Leveling concrete floor

[Idrisdraig]

I've got an uneven concrete floor about 40m^2 that needs to be smoothed and coated with either eppoxy/resin screed/paint.
A lot (but not all) of the floor has bumps and ridges of up to about 5mm resulting from a coarse aggregate and tamping.
About half of the floor has some sort of paint on it. It's not particularly flakey, but has been worn back to the concrete in some areas and on high spots.

If I hire a grinder (and dust extraction) ...
1. How long would it take to grind the floor so it only needs epoxy floor paint?
2. What volume of dust is likely to be generated and how do you dispose of it?

Are there any self leveling epoxy/resin compounds that could be used?
The products I've found online that call themselves high build can't be laid much more than 2mm thick.

Or, any idea on what I should budget to get a specialist flooring company to take on the job?

 

[dazlight]

You would be best grinding it flat which would take a day.
If a good extraction vac with it then hardly any dust.
You might need to put a smoothing compound down before you do the epoxy to get it nice and smooth.

 

[Idrisdraig]

Thanks.
If a smoothing compound is likely to be necessary, is it not easier to just use a self leveling compound to start with and forget about grinding?

By "what volume of dust", I meant how much will accumulate in the vac, and how do you dispose of that? (Presumably the hire companies don't want to have to dispose of it.)
I also meant to ask, what would be the likely cost of grinding disc for an area this size?

 

[dazlight]

Take it down the tip. I’ve just put it in builders bags and throw it in my skip.
You can miss the grinding out and just screed (SLC) it but could use a lot more.
I’d get a local flooring company it to get a proce and see what you think.