渤海莱州湾地下卤水纳滤过程的结垢趋势研究

doi:10.11962/1006-4990.2018-0522

Abstract

Abstract:

Facing the scaling problem in nanofiltration process of treating underground brine in Laizhou bay,the scaling tendency and effective factors of calcium carbonate and calcium sulfate of the brine were systematically studied by using saturation method in the nanofiltration process.Result showed that calcium carbonate was in a state of saturation,while the calcium sulfate was not in the brine at a room temperature.Consequently,calcium carbonate was more likely to precipitate when the brine was affected by external factors.Reducing the pH of the brine could effectively inhibit calcium carbonate scaling.Increasing the recovery rate of brine production gradually,the risk of calcium sulfate in the concentrated side of nanofiltartion system was increased.Therefore,it was necessary to select an appropriate recovery rate of brine production to reduce the scaling of calcium sulfate in the nanoflitration process.

Key words: brine, nanofiltration, scaling, calcium carbonate, calcium sulfate

CLC Number:

TQ132.32

Liu Jianlu,Liu Xia,Yue Maowen. Study on scaling tendency in nanofiltration process by treating underground brine in Laizhou bay,Bohai[J]. Inorganic Chemicals Industry, 2019, 51(8): 64-68.

Figures/Tables 8

References 17

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ρ （K⁺）	ρ （Na⁺）	ρ （Ca²⁺）	ρ （Mg²⁺）	ρ （Fe³⁺）	ρ （Fe²⁺）	ρ （NH₄⁺）	ρ （Cl^-）
1 049	34 245	1 147	5 686	0.24	0.05	0.01	66 853
ρ （SO₄^2-）	ρ （HCO₃^-）	ρ （F^-）	ρ （Br^-）	ρ （NO₂^-）	ρ （NO₃^-）	ρ （PO₄^3-）	ρ（可溶性SiO₂）
9 313	497	0.30	175	0.40	40.32	0.23	4.40

编号	项目	18 ℃		42 ℃
编号	项目	ρ（Ca²⁺）/ （g·L^-1）	ρ（SO₄^2-）/ （g·L^-1）	ρ（Ca²⁺）/ （g·L^-1）	ρ（SO₄^2-）/ （g·L^-1）
1^#	空白样	1.101	9.724	0.921	9.692
2^#	加入CaCO₃	0.925	9.712	0.911	9.670
3^#	加入CaCO₃	0.911	9.685	0.901	9.792
4^#	加入CaSO₄·2H₂O	1.251	10.192	1.402	10.396
5^#	加入CaSO₄·2H₂O	1.251	10.072	1.302	10.272
6^#	加入石膏粉	1.225	9.939	1.350	10.340
7^#	加入石膏粉	1.267	9.863	1.350	10.372

pH	温度/ ℃	ρ（Ca²⁺）/ （g·L^-1）	说明
7.19	室温	0.951	室温放置,未见析出物
7.10	42	0.901	未酸化,底部析出沉淀,经分析为CaCO₃
6.70	42	0.948	酸化,pH降低,未见析出物
6.17	42	0.953	酸化,pH降低,未见析出物
5.85	42	0.948	酸化,pH降低,未见析出物
5.42	42	0.945	酸化,pH降低,未见析出物

回收率/ %	浓缩倍数	卤水结垢情况	回收率/ %	浓缩倍数	卤水结垢情况
0	—	—	60	2.5	出现少量浑浊
33	1.5	无变化	67	3.0	浑浊
50	2.0	无变化

元素	质量分数/%	原子百分数/%	元素	质量分数/%	原子百分数/%
C K	0.18	0.33	Ca K	28.54	15.83
O K	49.50	68.71	S K	20.60	14.22
Na K	0.38	0.36	Cl K	0.59	0.36
Mg K	0.21	0.19

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on scaling tendency in nanofiltration process by treating underground brine in Laizhou bay,Bohai

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编号	项目	18 ℃		42 ℃
编号	项目	ρ（Ca²⁺）/ （g·L^-1）	ρ（SO₄^2-）/ （g·L^-1）	ρ（Ca²⁺）/ （g·L^-1）	ρ（SO₄^2-）/ （g·L^-1）
8^#	空白样	1.452	12.718	1.452	12.528
9^#	加入CaCO₃	1.477	12.656	1.577	12.484
10^#	加入CaCO₃	1.452	12.699	1.602	12.432
11^#	加入CaSO₄·2H₂O	1.051	11.578	1.001	11.517
12^#	加入CaSO₄·2H₂O	1.001	11.458	1.001	11.498