Regarding the accident involving phosphide sludge in the production of yellow phosphorus by electric furnace method
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A yellow phosphorus production facility that primarily uses the electric furnace method experienced an issue during the removal of iron slag: ferrophosphorus ended up in the water quenching tank, resulting in a large amount of steam being released. But the steam is highly yellowish; what could be the reason for this? What is the specific principle behind it!
The formation of yellow vapor is mainly due to the reaction of ferrophosphorus with water to produce phosphine (PH3) and other phosphorus compounds. Phosphine is a colorless and highly flammable gas, but it can be partially oxidized in air to form white or yellow phosphorescence or phosphoric acid. Therefore, when ferrophosphorus comes into contact with water, the hydrogen phosphide produced forms yellow vapor when exposed to air. At the same time, this reaction process can release a large amount of heat, causing steam to escape rapidly. This phenomenon not only poses a potential explosion risk but may also cause harm to the environment and human health. .
Ferrophosphorus is a by-product of the yellow phosphorus production process and contains phosphorus. When ferrophosphorus enters the water quenching tank, the phosphorus element may react with water to produce gases such as phosphine. As these gases escape, they may appear yellow due to the presence of phosphorus-containing compounds. During the production of yellow phosphorus, the high temperature in the electric furnace may cause some of the yellow phosphorus to exist in vapor form. When these vapors come into contact with the water in the water quenching tank, they may condense into tiny yellow phosphorus particles due to the temperature drop; these particles escape along with the steam, causing the steam to appear yellow. Impurities in the raw materials may undergo chemical reactions at high temperatures, producing colored gases. These gases can also cause the steam to appear yellow as they escape with it. Optimize the production process: Improve the process for removing iron slag to prevent ferrophosphorus from entering the water quenching tank directly. Enhance raw material screening and pretreatment to reduce impurity content. Strengthen safety measures: Seal the water quenching tank to reduce steam leakage. Strengthen training on safety awareness among employees to ensure they understand and comply with safety procedures. Environmental protection treatment: The escaped steam is collected and treated to prevent environmental pollution. Regularly maintain and inspect production equipment to ensure its proper operation and reduce the occurrence of failures.