論文
リン化合物の還元ガス化の初期検討
2022 年 108 巻 10 号 p. 721-727
詳細
2022 年 108 巻 10 号 p. 721-727
We investigated the reductive gasification of phosphorus compounds. As the first step, the partial P2 gas pressure (PP2) was calculated by using the data of FactSage7.2 for reductive gasification of Ca3(PO4)2, FePO4, P4O10. It was suggested that the reductive gasification of P4O10 was easiest. Moreover, CO reduction of P4O10 was more effective under 830°C and H2 reduction of P4O10 was more effective over 830°C. The weight change of phosphorus compound tablets were measured by using thermal balance furnace under 900°C in N2 or CO-N2 gas atmosphere. The gasification and reduction of Ca3(PO4)2 and Ca5(PO4)3OH tablets were not confirmed. On the other hand, the weight of red phosphorus tablets decreased from 400°C in N2 gas atmosphere. The gasification occurred. The weight of FePO4 tablets slightly decreased from 700°C in CO-N2 gas atmosphere. The gasification or reduction was suggested. The reduction of phosphorus compound in iron oxide tablets was carried out at 700°C, 900°C, 1000°C for 1 h in H2-CO2-N2 gas atmosphere. The removal ratio (Rp) was estimated by measuring concentration of Fe and P before and after reduction. The Rp of red phosphorus compound tablets, Ca5(PO4)3OH, Ca3(PO4)2 was 57%, 9%, 0%, respectively. In the red phosphorus tablets, P might be gasified.
