变频刚柔搅拌反应器强化锰矿浸出及除铁过程

doi:10.16085/j.issn.1000-6613.2021-0001

化工进展 ›› 2021, Vol. 40 ›› Issue (6): 3083-3090.DOI: 10.16085/j.issn.1000-6613.2021-0001

变频刚柔搅拌反应器强化锰矿浸出及除铁过程

陈奇志¹^,²(), 周毅林³, 刘作华³, 陈南雄⁴, 杨勇⁴, 魏红军³, 童张法¹()

^1.广西大学化学化工学院，广西南宁 530004
^2.广西汇元锰业有限责任公司，广西来宾 546138
^3.重庆大学化学化工学院，重庆 400044
^4.中信大锰矿业有限责任公司，广西南宁 530029

收稿日期:2021-01-02 修回日期:2021-01-29 出版日期:2021-06-06 发布日期:2021-06-22
通讯作者: 童张法
作者简介:陈奇志（1973—），男，博士研究生，研究方向为化工新材料和化工冶金。E-mail：chenqizhi@citicdameng.com。
基金资助:
广西科技重大专项(桂科AA19182015);重庆市技术创新与应用发展专项面上项目(cstc2020jscx-msxmX0163)

Manganese ore leaching and iron removal intensified by variable frequency rigid-flexible stirred reactor

CHEN Qizhi¹^,²(), ZHOU Yilin³, LIU Zuohua³, CHEN Nanxiong⁴, YANG Yong⁴, WEI Hongjun³, TONG Zhangfa¹()

^1.School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China
^2.Guangxi Huiyuan Manganese Industry Co. ，Ltd. ，Laibin 546138，Guangxi，China
^3.School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
^4.CITIC Dameng Mining Industries Limited, Nanning 530029, Guangxi, China

Received:2021-01-02 Revised:2021-01-29 Online:2021-06-06 Published:2021-06-22
Contact: TONG Zhangfa

摘要/Abstract

摘要：

传统锰矿浸出过程采用刚性搅拌反应器，存在矿粉悬浮效果差、锰矿利用率低、浸出液中铁含量较高的问题。本文采用变频刚柔搅拌反应器强化锰矿的浸出过程，实验对比分析了不同桨叶类型、搅拌桨操作方式和变频间隔时间对锰矿浸出效果、搅拌功耗的影响，同时分析了变频刚柔桨耦合空气射流在除铁过程的效果。结果表明，变频刚柔桨通过柔性钢丝绳对流体的扰动作用以及变频操作对稳定流场的更新作用，提高浸出液中Mn²⁺含量；同时，由于体系变频操作的频率变化，降低了搅拌功耗。相同功耗下，刚柔组合桨体系浸出液中Mn²⁺含量相对于刚性桨体系提高了10.8%；相同转速下，刚柔组合桨体系在浸出过程的功率消耗相对于刚性桨体系提升了25.4%。变频间隔时间为30min时，变频刚柔桨体系浸出液中Mn²⁺含量相对于刚柔组合桨体系降低了2.17%，但相应搅拌功耗降低了28%。调节体系pH后，采用变频刚柔桨耦合偏心空气射流操作，可有效降低浸出液中Fe²⁺含量。在通气60min后，浸出液中Fe²⁺浓度已至较低水平，低于0.15mg/L。

关键词: 刚柔组合桨, 变频操作, 锰矿浸出, 空气射流, 除铁

Abstract:

Traditional rigid stirring reactor used in manganese ore leaching process has poor suspending effect of mineral powder, low manganese ore utilization and high iron content in leaching solution. The effects of impeller type, operating mode and frequency conversion interval on manganese ore leaching and power consumption were investigated experimentally, and the effect of variable frequency rigid-flexible impeller coupled with air jet in iron removal process was analyzed. The results showed that the flexible wire rope could disturb the fluid and the variable frequency operation could update the stable flow field, which increased the content of Mn²⁺ in the leaching solution. Meanwhile, due to the frequency change of the system frequency conversion operation, the power consumption was reduced. Mn²⁺ content in rigid-flexible stirred reactor increased by 10.8% than the regular stirred reactor in same power consumption. Power consumption in rigid-flexible stirred reactor increased by 25.4% than the regular stirred reactor in same stirring speed. When the frequency conversion interval was 30min, the Mn²⁺ content in variable frequency rigid-flexible stirred reactor decreased by 2.17% than the rigid-flexible stirred reactor. While the power consumption decreased by 28%. After adjusted the pH of the system, variable frequency rigid-flexible impeller coupling eccentric air jet could effectively reduce the Fe²⁺ content in the leaching solution. After 60min of aeration, the concentration of Fe²⁺ in the leached solution reached a low level, less than 0.15mg/L.

Key words: rigid-flexible impeller, variable frequency operation, manganese ore leaching, air jet, iron removal

中图分类号:

TQ027.2

陈奇志, 周毅林, 刘作华, 陈南雄, 杨勇, 魏红军, 童张法. 变频刚柔搅拌反应器强化锰矿浸出及除铁过程[J]. 化工进展, 2021, 40(6): 3083-3090.

CHEN Qizhi, ZHOU Yilin, LIU Zuohua, CHEN Nanxiong, YANG Yong, WEI Hongjun, TONG Zhangfa. Manganese ore leaching and iron removal intensified by variable frequency rigid-flexible stirred reactor[J]. Chemical Industry and Engineering Progress, 2021, 40(6): 3083-3090.

图/表 11

图1 实验装置及变频装置

图2 变频间隔时间的设置

图3 实验变频控制流程图

图4 不同桨叶类型下体系功耗随搅拌时间变化

图5 不同搅拌桨操作方式下体系功耗随搅拌时间变化

图6 不同变频间隔时间下体系功耗随搅拌时间变化

图7 不同桨叶类型下浸出液中Mn2+含量随搅拌时间变化

图8 不同搅拌桨操作方式下浸出液中Mn2+含量随搅拌时间变化

图9 不同变频间隔时间下浸出液中Mn2+含量随搅拌时间变化

图10 通气时间对浸出液中Fe2+浓度的影响

图11 不同通气状态下通气时间对浸出液中Fe2+浓度的影响

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变频刚柔搅拌反应器强化锰矿浸出及除铁过程

Manganese ore leaching and iron removal intensified by variable frequency rigid-flexible stirred reactor

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