青海盐湖纳滤膜性能劣化原因分析

doi:10.19964/j.issn.1006-4990.2024-0402

Abstract

Abstract:

To investigate the reasons for degradation of separation performance of lithium extraction nanofiltration membranes in salt lakes，two-stage nanofiltration membranes retired from lithium extraction in Qinghai Yiliping Salt Lake were autopsied and analyzed by SEM，FT-IR，ICP，XRD，XPS to understand the morphologies and compositions of the membrane fouling layer.The results showed that both membranes of stage one and stage two were primarily suffered from organic and microbial pollution，with a mass fraction of 77% and 69% respectively.The organic pollution from stage one to stage two was gradually weakened，while the inorganic pollution was aggravated.The organic foulants were mainly lipids，proteins，nucleic acids，and polysaccharides，which originated from extracellular polymers（EPS） secreted by microorganisms and microbial metabolites.Mg，Ca，Al，Fe，Si，K，Na were the predominant inorganic elements，which were clay minerals deposition from salt lake sediments such as illite，chlorite，quartz，and albite.In addition，the retired membrane were subjected to chlorination during service.The accumulation of the above pollutants and chlorination were principal factors causing performance deterioration of the retired nanofiltration membranes.This research provided a basis for the efficient operation optimization and effective control of membrane fouling in future application.

Key words: lithium extraction from salt lake, separation of magnesium and lithium, nanofitration membrane, membrane fouling, membrane degradation

CLC Number:

TS396.5

ZHANG Shengpeng, HUANG Minmin, TANG Faman, LIU Weiping. Degradation analysis of nanofiltration membrane performance for Qinghai Salt Lake[J]. Inorganic Chemicals Industry, 2025, 57(10): 90-97.

Figures/Tables 10

Table 1

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pH		浊度/NTU		悬浮物/（mg·L^-1）		全盐量/（mg·L^-1）		电导率/（μS·cm^-1）		总碱度/（mg·L^-1）		COD_cr/（mg·L^-1）
8.2		<0.3		18		5.9×10⁴		6.5×10⁴		893		3×10³
物质质量浓度/（mg·L^-1）
钾	钠	钙	镁		锂	硼	铁	铝	二氧化硅	氯离子	硫酸根		余氯
44	278	37	6.9×10³		305	270	0.5	3.5×10^-2	0.2	1.9×10⁴	1.3×10³		0.07

膜位置	原子数分数/%
膜位置	C 1s	N 1s	O 1s	Cl 2p
一段	69.9	8.8	20	0.54
二段	64.7	11.2	23	0.45

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Degradation analysis of nanofiltration membrane performance for Qinghai Salt Lake

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