电导率法快捷高效测定生石灰活性度

doi:10.19964/j.issn.1006-4990.2022-0674

Abstract

Abstract:

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

CLC Number:

TQ132.32

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.

Figures/Tables 11

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搅拌时间/min	R²	搅拌时间/min	R²
6	0.977 7	15	0.983 3
9	0.982 8	18	0.982 3
12	0.984 0

溶液温度/℃	R²	溶液温度/℃	R²
20.0	0.981 5	27.5	0.983 0
22.5	0.982 8	30	0.984 0
25.0	0.985 4

活性度 A_exp./mL	电导率σ/（mS·cm^-1）							式（1）计算值 A_cal_. /mL	绝对偏差/mL	相对偏差/%
活性度 A_exp./mL	1	2	3	4	5	6	平均值	式（1）计算值 A_cal_. /mL	绝对偏差/mL	相对偏差/%
219.0	3.23	3.34	3.28	3.27	3.33	3.30	3.292	218.8	0.2	0.091 3
327.9	4.64	4.65	4.67	4.69	4.47	4.70	4.637	326.7	1.2	0.366 0
403.6	5.61	5.71	5.52	5.50	5.49	5.65	5.580	402.4	1.2	0.297 5

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Fast and efficient determination of quicklime activity by conductivity method

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