The list of experimental conditions for reactive extraction.

Variable factors	Group 1	Group 2	Group 3	Group 4	Group 5	Group 6	Other factors
Temperature (°C)	28	38	48	58	67	78	700 rpm, 300 ml/20 g, 100 v% formic acid
Stirring rate (rpm)	200	300	500	700	900	—	48 °C, 200 ml/20 g, 100 v% formic acid
Acid dosage (ml)	50	100	150	200	300	400	38 °C, 500 rpm, 100 v% formic acid
Acid concentration (v%)	20	40	60	80	100	—	38 °C, 500 rpm, 200 ml/20 g