Services

We are happy to support you with our extensive experience!

Our diverse experimental and technical possibilities cover, inter alia, the following areas:

  • Comminution
  • Classification
  • Agglomeration / briquetting / compaction
  • Magnetic separation
  • Quantitative Microstructure Analysis (QMA)

From left to right: Classification, briquetting, comminution; Pictures: Detlev Müller

 

From left to right: Briquetting, magnetic separation, Quantitative Microstructure Analysis (QMA); Pictures: Detlev Müller, Tim Hühnerfürst

 

We assist you, amongst other things, with:

  • Selection of suitable comminution processes and machines, e.g. to achieve special particle shapes and particle size distributions
  • Determination of suitable classification methods and the definition of suitable plant and operating parameters
  • Selection of suitable agglomeration processes for the coarsening of products
  • Wear tests and service life forecasts for crushing tools
  • Adaptation of comminution and classifying machines to special requirements
  • Weak point analyses of existing comminution and classifying machines and systems
  • Preliminary investigations for the development of new comminution and classifying machines and new granulometries of construction materials

Below you can find a detailed overview of our technical equipment and some of the feasible analysis possibilities:

 

► Comminution

  • Implementation of technical investigations for coarse, medium and fine comminution in impact, cone, jaw, roller and hammer crushers as well as roller, beater, beater wheel, ball and vibration tube mills etc.
  • Variation of relevant constructional and operational factors taking into account the rock structure and texture data
  • Pressure comminution
    • Stamp press
      • Pressure up to 350 MPa
      • Pressing speed up to 200 mm / s
    • High-compression roller mill
      • Throughput and circulation tests
      • Throughputs up to 45 m³ / h
      • Specific pressing forces up to 10 N / mm²
  • High-speed comminution
    • Pin mill
      • Loading rate up to 200 m / s
  • Electric Impulse Comminution (EIC)
    • Electrohydraulic comminution
      • Voltages up to 40 kV
      • Pulse energy up to 600 J
      • Pulse rise 0.7 - 4.5 µs
    • Electrodynamic comminution
      • Voltages up to 600 kV
      • Pulse energy up to 600 J
      • Pulse rise << 0.5 µs
 

► Classifying / granulometric analyses

  • Particle size measurements (CPA) within the ranges 0.04 - 12.5 mm and 0.2 - 150 mm
  • Particle shape measurements (CPA) with adaptation for particle shape calipers according to DIN 52114
  • Sieve analyses
    • Oscillation and air jet screening in the particle size range 0.036 - 125 mm
  • Particle size distributions
    • Laser granulometer in the particle size range 0.001 - 1 mm
  • Fiber-optic particle measurement
    • Particle speed and size
  • Determination of surfaces according to Blaine
 

► Agglomeration / briquetting / compaction

  • Briquetting and compaction of materials on roller presses
    • Roller diameter of 650 and 1,000 mm
    • Cold and hot experiments up to 750 °C
  • Agglomeration by means of a pelletizing disk / drum or intensive mixer
    • Pelletizing disk diameter up to 1,000 mm
    • Tilt and edge height adjustment
  • Quality analyses of briquettes and granules
    • Density
    • Shatter strength
    • Drum resistance
    • Point pressure resistance
    • Various abrasion resistance tests
 

► Wear investigations

  • Implementation of tests on:
    • Block on ring test machines
    • Sand blast test benches
    • Impact crushers
  • Analyses of the influencing factors (material, precursor, load, speed, etc.) on the wear process
 

► Magnetic separation

  • Implementation of magnetic separation tests by means of:
    • Strong and weak field separators
    • Permanent and electromagnetic separators
  • Measurement of magnetic fields
  • Determination of magnetic properties of materials
 

► Numerical calculations

  • Flow simulations
    • Gas flows
    • Solid-gas flows
  • Finite element calculations (FEM)
    • Stress analyses of load-bearing structures (strength assessment, weight optimization)
    • Magnetic field calculations of electro- and permanent magnets
    • Determination of natural frequencies and stress modes of unloaded and prestressed structures
    • Calculations of static and transient temperature distributions as well as thermal stress distributions
 

► Quantitative Microstructure Analyses (QMA)

  • Quantitative analysis of spatial mineralogical structures
  • Determinations of mineral structures and textures
    • Optical microscopy
    • Automated Mineral Liberation Analysis (MLA)
  • Determination of micro-fracture toughness
  • Predictions on specific wear, energy requirements, and product particle shape
 

► Further examinations

  • Hardness tests using the Vickers Micro Hardness Tester (model Shimadzu HMV-2000)
    • Determination of Vickers hardness and fracture toughness values of materials and minerals
  • Hardgrove Grindability Index (HGI) tests
    • Determination of the grindability of coal according to DIN 51742
  • Point-Load-Tests (PLT)
    • Determination of the strength of rocks (by means of the strength index Is according to the recommendation of the ISRM)
    • Compressive force up to 2,250 kN
    • Rock samples up to a maximum edge length of 500 mm
  • Zeisel tests
    • Determination of the grindability and specific energy requirements for different materials
  • Pressure and force measuring equipment
    • Calibration of pressure and force measuring equipment with forces up to 4,000 kN
  • Mixers
    • Lödige ploughshare mixer (heatable)
    • Eirich mixer (heatable)
  • Contactless temperature measurement
    • Temperature range between -50 and 1,000 °C
    • Spectral sensitivity between 8 and 14 µm