自贡地下卤水制备富锶功能盐工艺研究

doi:10.19964/j.issn.1006-4990.2023-0235

Abstract

Abstract:

Underground brine in Zigong contains rich sodium，magnesium，lithium bromide，strontium，etc.It can be used to produce raw salt，magnesium salt，bromine and other industrial products，which is an important liquid mineral resource for the alkali industry and salt industry.In response to the characteristics of rich strontium in underground brine in Zigong and the current status of salt production technology，strontium rich salt was developed.By optimizing oxalic acid as brine purifying agents，calcium and magnesium were removed from brine，and more strontium was retained.The optimized brine purification process was as follows：adding 5.2 mL of oxalic acid with concentration of 0.7 mol/L at a constant rate of 5 mL/min to 100 mL of brine at 45 ℃，adjusting the pH to 8.0，stirring for 30 min，adding 0.3 mL of polyacrylamide with mass concentration of 2 g/L and molecular weight of 8 million，allowing the final solution to stand for 1 h.The strontium content in the table salt（100 g dry basis） prepared by high-temperature evaporation of purified brine obtained by optimizing the process was 37.5 mg，which was 20 times of the strontium content in the currently available table salt.The strontium salts and other index requirements complied with the national standard（GB 2721—2015）.The new process realized the comprehensive utilization of strontium in Zigong brine，and also provided citizens with the choice of strontium rich functional salts.

Key words: underground brine, purification, strontium, table salt

CLC Number:

TQ132.33

SU Xin, LAI Dongmei, ZHOU Yuan, ZHU Xiaping. Study on preparation process of strontium rich functional salt from Zigong underground brine[J]. Inorganic Chemicals Industry, 2024, 56(3): 45-50.

Figures/Tables 13

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References 16

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项目	除钙率/%	锶质量浓度/（mg·L^-1）
原卤	—	195.50
草酸	98.53	77.50
草酸钠	98.49	77.47
Na₂CO₃	97.68	61.50
NaOH	17.07	175.95

APAM相对分子质量	沉淀物高度/cm
APAM相对分子质量	0 min	5 min	15 min	30 min	60 min
300万	19.00 Ⅳ	1.80 Ⅲ	2.00 Ⅱ	2.00 Ⅱ	1.90 Ⅰ
400万	18.00 Ⅳ	4.30 Ⅱ	3.10 Ⅱ	2.70 Ⅱ	3.10 Ⅰ
600万	19.00 Ⅳ	2.50 Ⅱ	1.90 Ⅱ	1.80 Ⅱ	2.10 Ⅰ
800万	18.00 Ⅳ	1.10 Ⅱ	1.10 Ⅱ	1.20 Ⅱ	1.10 Ⅰ
1 200万	19.00 Ⅳ	1.40 Ⅱ	1.30 Ⅱ	1.30 Ⅰ	1.20 Ⅰ

类别	除钙率/%	锶质量浓度/（mg·L^-1）
原卤	—	195.50
APAM 300万	97.42	70.00
APAM 400万	98.24	85.63
APAM 600万	98.25	88.53
APAM 800万	98.67	90.47
APAM 1 200万	98.19	76.25

样品名称	锶质量浓度/（mg·g^-1）
最优工艺处理组	0.375
驰宇加碘盐	0.019
淳熙加碘盐	0.018

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National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation process of strontium rich functional salt from Zigong underground brine

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