See now what the problem with all these people that say theyve got banned was because they let it sit for a very long time, what you all should do is set your scripts to alch for about 3 hrs, come back another hour and repeat that, only make sure its not set like 00hrs 59mins 59 secs all the time, make it like 00 hrs 58mins 13secs. always different jagex logs your time so it has to be different...also make it click to stand in another area every other 15 mins..do this and you can alch 55-99 no problem..because thats what i did for me, my bro and my friend.
EDIT: Yes it takes longer but its well worth not getting banned.
If this works for you please vouch for me.