WP has an image of it[1] and states that it is a Potassium Chloride factory at Lop Lake[2]. It's not visible on Bing Maps[3], so perhaps it's relatively new.
I think that area is part of the Turpan basin which has been a salt mining zone for centuries. I'm totally guessing here, but the Google Maps images look like a massive salt evaporation facility.
If you zoom in, you can see it's not a single structure or building. Most of the area (all the blue parts) is some kind of liquid, probably water. Zoom in far enough and you can see buildings on the edges of the pools.
Follow the little blue line upwards from the structure and you'll see a dam clearly pumping water, and the canals extend up to around 50km.
The Map View also shows a large area around it as a huge lake, so I'm guessing they drained the lake. Still pretty impressive in my opinion.
Or evaporation mineral collection ponds or something of that nature. The facility in Wendover on the salt flats is pretty large too though there's no ponds like these images appear to show. There's lots mineral collection ponds like this in California and Nevada.
http://maps.google.com/maps?hl=en&ll=40.42761,90.793762&...