Research on Enrichment of P₂O₅ from Low-Grade Carbonaceous Phosphate Ore via Organic Acid Solution

Table 5

The results of orthogonal experiments.

Level	Factor
	A	B	C	D	Index
	Acid type	Temperature (°C)	Concentration (%)	Reaction time (min)	P2O5 (%)
1	Acetic	35	7	60	28.43
2	Acetic	45	9	120	31.05
3	Acetic	55	11	180	32.43
4	Citric	35	9	180	32.75
5	Citric	45	11	60	31.74
6	Citric	55	7	120	32.83
7	Lactic	35	11	120	34.19
8	Lactic	45	7	180	32.54
9	Lactic	55	9	60	31.79