Magnetic drum separator (STM)

In brief

• The magnetic drum separator (STM) performs magnetic separation of ferrous metals from bulk material flows.

• It is used in recycling, waste processing and industrial production plants, fed by belt conveyor or hopper.

• The choice of magnet type depends on the particles: ferrite for large particles, neodymium for fine metal particles.

• Applications

• Operating principles

• Operating recommendations

• General specifications

• Case studies

Applications

The Lenoir-Mec magnetic drum (STM) is used in several industries:

• Lenoir-Mec magnetic drum separators (STM) are industrial units designed to perform magnetic separation of ferrous metals from bulk material flows.

• Used in recycling, waste processing and industrial production plants, these magnetic drums deliver consistent performance, even in continuous operation.

Operating principles

Operating principle of our magnetic drum separators (STM):

• The magnetic drum separator uses a powerful magnetic field to capture the ferromagnetic materials contained in bulk materials.

• The product to be processed is fed by a belt conveyor or a hopper. The flow comes into contact with the surface of the rotating drum. Ferromagnetic materials (iron, steel, magnetic stainless steel) are attracted.

• Non-ferrous materials fall by gravity.

• The metal parts are discharged at the rear of the drum.

  For more general information, see the principle of magnetic separation.

Operating recommendations

Recommendations from our Lenoir-Mec experts:

• Optimal positioning: Install the drum at the discharge of conveyors or under a hopper for efficient sorting.
• Minimal maintenance: Periodically check the condition of the magnetic separator for optimal performance.
• Choice of magnet type: Opt for ferrite for large particles and neodymium for fine metal particles.
• Flow monitoring: Regulate the material throughput to avoid saturating the drum.
• Combination with other equipment: An ideal complement to an eddy current separator for
  optimal sorting of non-ferrous metals.

General specifications

Specifications of Lenoir-Mec magnetic drum separators (STM):

• Magnetic drum in high-strength steel
• Powerful neodymium or ferrite magnets (depending on model)
• Industrial construction with optional stainless steel shell
• Continuous operation, without direct contact
• Self-cleaning system for easier cleaning
• Suitable for industrial temperatures (up to several °C depending on configuration)
• Installation on a conveyor, vibratory chute or gravity feed

The diameter, width and length of the drum (in mm) are defined according to requirements, throughput and the required magnetic strength.

Advantages

• Drive: 2-year warranty
• High processing capacity
• Full automation: Continuous operation without interrupting the production flow

Services

• Assistance with industrial commissioning
• Spare parts stock
• Fast after-sales service response
• Installed base monitoring and periodic performance checks

Frequently asked questions

What does the STM magnetic drum separate?

It performs magnetic separation of ferrous metals (iron, steel, magnetic stainless steel) from bulk material flows. It is used in recycling, waste processing and industrial production plants.

How does the STM separator work?

The product is fed by a belt conveyor or a hopper and comes into contact with the surface of the rotating drum. Ferromagnetic materials are attracted and discharged at the rear of the drum, while non-ferrous materials fall by gravity.

What are the specifications of the STM?

It comprises a high-strength steel drum, neodymium or ferrite magnets depending on the model, and a self-cleaning system. It operates continuously, without direct contact, and can be fitted with an optional stainless steel shell.

How is the STM installed and how is the drum sized?

It is installed on a conveyor, a vibratory chute or with gravity feed, preferably at the discharge of conveyors or under a hopper. The diameter, width and length of the drum, in mm, are defined according to requirements, throughput and the required magnetic strength.

Ferrite or neodymium for the STM, and what maintenance is required?

Ferrite is suited to large particles and neodymium to fine metal particles. Maintenance is minimal: periodically check the condition of the separator and regulate the throughput to avoid saturating the drum.

Technical data

Series 20 (I=520, P=354, H=568, power=250W, speed=40)

Type	L	Flow rate
STM 20/25	250	4
STM 20/36	365	5
STM 20/41	415	6
STM 20/46	465	7
STM 20/56	565	8,5
STM 20/61	615	10
STM 20/71	715	11,5
STM 20/86	865	13
STM 20/101	1015	14,5
STM 20/116	1165	18,5

Series 31 (I=590, P=524, H=870, power=400W, speed=35)

Type	L	Flow rate
STM 31/31	315	30
STM 31/36	365	34
STM 31/41	415	40
STM 31/46	465	43
STM 31/56	565	50
STM 31/61	615	57
STM 31/71	715	66
STM 31/86	865	80
STM 31/101	1015	108
STM 31/116	1165	122
STM 31/136	1365	136
STM 31/146	1465	150
STM 31/166	1665	164

Series 40 (I=826, P=614, H=995, power=750W, speed=35)

Type	L	Flow rate
STM 40/36	365	34
STM 40/41	415	40
STM 40/46	465	43
STM 40/56	565	50
STM 40/61	615	57
STM 40/71	715	66
STM 40/86	865	80
STM 40/96	965	94
STM 40/101	1015	108
STM 40/116	1165	122
STM 40/136	1365	136
STM 40/146	1465	150
STM 40/166	1665	164

Series 50 (I=1036, P=758, H=1220, power=1100W, speed=30)

Type	L	Flow rate
STM 50/46	465	66
STM 50/56	565	80
STM 50/61	615	88
STM 50/71	715	100
STM 50/86	865	122
STM 50/101	1015	144
STM 50/116	1165	165
STM 50/136	1365	195
STM 50/146	1465	208
STM 50/166	1665	238

Series 63 (I=1176, P=916, H=1440, power=1500W, speed=25)

Type	L	Flow rate
STM 63/61	615	110
STM 63/71	715	127
STM 63/86	865	154
STM 63/101	1015	180
STM 63/116	1165	208
STM 63/136	1365	240
STM 63/146	1465	260
STM 63/166	1665	400
STM 63/186	1865	440