The Ash2Salt process is built upon two preceding steps. Fly ash is washed with water in the first step resulting in a washed ash (residual sand), and a leachate of mainly chloride salts and heavy metals that continues to step two.
In step two, sulphides are used to precipitate heavy metals from the leachate and the resulting chloride saturated liquid then continues to the Ash2Salt process. Ash2Salt process separates CaCl2 (aq), NaCl, and KCl by the use of a single evaporator. In addition, water extracted from the evaporator is recirculated to the initial washing step.
In a wash-plant for fly ash without the Ash2Salt process, following limitations exist:
- The wash-plant must have permission to discharge large amounts of chloride effluents
- The chloride content of the ash can vary depending on what the incineration plants burn resulting in different amounts of chloride effluent must be discharged.
- A need for fresh water
The main advantages of having the Ash2Salt process are:
- Enable washing of fly ash without a discharge of chlorides
- High tolerance for variations of chloride content in the ash
- Creates a source of income by producing pure commercial salts and ammonia
- No need for fresh water since the Ash2Salt washes fly ash with land fill leachate and process water.
EasyMining’s patented Ash2Salt process is unique and can extract commercial salts from high chlorine containing fly ashes. After washing, the ash residue can be land filled without an exemption for high chloride contents. The Ash2Salt process can extract commercial grade:
- Potassium chloride (KCl)
- Sodium chloride (NaCl)
- Calcium chloride (CaCl2)
- Aqueous ammonia solution or ammonium sulfate