摘要
采用间歇反应器，在反应温度６０８０℃，磷酸浓度２０４０％Ｐ２Ｏ５，磷矿粒径０．１３８０．７ｍｍ，搅拌速度５００转／分的条件下，研究了磷酸分解上蒜磷矿的酸解反应动力学。研究表明，在上述条件下，该过程的速率控制步骤为氢离子通过Ｃａ（Ｈ２ＰＯ４）２的固态膜向反应界面的扩散。并建立了酸解过程的动力学模型，该模型在α＝０．０５上显著。表观活化能Ｅａ＝１０．０８ｋＪ·ｍｏｌ－１。
The experiments were carried out in a batch reactor. The reaction temperature was varied from 60 to 80℃, the initial phosphoric acid concentration 20 to 40 wt%P 2O 5, the initial mean particle size 0.138 to 0.7 mm, and the stirrer speed was 500 rpm. Under such conditions, the acidulation process of Shangsuan phosphate ore in phosphoric acid was investigated. The results showed that the rate determining step of the digestion process was the diffusion of hydrogen ions away from the bulk of the solution through the coating layer of Ca(H 2PO 4) 2 into the reaction surface. By applying the unreacted shrinking core model, a rate equation for the digestion process was fitted to experimental results as follows:1-3(1-x B) 2/3 +2(1-x B)=144.2 exp (-1.008×10 4RT)C 2.075 A0 R -0.1799 s exp (-1τ)\ \ The apparent activation energy E a was 10.08 kJ·mol -1
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
1998年第3期265-270,共6页
Journal of Chemical Engineering of Chinese Universities
关键词
磷酸
酸解反应
缩芯模型
动力学
磷矿
Phosphoric acid, Acidulation reaction, Unreacted shrinking core model
