开采背景下柴达木盆地东台吉乃尔盐湖氯化锂矿床变化特征

doi:10.11962/1006-4990.2020-0251

Abstract

Abstract:

The East Taijnar Salt Lake is an important LiCl deposit in brine of Qaidam Basin,China.To study on the variation characteristics of this ore deposit before and after mining is of great significance for the rational and sustainable utilization of lithium resources in brine.Base on existing borehole data（before mining） and the measured borehole data（after mining）,the hydrochemistry of the LiCl deposit,the structure of the ore body and the water-salt equilibrium characteristics of the mining area were compared and researched.The results indicated that the hydrochemical characteristics of the LiCl deposit changed obviously after mining,the phreatic brine was further concentrated,and the evolution generally attained the stage of potassium mixed salt（blodite） precipitation,and the grade of LiCl of the deposit was higher than that before mining.The evolution of the confined brine was changed to relative desalination,which lain in the transition zone between picromerite and blodite in the K⁺,Na⁺/Mg²⁺/Cl^-,SO₄^2--H₂O phase diagram at 25 ℃,and the LiCl grade of the deposit was lower than that before mining. After mining,the thickness and area of the phreatic brine deposit decreased greatly,and a discontinuous north-south ore bed was formed,which changed the original forms of continuous strip distribution before mining.There was no significant change in the confined brine ore body after mining.The original water-salt balance changed after mining,water quantity change ΔQ and salt quantity change ΔQ_c were -2.83×10⁸ m³/a and -3.331×10⁷ t/a,respectively,indicating that salt quantity was positive equilibrium,and salt minerals were continue to precipitate.The study could provide the basis for rational exploitation and scientific protection of mining area.

Key words: LiCl deposit, hydrochemical characteristics, hydrogeology, water-salt balance, East Taijnar salt lake

CLC Number:

TQ131.11

Han Guang,Han Jibin,Liu Jiubo,Hou Xianhua,Chen Jinniu,Cao Yizhang. Variation characteristics of LiCl deposit under condition of mining in East Taijnar Salt Lake,Qaidam Basin[J]. Inorganic Chemicals Industry, 2020, 52(12): 17-22.

Figures/Tables 4

References 20

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开采前后	样品（数量）	ρ（Ca²⁺）/ （mg·L^-1）	ρ（Mg²⁺）/ （g·L^-1）	ρ（Na⁺）/ （g·L^-1）	ρ（K⁺）/ （g·L^-1）	ρ（Cl^-）/ （g·L^-1）	ρ（SO₄^2-）/ （g·L^-1）	ρ（Li⁺）/ （mg·L^-1）	ρ（TDS）/ （g·L^-1）
开采前	潜卤水（29）	115~814 （286）	4.59~40.14 （18.37）	53.50~133.50 （92.10）	3.70~20.00 （10.89）	140.80~233.50 （178.45）	5.19~94.31 （39.72）	100~980 （494）	283~422 （342）
开采前	承压卤水（36）	122~1 350 （340）	4.17~35.35 （21.43）	52.00~107.00 （81.90）	3.86~18.40 （12.03）	18.60~1 808.00 （218.32）	10.67~80.27 （36.73）	104~1 210 （605）	230~3 632 （421）
开采后	潜卤水（22）	121~325 （193）	5.32~47.71 （24.12）	50.33~118.85 （90.38）	3.56~17.21 （11.26）	162.20~198.74 （176.37）	18.83~101.17 （56.50）	129~1260 （629）	329~391 （359）
开采后	承压卤水（37）	128~913 （257）	2.82~55.63 （20.26）	44.27~118.50 （94.60）	1.60~17.55 （13.38）	169.02~192.86 （178.74）	8.35~81.44 （46.53）	60~1386 （561）	312~379 （351）

开采前后	源						汇						均衡计算
开采前后	N/（10⁸ m³·a^-1）	N_c	P₁/（10⁸ m³·a^-1）	P_1c/（10⁴ t·a^-1）	P₂/（10⁸ m³·a^-1）	P_2c/（10⁴ t·a^-1）	K/（10⁸ m³·a^-1）	K_c/（10⁴ t·a^-1）	E_湖/（10⁸ m³·a^-1）	E_河/（10⁸ m³·a^-1）	E_晶/（10⁸ m³·a^-1）	E_鸭湖/（10⁸ m³·a^-1）	ΔQ/（10⁸ m³·a^-1）	ΔQ_c/（10⁴ t·a^-1）
开采前	0.058	忽略不计	3.24	55.38	0.10	0.78	无	无	3.38	0.005 6	0.073	无	-0.060	-569.4
开采后	0.290	忽略不计	1.10	32.01	0.10	0.78	0.2	2 380	无	0.005 6	无	4.11	-2.83	-3 331.0

含水层厚度				水位标高
原孔/m	新孔/m	差值/m	下降率/%	原孔/m	新孔/m	水位/m
4.82	2.44	-2.38	-49.38	2 682.77	2 680.08	-2.69
5.81	1.75	-4.06	-69.88	2 682.38	2 676.87	-5.51
3.57	0.99	-2.58	-72.27	2 682.57	2 677.73	-4.84
8.18	1.01	-7.17	-87.65	2 684.46	2 679.84	-4.62
7.28	0.52	-6.76	-92.86	2 682.38	2 677.67	-4.71
4.15	0.65	-3.50	-84.34	2 682.26	2 676.87	-5.39
4.55	2.07	-2.48	-54.51	2 682.87	2 678.84	-4.03
1.97	0.59	-1.38	-70.05	2 682.39	2 680.48	-1.91
5.36	0.63	-4.73	-88.25	2 682.94	2 679.00	-3.94
3.72	0.16	-3.56	-95.70	2 683.95	2 678.72	-5.23
4.32	0.46	-3.86	-89.35	2 683.96	2 680.29	-3.67
1.83	0.20	-1.63	-89.07	2 683.96	2 680.39	-3.57

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Variation characteristics of LiCl deposit under condition of mining in East Taijnar Salt Lake,Qaidam Basin

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