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Walter Tötsch 《Environmental management》1990,14(3):333-338
Because of its toxicity, cadmium creates an environmental problem as well as a health hazard for exposed workers. Most cadmium
emissions arise from the intentional use of the element. It is therefore mandatory to reduce cadmium consumption to the lowest
possible level. Cadmium pigments, mainly used in plastic processing, can be replaced in all applications where the processing
temperature does not exceed 300°C. Newly developed polyvinyl chloride stabilizers promise to be an excellent substitute for
cadmium stabilizers in even the most demanding applications. Cadmium plating, still extensively used in the United States
and the West Germany, has been virtually abandoned in Japan. Improved lead acid batteries are replacing vented nickel cadmium
batteries because of their cost effectiveness. While in these applications cadmium use is declining, more and more cadmium
is needed for the manufacturing of sealed nickel cadmium batteries. These relatively small electrochemical cells are used
mainly by individual consumers. Here cadmium can only be replaced in some marginal applications. The high cadmium content
of these batteries (up to 22%) makes them a good candidate for recycling of the heavy metal. 相似文献
175.
C. H. Schilling S. B. Biner H. Goel J. Jane 《Journal of Polymers and the Environment》1995,3(3):153-160
Traditional methods for the shape-forming of engineering ceramics entail plastic deformation of powder slurries containing hazardous organic liquids as suspending media. Replacing these organic with aqueous media requires the development of environmentally benign, water-soluble additives which serve as plasticizers and binders. Fundamental studies were performed with aqueous suspensions of colloidal-Al2O3 to evaluate the role of sucrose and maltodextrin on viscosity, sedimentation, and filtration characteristics, plastic flow behavior of filter cakes, and sinterability. Maltodextrin systems exhibited superior results, including filtration to high packing densities and clay-like plasticity with minimal cracking.Paper presented at the Bio/Environmentally Degradable Polymer Society—Third National Meeting, June 6–8, 1994, Boston, Massachusetts.Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract W-7405-Eng-82. 相似文献
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