Search for dissertations about: "hydrogen sulphide"

Showing result 1 - 5 of 21 swedish dissertations containing the words hydrogen sulphide.

2. 1. Sulphide mineral flotation : a new insight into oxidation mechanisms

   Author : Alireza Javadi; Jan D. Miller; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mineralteknik; Mineral Processing;

   Abstract : Formation of hydrogen peroxide (H2O2), an oxidizing agent stronger than oxygen, by sulphide minerals during grinding was investigated. It was found that pyrite (FeS2), chalcopyrite (CuFeS2), sphalerite ((Zn,Fe)S), and galena (PbS), which are the most abundant sulphide minerals on Earth, generated H2O2 in pulp liquid during wet grinding in the presence or devoid of dissolved oxygen in water and also when the freshly ground solids are placed in water immediately after dry grinding. READ MORE

4. 2. Synchrotron radiation studies of gas phase molecules : from hydrogen to DNA sugars

   Author : Gemma Vall-llosera; Elisabeth Rachlew; Stacey Sorensen; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; KTH thesis; synchrotron radiation; gas phase; bio molecules; Atomic and molecular physics; Atom- och molekylfysik;

   Abstract : This thesis summarises experimental results on the molecular spectroscopy of gas phase molecules excited by synchrotron radiation in the VUV and soft X-ray regions. We have used three different detection techniques, photon induced fluorescence spectroscopy, photoionisation mass spectroscopy and near edge X-ray absorption fine structure spectroscopy to study molecular deuterium, hydrogen sulphide, ammonia, methanol, pyridine, pyridazine, pyrimidine, pyrazine, s-triazine, and 2-deoxy-D-ribose, the last one also known as the DNA sugar. READ MORE

5. 3. MEMS-based electrochemical gas sensors and wafer-level methods

   Author : Hithesh K Gatty; Göran Stemme; Roxhed Niclas; Anita Lloyd Spetz; KTH; []
   Keywords : MEMS; gas sensors; electrochemical; nitric oxide; hydrogen sulphide; nafion; nano;

   Abstract : This thesis describes novel microel ectromechanical system (MEMS) based electrochemical gas sensors and methods of fabrication.This thesis presents the research in two parts. In the first part, a method to handle a thin silicon wafer using an electrochemically active adhesive is described. READ MORE

6. 4. The effects of fines content and hydrogen sulphide gas pre-treatment on kraft pulping and the strength of polysulphide pulps

   Author : Elisabet Brännvall; KTH; []
   Keywords : Bleachhability; Delignification; Fines; Hydrogen sulphide pre-treatment; Kraft pulping; Mechanical properties; Polysulphide; Softwood; Yield; NATURAL SCIENCES; NATURVETENSKAP;

   Abstract : .... READ MORE

7. 5. Sulphide Minerals: Surface Oxidation and Selectivity in Complex Sulphide Ore Flotation

   Author : Alireza Javadi; Dee Bradshaw; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mineralteknik; Mineral Processing;

   Abstract : Metal and energy extractive industries play a strategic role in the economic development of Sweden. At the same time these industries present a major threat to the environment due to multidimensional environmental pollution produced in the course of ageing of ore processing tailings and waste rocks. READ MORE