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Magnetic treatment technology with easy to use features and non-toxic pollution, set scaling, cleaning, corrosion sterilization and other functions in one, is a promising method of water treatment; dispersant having POLYASPARTIC phosphate-free, biodegradable, good environmental compatibility, etc., is an inhibitor class represents the development direction of polymers. In this thesis, the conductivity analysis, X-ray diffraction, scanning electron microscopy and infrared spectroscopy on a more comprehensive field conditions CaCO 3 crystal crystallization process and its changes were studied; utilize poly aspartic acid, PESA and magnesium ions, combined with magnetic treatment on the crystallization of calcium carbonate polymorphs change processes and conducted in-depth research, its mechanism was discussed, for chemical - physical joint processing technology provide a theoretical basis, the text is divided into six chapters. Chapter I: Introduction. Magnetic treatment technology over the years, scale dispersant poly-aspartic acid, and magnesium ions PESA studies were reviewed, and the purpose of this thesis and significance are described. 60 total citations. Chapter II: Analytical methods. Used in this paper analysis methods, including electrical conductivity method, X-ray diffraction, scanning electron microscopy and infrared spectroscopy principle, the instrument test conditions and data processing methods are introduced. Chapter Three: magnetic field on the crystallization of calcium carbonate polymorphs process and impact studies. Magnetic treatment in different conditions of CaCO 3 crystallization process and its polymorphs, etc. were investigated, the results show that the magnetic treatment can promote CaCO 3 of the crystallization process for and promote the transformation of calcite to aragonite. Chapter 4: PESA and magnetic studies on the effects of calcium carbonate. In different concentrations of PESA presence of magnetic field on CaCO 3 crystal and its PESA scale suppression mechanism was discussed, the results show that PESA inhibited CaCO 3 of crystallization of calcium carbonate scale formation reduced; adding PESA and after magnetic treatment conditions, CaCO 3 grain structure fracture particle distribution is more loosely, so difficult piled into hard scale, indicating PESA played a synergistic effect of the magnetic field. Chapter Five: PASP and field studies on the effects of calcium carbonate. In different concentrations of PESA presence of magnetic field on CaCO 3 crystal form and its polyaspartic acid scale inhibition mechanism was discussed, the results show that the polyaspartic acid inhibits CaCO 3 crystals, making the final produce calcium carbonate scale reduction, polyaspartic acid on calcium carbonate has some lattice distortion, so that the resulting CaCO 3 to vaterite crystal; added polyaspartic acid and magnetic treatment conditions, the sample Chinese stone, vaterite and calcite three crystal types coexist, CaCO 3 more irregular crystal form, and more difficult to form hard scale formation. Chapter VI: Mg 2 and the magnetic field on the impact of calcium carbonate polymorphs. In different concentrations of Mg 2 in the presence of magnetic fields on CaCO 3 crystal form and its Mg 2 of scale inhibition mechanism was study showed that, Mg 2 concentrations higher than 0.5 mmol · L -1 when calcite formation has a strong inhibitory effect, and magnetic and Mg 2 a synergistic effect.
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