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.

Natural sand mining limit, make artificial gravel rapid development in society. Industry rapid development, the machinery industry is the rapid development of the s, was already gone. Artificial stone production investment, not just the need to consume huge Labour force, and the efficiency is not high also, the result is that took a lot of…