In order to cooperate with China's sustainable development strategic plan, and in response to the call of national environmental protection. In 2011, our company organized engineers and technicians who have been engaged in chromium salt production for many years to set up Raleidin Environmental Protection Management Company. After the establishment of the company, some chemical solid wastes in Tianjin, Qinghai and Hebei Province were thoroughly treated. Among them, the largest scale of treatment is in Tianjin Tongcheng Biochemical Plant. It took only one year for our team to detoxify 400,000 tons of chromium slag left over from the biochemical plant from the plan to the construction. We have solved environmental problems such as detoxification of chromium residue in Tianjin for 50 years by using self-developed wet process technology, and have trained and matured an environmental protection team that can treat solid waste and soil remediation for the whole country.