1. Raw Material Pre-Treatment
- Strictly sort and clean raw materials to remove soil, sand, stone and inorganic impurities in advance.
- Remove fabric, fiber and foreign sundries before pyrolysis to avoid forming fixed ash after high-temperature cracking.
- Crush materials evenly to ensure uniform pyrolysis reaction.
2. Optimize Pyrolysis Process Conditions
- Control reasonable pyrolysis temperature, avoid excessive high temperature which causes mineral components to fuse and form stable ash.
- Adjust heating speed and material residence time to fully separate organic carbon and inorganic ash components.
- Maintain stable inert atmosphere to reduce oxidative ash generation.
3. Physical Ash Removal after Pyrolysis (Main Industrial Method)
- Air classifier: Separate light ash powder from heavy char particles by wind sorting.
- Vibrating sieving: Classify particle size to screen out coarse ash slag.
- Magnetic separator: Remove iron-based ash and metal impurities efficiently.
- Gravity sorting: Separate high-density inorganic ash from low-density pyrolysis char.
4. Deep Chemical Purification (For Low-Ash High-Grade Products)
- Adopt acid leaching process to dissolve silicate, metal oxide and other inorganic ash substances.
- Conduct repeated water washing and neutralization treatment to eliminate residual acid and soluble ash.
- Apply high-temperature secondary calcination to further remove volatile ash components.
5. Post-Processing Refining
- Carry out ultrafine grinding to dissociate wrapped internal ash inside char particles.
- Match multi-stage combined sorting process to greatly lower final ash content.
