New Ideas for Recycling and Utilization of Carbide Slag

A few days ago, Yili Jieneng released the third quarter of 2017 data announcement. Reporters found that since this year, the company's chemical industry sector has achieved good business performance, chemical products production and marketing are booming, revenue and net profit have increased substantially, cost control has been effective. In addition to the overall improvement of the prosperity of the chemical industry, what other "secret tricks" does Yilijie have in the chemical industry? With this doubt, the reporter came to Dalat Industrial Park where Yilijie Chemical Company is located to interview. Innovation is the inexhaustible motive force for the transformation and development of enterprises. Through technological innovation, we can continuously improve the transmission function of the Circular Industrial chain, which is the way Yilijie can see. Li Yonghong, executive vice president of Yili Clean Energy Base, said. Traditional chemical industry is not "traditional". Take CALCIUM carbideslag recycling as an example. If waste Calcium Carbide slag is stored in slag yard for a long time, it not only occupies precious land resources, but also is very easy to dry fly ash, which requires a lot of funds to maintain and control. This is a big problem faced by all PVC enterprises using calcium carbide acetylene method. "Turn waste into treasure and eat from the garbage dump. Yili Jieneng Chemical Company has put forward new ideas.

"863 Science and Technology Project" has the demonstration of subverting the industry

Turning problems into opportunities and negative assets of carbide slag into positive assets that can generate GDP. Under the guidance of this concept, Yilijie has taken the Lead in developing a number of new technologies in China, such as the preparation of activated calcium oxide from carbide slag and the recovery of acetylene gas from carbide slag slurry.

In the acetylene plant, the reporter saw a set of equipment consisting of vibrating screen, separator and so on. "This is the project of preparing active calcium oxide from calcium carbide slag implemented by Yili Chemistry in cooperation with the Chinese Academy of Sciences and East China University of Technology. Through pretreatment and calcination technology, calcium carbide slag can be made into active calcium oxide, which can be reused in the production of calcium carbide to completely solve the utilization problem of waste calcium carbide slag." Yili technician Hao Ruyi introduced to reporters that the project belongs to the national "863 science and technology project".

At present, the pilot test of 10,000 tons of this project has been completed, and it passed the acceptance of China Agenda 21 Management Center once and for all on June 29 this year. The Expert Group believes that the project has pioneered a new idea of recycling "calcium carbide - PVC - calcium carbide slag - calcium carbide", which has the industry demonstration function of subverting the industry and is a good project for the benefit of state-owned enterprises. It is not easy for Yili Chemicals to complete the project construction and produce high quality products in a short time. It has established a good image for the company and found a new breakthrough for the problem of carbide slag treatment. At the other end of the acetylene plant is the carbide slag slurry volatilization tank, where a large amount of waste slag slurry discharged from the generator is collected, and the hot gas transpires and evaporates naturally. "These carbide slag slurries contain not only saturated acetylene gas, but also some unreacted calcium carbide particles. Natural volatilization, both flammable and explosive potential hazards, and white loss of some energy. Hao Ruyi pointed to a 10-meter-high reactor standing next to him. "This is the project of acetylene gas recovery from bottom slag of generator developed by Yili Chemistry and related companies. Carbide slag slurry is used to recover acetylene gas by special conveying equipment."

At present, the project is in a tense test run stage. It is estimated that 600,000 standard cubic meters of acetylene gas can be recovered annually after commissioning, and the annual recovery income can reach several million yuan, which not only achieves the purpose of reducing pollution and increasing efficiency, but also conforms to the principle of "reduction, resource utilization and reuse" of circular economy.

It is known that Yili Jieneng Dalat Industrial Park has formed a closed cycle and coordinated development industrial chain in the top design for a long time. The whole park is laid out according to the integrated cycle industrial chain of "coal-gangue power generation-ionic membrane caustic soda-calcium carbide-industrial waste cement-chemical synthetic fiber new materials", so as to make the resources use up. To maximize. Nowadays, enterprises, factories and even production links in the park are intensifying technological innovation and striving to form more and finer circle chains through R&D. "It's like the rotation and rotation of the earth, which rotates in different systems and finally forms a set of reasonable and orderly celestial bodies." Zhang Guojie, chief engineer of Yili Chemistry, said vividly. The report of the Nineteenth National Congress of the CPC pointed out that innovation is the first driving force for development and the strategic support for building a modern economic system. Establish and improve the economic system of green and low-carbon cycle development, and promote the comprehensive conservation and recycling of resources. Over the past three years, Yili Chemistry has invested nearly 300 million yuan in technological innovation and transformation, with more than 10 major technological transformation projects annually. Up to now, the company has obtained more than 20 national patents, the product quality and production efficiency have been greatly improved, and the cost control has been significantly improved. After continuous innovation and industrial upgrading, and continuous intensive cultivation in the field of chemical industry, Yili Jieneng Chemical Company has become a benchmark enterprise in the same industry and an important production base of circular economy in China.