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Tiit Kaljuvee Jekaterina Jefimova Valli Loide Mai Uibu Marve Einard 《Journal of Thermal Analysis and Calorimetry》2018,132(1):47-57
The power and heat production in Estonia is based over 90% on the combustion of a local solid fossil fuel—Estonian oil shale (OS), and at that 7–8 million tons of OS ash are formed annually. One promising possibility for large-scale utilization of cheap alkali ashes is the liming of acidic soils. In Estonia, there is 350,000 ha of agricultural land that needs permanent liming. To eliminate possible environmental contamination at liming of soils the oil shale ashes should be granulated. Thermal analysis was used for determination of the relationships between physico-mechanical and physico-chemical characteristics of granulated products and the post-granulation treatment conditions. For determination of leachability of ash components, the granulated products as well as the origin ashes were tested using laboratory lysimetries. Depending on OS ash and different post-granulation treatment used, it was possible to obtain granulated product with compressive strength between 5 and 15 N per granule. The leaching of Ca2+ decreased up to 26 and 34%, SO4 2? 70 and 53%, Mg2+ and K+ up to 7–12% for granulated CA and ESPA, respectively, comparing with original ashes. The results of soil analysis indicate that the use of OS ashes improved the pH level of soil significantly. pH increased equally with initial and granulated ash: from 4.7 up to 6.4 and 5.8, respectively, using for that CA and ESPA. Prolonged effect of soil neutralizing ability by granulated product (if compare with fine ashes) was proven by decrease in the content of leached ions in filtrate solutions as well as not mobile ions in soil. 相似文献
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Kaljuvee Tiit Tõnsuaadu Kaia Traksmaa Rainer Einard Marve Jefimova Jekaterina Petkova Vilma 《Journal of Thermal Analysis and Calorimetry》2020,142(1):437-449
Journal of Thermal Analysis and Calorimetry - Thermal behaviour of shelly Estonian phosphorite ores from Iru, Toolse, Ülgase deposits and their concentrates have been studied. The... 相似文献
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Kaljuvee Tiit Štubňa Igor Húlan Tomáš Csáki Štefan Uibu Mai Jefimova Jekaterina 《Journal of Thermal Analysis and Calorimetry》2019,138(4):2635-2650
Journal of Thermal Analysis and Calorimetry - The influence of two different oil shale ashes formed, respectively, at pulverized firing and at circulated fluidized bed combustion of Estonian oil... 相似文献
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