Development of Mass Production Process of Singing Sand

本研究的目的是为了回收因海边污染而失去“声音”的歌砂，设计一种歌砂的规模化生产工艺。虽然将石英砂转化为歌砂的洗涤方法很多，但本研究采用具有水平摆动机构的洗衣机对石英砂-水泥浆进行了各种洗涤实验。使用的硅砂来自山形县Iide镇的Osodani。通过测量玻璃棒插入砂床发出的声压来评价洗涤石英砂的清洁程度，得到的基本结果如下：1.长期洗涤后，硅砂发出歌声。2.通过超声处理和添加表面活性剂，缩短了洗涤时间。3.存在洗涤效果的最佳硅砂浓度。4.小于300um的硅砂不发出歌声。5.洗涤去除的颗粒为0.2-100微米的硅酸盐矿物微粒。6.洗涤机转速越高，石英砂的洗涤效果越好。7.洗涤机理是由于石英砂与水之间的剪切力和二氧化硅颗粒之间的接触作用。8.使用水流的洗衣机被认为是生产歌沙的有效设备。

It is the purpose of this study to design a mass production process of singing sand because of the recovery of singing sand which lost "sound" by seaside pollution. Although there are many washing methods to change silica sand into singing sand, various washing experiments of silica sand-water slurry were carried out using a washing machine with a horizontally shaking motion mechanism in this study. The silica sand used was from Osodani in Iide town of Yamagata prefecture. The degree of cleanness of washed silica sand was evaluated by measuring sound pressure emmitted from the sand bed into which a glass rod was penetrated.The principle results obtained are as follows : 1.Silica and emitted singing sound by washing for a long time. 2.Washing time was reduced by the pretreatment of ultrasonication and by the addition of surfactant. 3.The optimum concentration of silica sand for washing effect existed. 4.Silica sand with the size smaller than 300mum did not emit singing sound. 5.The removed particles by washing were the fine particles of silicate mineral with the range of 0.2-100mum. 6.Washing of silica sand was promoted at higher velocity revolution of washing machine. 7.Washing mechanism was due to the shear stress between silica sand and water and to the contact interactoin between silica particles. 8.The washing machine using water stream is considered to be effective to produce singing sand.