水玻璃砂浇铸后的砂块要此粘土砂硬,尤其是面砂太厚时,这种情况更显著.目前许多工厂的旧砂处理都很简单,将浇过的旧砂过筛(在过筛时砂块用铁铲敲碎)后就使用.由于水玻璃砂块较硬,过筛时无法敲碎,引起旧砂回用上的困难.我们曾把旧砂回用次数对混合料性能的影响进行试验,方法如下: This is even more noticeable when the sand that is cast with sodium silicate sand is harder than this, especially when the sand is too thick, and the old sand treatment in many plants is straightforward, Sieve sand shredded with a shovel) after use because the water-glass sand block harder when the sieve can not be cracked, resulting in the reuse of old sand on the difficulties we have to reuse the number of sand on the mixture performance The impact of the experiment, as follows: