Essays about: "svavelsyra"

Showing result 1 - 5 of 12 essays containing the word svavelsyra.

  1. 1. Practical strategies for acidification of animal slurry in storage

    University essay from SLU/Dept. of Soil and Environment

    Author : Emil Larsson; [2018]
    Keywords : buffer capacity; foam; NH3 emission; pH evolution; sulphuric acid;

    Abstract : Animal slurry is a source of NH3 emissions which results in loss of N and decrease the nutritive value of slurry. Slurry stores in Sweden represents approximately 30% of total NH3 emissions from agricultural activities in the country. READ MORE

  2. 2. Leaching of Pyrrhotite from Nickel Concentrate

    University essay from Luleå tekniska universitet/Industriell miljö- och processteknik

    Author : Filip Abrahamsson; [2017]
    Keywords : Leaching; Pyrrhotite; Nickel Concentrate; Pentlandite; H2SO4; sulfuric acid; non-oxidative; acid leaching; Lakning; Magnetkis; Nickelkoncentrat; Pentlandit; H2SO4; svavelsyra; icke-oxidativ; syralakning;

    Abstract : Non-oxidative acid leaching of pyrrhotite from Kevitsa’s Ni-concentrate and methods to recover by-products, have been investigated. Selective dissolution of pyrrhotite (Fe1-xS, 0<x<0.25) can enrich the content of the valuable metals, such as Ni and Co, in the final concentrate and will reduce the amount of Fe and S sent to the smelters. READ MORE

  3. 3. Acid Sulfate Soils and Metal Accumulation in Sediments in Rosån Catchment, Northern Sweden

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Carola Lindström; [2017]
    Keywords : Acid sulfate soils; increased metal concentrations; anthropogenic activity; Sura sulfatjordar; ökade metallkoncentrationer; mänsklig påverkan;

    Abstract : Global environmental concerns arise when marine deposits with fine-grained iron sulfide-rich sediments (FeS and FeS2), now situated above sea level, oxidize from anthropogenic lowering of the groundwater table. The oxidation of iron sulfides decreases the soil pH and the acidic environment of these Acid Sulfate Soils (AS) soils increase weathering and mobilization of metals into adjacent watercourses, lakes and estuaries. READ MORE

  4. 4. How Do Long-Term Declines in Anthropogenic Sulfur Dioxide Emissions and Sulfate Wet Deposition Compare with Trends in Freshwater Chemistry in Scandinavian Rivers?

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Linnea Georgii; [2017]
    Keywords : sulfur dioxide; SO2; SO42-; river chemistry; Scandinavia; Sweden; Norway; svaveldioxid; SO2; SO42-; vattendrag; Skandinavien; Sverige; Norge;

    Abstract : Acidification of precipitation is an important environmental problem that emerged during the past century, especially after the Second World War. Acidification was primarily caused by human-made emissions of SOx (mostly SO2) and NOx, which are oxidized sulfur and nitrogen gases. READ MORE

  5. 5. Membrane evaluation and thermal modelling of the vanadium redox flow battery

    University essay from Lunds universitet/Kemiteknik (CI)

    Author : Anders Kronander; [2016]
    Keywords : thermodynamics; Thermal; Simulation; Energy storage solutions; Modelling; VRB; Vanadium; Battery; chemical engineering; kemiteknik; Technology and Engineering; Chemistry;

    Abstract : In this study, different membranes were tested for their use in a vanadium redox flow battery (VRB). The membranes were first tested under charge-discharge operation of the VRB over four charge-discharge cycles at different current densities (20 mAcm-2, 40 mA cm-2 and 60 mAcm-2) and the corresponding cell performance was evaluated in terms of total energy efficiency (EE), coulombic efficiency (CE) and voltage efficiency (VE). READ MORE