Table 9 The main physicochemical parameters of the liquid phase (brine temperature, concentration of Li⁺ and CO₃^2-) and their changes before brine discharge in cross-year brine mixing production test.

Sample No	T_{b, max} (°C)	T_{b, avL} (°C)	T_{b, av} (°C)	△T_b (°C)	C_Li⁺_{, maxL} (g/L)	C_Li⁺_{, minL} (g/L)	C_Li⁺_{, av} (g/L)	△C_Li⁺ (g/L)	C_CO3^2-_{, maxL} (g/L)	C_CO3^2-_{, minL} (g/L)	C_CO3^2-_{, av} (g/L)	△C_CO3²⁻ (g/L)
S10	34.5	32.4	28.5	22.5	1.53	1.33	1.31	0.71	23.94	20.95	19.33	8.03
S11	33.7	31.6	28.3	27.3	1.87	1.59	1.50	0.78	20.01	14.53	15.32	6.91

T_{b, max}: maximum brine temperature, °C; T_{b, avL}: average brine temperature in the LCZ, °C; T_{b, av}: average brine temperature, °C; △T_b: brine temperature change from brine irrigation to brine drainage, °C; C_Li⁺_{, maxL}: maximum concentration of Li⁺ in brine of the LCZ, g/L; C_Li⁺_{, minL}: minimum concentration of Li⁺ in brine of the LCZ, g/L; C_Li⁺_{, av}: average concentration of Li⁺ in brine, g/L; △C_Li⁺: concentration change of Li⁺ in brine from brine irrigation to brine drainage, g/L; C_CO3^2-_{, maxL}: maximum concentration of CO₃^2- in brine of the LCZ, g/L; C_CO3^2-_{, minL}: minimum concentration of CO₃^2- in brine of the LCZ, g/L; C_CO3^2-_{, av}: average concentration of CO₃^2- in brine, g/L; △C_CO3^2-: concentration change of CO₃^2- in brine from brine irrigation to brine drainage, g/L.

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