柠檬酸三钠对低钠光卤石分解制备氯化钾晶体粒度影响研究

doi:10.19964/j.issn.1006-4990.2021-0396

Abstract

Abstract:

Aiming at the problems of small average particle size of potassium chloride crystal prepared by carnallite decomposition,resulting in large loss of filtration and washing and high energy consumption in drying,the effect of adding concentration of trisodium citrate,concentration of carnallite solution,stirring rate,residence time,volume and rate of carnallite solution on the particle size of potassium chloride crystal was investigated with trisodium citrate as nucleation inhibitor.Based on the single factor experiment,the Box-Behnken response surface optimization design method of three factors and three levels was used to study.The results showed that the average particle size of potassium chloride crystal was 595.892 μm under the conditions of adding 0.007 mol/L trisodium citrate,adding 0.759 g/mL carnallite solution,stirring rate of 372.52 r/min,residence time of 40 min,adding volume of 100 mL and adding rate of 2 mL/min,which was 1.69 times of the average particle size （351.607 μm） of the obtained potassium chloride product when trisodium citrate was not added and other experimental conditions remained unchanged.And the purity of potassium chloride product was 95.82%,which met the requirements of potassium chloride product quality standard of“Industrial potassium chloride” GB/T 7118—2008.The experimental results provided a reference for improving the particle size of potassium chloride products.

Key words: potassium chloride, trisodium citrate, response surface analysis, low sodium carnallite

CLC Number:

TQ131.13

DU Jingling,DONG Weibing,QIE Zhijia,MA Shengkui,TIAN Hongbin,WANG Gang. Study on effect of trisodium citrate on particle size of potassium chloride crystal prepared by decomposition of low sodium carnallite[J]. Inorganic Chemicals Industry, 2022, 54(4): 112-118.

Figures/Tables 16

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References 28

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水平	A 柠檬酸三钠添加浓度/（mol·L^-1）	B添加液质量浓度/ （g·mL^-1）	C 搅拌速率/ （r·min^-1）
-1	0.004	0.725	300
0	0.020	0.750	400
1	0.036	0.775	500

方差来源	平方和	自由度	均方	F值	P值	显著性
回归模型	2.31×10⁵	9	25 709.94	386.99	< 0.000 1	**
A	1 512.5	1	1 512.5	22.77	0.002	**
B	14 706.13	1	14 706.13	221.36	< 0.000 1	**
C	47 278.13	1	47 278.13	711.64	< 0.000 1	**
AB	110.25	1	110.25	1.66	0.238 6
AC	2 756.25	1	2 756.25	41.49	0.000 4	**
BC	1 156	1	1 156	17.4	0.004 2	**
A²	13 016.25	1	13 016.25	195.92	< 0.000 1	**
B²	33 991.67	1	33 991.67	511.65	< 0.000 1	**
C²	1.03×10⁵	1	1.03×10⁵	1 549.28	<0.000 1	**
残差	465.05	7	66.44
失拟项	354.25	3	118.08	4.26	0.097 6
纯误差	110.8	4	27.7
总和	2.32×10⁵	16
R²	0.998
R²_Adj	0.995 4

柠檬酸三钠添加浓度/（mol·L^-1）	ρ（K）/ （mg·L^-1）	ρ（Mg）/ （mg·L^-1）	ρ（Na）/ （mg·L^-1）	ρ（Ca）/ （mg·L^-1）
0.000	19.996 6	0.301 2	0.214 6	0.009 4
0.007	20.088 8	0.297 6	0.216 3	0.007 2

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on effect of trisodium citrate on particle size of potassium chloride crystal prepared by decomposition of low sodium carnallite

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实验号	A	B	C	Y/μm
1	-1	0	1	305
2	0	1	1	277
3	-1	-1	0	376
4	0	1	-1	476
5	0	-1	-1	355
6	1	1	0	481
7	0	0	0	578
8	1	0	1	287
9	0	0	0	580
10	0	-1	1	224
11	1	0	-1	482
12	-1	1	0	471
13	0	0	0	585
14	1	-1	0	407
15	-1	0	-1	395
16	0	0	0	571
17	0	0	0	582

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实验号	A	B	C	Y/μm
1	-1	0	1	305
2	0	1	1	277
3	-1	-1	0	376
4	0	1	-1	476
5	0	-1	-1	355
6	1	1	0	481
7	0	0	0	578
8	1	0	1	287
9	0	0	0	580
10	0	-1	1	224
11	1	0	-1	482
12	-1	1	0	471
13	0	0	0	585
14	1	-1	0	407
15	-1	0	-1	395
16	0	0	0	571
17	0	0	0	582

实验号	A	B	C	Y/μm
1	-1	0	1	305
2	0	1	1	277
3	-1	-1	0	376
4	0	1	-1	476
5	0	-1	-1	355
6	1	1	0	481
7	0	0	0	578
8	1	0	1	287
9	0	0	0	580
10	0	-1	1	224
11	1	0	-1	482
12	-1	1	0	471
13	0	0	0	585
14	1	-1	0	407
15	-1	0	-1	395
16	0	0	0	571
17	0	0	0	582