What is the method for industrial production of calcium carbide?

However, with the rise of petrochemicals, acetylene for organic chemicals has gradually been provided by petrochemicals. Calcium carbide is used in acetylene generators for metal cutting and welding. Calcium carbide lamps are used as light sources in places without electricity. In industry, calcium carbide is heated in ammonia to produce calcium cyanamide, which is a nitrogen fertilizer, plant defoliant and herbicide. With the development of acetylene chemical industry, China's calcium carbide production has increased from 3,000 tons in 1949 to 1.808 million tons in 1983, ranking first in the world. However, production technology is still relatively backward, most of which are small open furnaces with high energy consumption and serious pollution. In order to reduce energy consumption, modern calcium carbide production mostly uses closed large-scale electric furnaces to reduce heat loss and facilitate the recycling of carbon monoxide.