The bottom-mounted stainless steel mixing tank is a dedicated mixing device with the agitator installed at the bottom of the vessel and extending vertically upward into its interior. Constructed mainly from stainless steel and manufactured through professional welding, stamping, polishing, and assembly processes, it combines sealed storage with efficient agitation. It is chiefly used for stirring, homogenizing, preventing sedimentation, dissolving, and assisting reactions of various liquids and liquid–solid mixtures. Because the agitator is introduced from the bottom, the tank produces a bottom-to-top circulation that effectively prevents material buildup and caking on the tank floor. Its compact design does not occupy the tank’s top space, and it can be customized to industry process requirements for capacity, agitation speed, impeller type, and auxiliary functions (such as heating, cooling, insulation, and 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 suitable for large-volume applications, high-viscosity materials, and production scenarios with limited top space.

Scope of application /Scope Of Application
Stainless steel mixing tanks with bottom impellers are widely used across various industrial sectors thanks to their excellent anti-settling performance, high space utilization, and efficient mixing. They are particularly well-suited for applications involving large volumes, high-viscosity materials, and configurations where other equipment is mounted on top. Specific applications include:
• Petrochemical industry: Used for anti‑settling agitation in large crude oil storage tanks, lubricant storage tanks, and chemical raw material storage tanks, as well as for mixing, dissolving, and reacting high‑viscosity chemical intermediates, asphalt, resins, and similar materials. Bottom stirring enables full‑tank circulation, preventing sedimentation and caking at the tank bottom, and it is suitable for continuous production processes.
• Fine Chemicals and New Energy Industries: Suitable for mixing and dispersing high-viscosity materials such as pigments, dyes, and adhesives in the fine chemicals sector, and for stirring and homogenizing lithium-ion battery cathode materials and electrolytes in the new energy field. It can withstand certain corrosive media and meets the requirements for uniform mixing of high-viscosity materials.
• Environmental water treatment industry: Used for anti‑settling mixing 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 improving wastewater treatment efficiency; suitable for large-scale wastewater treatment plants and industrial wastewater treatment applications.
• Food and beverage industry: Used for anti-settling agitation in large storage tanks for syrups, edible oils, and dairy products, as well as for mixing and homogenizing viscous materials such as jams and sauces. Made from materials that meet food-contact safety standards and do not leach harmful substances, it prevents layering and spoilage of the product, catering to the large-scale storage and mixing requirements of food production.
• Pharmaceuticals and Other Industries: In the pharmaceutical sector, it is used for blending and stirring high-viscosity liquid formulations and active pharmaceutical ingredients, complying with GMP standards and enabling sterile mixing. It can also be applied in scenarios such as slurry agitation in the metallurgical industry and paint mixing in the building materials industry, meeting diverse operational requirements.

Material Advantages /Material Advantage
The core material of this product is selected from mainstream stainless steels such as 304 and 316L. Material selection rigorously matches the corrosion requirements and hygiene standards of different operating conditions. Its key advantages are as follows:
• Corrosion resistance suitable for various operating conditions: 304 stainless steel contains 18% chromium and 8% nickel, forming a dense oxide film that provides basic corrosion resistance, making it suitable for typical applications involving mild acids and alkalis, fresh water, and food and beverage processing. Building on the 304 composition, 316L stainless steel adds molybdenum and limits 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, preventing pitting corrosion and intergranular corrosion, and is therefore well suited for harsh corrosive environments in industries such as chemical processing and new energy.
• Meets hygiene and safety standards, suitable for high-cleanliness requirements: Products designed specifically for the food and pharmaceutical industries use cold-rolled stainless steel sheets. The inner wall of the tank is mirror-polished, with surface roughness controlled to Ra ≤ 0.4 μm, and it undergoes nitric acid passivation. These tanks comply with the GB 4806.9-2016 National Food Safety Standard and GMP (Good Manufacturing Practice) regulations for pharmaceutical production. Heavy metal migration meets relevant standards, no harmful substances are released, and no reactions occur with process materials, thereby preventing secondary contamination. They are easy to clean and have no sanitation dead zones.
• Stable structure and long service life: Stainless steel offers high tensile strength and excellent toughness. Grade 304 stainless steel has a tensile strength of ≥515 MPa and can withstand temperatures from -270°C to 427°C, while grade 316L stainless steel tolerates temperatures from -196°C to 450°C. These materials resist 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 resistant to damage.
• Environmentally friendly and recyclable, aligning 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 industrial green production. It produces no harmful waste over long-term use, balancing practicality with environmental sustainability.

Technological Advantages /Technical Advantage
Product manufacturing integrates mature production processes with a rigorous quality control system. By focusing on the core characteristics of the bottom‑stirring design, it establishes differentiated technical advantages in anti‑settling performance, sealing integrity, and structural stability, ensuring the product meets the demands of diverse operating conditions:
• The bottom-mounted design is well engineered, delivering excellent anti-settling performance: the agitator is installed at the center of the vessel’s bottom, with the impeller rotating upward to create a strong upflow circulation. This ensures thorough mixing throughout the tank, effectively preventing material from settling and caking at the bottom. It is particularly suitable for large‑volume, high‑viscosity materials in vessels of 100 m³ or greater, with dead zones significantly lower than those of side‑mounted or top‑mounted agitators.
• Highly adaptable and consistently efficient mixing system: The impellers—available in anchor, ribbon, and propeller types—can be precisely matched to material viscosity and mixing objectives. Variable-frequency drive allows adjustable speeds from 25 to 120 rpm, accommodating materials ranging from low to ultra‑high viscosity. The motor and gearbox are connected via a flange for secure installation and ample torque, ensuring stable mixing performance and reasonable energy consumption.
• Reliable sealing technology eliminates leakage risks: The connection between the bottom agitator shaft and the vessel employs a double mechanical seal, equipped with a dedicated seal chamber and cooling system. This effectively isolates the process material from the external environment, preventing leaks and ingress of foreign contaminants, while also protecting the seals from damage due to material erosion or excessive temperatures. Suitable for demanding operating conditions such as high pressure, severe corrosion, and high viscosity, the sealing performance meets 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 butt welds. The weld joint factor φ is ≥0.85, and the leg size of fillet welds 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 bottom-mounted agitators.
• Strict quality control and convenient operation & maintenance: A comprehensive quality inspection system covers every stage, from raw material procurement to product shipment. All raw materials comply with national standards such as GB/T 4237-2015 and GB/T 3280-2021. Before leaving the factory, products undergo multiple tests, including hydrostatic pressure and air tightness, with standardized test reports issued. The tank interior is smooth and pore-free, requiring only routine periodic cleaning. The agitator features a dedicated access port for easy replacement of wear parts, and maintenance can be performed without emptying the tank, reducing operational complexity and costs.