湿法磷酸固-液体系混沌混合与浸出强化行为

doi:10.11949/j.issn.0438-1157.20181253

化工学报 ›› 2019, Vol. 70 ›› Issue (5): 1742-1749.DOI: 10.11949/j.issn.0438-1157.20181253

湿法磷酸固-液体系混沌混合与浸出强化行为

李兵^1,²(),杨义¹,刘作华¹(),陶长元¹,谷德银¹,许传林¹,王运东³

1. 重庆大学化学化工学院，重庆 401331
2. 中化重庆涪陵化工有限公司，重庆 408100
3. 清华大学化学工程系，北京 100084

收稿日期:2018-10-22 修回日期:2019-01-31 出版日期:2019-05-05 发布日期:2019-05-05
通讯作者: 刘作华
作者简介:<named-content content-type="corresp-name">李兵</named-content>(1975—)，男，博士研究生，正高级工程师，<email>1127753494@qq.com</email>|刘作华(1973—)，男，博士，教授，<email>liuzuohua@cqu.edu.cn</email>
基金资助:
国家重点研发计划项目(2017YFB0603105);国家自然科学基金项目(21576033, 21621636004);国家科技支撑计划项目(2015BAB17B01);中央高校基本科研业务费专项资金(106112017CDJQJ228808);重庆市科技创新领军人才支持计划项目(CSTCCXLJRC201703)

Solid-liquid chaotic mixing and leaching enhancement performance in phosphoric acid leaching process

Bing LI^1,²(),Yi YANG¹,Zuohua LIU¹(),Changyuan TAO¹,Deyin GU¹,Chuanlin XU¹,Yundong WANG³

1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
2. Sinochem Fuling Chongqing Chemical Industry Co., Ltd, Chongqing 408100, China
3. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2018-10-22 Revised:2019-01-31 Online:2019-05-05 Published:2019-05-05
Contact: Zuohua LIU

摘要/Abstract

摘要：

湿法磷酸浸出过程中，传统刚性搅拌桨的作用方式主要是剪切作用，容易形成对称性流场结构，降低搅拌效率。实验考察了桨叶类型、离底高度、搅拌速度、柔性钢丝绳长度、柔性钢丝直径对磷矿浸出率及最大Lyapunov指数(LLE)的影响。实验结果表明：刚柔组合桨通过刚-柔-流的耦合作用，改善流场的结构，提高了流体混沌混合效果。当搅拌转速225 r/min，浸出时间120 min，离底高度h=T/4，柔性钢丝绳直径d= 0.42r，柔性钢丝绳长度L=1.3T时，刚柔组合桨的最大Lyapunov指数达到0.09071，磷矿浸出率提高了10.8%。另外，在相同的功耗(P _v=9890 W/m³)条件下，刚柔组合桨使反应器内的悬浮均匀度和渣中磷含量分别降低了40.8%和17.67%，有效地改善了晶体的形貌，提高了磷石膏的过滤性能，强化了颗粒的混合与浸出。

关键词: 湿法磷酸, 刚柔组合桨, 两相流, 浸取, 结晶, 最大Lyapunov指数

Abstract:

In the process of wet-process phosphoric acid leaching, the mode of action of the traditional rigid stirring paddle is mainly shearing, and it is easy to form a symmetrical flow field structure and reduce the stirring efficiency. The effects of impeller type, impeller off-bottom clearance, stirring speed, length of flexible wire, diameter of flexible wire on leaching rate and largest Lyapunov exponent (LLE) were investigated experimentally. The results showed that rigid-flexible impeller changed structure of flow field and improved the fluid chaos mixing degree through coupling interaction of rigid-flexible-fluid. At leaching time 120 min, agitation speed 225 r/min, off-bottom clearance h=T/4, diameter of wire d=0.42r and length of wire L=1.3T, LLE of rigid-flexible impeller reached 0.9071 and leaching rate of phosphate rock increased by 10.8%. At the same power consumption (P _v=9860 W/m³), the suspension uniformity and the slag phosphorus content were reduced by 40.8% and 17.67% with the rigid-flexible impeller, respectively. In addition, the morphology of the crystal was improved when the rigid-flexible impeller was used. Meanwhile, the filtration performance of phosphogypsum was enhanced.

Key words: wet-process phosphoric acid, rigid-flexible impeller, two-phase flow, leaching, crystallization, largest Lyapunov exponent

中图分类号:

TQ 027.2

李兵, 杨义, 刘作华, 陶长元, 谷德银, 许传林, 王运东. 湿法磷酸固-液体系混沌混合与浸出强化行为[J]. 化工学报, 2019, 70(5): 1742-1749.

Bing LI, Yi YANG, Zuohua LIU, Changyuan TAO, Deyin GU, Chuanlin XU, Yundong WANG. Solid-liquid chaotic mixing and leaching enhancement performance in phosphoric acid leaching process[J]. CIESC Journal, 2019, 70(5): 1742-1749.

图/表 18

图1 实验装置

Fig.1 Experimental setup

图2 搅拌桨结构

Fig.2 Schematic diagram of impeller

图3 磷矿粉的XRD谱图

Fig.3 XRD pattern of phosphate

图4 桨叶类型对浸出率的影响

Fig.4 Effect of impeller type on leaching rate

图5 桨叶类型对LLE的影响

Fig.5 Effect of impeller type on LLE

图6 不同转速对浸出率的影响

Fig.6 Effect of different speed on leaching rate

图7 离底高度对浸出率的影响

Fig.7 Effect of impeller off-bottom clearance on leaching rate

图8 桨叶离底高度对LLE的影响

Fig.8 Effect of impeller off-bottom clearance on LLE

图9 柔性钢丝直径对浸出率的影响

Fig.9 Effect of diameter of flexible wire on leaching rate

图10 柔性钢丝直径对LLE的影响

Fig.10 Effect of diameter of flexible wire on LLE

图11 柔性钢丝长度对浸出率的影响

Fig.11 Effect of length of flexible wire on leaching rate

图12 柔性钢丝长度对LLE的影响

Fig.12 Effect of length of flexible wire on LLE

图13 桨叶类型对悬浮均匀度的影响

Fig.13 Effect of impeller type on suspension uniformity

图14 桨叶类型对功耗的影响

Fig.14 Effect of impeller type on power consumption

图15 桨叶类型对残余磷的影响

Fig.15 Effect of impeller type on residual phosphorus

图16 过滤效果(a)/渗透率(b)随时间的变化

Fig.16 Filtering effect(a)/permeability(b) change with time

图17 磷石膏的SEM图

Fig.17 SEM images of phosphogypsumr

图18 不同浸出渣的XRD谱图

Fig.18 XRD patterns comparison of slag

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湿法磷酸固-液体系混沌混合与浸出强化行为

Solid-liquid chaotic mixing and leaching enhancement performance in phosphoric acid leaching process

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