Search for dissertations about: "iron sulphide"

Showing result 1 - 5 of 30 swedish dissertations containing the words iron sulphide.

  1. 1. Microscopy of high temperature oxidation of iron and some stainless steels

    Author : Torbjörn Jonsson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; water vapour; sulphur dioxide; FIB; X20; stainless steel; 353MA; EDX; KCl; FIB SEM; SEM; microstructure; TEM; iron; High-temperature oxidation; in-situ ESEM;

    Abstract : This thesis concerns the high temperature oxidation of iron and some stainless steels. The oxide scales, as well as the subjacent metal, were investigated using a range of electron and ion microscopy techniques, including SEM, TEM, EDX and FIB. The aim was to link the microstructural observations to the oxidation mechanisms of the materials. READ MORE

  2. 2. The chemistry of flotation activation and depression of iron-containing sulphide minerals

    Author : Xianghuai Wang; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mineralteknik; Mineral Processing;

    Abstract : Thermodynamic calculations, electrochemical techniques, flotation and adsorption tests were used to study the physico-chemical principles involved in the flotation, activation and depression of the common ironcontaining sulphide minerals. Thermodynamic calculations on iron-xanthate-sulphur-water systems indicate that insoluble ferric hydroxo- xanthates can be obtained at a very low xanthate concentration in the neutral to weakly alkaline pH range, in which no liquid dixanthogen is formed. READ MORE

  3. 3. Flotation chemistry of complex sulphide ores : recycling of process water and flotation selectivity

    Author : Fatai Kolawole Ikumapayi; Jaakko Leppinen; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mineral Processing; Mineralteknik;

    Abstract : Recycling of flotation effluents through the ore processing plant is one of the ways of reducing both plant-operating costs and industrial impact onto the local ecosystem. Such waters named acid mine drainage (AMD), if discharged from sulphide flotation are gypsum (CaSO4.H2O) saturated and have a high salinity (on the order of 1000 ppm). READ MORE

  4. 4. Quantitative equilibrium calculations on systems with relevance to copper smelting and converting

    Author : Bo Björkman; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Assessment of silicate systems; model for liquid silicates; lead silicates; iron silicates; cuprous silicates; quantitative equi¬librium calculations; emf measurements; Gibbs free energy; cup¬rous sulphide; dicalcium ferrite; wüstite-calcia solid solution; copper smelting and converting;

    Abstract : The present thesis gives a summary of results obtained through theoretical and experimental studies of systems with relevance to copper smelting and converting.Many chemical elements are involved in the copper production pro­cesses and a detailed experimental study would be very time- consuming and expensive. READ MORE

  5. 5. Transformation of iron constituents during early diagenesis : in situ studies of a Baltic Sea sediment-water interface

    Author : C. H. Magnus Lindström; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The aim of the present study was to elucidate the mechanisms and kinetics of the transformation of iron constituents at the sediment-water interface and their interaction with other element cycles during early diagenesis, with emphasis on their relations with oxygen, phosphorus and sulphur. The investigation was carried out in situ at 10 m water depth on a nearshore Baltic Sea soft bottom sediment. READ MORE