initial placement, and promotions

im just curious how the initial placements work in ranked. i have ended in silver in at least 3 seasons only to be placed back in bronze 5 during my next placements. its a little bit frustrating given that it takes almost 100 games to get back out of bronze again from that low even with an almost 60% win rate.

this season, i have 53 wins and 36 losses. thats a winrate of 59.6%, and i only made it back to silver on the last game. http://www.lolking.net/summoner/na/19040451