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Applications of two electric arc plasma torches for the beneficiation of natural quartz

International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 267-273页

作者： Yuri-mikhailovich Grishin Long Miao Lev-Alekseevich Borisov nikolay-mikhailovich serykh Alexey-Yurievich Kulagin Department of Thermal physics Bauman Moscow State Technical University Federal State Unitary Enterprise Tsentrkvarts

Experimental beneficiation processes of quartz concentrate in arc plasma torches of two different types and electric powers were studied. An emission scanning electron microscope and a universal laser analyzer were used to investigate the structures as well as the size distributions of grains and microparticles. Inductively coupled plasma–mass spectrometry was used to determine the chemical compositions of nonstructural solid-phase mineral impurities in quartz concentrate. Results related to the modified grains' structure and size distribution, the compositions of impurities, and the gas–liquid inclusions in the quartz concentrate were investigated. The total impurities concentrations in the processed grains were found to satisfy the IOTA-STD standard(industry standard for grading high quality fused quartz products). The optimal condition(i.e., the optimal specific plasma enthalpy) for the production of high-purity quartz in arc plasma torches was found to depend on the geological-genetic type and the structural and textural features(i.e., chemical composition and gas–liquid inclusions) of the quartz concentrate.

关键词： low-temperature plasma beneficiation high purity quartz arc plasma torch IOTA-STD standard

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Validation of the Model Obtained Ice Drift Fields Based on Satellite Derived Data Using a Vector Correlation Indexes in an Invariant Form

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Journal of Shipping and Ocean Engineering 2017年第6期7卷 250-261页

作者： Vladimir Aleksandrovich Volkov Denis mikhailovich Demchev nikolay Evgenievich Ivanov Nansen International Environmental and Remote Sensing Center (NIERSC) Applied Meteorological and OceanographicResearch Group St. Petersburg 199034 Russia Arctic and Antarctic Research Institute (AARI) Center for Ice and Hydrometeorogical Information St. Petersburg 199397 Russia

The article considers results of validation of a sea ice modeling data using a novel methodology on the vector algebra theoretical bases. The vectorial-algebraic approach developed and was in use in Russia for an analysis of time series of vector values--wind, currents ice drift etc. The vectorial-algebraic approach allows significantly compressing the initial information and most adequately describes the vector time series of full-scale and model data restricted by a set of statistical characteristics in the invariant form. For an express analysis of correlation of the modeling data and in situ （or satellite derived） data a system of simplified correlation invariant indicators was used. This methodology was applied for validation of vector values fields at the first time. The method gives an opportunity to describe a field of a vector correlation and detect an areas with different levels of correlation between model and in situ （or other reference） vector data. The work was carried out in the frame of the My Ocean Project （FP7）.

关键词： Sea ice vector correlation model validation ice drift.

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