Fly ash is a larger waster residue from current industry, which is coming from using in cement mixing,mortar,fillers,bricks etc... Henan Liming Road & Bridge Heavy Industry Co., Ltd. is a large manufacturer for large-scale crushing, grinding, screening mining machinery . This company pursues high standard manufacturing and qualified products. In 2005, all the products had passed the quality system certification of ISO9001: 2000. In 2007, High pressure suspension mill and Super pressure trapezium mill passed the CE certificate and entered European market. In 2007 ,The company findsthat large-scale ultra-fine milling machine has been able to achieve a one-time ultrafine materials processing by painstaking research and market practice.

After the fly ash is processed by the mill, the final fine and partical size is all uniform , surface activity is improved. If we admixture them into concrete directly, it can save a lot of cement raw materials ,improve the workability of concrete mixing materials and reinforced concrete plasticity and stability. Even some cement production enterprises have added them in the ratio of 8% ,which will be different species of fly ash blended cement clinker in the cement of final products. By now, Henan Liming Road & Bridge Heavy Industry Co., Ltd. mainly used vertical milling, trapezium mil and ball mill in processing fly ash.

As the development and utilization space of fly ash is more widely, we have much higher requires to mill machines. So the traditional Raymond Mill can not meet to deal with industrial production and the requires for final products. A new type of vertical mill and the latest trapezium mil will repace older raymond mill and become the mainstream equipment in grinding inudstry.