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California clean-air czar's shift is new boost for diesel engines: powerful regulator sees them as an alternative for cars in global warming fight. (Industry News).(Alan Lloyd )
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For years, Alan Lloyd has regarded diesel as a dirty word, synonymous with brown haze and cancer-causing black soot. It's a view he has shared with environmental activists across the U.S.
But in a striking change of heart that could alter the kinds of cars and trucks Americans drive, the chairman of the powerful California Air Resources Board is taking a new look at diesel vehicles. He thinks they're poised to emerge as part of the solution to a different environmental problem that's gaining more attention in the U.S.: global warming.
Coming from the head ...
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The oxidation behavior of unactivated and mechanically activated sphalerite
Magazine article from: Metallurgical and Materials Transactions
; ...mechanically activated sphalerites were examined and discussed...mechanically activated sphalerite between 400 and 873K...oxidation than unactivated sphalerite. The different oxidation...mechanically activated sphalerites. The state of mechanically...10] So unactivated sphalerite transforms ...
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Effect of aging conditions on the leaching of mechanically activated pyrite and sphalerite
Magazine article from: Metallurgical and Materials Transactions
; ...mechanically activated sphalerites aged either in air...content of pyrite and sphalerite mechanically activated...activated pyrite and sphalerite on the leaching behaviors...activated pyrites and sphalerites using X-ray diffraction...activation of pyrite and sphalerite are also discussed...
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High-resolution XANES S [L.sub.3,2] edge spectra collected from a series of iron-bearing sphalerite(Zn,Fe)S minerals (1).(X-ray Absorption Near Edge Structure)(Report)
Magazine article from: Canadian Journal of Chemistry
; ...been collected from a series of high-quality sphalerite samples. Each of the sphalerite samples examined has a characteristic iron...edge spectra collected from synthetic ZnS sphalerite. The theoretical and experimental data provide...
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Examination of the proposition that Cu(II) can be required for charge neutrality in a sulfide lattice--Cu in tetrahedrites and sphalerite (1).(Report)
Magazine article from: Canadian Journal of Chemistry
; ...edge spectra of relatively pure natural sphalerite treated with mildly acidic aqueous cupric...atoms in the outermost layer of the sphalerite and to O atoms in chemisorbed water...and O at the surface of the treated sphalerite. Key words: tetrahedrite, sphalerite...
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Effect of microwave treatment on the flotation and magnetic separation properties of pyrite, chalcopyrite, galena and sphalerite
Magazine article from: Minerals & Metallurgical Processing
; ...pyrite, chalcopyrite, galena and sphalerite, were studied. Pure mineral samples...700 to 900C, while the temperature of sphalerite reached only ~130C. The floatability...was no change in the floatability of sphalerite. The magnetic properties of pyrite...
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Galena, sphalerite and associated minerals from the Tri-State district, Kansas, Missouri and Oklahoma.(Brief article)
Magazine article from: The Mineralogical Record
; ...The district became famous for spectacular examples of calcite (in crystals measuring up to 5 feet long), galena and sphalerite. More than 60 different minerals have been found in the district. Cheap foreign sources of lead and zinc coupled with an...
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Portal Intersects 400 Meters of 1-5 % Disseminated Galena-Sphalerite-Pyrite-Chalcopyrite Sulphides at El Refugio Porphyry Target.
News Wire article from: Canadian Corporate News
; ...PO-91 drilled 750 meters and 1500 meters north respectively of PO-54 were the best mineralized and intersected galena-sphalerite-pyrite and chalcopyrite as disseminations and veinlets from surface to a depth of 400 meters with a sulphide content ranging...
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Research by W. Gottesmann and colleagues in mineralogy provides new insights.
Newspaper article from: China Weekly News
; ...assemblages of rhodochrosite - sphalerite - pyrite and bustamite - sphalerite. The sphalerites show a wide range of chemical...0.32 wt%). In Stage 1 sphalerites (from the jacobsite-type sphalerite ore through Mn-magnetite...
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Mineralogical Changes Occurring during the Fluid-Bed Roasting of Zinc Sulfide Concentrates
Magazine article from: JOM
; ...sulfide concentrates, the sulfur in the sphalerite (Zn, Fe)S diffuses out of the particles...In this process, the sulfur in the sphalerite (Zn,Fe)S is converted to sulfur...sulfuric acid. Much of the zinc in the sphalerite is converted to ZnO, but a significant...
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The thermal behavior of mechanically activated galena by thermogravimetry analysis
Magazine article from: Metallurgical and Materials Transactions
; ...oxidative leaching of chalcopyrite and sphalerite, etc. [3-6] Since chemical handling...disordering in the structure of galena and sphalerite produced by intensive grinding results...of mechanically activated galena and sphalerite with hydrogen. Except for our previous...
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