Special Issue; Products for Industrial Machinery - NTN

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NTN TECHNICAL REVIEW No.742006 Moldability index Lower Higher Moldability index Lower Higher Moldability index Lower Higher Lower Higher Water content wt% Fig. 13 Water content and briquette strength Lower Higher Carbon content wt% Fig. 14 Carbon content and briquette strength Lower Higher Molding pressure MPa Fig. 15 Moulding pressure and briquette strength Moldability index Lower Higher Small Large Molding speed mm/sec. Fig. 16 Moulding speed and briquette strength pressure for the briquette, the necessary formation strength can be obtained for the briquette. A lower formation speed is advantageous in attaining a higher briquette formation strength. However, the authors have selected an appropriate formation speed in consideration of the throughput of the briquetter. 3) Briquetter configuration After the pellets are loaded into the inlet hopper, a cycle consisting of metering, water spraying, loading into the die, formation and discharge is executed automatically. Through setup for optimal briquetting conditions and rationalized machine design, stable briquette strength and higher productivity are attained. The major technical data for the authors’ EAF dust briquetter are summarized in Table 1. Table.1 Main specification of dust moulder Model HDM-150 Pellets consisting of EAF dust, blended with Base materials carbon and water Briquette size Dia. 150 mm x 120 mm H, approx. 6.5 kg Cycle time 17 sec 3600 W x 5550 D x 4300 H (mm); Machine size weight: approx. 1500 tons Throughput 800 tons/month (24 hours/day operation for 30 days) Power supply 200 V, 3-phase, 50 kVA capacity 3.3 Advantages of the authors’ technology 1) A pelletizing technology to produce pellets by adding a measured amount of carbon and water to the EAF dust, useful in obtaining briquettes of stable mechanical strength (patent pending). 2) This technology provides reliable briquetting of the pellets (patent pending). 3) The briquetter can be directly connected to the pelletizer to establish a fully automated briquetting system. 4) Non-processed EAF dust is not loaded into the furnace. This helps improve the working environment. 3.4 Benefits from adoption of the authors’ briquetter 1) Prevention of EAF dust from being emitted as industrial waste and reuse of iron resources Helps achieve zero emissions 2) Elimination of binder expenses, as well as the fees for commissioning briquetting work to an outside agent First in the industry! Realization of briquetting without using a binder -78-
Honing Sludge and Electro Furnace Dust Briquetter 3) Decrease electricity expenses through improvement of melting efficiency with electric arc furnaces (in comparison to conventional EAF dust recycling) Realization by mixing in carbon and use of heavier briquettes 4) By concentrating zinc, dramatic reduction in the amount of dezincification processing Improved melting efficiency leads to simpler dezincification process, which helps realize significant cost reductions 5) Significant cost-reduction for transportation to outside agents and improved logistics Significantly reduced burden of transportation to outside agents through improvements in dezincification process, etc. 6) Improved working environment, and simpler handling of briquettes No handling of powder is needed, greatly improving the working environment 4. Conclusion Through further developments in these technologies as, described below, the authors strongly believe that NTN’s unique honing sludge briquetting technology and EAF dust briquetting technology will contribute to the mitigation of environmental impacts. Honing sludge briquetting technology This technology will be applicable to various sludge types that cannot be solidified or briquetted with a grinding sludge briquetter. NTN is currently attempting to apply this unique technology to solid-liquid separation for ultrafinish-derived sludge so as to further mitigate environmental impacts from NTN’s production activities. EAF dust briquetting technology The authors began the development work for this technology because it appeared to be advantageous in converting pellets into molded briquettes. Currently, we expect that our novel technology for directly converting powdered materials into briquettes will be commercialized and eventually adopted in various powder-solidification applications to realize the recycling of resources that were previously difficult to recover. Photos of authors Shouzo GOTOH Equipment Development Dept. Production Engineering R&D Center Kanji NAKAMURA Equipment Development Dept. Production Engineering R&D Center -79-
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88th Anniversary Special Issue; Pro
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NTN TECHNICAL REVIEW No.742006 Pref
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Trends in Recent Machine Tool Techn
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Development of a New Grease Lubrica
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High-Speed Tapered Roller Bearing f
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Minimum Quantity and Cooling Jet Lu
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Page 59 and 60: The Influence of Hydrogen on Tensio
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