Issue34

Q. Like et alii, Frattura ed Integrità Strutturale, 34 (2015) 543-553; DOI: 10.3221/IGF-ESIS.34.60 552 liberation methods, that is, the smaller the mineral crystal is, the harder the selection of mineral crystal becomes, and the more energy is consumed. C ONCLUSIONS his study takes the mineral consisting of galena and calcite as the research object to establish a two-dimensional plane strain model and analyze the effects of microwave irradiation time, power density, mineral content, and mineral crystal size on microwave-assisted mineral liberation. It draws the following major conclusions: (1) Under the microwave irradiation, mineral boundary can be quickly destroyed in a specific period. An optimal irradiation period exists. When irradiation time is shorter than the beginning time of the optimal irradiation period, no failure occurs on the mineral boundary. By contrast, when irradiation time is longer than the end of the optimal irradiation period, more energy is wasted. (2) A greater microwave power density reduces the period for mineral boundary failure completion. The microwave irradiation time and energy consumption can be effectively reduced by improving the microwave power density. However, when the microwave power exceeds a certain value, the microwave irradiation period and energy consumption slightly change. (3) With the same microwave power density, when the mineral crystal size is constant, the mineral content has no effect on the optimal microwave irradiation time, and the beginning and completion times of failure exhibit no change. Moreover, mineral crystal size significantly affects the microwave irradiation time and energy consumption; the larger the mineral crystal, the shorter the irradiation time is, and the less energy consumption the mineral boundary failure requires. When the mineral crystal size exceeds a certain value, both irradiation time and energy consumption essentially remain unchanged. A CKNOWLEDGEMENTS his work was supported by the China Postdoctoral Science Foundation (2015M572580), the Foundation of Shaanxi Educational Committee (15JK1471), and the National Natural Science Foundation of China (No. 51174159). R EFERENCES [1] Jin, Q., Microwave chemistry. Science Press, Beijing, (1990) 214-216. [2] Duan, B., Zeng, L., Liu, P., Application and situation of microwave-assisted heating technology, Ceramics, 12(3) (2005)11-15. [3] Islam, M. M., Design of a microstrip antenna on duroid 5870 substrate material for ku and k-band applications. Tehnicki Vjesnik, 6(2) (2013) 71-77. [4] Lubikowski, K., Seebeck phenomenon, calculation method comparison, Journal of Power Technologies, 95(1) (2015) 63-67. [5] Czaplicka, K., Korol, K. B., et al., Model of eco-efficiency assessment of mining production processes, Archives of Mining Sciences, 1(2) (2015) 477-482. [6] Kingman, S. W., Vorster, W., Rowson, N. A., The influence of mineralogy on microwave assisted grinding, Minerals engineering, 22 (1) (2015) 160-163. [7] Zhong, L., Nano-structured Si/C/N composite powder produced by radio frequency induction plasma and its microwave absorbing properties, Journal of Engineering Science and Technology Review, 13(3) (2000) 313-327. [8] Liu, Q., Xiong, Y., Research on application mechanism of microwave in iron ores selective grounding, Yunnan Metallurgy, 6 (3) (1997) 25-28. [9] Kingman, S.W., Rowson, N.A., Microwave treatment of minerals- a review, Minerals Engineering, 11(11) (1998) 1081- 1087 [10] Kingman, S. W., Jackson, K., Recent developments in microwave assisted combination, International Journal of Mineral Processing, 74 (2004) 71-83 T T