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

Table 4

The operating factors of orthogonal experiments.

Code	Factors’ name	Level 1	Level 2	Level 3
A	Acid type	Acetic acid	Citric acid	Lactic acid
B	Temperature (°C)	35	45	55
C	Concentration (%)	7	9	11
D	Reaction time (min)	60	120	180