Microwave properties of materials with dolomite and ilmenite structures
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Ilmenite
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tar (computing)
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To investigate the possibilities of utilization of dolomite large size fractions (dropouts) and their effect on plants a five-year experiment was set in 2015. A fertilization value of large fractions (5–7 and 7–10 mm) of dolomite in two doses was studied. The biomass yield of crops in dolomite dropout treatment was around 90% from the treatment using dolomite flour (control). Losses of bases from the soil treated with high doses of dropouts did not exceed the migration losses of the treatment with dolomite flour. Dynamics of dolomite flour dissolution in the soil was empirically modeled. The data prove that high doses of the large-sized dolomite fractions act similarly to standard dolomite flour and have more persistent effects on soil and plants.
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Abstract The formation of dolomite is poorly understood and highly controversial, since well‐ordered dolomite has never been synthesized under earth surface conditions and natural occurrences of modern dolomite have been reported only rarely from restricted sedimentary environments. It is generally accepted that dolomite does not form in soils. This study investigates the characteristics and origin of dolomite in a sulfatic saline soil in east‐central Alberta, Canada, in which dolomite makes up more than half of the <2‐µm fraction. X‐ray diffraction analysis shows that the dolomite is stoichiometric and ordered, with only slight deviations in unit cell parameters relative to ideal dolomite. The clay‐sized dolomite is enriched in 18 O and depleted in 13 C relative to detrital dolomite and dolomite present in larger size fractions, and has a radiocarbon age ranging from 1270 to 5270 yr before present, clearly indicating an authigenic origin. The very small dolomite particle size and differences in isotope content from coexisting calcite suggests that the dolomite formed by direct precipitation in the soil rather than by dolomitization of a preexisting calcite.
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Qinghai Lake is the largest inland saline lake in China.In order to search for the mechanism of dolomite formation,a sediment column with 25 cm long was collected from the bottom of the lake at approxmately 15 km north to the Erlangjian.It has been discovered that there is 2.2% dolomite in the sediments through the analysis of X-ray diffraction.Some researchers also reported a 10% dolomite content in the sediments.SEM images show that the dolomite take the shape of the spheric aggregations with the diameter of 1—2 μm,associated with the pyrite aggregations at the similar size.The characteristics of these dolomite and pyrite aggregations are very similar to those microbal origin of dolomite discovered in the modern high saline lagoons and tidal flats.This is the first discovery of this kind of dolomite in the inland lake with low salinity,which is high significant to search the mechanism of dolomite formation and to understand the famousdolomite problem.
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Two kinds of common dolomite plasters obtained from the market and one of gypsum plaster were mixed in several proportions, and these mixed special gypsum-dolomite plasters were tested on their various properties, i.e., (a) bending and compressive strengths, (b) shrinkage cracks, (c) hardness, (d) fineness, etc., which results were proved to be clearly superior than those of common simple dolomite plaster.Nextly, samples of special mixed gypsum-dolomite plaster were obtained by adding dilute sulphuric acid solution to calcined dolomite powder. By this reaction of dilute sulphuric acid to calcined dolomite, the common dolomite plaster was obtained on the one side, and gypsum crystal was obtained simultaneously on the other side, which changed to hemi-hydrated gypsum plaster by the slaking temperature of calcined dolomite with dilute sulphuric acid solution above mentioned.These special mixed gypsum-dolomite plasters were proved to be of superior quality by the comparative testings of common dolomite plaster. These studies are now being continued to prepare these special mixed gypsum-dolomite plasters from several dolomite samples obtained and collected from various places, i.e., Kuzuu, Nogami and Nabeyama in Tochigi Prefecture, Ibuki in Gifu Prefecture, Irino in Okayama Prefecture, etc., which results will be reported in the next papers.
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