Hello,

Use Hi Chrome castings instead of Ni hard for longer life.

We are making spares for only impactors and export most of our castings.

BR

Ankit Chandra

98184 36295

We have been using a vertical shaft impactor for producing fines of -4.75 mm. The material has 89%silica and has abnormal wear in all the liners. We are presently using ni-hard castings for the distribution cone and the wear parts and tungsten carbide for the rotor.

Could anyone suggest a better liner material and for the casting

Regards

H. Sankaranarayanan

Vice President Operations

Taurian Iron and steel co pvt ltd

Mumbai

91-9819715435[/QUOTE] ■

hi chrome liners.......pig-iron and plus minus 11 percent chrome adder is normal for VSI crushers.

you have very high silica content which basically will RUN YOU INTO THE POOR HOUSE on wear costs in my experience. A few things you could try:

1. go to PIG IRON pour impellers and anvils.....with a CERAMIC LINER insert .....will decrease wear costs

2. go to PIG IRON pour with DOUBLE CERAMIC inserts in the impellers and the anvils.....will further increase the wear life between changes.

3. IF STILL COMPLETELY EXPENSIVE AND UNacceptable life with those ceramics which it sounds like it would be then do this:

4. pull the anvil ring out, and replace with a ROCK SHELF....and change the methodology from ROCK ON STEEL IMPACTING.....to ROR or ROCK ON ROCK crushing.......you will decrease your wear costs by 3-4 times from ROCK ON STEEL Setup.

5. this will eliminate the high wear costs.....but, WILL DECREASE FOR TOTAL tons throughput...for sure as we are now, shaping the stone on its own hardness.....vs IMPACTING and breaking it

6. if all of that fails......you must go to plan B........a CONE CRUSHER...which will crush now by COMPRESSION vs IMPACT.....and all will be solved.

Crushing your way to happiness, i remain. George Baker ■

We have used SAG and Ball milll liners with 27% chrome, white iron having a BRinell of about 600. Costly, on first batch, but does last for millions of tons just like mill wear. We used this in chutes at Palabora that achieved clost to 40 million tons on 100 mm thick castings. ■