Predicting Gaseous Pollution of Sintered Brick Preparation from Yellow Phosphorus Slag
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College of Resources and Environment, Yunnan Agricultural University, Kunming, China
College of Materials and Chemical Engineering, Chongqing University of Arts and Sciences, Chongqing, China
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, China
Submission date: 2018-01-06
Final revision date: 2018-04-01
Acceptance date: 2018-04-11
Online publication date: 2018-12-12
Publication date: 2019-02-18
Corresponding author
Hongpan Liu   

Chongqing University of Arts and Sciences, College of Materials and Chemical Engineering, Chongqing University of Arts and Sciences, Chongqing , 402160 Chongqing, China
Pol. J. Environ. Stud. 2019;28(3):1719-1725
To investigate secondary pollution issued during the preparation of sintered brick from waterquenched yellow phosphorus slag, the composition of slag was experimentally measured in this study. The thermal conversion process and gas phase products associated with S-, P-, F-, and As-containing species present in the heating system were theoretically calculated by means of thermochemical software FactSage 7.0 and databases. The results showed that F and As were released at 700ºC and the gaseous products contained AsF3. Also, large amounts of F remained in solid CaF2 and Ca10(PO4)6F2. At a calcination temperature of 900ºC, all As was transferred into gaseous AsF3 and S started to convert into gaseous SO2 and SO3. Other data suggested that the released amounts of SO2 and SO3 increased as calcination temperature rose. At calcination temperatures ranging from 100-1000ºC, all P existed as solid Ca10(PO4)6F2. These findings indicated that low calcination temperatures were beneficial for reducing released harmful gases during the production of sintered brick.
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