Study on optimization of the structure of product of Guojiawan Coal Preparation Plant

The economic performance of Guojiawan Plant used to be adversely affected due to production of only a few kinds of products. To deal with this situation, work is made by the plant on the production of diverse products in line with the current development of coal preparation technology and the market survey. Through adjustment of raw coal classification size and change of feed size of both heavy-medium vessel and 3-product H. M. cyclone, the plant can now produce ultralow-ash coal products. Practice shows that all the raw coal can be treated to produce the ultralow-ash coal when there is a high market demand and when the market demand shrinks, only part of the raw coal is treated to produce this product with an annual capacity reaching 1.00 million tons. The additional revenues that can be obtained per year amount to 76.5 million yuan in the former case and 22.21 million yuan in the latter case. Optimization of product mix makes it possible for the plant to operate with a higher flexibility and adaptability to change of market needs and improved coal washing efficiency and product structure.