With the rapid development of building industry, the sand has a big demand for building engineering. The river sand, as a local resource, can not reborn again at a short time with a phenomenon of decreasing of natural sand in the world even no natural sand existing in some area.

The limestone composition analysis: Main mineral composition is calcite, limestone mineral particles and the crystal structure, surface smooth, a small granule. Color is black, grey, white, yellow and brown. Limestone formation of seawater, so its name, main component is calcium carbonate, lime with quicklime and hydrated lime. The main composition of quick lime is CaO,…