On the morning of November 13, 2019, a team of 5 experts in clean and civilized production came to the company for on-site evaluation. The relevant person in charge of the company reported on the implementation of no/low-cost solutions in recent years, and the next step was to propose the progress of powder flow for medium/high cost solutions. The expert group conducted an on-site inspection of the company and highly praised the company's environmental protection investment in recent years. They also hope that the company can improve ecological environment protection, effectively reduce pollutant emissions, achieve zero wastewater discharge, and establish an environmental protection model of "green chemistry".