Yellow phosphorus production exhaust gas

Phosphine is present in the exhaust gases generated during yellow phosphorus production because it is produced when phosphate rock reacts with coal or coke at high temperatures. The phosphorus in phosphate rock reacts with coal or coke to form phosphides; the main reaction is the reduction of phosphates by coal or coke at high temperatures to produce phosphides. Phosphides include phosphine (PH3) and some other impurities. The chemical equation for this reaction can be simplified as follows: 2Ca3(PO4)2 + 6C + 10SiO2 → 6CaSiO3 + P4 + 6CO + 6H2. Inside the furnace, phosphine, due to its low boiling point, is expelled along with the exhaust gases. The hydrogen phosphide content in exhaust gases varies depending on the production process and equipment used. Phosphine is a highly toxic and flammable gas that poses hazards to both humans and the environment. When producing yellow phosphorus, a range of measures are often taken to control the emission of phosphine in the exhaust gases, such as through combustion or adsorption, to ensure the safety of the production process and environmental protection. .