Yurui's limestone processing system integrates Hazemag AP-PH series impact crushers in a mechanized circuit comprising vibrating grizzly feeder → jaw crusher (150mm CSS setting) → secondary/tertiary impact crushing → multi-deck vibrating screen (45mm aperture) → belt conveyors with closed-loop recirculation. This configuration processes medium-soft rocks (≤150 MPa UCS per ISO 17892-7) including limestone, dolomite (90-150 MPa), marl (20-80 MPa), travertine (60-120 MPa), and sandstone (80-160 MPa), with moisture tolerance up to 10% depending on lithology. The impact crushing stage achieves P₉₅=45mm output (95% passing 45mm sieve, ASTM E11) through high-velocity rotor action (35-45 m/sec), leveraging interparticle collision and rock-on-metal impact mechanisms to attain 15:1 single-stage reduction ratios—eliminating tertiary crushing requirements while consuming 1.1-1.3 kWh/ton, representing 30-40% energy savings versus conventional three-stage systems. Recirculation loads are optimized to ≤15% of total throughput, ensuring grading uniformity for premium construction aggregates (＞85% cubicity index, ASTM D4791) and cement raw meal preparation (CaO ≥48% limestone feed to raw mills).
Limestone's geological significance—as China's most abundant sedimentary bedrock with 200+ billion tonne reserves (USGS 2023)—underpins its industrial criticality: as Portland clinker feedstock (70% raw meal component), ferrous metallurgy flux (BF slag basicity index 1.0-1.2), highway base course material (AASHTO M147 compliance), and micronized functional filler (d₉₀≤2μm in paper coatings). The Hazemag system's technical superiority manifests in: 1) Martensitic hammer durability (22,000-24,000 MTBF), limiting wear costs to $0.12-0.15/ton; 2) Compact footprint (25% reduction vs. multi-stage plants); 3) Environmental compliance (≤78 dB(A) per EN ISO 4871, dust ≤3.5 mg/m³ per ISO 9096, vibration ≤2.5 mm/sec RMS per ISO 10816-3).
Operational validation derives from Vietnam Cement Co.'s 2024 deployment: processing Cretaceous limestone (147 MPa UCS) at 650 TPH sustained throughput via JC546 jaw crusher and AP-PH 1415 impactor (Ø1.4×1.5m rotor), achieving 97.3% ≤40mm product at 2×355 kW power draw. The 10.8-month ROI exemplifies efficiency gains over traditional circuits. Yurui supplements this with seismic-zone structural adaptations, IoT-based predictive maintenance (vibration/temperature monitoring), and regional spare parts hubs (72-hour emergency response), all certified to EN 1009:2020, ISO 9001:2015, GOST-R TR CU 010/2011, and AS/NZS 4024.1201:2014 for global project deployment.
