Sulfur bucket elevator

The Sulfur bucket elevator is used for vertically transporting sulfur materials from lower to higher levels within a factory. This equipment can handle lumpy, granular, and powdered sulfur, with a lifting capacity ranging from 5 to 150 tons per hour and a vertical lifting height of 5-40 meters. Due to the flammable, explosive, and slightly corrosive nature of sulfur, the equipment is equipped with deep stainless steel hoppers or antistatic polyethylene hoppers as standard. The entire casing is made of 304 stainless steel or carbon steel with a heavy-duty anti-corrosion paint coating to resist metal corrosion caused by sulfur acidification.

Benefits of Using a Sulfur Bucket Elevator

When transporting sulfur, static sparks can easily be generated due to friction, causing dust to explode in a confined space. Simultaneously, the trace amounts of sulfuric acid formed when sulfur reacts with water can rapidly corrode ordinary steel. Operating a sulfur bucket elevator keeps these risks within safe limits. The fully enclosed casing isolates airflow, preventing dust from floating within the factory. The use of stainless steel and special antistatic materials eliminates the risk of sparks from metal impacts, extending the equipment's service life by more than three times compared to ordinary carbon steel elevators. The vertical conveying angle is 90 degrees, reducing the factory floor space required by 80% compared to inclined belt conveyors.

 

Sulfur Bucket Elevator Structural Configuration

Explosion-proof Motor Rating: The drive motor configured in this equipment meets Ex d IIB T4 or Ex d IIC T4 explosion-proof ratings. Both the junction box and the machine body have airtight explosion-proof surfaces to prevent internal electrical sparks from igniting external sulfur dust and gas.

Explosion-proof Plate Configuration: Explosion-proof plates (explosion relief windows) with automatic pressure relief are installed in the head and base sections. When the internal pressure of the casing abnormally reaches 0.01-0.02 MPa, the explosion-proof plate will rupture first to release the pressure, guiding the airflow out in a direction and protecting the main casing from deformation.

Material Selection and Combination: The shell is welded from 4mm thick stainless steel plate; the traction components use high-strength anti-static rubber belts or high-strength alloy steel ring chains depending on the height; the hopper is fixed to the line body with anti-loosening bolts, and the edges are passivated.

Sealing Design: The head and bottom shaft bearings adopt an external seat design, leaving a 50mm isolation gap between them and the casing, supplemented by multi-layer labyrinth packing seals and pneumatic shaft seals. Sulfur dust cannot come into contact with the rotating bearings, nor can it escape into the external environment.

Improved Hopper Shape: The rear wall of the hopper is designed with a rounded inner angle, and the front lip has a slope. When wet sulfur becomes sticky, this geometry utilizes the centrifugal force of the material to allow the sulfur to slide smoothly out at the top, reducing material accumulation and hanging at the bottom of the hopper.

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  Explosion-proof motor

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  Hopper

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  Chain

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  Machine housing

Sulfur Bucket Elevator Model Parameter Table

The parameters in this table are calculated based on a sulfur bulk density ρ ≈ 1.2 t/m³. The enclosure and material-contacting parts can be made of 304 stainless steel, 316L stainless steel, or carbon steel coated with heavy-duty anti-corrosion epoxy floor paint. During actual selection, the motor power will be calculated based on the specific vertical height (meters) and hourly conveying capacity (tons) of the factory.

Model	Capacity (t/h)	Max Height (m)	Bucket Width (mm)	Power Range (kW)	Traction Type	Explosion Protection Class
SBE-160	5 - 15	25	160	2.2 - 5.5	Anti-static High-strength Belt	Ex d IIB T4 / IIC T4
SBE-250	15 - 35	30	250	4.0 - 11.0	Anti-static High-strength Belt	Ex d IIB T4 / IIC T4
SBE-315	30 - 60	35	315	7.5 - 18.5	Corrosion-resistant Alloy Ring Chain	Ex d IIB T4 / IIC T4
SBE-400	50 - 90	40	400	11.0 - 30.0	Corrosion-resistant Alloy Ring Chain	Ex d IIB T4 / IIC T4
SBE-500	80 - 150	40	500	15.0 - 45.0	High-strength Heavy-duty Plate Chain	Ex d IIB T4 / IIC T4

Industry Application Scenarios

This equipment operates in the following specific industrial production lines.

Sulfuric Acid Manufacturing Plant: In the process before the sulfur incinerator, it lifts solid sulfur granules from the warehouse to the feed inlet above the molten sulfur tank.

Diamium Phosphate and Compound Fertilizer Production Line: It conveys sulfur powder, used as a sulfur additive, into the mixing mixer.

Petrochemical Desulfurization Sulfur Recovery Unit: It transports granulated sulfur recovered by the Claus process and cooled by a granulator to the finished product storage hopper.

Bulk Logistics Terminal: At the sulfur inlet or outlet, it lifts bulk sulfur unloaded by the unloader to the shore silo.

Customized Sulfur Bucket Elevator

Sulfur bucket elevators can be customized to meet specific needs. The customization process begins with collecting parameters such as sulfur moisture content, particle size, hourly tonnage, and vertical height. Next, designers create CAD mechanical assembly drawings and foundation plans, determining the inlet and outlet flange dimensions. Following this, an explosion-proof compliance review is conducted, verifying the explosion-proof zone designation of the installation site and matching corresponding electrical components. Finally, the elevator enters the workshop manufacturing and trial operation phase. After laser cutting and assembly of the casing, a 4-hour no-load operation test is performed in the factory, with rigorous monitoring of bearing temperature rise and chain tension to ensure quality.

Frequently Asked Questions

Question: How to prevent sulfur from igniting due to friction inside the elevator?

Answer: The elevator's linear speed is controlled within a low-to-medium speed range of 1.2-1.6 m/s. The buckets are made of non-metallic anti-static plastic, or copper strips are added to the edges of stainless steel buckets to prevent ferromagnetic impact.

Question: How to solve the problem of wet sulfur clogging the machine base on rainy days?

Answer: The base is equipped with an adjustable tensioning device and a cleaning chamber door. Combined with the rounded-bottom non-stick hopper, it reduces residue on the machine bottom.

Question: How much does a Sulfur bucket elevator cost?

Answer: Prices range from $2400 to $22900. This is mainly affected by the lifting height, conveying capacity, and explosion-proof materials.

Question: How many years can the equipment casing typically last?

Answer: With a casing made of 304 stainless steel, under normal maintenance and a dry environment, the service life is typically 8 to 10 years.

The Sulfur bucket elevator solves the problems of dust and acid corrosion in the vertical high-level transport of solid sulfur. Through the combined application of explosion-proof motors, external bearing seals, explosion-proof pressure relief discs, and corrosion-resistant materials, the machine can maintain airtightness during continuous operation. Factories can customize chain or belt styles according to the material shape and space height to achieve vertical material displacement of bulk sulfur.