Inorganic Chemicals Industry >
Fast and efficient determination of quicklime activity by conductivity method
Received date: 2022-11-14
Online published: 2023-09-19
In order to overcome the shortcomings of the methods for determining the activity of quicklime by the titration method of hydrochloric acid and the temperature rise rate method，such as the large amount of reagents，restricted conditions and complicated operation，a method for the determination of the conductivity of quicklime activity with less reagents，simple operation and suitable for different activity levels was proposed.The effects of stirring time，stirring speed，solution temperature and the ratio of quicklime to water on the correspondence between the activity of quicklime and the conductivity of the solution were investigated，and the most suitable conditions for the linear relationship between the activity of quicklime and the conductivity were investigated.The results showed that the optimum conditions for the determination of the lime activity were：stirring time of 12 min，solution temperature of 25 ℃，stirring speed of 200 r/min，and the dosage of lime and water of 1 g，1 000 mL.The linear relationship between the lime activity and the solution conductivity was A=（σ-0.565 7）/0.012 46，and the fitted linear correlation coefficient was R2=0.993 1.Compared with the hydrochloric acid titration method specified in the current standard（YB/T 105—2014），this method had the advantages of saving time，drugs，energy consumption and easy operation.The maximum relative deviation between this method and hydrochloric acid titration method was 0.366%，the precision was completely reliable and could be used for industrial promotion.
Key words： lime; calcium oxide; conductivity; activity
CHEN Qi , LIAO Dankui , ZHANG Qingnian , YAN Jinsheng , HUANG Yu , CHEN Xiaopeng , TONG Zhangfa . Fast and efficient determination of quicklime activity by conductivity method[J]. Inorganic Chemicals Industry, 2023 , 55(9) : 114 -120 . DOI: 10.19964/j.issn.1006-4990.2022-0674
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