The researchers found a way to turn coal waste into a special fuel called coal-water slurry. They used coal leftovers to make a fuel with the right thickness and energy levels for burning in boilers. This new process can make a kind of fuel that has 56-60% coal in it and can produce a lot of heat when burned. They also made plans for a small model of this process that could be used at power plants to recycle waste coal. By doing this, they figured out a great way to use up leftover coal from coal plants, which can help save money and be better for the environment.