such as slurry agitation and in the building materials industry for paint mixing, meeting diverse operational requirements.

Material Advantages /Material Advantage
This product is crafted from premium stainless steels such as 304 and 316L, with material selection rigorously tailored to meet the corrosion‑resistance requirements and hygiene standards of various operating conditions. Its key advantages are as follows:
• Corrosion resistance tailored to diverse operating conditions: 304 stainless steel, with 18% chromium and 8% nickel, forms a dense oxide film, providing basic corrosion resistance and making it suitable for typical applications involving mild acids and alkalis, clean water, and food and beverage processing. 316L stainless steel builds on the 304 grade by adding molybdenum and limiting carbon content to ≤0.03%, significantly enhancing its resistance to chloride ions and highly corrosive media. It can withstand exposure to seawater, high‑concentration acids and alkalis, and organic solvents, effectively preventing pitting and intergranular corrosion, and is well suited for demanding corrosive environments in industries such as chemical processing and new energy.
• Meets hygiene and safety standards, suitable for high‑cleanliness applications: Products designed for the food and pharmaceutical industries utilize cold‑rolled stainless steel sheets; the inner tank surface is mirror‑polished to achieve a surface roughness of Ra ≤ 0.4 μm, followed by nitric acid passivation. Compliant with GB 4806.9‑2016 National Food Safety Standard and GMP guidelines for pharmaceutical manufacturing, these products ensure that heavy metal migration remains within applicable limits, no harmful substances are released, and no reactions occur with process materials, thereby preventing secondary contamination. They are easy to clean and free from hard‑to‑reach sanitary dead zones.
• Structural stability and long service life: Stainless steel boasts high tensile strength and excellent toughness. Grade 304 stainless steel has a tensile strength of ≥515 MPa and can withstand temperatures ranging from −270°C to 427°C, while Grade 316L stainless steel tolerates temperatures from −196°C to 450°C. It is resistant to deformation and aging, ensuring stable operation for many years under normal conditions without the need for frequent anti-corrosion treatments, thereby effectively reducing long-term maintenance costs. The bottom agitator features a reinforced design that can handle the resistance of high-viscosity materials and is highly durable.
• Environmentally friendly and recyclable, in line with green manufacturing principles: Stainless steel is 100% recyclable and generates no waste pollution. Compared to mixing tanks made from other materials, it better meets the demands of modern, eco‑friendly industrial production, and its long-term use produces no harmful waste, balancing practicality with environmental sustainability.

Technological Advantages /Technical Advantage
Product manufacturing integrates mature manufacturing processes with a rigorous quality‑control system, focusing on the core features of the bottom‑stirring design to deliver differentiated technical advantages in sedimentation prevention, sealing performance, and structural stability, thereby ensuring the product meets the requirements of diverse operating conditions.
• The bottom-mounted agitator features a well‑designed structure that delivers outstanding anti‑settling performance: the stirring assembly is installed at the center of the vessel’s bottom, with the impeller rotating upward to generate a strong, up‑ward circulation. This ensures thorough mixing throughout the tank, effectively preventing material from settling and forming clumps at the base—particularly well suited for large‑volume, high‑viscosity applications exceeding 100 m³. Moreover, the dead zones in this configuration are significantly lower than those associated with side‑mounted or top‑mounted agitators.
• The mixing system boasts strong adaptability and stable efficiency: impeller types such as anchor, ribbon, and propeller are available, allowing precise matching to material viscosity and mixing objectives. Stirring speed is continuously adjustable via variable-frequency drive, ranging from 25 to 120 rpm, accommodating mixing requirements across a wide viscosity spectrum—from low‑viscosity to ultra‑high‑viscosity materials. The motor and reducer are connected by a flange, ensuring secure installation, ample torque, and consistent mixing performance with optimized energy consumption.
• Reliable sealing technology eliminates leakage risks: The connection between the bottom agitator shaft and the vessel body employs a double‑ended mechanical seal, equipped with a dedicated sealing chamber and cooling system. This effectively isolates the process fluid from the external environment, preventing product leakage and the ingress of foreign contaminants, while also protecting the seal components from damage caused by fluid erosion and excessive temperatures. The design is suitable for demanding operating conditions such as high pressure, severe corrosion, and high viscosity, with sealing performance compliant with relevant industry standards.
• Welding process specifications and structural strength compliance: High-precision seamless welding is employed, with 100% radiographic inspection of the tank body and agitator assembly’s butt welds. The weld joint coefficient φ is ≥0.85, and the weld toe height is ≥1.2 times the tank wall thickness. Weld strength reaches over 95% of the base material. Following welding, a specialized passivation treatment is applied to further enhance corrosion resistance. The tank bottom features a thickened design to improve load-bearing capacity and accommodate the installation and operational requirements of the bottom-mounted agitator.
• Strict quality control and convenient operation & maintenance: From raw material procurement to product shipment, a comprehensive quality‑inspection system is in place. All raw materials comply with national standards such as GB/T 4237‑2015 and GB/T 3280‑2021. Prior to dispatch, the products undergo multiple tests, including hydrostatic pressure and air‑tightness testing, with standardized test reports issued. The tank surface is smooth and free of pores; routine maintenance requires only periodic cleaning. The agitator is equipped with a dedicated access port, and wear parts can be replaced easily without emptying the tank, thereby reducing operational complexity and costs.