Research Article
Extraction of Zinc and Manganese from Alkaline and Zinc-Carbon Spent Batteries by Citric-Sulphuric Acid Solution
Table 2
Levels of factors investigated in the second series of leaching tests.
| | | Level | Factor | | () | () | (0) | (+1) | (+) |
| A | Sulphuric acid | 0.5 M | 1 M | 1.5 M | 2 M | 2.5 M | B | Citric acid | 0 M | 0.075 M | 0.15 M | 0.225 M | 0.3 M | C | Pulp density | 10% | 15% | 20% | 25% | 30% | D | Temperature | C | C | C | C | C |
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