ROBUST & VERSATILE
- Front door facilitates cleaning of crushing chamber
- Infinite/continuous gap width setting
- Wide range of materials for contamination free grinding
- Collecting receptacle with outlet for continuous operation
- Connector for dust extraction
- Scale indicates jaw wear
- Selection of hoppers for specific applications
Versatile unit with a focus on fineness
SUPERIORITY IN DETAIL
For sample amounts up to 10 l, the Jaw Crusher BB 250 is used batchwise; for larger volumes it can be operated continuously. Thanks to the modular concept of the housing and frame, this jaw crusher is suitable for a wide range of applications.
A front door gives direct access to the crushing chamber at a perfect height for ergonomic and easy cleaning. The feed hopper with splash-back protection can be removed quickly and easily. The Jaw Crusher BB 250 has a connection for dust extraction and is protected against mechanical overload. A scale indicates the wear of the breaking jaws, informing the user when it is time for an exchange.
The crushing chamber is available in 6 different materials to ensure neutral-to-analysis sample preparation. The technical and safety features make this jaw crusher ideally suited for sample preparation in laboratories and for small scale production.
ACCESSORIES FOR THE BB 250 JAW CRUSHER
Breaking Jaws
Breaking jaws and wearing plates are available in five different materials to be selected depending on the sample and the analysis to be carried out:
- Manganese steel
- Stainless steel
- Tungsten carbide
- Steel for heavy-metal free grinding
- Stainless steel 316L
- NiHard4 steel
Hopper Types
Three hopper types are available for the BB 250 jaw crusher.
The standard hopper can be optionally equipped with a special infeed hopper. This additional hopper can be placed on a table for loading up to 10 l of sample material. By attaching it to the standard hopper with a connection rod, the sample is fed into the BB 250 with the help of a manual pusher.
A special hopper is available for quick and easy feeding of drill cores or large amounts of bulk material. The cover can be closed to serve as splash back protection.
Collecting Vessels
In addition to the standard receptacle which accepts sample amounts up to 10 l, two options are available.
For continuous operation the collection funnel with outlet is the ideal choice.
The large volume receptacle accepts up to 26 liter of sample and comes with a flexible connection flange and a carrier on wheels. This version is the best choice for dust-free operation.
TWO STAGE SAMPLE PREPARATION IN ONE STEP
The combi unit, featuring the Jaw Crusher BB 250 and the Disc Mill DM 200 connected via a cyclone separator, enables automated, continuous sample preparation. Material is directly transported from the jaw crusher to the disk mill, allowing large feed sizes to be processed in one step to a defined final fineness of small particles. This two-step grinding process is necessary for hard or brittle materials that require initial coarse reduction followed by fine grinding. The combi unit streamlines workflows, eliminates manual sample transfer, and significantly reduces processing time. It minimizes dust emissions and ensures efficient, reproducible results, making it an ideal solution for applications in agriculture, cement production, mining, precious metal analysis, materials research, and environmental analysis.
Application example of the combi unit
- Gap setting jaw crusher: 2 mm
- Gap setting disc mill: 0.2 mm
- Feed size: 60 mm
- Final fineness: 200 μm
- Sample amount: 1 kg
- Process time: 10 min
Cyclone System for Jaw Crushers
Bye-bye Dust and Sample Loss
Whether you’re preparing samples in mining, precious metals, materials research, or environmental analysis, the RETSCH Cyclone System ensures efficiency, precision and safety like never before!
Why should you choose the RETSCH Cyclone System?
- Total Sample Recovery
Eliminate sample loss during crushing with our cyclone, ensuring accurate and reproducible results for every analysis! - Enhanced Operator Safety
Our cyclone significantly reduces dust exposure, creating a safer and cleaner working environment for your team!
Plus: Existing instruments (BB 50, BB 250, BB 400 or BB 500) can be retrofitted with the Cyclone System
Using the cyclone set with a combination of two machines
Beyond the general advantages of a cyclone, this combination enables pre-crushing and fine grinding in a single pass, resulting in increased process efficiency.
Existing machines BB 250 and DM 200 can be combined with a retrofitting system.
TYPICAL MATERIAL TYPES
RETSCH’s powerful jaw crushers are ideally suited for preliminary crushing of construction materials, ores, granite, oxide ceramics, quartz, slag, silicon, coal, tungsten alloys, cement clinker, etc.
FUNCTIONAL PRINCIPAL
The Jaw Crusher BB 250 is a robust and powerful forced-feed crusher. The feed material passes through the no-rebound hopper and enters the crushing chamber.
Size reduction takes place in the wedge shaped area between the fixed crushing arm and one moved by an eccentric drive shaft. The elliptical motion crushes the sample which is moved towards the crushing gap under gravity.
As soon as the sample is smaller than the discharge gap width, it falls into a removable collector within the jaw crusher. The continuous gap width setting with scale ensures optimum size reduction in accordance with the set gap width.
TECHNICAL DATA
| Applications | coarse and pre-crushing |
| Field of application | chemistry / plastics, construction materials, engineering / electronics, environment / recycling, geology / metallurgy, glass / ceramics |
| Feed material | medium-hard, hard, brittle, tough |
| Size reduction principle | pressure |
| Material feed size* | < 120 x 90 mm |
| Final fineness* | < 2 mm |
| Throughput* | 300 kg/h |
| Material of grinding tools | manganese steel, stainless steel, tungsten carbide, steel for heavy-metal free grinding, stainless steel 316L, NiHard4 |
| Jaw width | 120 x 90 mm |
| Gap width setting | 0 – 30 mm |
| Gap width display | Scale |
| Zero point adjustment | 3,4 mm |
| Wearing rate display | 4,6 mm |
| Removable hopper | 6,9 mm |
| Dust extraction unit | yes |
| Central lubrication | no |
| Process line version | Optional |
| Collector capacity | 10 l |
| Base frame | vario frame (adjustable for continous crushing) |
| Drive | 3-phase motor |
| Drive power | 3.0 kW |
| Electrical supply data | different voltages |
| Power connection | 3-phase |
| Protection code | IP 55 |
| W x H x D closed | 695 x 1399 x 719 mm |
| Net weight | ~ 350 kg |
| Standards | CE |
*depending on feed material and instrument configuration/settings
