LM250 Pulveriser Ring Mill
The LM250 is a laboratory machine, which is suitable for pulverizing and homogenizing hard and brittle materials in the dry and wet state.
The LM250 is a laboratory machine, which is suitable for pulverizing and homogenizing hard and brittle materials in the dry and wet state. The closed milling pulverizing system guarantees complete recovery of the samples.
Final fineness of down to 75 µm can be achieved, depending on the milling time and the specific properties of the sample material.
With a LAARMANN Ring Mill you put the sample together with a disc or a set of rings and roller in a bowl to bring it all together into 3-dimensional vibrations.
Inside the bowls the sample will be ground and homogenized by high pressure, impact and friction rapidly down to analytical end fineness. Typically samples are ground to 90-95% < 75µm in app. 3 minutes. Exact time and end fineness depends on the sample characteristics
The standard speed is 1450 rpm. We can provide a different rpm if it's a necessary requirement for the application. rpm adjustment is an optional feature that can be implemented in the program
Features and Benefits
- Digital control by touch screen
- End fineness up to 75 micron (µm)
- Standard chrome steel and standard steel bowls and discs other materials on request
- Optional lifting device for the operator
Technical Specifications
| Applications | ultra-fine grinding of hard, brittle, and abrasive materials, providing samples for analysis in mining, metallurgy, and geochemistry laboratories |
| Working principle | Friction |
| Feed size* | < 15 mm |
| End fineness* | < 75 μm |
| Throughput | 30-300cc (cm³) |
| Speed setting | Up to 1450 rpm |
| Setting adjustment method | digital control panel |
| Consumable material | standard steel, chrome steel, zirconium, tungsten carbide others on request |
| Consumable sizes | 300ml bowls and 800cc (cm³) discs |
| Power supply | 400V ± 10% - 50/60Hz |
| Electrical requirements | 1,3 kW |
| Power connection | 3 phase |
| Dust extraction point | 1 |
| Standard | CE |
| Protection code | IP40 |
| Weight | 210kg |
| Dimensions (width x length x height) | 550 x 602 x 1032 mm |
Ring Mill Working principle
The working principle of a ring mill is based on high-speed friction and pressure. The sample material is placed in a grinding bowl along with a puck and ring. When the machine is activated, the bowl is vibrated or rotated rapidly, causing the puck and ring to collide with the material under high pressure. This grinding action reduces the material to a fine, uniform powder. The enclosed grinding chamber ensures minimal sample loss and contamination, making the process efficient and repeatable for a variety of materials.
