MingShen Science GJ-1 Sealed Laboratory Sample Pulverizer
| Brand | MingShen Science |
|---|---|
| Origin | Henan, China |
| Model | GJ-1 |
| Instrument Type | Pulverizer |
| Sample Type | Hard Materials (Metals, Coal, Coke, Ores, Granular Solids) |
| Feed Size | ≤13 mm |
| Output Particle Size | 80–200 mesh (0.2 mm nominal) |
| Discharge Fineness Range | 0.01–0.5 mm |
| Loading Capacity | 100 g |
| Motor Power | 1.5 kW |
| Supply Voltage | 380 V AC |
| Weight | 120 kg |
| Dimensions (W×D×H) | 480×480×690 mm |
| Grinding Bowl Material | Manganese Steel |
| Bowl Quantity | 1 |
| Processing Time | 1–5 min |
Overview
The MingShen Science GJ-1 Sealed Laboratory Sample Pulverizer is a robust, batch-type mechanical pulverizing system engineered for rapid, consistent size reduction of hard and brittle solid samples in analytical preparation workflows. Operating on the principle of high-energy impact and compression between a rotating hammer assembly and a fixed manganese steel grinding bowl, the GJ-1 ensures minimal cross-contamination and dust emission due to its fully sealed chamber design. This architecture meets essential laboratory safety requirements for handling hazardous or volatile materials—including coal, coke, metallurgical ores, ceramic granules, and non-ferrous metal fragments—while maintaining sample integrity prior to elemental analysis (e.g., XRF, ICP-OES), proximate/ultimate analysis, or sieve-based particle distribution assessment. Its compact footprint and single-bowl configuration make it suitable for routine QC labs, geological survey units, and coal testing facilities where reproducible sub-200-mesh fineness is required per ASTM D3174, ISO 1171, or GB/T 212 standards.
Key Features
- Hermetically sealed grinding chamber with interlocked lid mechanism to prevent operator exposure and airborne particulate release during operation
- Manganese steel grinding bowl offering superior wear resistance against abrasive minerals and metallic feedstocks
- Fixed-speed induction motor (1.5 kW, 380 V AC, 50 Hz) delivering stable rotational energy for repeatable impact force generation
- Precise 100 g nominal loading capacity optimized for analytical subsampling without overloading or thermal degradation
- Adjustable processing time (1–5 minutes) enabling empirical optimization for varying hardness and friability profiles
- Compact industrial-grade chassis (480 × 480 × 690 mm) designed for benchtop integration in confined lab spaces
- No external cooling or lubrication systems required—mechanical simplicity supports low-maintenance operational continuity
Sample Compatibility & Compliance
The GJ-1 accepts feed particles up to 13 mm in maximum dimension and reliably reduces them to a nominal output range of 80–200 mesh (0.2 mm median), with practical fineness extending from 0.01 mm to 0.5 mm depending on material density, fracture toughness, and dwell time. It is validated for use with coal, coke, iron ore, limestone, bauxite, slag, and sintered metal powders. The sealed design conforms to general occupational hygiene guidelines (OSHA 1910.1200, EU Directive 2004/37/EC) for handling respirable crystalline silica and heavy metal-bearing samples. While not certified to ISO/IEC 17025 as a standalone measuring instrument, its output consistency supports method validation under GLP-compliant sample preparation protocols when paired with traceable sieve calibration (ISO 3310-1) and documented process parameters.
Software & Data Management
The GJ-1 is a manually operated electromechanical device with no embedded microprocessor or digital interface. All operational parameters—including start/stop timing, voltage stability monitoring, and maintenance logs—are recorded externally via laboratory notebook or LIMS-integrated SOP documentation. For audit readiness, users are advised to retain records of batch ID, sample origin, feed mass, grinding duration, and post-pulverization sieve analysis results. Though lacking native connectivity, its deterministic mechanical behavior ensures full traceability when integrated into FDA 21 CFR Part 11–aligned workflows through controlled procedural documentation and signature-based approval of preparation reports.
Applications
- Routine pulverization of coal and coke samples prior to ash, moisture, volatile matter, and fixed carbon determination (ASTM D3172–D3176)
- Preparation of geochemical reference materials for X-ray fluorescence (XRF) spectroscopy and inductively coupled plasma analysis
- Size reduction of metallurgical slags and furnace residues for leaching studies and heavy metal speciation
- Homogenization of brittle ceramic or refractory granules for phase composition analysis (XRD)
- Generation of standardized particulate fractions for sieve analysis validation and bulk density measurement
- Supporting ISO 5725-based repeatability studies in inter-laboratory proficiency testing programs
FAQ
What types of materials are compatible with the GJ-1 pulverizer?
Hard, dry, non-fibrous, and non-sticky solids including coal, coke, iron ore, limestone, and sintered metal fragments. Avoid wet, oily, fibrous, or highly elastic materials.
Is the GJ-1 suitable for regulatory-compliant sample preparation?
Yes—when operated within defined SOPs and coupled with calibrated sieves and documented process controls, it supports compliance with ASTM, ISO, and national coal/ore testing standards.
Does the unit require regular calibration?
No formal calibration is required; however, periodic verification of bowl integrity, hammer alignment, and timer accuracy is recommended per internal QA procedures.
Can multiple samples be processed simultaneously?
The GJ-1 is configured for single-bowl operation. Parallel processing requires separate units or higher-capacity models (e.g., GJ-2 to GJ-7).
What maintenance is necessary for long-term reliability?
Routine inspection of bowl wear, bolt torque retention, motor ventilation clearance, and electrical grounding integrity—no scheduled lubrication or consumable replacement is specified.
