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Research on separation mechanism of coal gangue photoelectric sorting recognition

Zhou Wei, Wang Haoyu, Wang Lingling, Feng Anan, Li Liansheng, Zhu Jinbo

Physicochemical Problems of Mineral Processing

2024

Vol. 60, iss. 4

art. no. 192417

Efficiently realizing the separation of coal gangue is a hot issue in coal preparation. To solve this problem, this paper proposes research on the identification and separation of minerals in coal gangue based on dual-energy X-rays, and conducts experimental research on four single minerals and several different composite minerals in coal based on the identification technology in the sorting process of the system, and conducts a simulation study on the jet separation simulation for the separation technology in the separation process of the system. Based on the coal gangue photoelectric separation test platform, the main minerals in coal gangue were analyzed. Based on MATLAB software, the grey value of the mineral was obtained, the curve between the grey value and the thickness was made, the mass absorption coefficient of the mineral in the high and low energy regions was obtained by regression analysis, and the R value identification threshold of single mineral and composite mineral was established, which provided a theoretical basis for the accurate identification of coal gangue. The parameters of the jet nozzle were analyzed and optimized through fluid simulation, and the optimal parameters for the rapid separation of coal gangue were determined.

Effect of ethanol-assisted mixing on the selected properties and homogeneity of NR/BR blends

Meng Chao, Gu Zheng, Sui Jinyong, Wang Jianfa, Li Peiyao, Hu Shaokai, Zhang Susu, Zhang Xiaoyi, Wang Haoyu, Han Shaolong, Yang Zhifei

Polimery

2023

Vol. 68, nr 3

142--148

The effect of the mixing method (normal and ethanol-assisted) on selected properties of natural rubber with butadiene rubber blends (NR/BR 80/20) was investigated. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) were used to evaluate the properties. In addition, the mechanical tensile properties, tear resistance and thermal aging, as well as vulcanization characteristic were determined. It was found that ethanol-assisted mixing can significantly improve the mechanical properties and thermal stability of the blends as a result of better dispersion of additives in the rubber matrix.

Zbadano wpływ metody mieszania (tradycyjna i wspomagana etanolem) na wybrane właściwości mieszanin kauczuku naturalnego z kauczukiem butadienowym (NR/BR 80/20). Do oceny właściwości zastosowano skaningową mikroskopię elektronową (SEM), spektroskopię w podczerwieni z transformacją Fouriera (FTIR) oraz analizę termograwimetryczną (TGA). Ponadto oznaczono właściwości mechaniczne przy rozciąganiu, odporność na rozdzieranie i starzenie termiczne, a także właściwości wulkanizacyjne. Stwierdzono, że mieszanie wspomagane etanolem może znacząco poprawić właściwości mechaniczne i stabilność termiczną mieszanin NR/BR, jako efekt lepszej dyspersji dodatków w osnowie gumowej.

Thermodynamics-based measurement of the velocity of high-temperature smoke

Wang Haoyu

Archives of Thermodynamics

2023

Vol. 44, no 1

23--36

In view of the high cost and difficulty of ensuring the accuracy in the measurement of fire smoke velocity, the measurement system developed using platinum resistance temperature detectors and an 8-bit microcontroller, is used to realize the fast measurement of high-temperature fire smoke velocity. The system is based on the thermodynamic method and adopts the Kalman filter algorithm to process the measurement data, so as to eliminate noise and interference, and reduce measurement error. The experimental results show that the Kalman filter algorithm can effectively improve the measurement accuracy of fire smoke velocity. It is also shown that the system has high measurement accuracy, short reaction time, low cost, and is characterized by high performance in the measurement of high-temperature smoke velocity in experiments and practice.