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Sökning: swepub > (1990-1994) > (1994) > Nilsson L.

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  • Nilsson, L., et al. (författare)
  • Iron and arsenic removal from bacterial leaching effluents by precipitation with limestone
  • 1994
  • Ingår i: Scandinavian journal of metallurgy. - 0371-0459 .- 1600-0692. ; 23:4, s. 184-189
  • Tidskriftsartikel (refereegranskat)abstract
    • By bacterial leaching of bulk concentrates of complex sulphide ores, acid leachates are produced which besides valuable metals as zinc and copper also contain high concentrations of impurities such as iron and arsenic, In order to evaluate the proper conditions for removal of iron and arsenic by precipitation as ferric arsenate with limestone, a series of batch precipitation experiments was conducted at various pH values in the range 2-6. The results from these tests showed that pentavalent arsenic and ferric iron can be effectively precipitated to low concentrations when the precipitation is carried out at pH 3 without causing losses of zinc; however, the ferrous iron, approximately 1 g/l, remains in solution. When the precipitation is carried out at pH above 3 in order to oxidize ferrous iron, unacceptable high zinc losses were obtained.
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  • Wilhelmsson, B, et al. (författare)
  • An Experimental Study of Contact Coefficients in Paper Drying
  • 1994
  • Ingår i: Tappi Journal. - 0734-1415. ; 77:5, s. 159-168
  • Tidskriftsartikel (refereegranskat)abstract
    • The influence of different dryer fabrics on the contact coefficient has been studied experimentally under various conditions. A bench-scale drying apparatus, in which the fabric could be fixed at variable tensions, was used in the experiments. A technique for measuring the heat flux and surface temperatures of the paper sample and the hot surface was developed. Three paper grades were used in the investigation: newsprint, fine paper, and liner The key parameters affecting the heat transfer were found to be the moisture content of the sheet and the hot surface temperature. The applied fabric tension, the number of contact points and the contact area of the fabric did not have significant influence on the heat transfer in the 2-6 kN/m fabric tension range investigated. An extensive review of the literature on contact coefficients was conducted. It showed a very large scattering of results, due mainly to different experimental conditions and techniques.
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