In order to make good compost you need moisture in the bin. Have a look at Chris Beardshaw's video where he talks about layering wet materials with dry materials. It sounds as though your compost hasn't decomposed enough yet to be used as a mulch. Putting unrotted material on beds can actually harm plants. If you have a lawn, the best thing to do would be to layer wet grass clippings with the dry, half-rotted compost. Then it will all rot down well together. You may need to buy/make a second compost bin so that you can do this more easily. If you're not going to be collecting grass clippings, keep watering your compost. It will eventually rot down. Give it a really good soak as it can be hard to make water penetrate a really dry bin. If you can, move it to a shady area, so it doesn't dry out in the sun. When the bin is cooler and moister, it won't attract the ants.