Not really, no mercury from Minechem. Despite minechem's many pluses mercury didn't have a dust form so it didn't get a recipe when I added everything, reminds me I don't think I ever released the bugfix, I'll have to get on that in the next couple of days when my schedule actually gives me time to poke through it again. It's also worth noting you'll be wanting the synthesiser for fuel, the default atomic fuels of hydrogen and carbon have been made near useless so if you want something out of your organic stuff your best bet is Methyl Methacrylate, it's what slimeballs are made of and the best minechem fuel at about 3.5x that of coal, other compounds exist and cellulose isn't totally bad but it's the best.
To elaborate on mercury though, the only way to get it from basic minechem is from slimeballs which have a 90% chance of giving either a Poly(methyl Methacrylate) which is used to create one, a mercury atom, or 10 water molecules. That means that after accounting for recycling each slimeball is worth about 0.43 mercury atoms, so a full 1000mB of mercury which is 16 atoms is 37.3 slimeballs, this however cannot be used to create mercury as it doesn't have a dust, what can be done however is to synthesise it with sulfur to create cinnabar which you can then centrifuge into sulfur dust and GT mercury, decompose the sulfur into minechem sulfur atoms and repeat as many times as you want. So the key ingredient is slimeballs, you've got multiple ways you can acquire them from building a mob farm in slime chunks to ender io or thaumcraft slime spawners to a pneumaticcraft mob farm to just synthesising them with other organic compounds with minechem, alternatively if you've managed to reach HV tech you can build a fusion reactor and create them from milk, one bucket of milk provides 4 calcium so that's a 16:1 ratio of milk to mercury. You specifically need forestry milk though, that could be fixed with minetweaker I'm pretty sure though.
