Thermal and Kinetic Analysis of the Process of Thermochemical Decomposition of Phosphogypsum with CO and Additives
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- 作者：Liping Ma ; Yalei Du ; Xuekui Niu ; Shaocong Zheng ; Wei Zhang
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2012
- 出版时间：May 16, 2012
- 年：2012
- 卷：51
- 期：19
- 页码：6680-6685
- 全文大小：338K
- 年卷期：v.51,no.19(May 16, 2012)
- ISSN：1520-5045
文摘
Phosphogypsum (PG) is a waste byproduct from the processing of phosphate rock by the 鈥樷€榳et acid method鈥欌€?of fertilizer production. One of the main methods for reusing PG is to decompose and recycle Ca and sulfur contained in it. However, the decomposition reaction process is very complex because of its complicated contents, and very high temperature is needed for the reaction. In this paper, to decrease the reaction temperature, CO as a main reducer and some additives were added in the decomposition process. Results show that the decomposition temperature will decrease from 1000 to 809 掳C with pure CO. When CaCl2 is used as an additive, the decomposition temperature can decrease to 790 掳C, and at the same time the reaction rate will be increased, the main product being CaS at this condition. The thermal and kinetic action of this process has also been discussed.