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Zhong’an Jiang|Dust Distribution and Control Technology in Underground Metal Mines

Date:2017-08-02Author:
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蒋仲安W.jpg



  

Zhong’an Jiang

Professor

Ph.D Supervisor

University of Science and Technology Beijing (USTB)


Professor Jiang is a professor of the Department of Safety Science and Engineering in the School of Civil and Resource Engineering of USTB. He achieved his Ph.D at China University of Mining & Technology, Beijing, in 1994, majoring in Safety Technology and Engineering. In 1996, he began to be an associate professor right after finishing his postdoctoral work at USTB. Currently, being an academic leader for Safety Science and Engineering discipline in USTB, he is a member of the 5th National expert Committee for Work Safety specializing in coal mine dust control. He is also a member of National Committee on Standardization of Non-coal Mines and a member of China Association of Work Safety. His research and teaching interests are in the areas of theory and technology of mine dust control, mine ventilation, mine safety technology and the like. With a particular focus on dust control, Professor Jiang has applied or participated in substantial research grants including 4 National Natural Science Foundation of China, 2 Doctoral Fund of Ministry of Education of China and more than 50 projects cooperated and sponsored by the government or enterprises, of which 6 researches were given provincial or ministerial level awards. He has published over 120 research papers in refereed journals, of which 60 papers are indexed by SCI/EI, as well as 8 monographs and textbooks, and 5 patents. He has once been a senior visiting scholar to America, Australia and Taiwan.


Topic: Dust Distribution and Control Technology in Underground Metal Mines


Abstract: This paper represents an attempt to deal with the high dust concentration during mining and transporting activities in metal mines, such as drilling, blasting, shoveling, hauling, unloading and breaking process. Field investigation has first been conducted to measure the distribution of airborne dust in locations including mine faces, tunnel faces, tunnels connected to the ore unloading station, crushing chambers, belt conveyor tunnels and ore-passes. Based on the gas-solid two-phase flow theory, three-dimensional computational fluid dynamics models were developed to simulate dust movement under different conditions in areas of a mine face when blasting, an ore-pass, a crushing chamber, a belt conveyor tunnel and an ore unloading station, revealing the diffusion laws and distributions of dust. Physically-based experimental models of the tunnel face, high ore-pass and belt conveyor tunnel according to the similarity theory were additionally established to investigate the dust distribution and the airflow characteristics such as direction, velocity and pressure in the high ore-pass and connecting tunnels of corresponding mining sections, along with the verification of numerical simulation results.

Furthermore, on the basis of theoretical, experimental and numerical simulation analysis, improved kinds of gas-water atomizing nozzle, water-alone atomizing nozzle, anti-dust agent for blasting and foam agent composition, as well as a foam generator were developed for dust control. Various effective equipment and measures were proposed and applied at different locations of underground metal mines. (1)The water-stemming method was proposed to reduce the blasting smoke and dust of tunnel faces. (2) Optimized water-alone atomizing spray devices at the discharge area of crushers, foaming devices and effective ventilation system were adopted to control the dust pollution problem in crushing chambers. (3) Gas-water spraying systems were implemented for dust suppression in tunnels connected to the high ore-pass, mine faces and unloading stations.

Better dust control effect has been achieved attributed to the effective application of our research, which as a result will contribute to a safer working environment for mineworkers.