Study on the processing technology to clean Lao Cai's yellow phosphorus slag for building materials

Abstract

Slag is produced in large quantities during the manufacturing of yellow phosphorus in the Tang Loong Industrial Zone (Lao Cai province, Vietnam). It is required to clean them before using them as building materials. The research findings on cleaning yellow phosphorus slag in water with slaked lime or quicklime as aiding agents are presented in this article. According to experimental findings, the typical water consumption is between 4 and 6 m3 per ton of slag, or 160 g of 20% Ca(OH)2 or 25 g of CaO per 300 L of water. It is simple to reuse the water after rinsing the slag. The processed yellow phosphorus slag's elemental composition data reveal that Ca(SiO2)O, which has a pseudo‐wollastonite structure, is the product's primary constituent. Although P and F are still present, they are mainly in the stable glass phase of Ca(SiO2)O, and there are not many impurities. The treated yellow phosphorus slag can be used in large quantities for building materials due to its safe radioactivity index (I) < 1.