Free Flow Chemistry Reaches New Horizons
Free Flow recently conducted treatability studies on industrial slag material from China. The criteria was stringent as China has their vrsion of a water leach test that is similar to the SPLP in the U.S
Typically the SPLP test is difficult to pass with a reagent added as most chemistries raise the pH to a level that induces leaching activity.The Free Flow chemistry however had no difficulty meeting the criteria for China. A 2.5% dose confirmed all metals well below the Chinese criteria.
| Element | Concentration (mg/kg; pH=3.37) |
Untreated Leaching Analysis (SPLP) |
Chinese Leaching Test (HJ/T557-2010) Criteria |
SPLP Treated with 1% FF-100 (mg/L; pH=5.83) |
SPLP Treated with 2.5% FF-100 (mg/L; pH=8.81) |
| Antimony | 88 | < 0.080 | – | – | – |
| Barium | 28 | 0.027 | – | – | – |
| Beryllium | < 0.25 | – | – | – | – |
| Chromium | < 4.0 | < 0.020 | – | – | – |
| Copper | 25 | 0.11 | – | – | – |
| Iron | 42,000 | 38 | – | – | – |
| Thallium | < 5.0 | < 0.025 | – | – | – |
| Vandium | < 8.0 | < 0.040 | – | – | – |
| Arsenic | 900 | < 0.013 | 0.5 | 0.073 | < 0.13 |
| Cadmium | 66 | 0.31 | 0.1 | 0.078 | < 0.063 |
| Lead | 14,000 | 7 | 1 | 0.015 | 0.18 |
| Selenium | < 2.5 | < 0.013 | 0.5 | < 0.080 | < 0.80 |
| Zinc | 1,800 | 3.1 | 5 | 0.63 | < 0.063 |
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