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Use of online electrical conductivity meter to monitor cold decomposition of carnallite

 

WANG Xiao-bo, HOU Yuan-sheng, LI Hui-lin

 

(National Engineering Research Center for Integrated Utilization of Salt Lake Resource, Qinghai Salt Lake Industry Co., Ltd., Golmud 816000, China)

 

Abstract: Online control of the ratio of carnallite to water is a key to  achieve a fully  continuous and automatic potash production. By monitoring carnallite cold decomposition process using online conductivity meter,  the relationship between the conductivity and the control parameters was analyzed  based on the data collected online. The results show that the conductivity regularly varies with a general trend of decrease  after an initial increase when the ratio of mineral to water is adjusted. There are certain rules satisfying cubic polynomial regression equation. When the ratio of mineral to water is larger than 0.6, with the amount of carnallite increased by 10%, the conductivity decreases by 0.28%-0.45% accordingly and the relative deviation is less than 0.5%. The value of electrical conductivity has stabilized when the density of liquid increased to 1.27 g/cm3, namely, the solution reaches saturation. It has proved that the methods can be employed for online monitoring the ratio of carnallite to water during carnallite cold decomposition and the precise control has an important value for reference and application.

 

Key words: electrical conductivity meter; carnallite; cold decomposition

 

CLD number: TQ131  Document code: A

 

Article ID: 1674-8042(2015)02-0185-05  doi: 10.3969/j.issn.1674-8042.2015.02.013

 

References

 


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应用在线电导率仪监测光卤石冷分解过程

 

王晓波, 侯元昇, 李辉林

 

(国家盐湖资源综合利用工程技术研究中心, 青海盐湖工业股份有限公司, 青海 格尔木 816000)

 

摘要:光卤石冷分解过程中矿水量比例在线控制是实现钾肥连续化、自动化生产的关键。利用在线电导率仪监测了光卤石加水分解的过程, 根据获得的在线监测电导率数据, 分析了光卤石冷分解过程中电导率的变化和工艺控制参数间的关系。结果表明, 体系的电导率值随着矿水比的调整有规律地变化, 呈现出先增后减的总体变化趋势, 且测量值相对偏差小于0.5%。当矿水比大于0.6时, 光卤石质量每增加10%, 电导率相应降低0.28%~0.45%, 两者间满足3次多项式回归方程; 当液相密度增大到约1.27 g/cm3时, 体系达到饱和, 电导率值保持恒定不变。实践证明, 本文所述方法可应用于光卤石冷分解过程矿水量的在线监测, 对钾肥生产中光卤石冷分解工艺的精确控制具有重要的参考和应用价值。

 

关键词:电导率仪; 光卤石; 冷分解

 

引用格式:WANG Xiao-bo, HOU Yuan-sheng, LI Hui-lin . Use of online electrical conductivity meter to monitor cold decomposition of carnallite. Journal of Measurement Science and Instrumentation, 2015, 6(2): 185-189. [doi: 10.3969/j.issn.1674-8042.2015.02.013]

 


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