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Kinetics of the sulfidation of chalcopyrite with gaseous sulfur
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The sulfidation of chalcopyrite with gaseous sulfur in the temperature range of 325 C to 400 deg C occurs with the formation of covellite and pyrite as the final products. The rate of sulfidation depends strongly on the temperature, with nearly complete conversion in less than 30 minutes at 400 deg C. Microscopic analysis of partially and completely reacted particles showed that the sulfidation proceeded topochemically, with a shrinking core of unreacted chalcopyrite surrounded by successive ...
Related newspaper, magazine, and journal articles from HighBeam Research
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Kinetics of the sulfidation of chalcopyrite with gaseous sulfur
Metallurgical and Materials Transactions
; The sulfidation of chalcopyrite with gaseous sulfur in the temperature range of 325 C to 400 deg C occurs with the formation of covellite and pyrite as the final products. The rate of sulfidation depends strongly on the temperature, with nearly complete conversion in less than 30 minutes at 400 deg
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Can it do the job? PP has its backers.(Brief Article)
Plastics News
; A decade ago, Americans may not have imagined that injection molded car cups would supersede disposable paper for their trips home from the drive-through. Now thermoformers hope to change the market again, and their weapon to challenge injection molded polyethylene and polystyrene cups and
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Dramatically new PP alloys, copolymers. (polypropylene)
Plastics Technology
; Dramatically New PP Alloys, Copolymers When Himont R&D research scientist Gordon Brewer gave a technical paper at NPE on Himont's new Hivalloy polymer grafting technology, he couldn't even use the name Hivalloy. It was one of the quieter introductions of a major new alloying technology, made
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Welch Foods chooses PP for packaging.(polypropylene)(Brief Article)
Plastics News
; Welch Foods Inc. has become the first major fruit juice company to offer a polypropylene bottle to replace glass for its 10-ounce fruit juice package. PP beat out PET because it was cheaper, said Edward H. Lerner, Welch's manager of research and development and package process development. Lerner
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PP growth set to continue: but short-term overcapacity must be tackled. (polypropylene) (Plastics '92)
Chemical Week
; What distinguishes polypropylene (PP) from the other major thermoplastics is growth. PP is the youngest bulk polymer, having been developed by Montedison (Milan) in the 1950s, and has proved to be the most versatile, with applications varying from packaging films to carpet fibers, from water pipes
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Japan, Singapore FTA to Exclude PE, PP and PS.(free trade agreement, polyethylene, polypropylene, and polystyrene)(Brief Article)
Chemical Market Reporter
; JAPAN'S MINISTRY of Economy, Trade, and Industry (Meti) has decided to exclude polyethylene (PE), polypropylene (PP) and polystyrene (PS) from the list of petrochemicals imports that are to have their tariffs abolished as part of a free trade agreement (FTA) to be signed with Singapore by April
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Import duty on PP up. (Corporate Climate).(polypropylene)(Brief Article)
Indonesian Investment Highlights
; The government has set a higher import duty on polypropylene (PP) under the effective preferential tariff (CEPT) from 5% to 10% for more than three months. The decision to raise the PP import duty was announced in a decision of the finance minister on Sept. 24 to be effective as from Dec. 31.
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Interaction characterization of PA1010/PP blends using PP-g-AA as compatibilizer.
Polymer Engineering and Science
; INTRODUCTION Polyolefins and polyamides are two important classes of polymer. Polyamides are frequently blended with lower modulus polymers (1-6) to improve material properties. The addition of polyolefins lowers water absorption and reduces material costs, improves the impact resistance of
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new pp foam delivers 100% PP performance.
High Performance Plastics
; The full benefit of PP is delivered by a range of 100% PP foams introduced by the UK specialist, Zotefoams plc. The company believes that all other foams on the market at present are actually blends of PP with PE/ EVA, which are not able to deliver the full performance benefit of PP. With unique
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China will need resin despite new capacity; 10 billion pounds of new capacity slated for PE, PP.(Special Report)
Plastics News
; Byline: Frank Esposito China's dependence on imported polyethylene and polypropylene is expected to continue, even as the country plans to add almost 10 billion pounds of capacity for those materials during the next three years. Imported PE accounted for 52 percent of Chinese demand in 2004, with
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