45 degrees is not enough angle. I have been in the salt industry for over 30 years (and just down the road from you in Goderich)- I would imagine you are getting ratholing pretty good there.

If you have the height I would be looking more into the 55 to 60 cone angle.

You may want to look into mass flow design. Also have a read here http://www.bulk-online.com/Ask/askme.php?id=12

BTW - you did not attach a sketch. ■

I am at the salt mine in Goderich.

Your attachment is not working. When you are typing your post scroll down until you see a button that says "manage attachments" click on it and a pop up will open then click "browse" then locate your file on your system then click "upload" then close that pop up window and then click "post". ■

As the silo is emptied daily mass flow is not required to prevent dead pockets of storage but would overcome the problem, although at a cost. Replacing the cone would be expensive and either lower the outlet or shorten the body section, so is not seen as an attractive solution. Inserts offer many options, see article is Chemical Engineering, July 2010, PP 32 - 37, but are not recommended to be designed by non-experts. A 'Bates' type insert, that stimulates wall slip by acting as a hoop stress cutter would be the simplest form of conversion and may be adequate, but would require verification by testing. A classical cone-in-cone is superficially possible, but is most unlikely to be suitable for a 45 degree cone as the wall angles are not steep enough to guarantee wall slip and would require the existing cone to be removed to be fitted. The next best options seems to be a hybrid comprising a combination of a central funnel flow cone-in-cone that extends to 'Lynflow' type arms, fit in sections that will each pass through the outlet. With restricted central flow to encourage the preferential discharge of peripheral contents to wipe the walls in mass flow, this would clear the silo better. Of course 'brute force' maybe tried with vibrators or fitting a bin activator. I have even seen pneumatically operated sledgehammers fitted to recalcitrant hoppers by those who would not pay for exert advice. ■

45 degrees to the horizontal, sounds like someone bought a grain bin! ■