Practice of renovation of the middlings upgrading system at Tianzhuang Coal Preparation Plant

In order to adapt to the change of the current coal market, effectively increase the calorific value of the fine middlings and cope with the adverse effect on plant operation and marketing of coal products imposed by the difficulty in finding the market for fine middlings, work is made on the renovation of the small coal cleaning system and corresponding transportation and loading facilities. The operation of the renovated systems has led to the increase of the calorific value of fine middlings from 6.29 MJ/kg to 12.56~15.91 MJ/kg and, hence, the finding of a market for such a slow-selling product. Moreover, this not only brings forth an additional economic gain by over 100million yuan, but also successfully tackles the problems relating to the supply of fuel coal for slime thermal drying system and railway transportation of dried product.