Abstract: Through a comprehensive analysis the reason of lump coal breaking in the process of washing and transportation, this paper puts forward a whole set of methods to decrease the broken rate and gives the calculation method and formula of lump coal mixing with small coal. In the practical application of coal preparation plant, under the current production conditions, the problem of lump coal breaking in the process will be effectively relieved if the port or the user puts to use the theory of lump coal mixing with small coal. Industrial tests show that, when the small coal blending ratio of 20%, the lump coal rate can be increased by 19%.And also this method takes an active part in the promotion of coal washing's additional benefit.

Key words: Lump Coal Transportation, Anti-fracture Technology, Lump Coal Mixing with Small Coal, The Theory of Computation