高硫高硬气田采出水提锂过程关键技术及应用

doi:10.19964/j.issn.1006-4990.2022-0608

Abstract

Abstract:

The produced water of gas field is not only a refractory wastewater with high salt，high sulfur，high hardness，petroleum and complex organic matter，but also a mineral resource with a variety of high value elements，among which lithium is the most concerned.The combination of effective pretreatment process and lithium adsorption method was applied.Lithium element was successfully extracted from the complex composition of the gas field produced water，and qualified industrial grade lithium carbonate products were prepared.At the same time，the treated effluent met the water quality requirements of reuse water.The experimental results showed that the removal rates of oil，suspended solids and sulfide could reach 90.4%，92.9% and 98.1%，respectively.After the high efficiency cyclone floatation and stripping tower desulfurization treatment.The recovery rate of lithium could reach 88.0% with efficient adsorption.The lithium rich liquid was purified by nanofiltration membrane and concentrated by reverse osmosis and electrodialysis membrane.The purity of the final lithium carbonate product could reach 99.8%，and the product was in line with GB/T 11075—2013“Lithium Carbonate” Li₂CO₃-1 standard.

Key words: gas field produced water, pretreatment, extracting lithium, recycling, resource recovery

CLC Number:

TQ131.11

LI Li,LI Yu,JIN Yan,QIU Jun,YANG Ying,ZHANG Yonghong,XIAO Fang,YU Jianguo. Key technology and application of lithium extraction from produced water in high sulfur and high hardness gas fields[J]. Inorganic Chemicals Industry, 2023, 55(1): 74-80.

Figures/Tables 13

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References 23

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名称	规格型号	数量
原水罐	容积：30 m³；材质：聚乙烯（PE）	2个
高效旋流分离装置	尺寸：3 m×2 m× 5 m；材质：碳钢（CS）+聚脲	1套
脱硫装置	尺寸：φ0.3 m×5 m；材质：聚丙烯（PP）	2套
化学软化沉淀装置	尺寸：3.5 m×2 m× 3 m；材质：CS+聚脲	1套
锂吸附塔	尺寸：φ0.3 m×5 m；材质：PP	2套
纳滤膜装置	尺寸：2.5 m×0.6 m× 1.5 m；材质：复合膜，碳钢架子	1套
超滤膜装置	尺寸：2 m×0.6 m× 1.5 m；材质：聚偏氟乙烯（PVDF）膜，碳钢架子	1套
反渗透膜装置	尺寸：2 m×0.6 m× 1.5 m；材质：复合膜，碳钢架子	1套
电渗析装置	尺寸：4 m×3 m× 2.5 m；材质：复合膜，碳钢架子	1套
结晶装置	尺寸：2 m×1.5 m× 2.5 m；材质：搪瓷斧，碳钢架子	1套
离心分离装置	尺寸：1 m×1 m×0.5 m；材质：SS316L	1套
加药装置	溶药罐体积：200 L，罐体材质：PE/PP；加药装置尺寸：4 m×0.5 m× 1.5 m；加药装置材质：碳钢架子	5台
控制系统	配套设计	1套

样品	pH	ρ（Li）/（mg?L^-1）	ρ（Na）/（mg?L^-1）	ρ（Ca）/（mg?L^-1）	ρ（Mg）/（mg?L^-1）	ρ（Ba）/（mg?L^-1）	ρ（Sr）/（mg?L^-1）	ρ（B）/（mg?L^-1）
气田水预处理产水	8.3	65.2	72 510.0	1 273.8	121.7	1 135.3	928.3	425.6
流出混合液成分	7.6	7.8	74 770	1 270.1	119.1	1 041.8	921.5	411.1

项目	w （Li₂CO₃）	w （Na⁺）	w （Ca²⁺）	w （Mg²⁺）	w （Cl^-）	w （SO₄^2-）
未水洗碳酸锂产品	98.6	0.28	0.076	0.015	0.397	ND
一次水洗碳酸锂产品	99.8	0.06	0.036	0.009	0.014	ND
GB/T 11075—2013 Li₂CO₃-0	≥99.2	≤0.08	≤0.025	≤0.015	≤0.010	≤0.20
GB/T 11075—2013 Li₂CO₃-1	≥99.0	≤0.15	≤0.040	—	≤0.020	≤0.35
GB/T 11075—2013 Li₂CO₃-2	≥98.5	≤0.20	≤0.070	—	≤0.030	≤0.50

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Key technology and application of lithium extraction from produced water in high sulfur and high hardness gas fields

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