It was followed by a half an hour video on how Narwapahan mines is at the forefront of technology. It is one of the most modern trackless mine in the country with a decline (7 degrees) to underground and ramp accesses to the slopes. The use of large diesel powered underground equipment results in high productivity, eliminating fatigue of workmen and provide good working environment. Respirators, ear-muffs, safety goggles are used by workers as protection against harmful exposures. Rubber aprons, gloves, helmets and gumboots are used by persons handling toxic materials and final product. Noise levels of different machinery are reduced by many engineering control measures. The presence of students who had significant work experience (greater than 5 years) at Nuclear Power Corporation of India Limited made the discussion livelier. It was however sad to note that India is not blessed with sufficient Uranium and that the percentage of Uranium in the ore is only 0.065% approximately compared to close to 16% in mines of France and Canada.
This video session was followed by a visit to the Uranium mines. The visitors were given adequate protective gears which included knee-high rubber shoes, helmets and battery operated torches. They were led by an instructor who answered the numerous questions raised by the students. After descending down with the help of a cage, the first destination was at 295 m below the surface of the earth. The students were fascinated to see the tunnels and the illumination and the safety features present in the mines. There were heavy vehicles carrying ores and debris from one part of the mine to another. The instructor explained how the ore is transported for refinement from one point to another.
The next point was at 350 m below the surface. At this point, there were unmanned conveyor belts collecting the ore and transporting it to the crushing unit. After three stages of crushing, the ore undergoes two stages of wet grinding. The slurry thus obtained in then leached for dissolution of Uranium. The leached slurry is filtered to obtain liquid Uranium. The liquid is then precipitated from the concentrated liquor to form Magnesium Di-Uranate or “Yellow Cake”. This is the final product of Narwapahar mines. The students were awestruck by the fact that most of the operations were automated and that all these runs smoothly many meters below the surface of the earth.
The questions still followed. They ranged from Supply Chain Management, process control, maintaining high morale among the miners, Corporate Social Responsibility, safety of miners and the people who live in the nearby villages from radioactivity and so on. The students left the UCIL campus with a feeling that India would become a self reliant Nuclear power some day.
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