1. Nepheline Sludge as a Feedstock for building Materials Graduate Student: Alyona E. Kovyazina Institute of High Technology Physics, TPU Graduate Advisor: Vasiliy A. Lotov, Prof., Doctor Linguistic Advisor: Larisa V. Maletina, Ass. Prof., Ph.D.

2. Outline Nepheline Properties Aim Materials & Methods Results

3. Nepheline Properties 80-85% Belite Chemical composition is similar to portland cement Use as a filler in: Ceramic Binder Glass productions Nepheline sludge

4. Aim Aim – production of the durable crystalline matrix of material based on nepheline sludge

5. Main components: - nepheline sludge - quartz sand salt additives Raw materials Quartz sand Sodium sulfate Aluminum sulfate Ferrous sulfate (II)

6. Methods Medium-dry extrusion - ratio of main components – 70/30 - time of hardening – 14 days - moist conditions Casting - ratio of main components – 50/50, 60/40, 70/30 - time of hardening – 14 days - air conditions Hydrothermal treatment - ratio of main components – 50/50, 60/40, 70/30 - time of hydrothermal treatment – 3 hours - time of hardening – 1 day - air conditions

7. Compressive strength of samples, МPа Compressive strength, М P а Results

8. composition limit of compressive strength, MPa 50:5060:4070:30 Na 2 SO 4 additive2,113,154,72 Al 2 (SO 4 ) 3 additive1,782,152,91 Compressive strength of casting samples, MPa composition limit of compressive strength, MPa 50:5060:4070:30 Na 2 SO 4 additive5,277,2310,61 Al 2 (SO 4 ) 3 additive3,785,038,12 Compressive strength of samples after hydrothermal treatment, MPa

9. Further research Hardening condition Hydrothermal treatment Porous structure production

10. Thank you for your attention!