On July 10, 2019, 2019 (the second) national coking industry desulfurization waste liquid standardization treatment technology exchange meeting was held in Houma, Shanxi, Jiangsu Liaoyuan Environmental Protection Technology Co., Ltd. as a co-organizer to participate in the meeting; and invited industry entrepreneurs visited the site of Shaanxi Longmen Coal Chemical Co., Ltd. and the salt extraction model project.