国内的砂石分离机在实现固液分离的同时，还对砂石进行筛分，这就需要使用滚筒筛来进行筛分。筛网只要将粒径相差较大的沙子和石子分开就可以了。这样分离的沙石不仅非常的干净，而且从不同的排料口排出，形成不同的堆积料。但是并不是说设备升级的越高，就越符合可持续发展经济。我们从经济和使用上来分析的话，回收的骨料在实际的混凝土的生产中所占的比例非常的小，没有分离彻底的砂石料不仅不会影响混凝土的强度，相反的还会有略微的增加。

    In the concrete mixing station, sand separator has become a kind of form a complete set of machinery and equipment. Domestic in the study of sand separator although started late, but also invested a lot of energy, thus gradually catch up with the world advanced level. But foreign reach after solid-liquid separation in research and development began to stagnate, at present has been to maintain the status quo. We need to talk about in terms of economy and the use of domestic seems relatively compared with foreign advanced equipment, whether to have the competitive advantage.

    Sand separator abroad there is no screening equipment, that is more depend on water to wash, concrete and aggregates and water separation. In the slag material consists of feed hopper, after receiving injection screw roller sand separator and after rotating separation, water mixture by low discharge, such as sand and gravel aggregate mobile device by high discharging, the sand, no separate are mixed together. Isolated each other have entrained sand and gravel, slurry, sand, cement, sand and gravel outsourcing sand slurry outside bread, prone to agglomerate.

    Domestic sand separator in realization of solid-liquid separation at the same time, also carried out on the sand screening, it will need to use the drum sieve sieve. Screen as long as separate size large difference of sand and gravel. Such a separation of sand is not only very clean, and from different discharging mouth eduction, form the accumulation of different materials. But is not to say that the equipment to upgrade the higher, the more accord with the sustainable development of economy. We came up from economy and the use of analysis, the recycled aggregate of concrete in the actual production of the proportion is very small, not the application of the thorough separation will not affect the strength of concrete, instead there will be a slight increase.