Solar energy Co., Ltd. is located in Holland County, Indiana, USA. the coal is bituminous coal. Due to high ash content and excessive mercury and sulfur content, it cannot be sold directly. In 2015, a set of 0.6mt/a dry separation system was purchased. After separation, the ash content of cleaned coal products was reduced from 19% to 10%, the mercury content was reduced by 67%, and the sulfur content was reduced by 33%, which fully met the requirements of customers and successfully opened the market, with an annual profit of more than US $1.6 million.