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    Low temperature process for making radiopac materials utilizing industrial/agricultural waste as raw material
    25.
    发明申请
    Low temperature process for making radiopac materials utilizing industrial/agricultural waste as raw material 有权
    以工业/农业废物为原料制造放射性物质材料的低温工艺

    公开(公告)号：US20060066013A1

    公开(公告)日：2006-03-30

    申请号：US11026115

    申请日：2005-01-03

    申请人： Sudhir Amritphale ,  Navin Chandra ,  Narayanrao Ramakrishnan

    发明人： Sudhir Amritphale ,  Navin Chandra ,  Narayanrao Ramakrishnan

    IPC分类号： C04B35/64

    CPC分类号： C04B33/1352 ,  C04B33/1322 ,  C04B33/20 ,  C04B33/30 ,  C04B33/32 ,  C04B35/62213 ,  C04B35/6306 ,  C04B35/6309 ,  C04B2235/3201 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3215 ,  C04B2235/3232 ,  C04B2235/3262 ,  C04B2235/3272 ,  C04B2235/96 ,  Y02P40/69

    摘要： A novel process is for making ceramic based radiopac materials useful for X-ray radiation attenuation. The process is lead as well as rare earth free and thus obviates (i) the use of conventionally used lead metal and its compounds—which are toxic in nature and are heavy weight as the density of lead is 11.34 gm/cm-2. Further the low melting points of lead (325° C.) prohibits its use in high temperature shielding structures and (ii) the use of Rare earth is restricted because they are very costly and scarcely available. The novel process of the present invention utilizes different varieties of waste as raw materials such as fly ash (from thermal power plants), Red mud (from aluminum production), Rice husk silica (an agro waste) and pyrophyllite (an underutilized clay mineral). These waste materials contain various necessary constituents required for making radiopac materials namely silicon, titanium, iron and aluminum. The presence of different mineralizers in the raw materials used and use of phosphatic binders significantly helps in obtaining the radiopac materials, at relatively low temperature of 920° C. itself and thus leads to saving of considerable heat energy. Further as the waste are generated in powder form, the use of these waste also helps in saving on the account of grinding energy. The radiopac materials obtained by the novel process of present invention are capable of withstanding ambient to high temperature and thus finds wide applications in making aprons, gloves and ceramic tiles, bricks for attenuation of X-ray radiations. The radiopac materials are useful as materials for construction of partition wall of X-ray room in hospitals, research institutes and industries. Apart from this radiopac materials an also be used and in making high temperature X-ray attenuation structures.

    摘要翻译： 一种新颖的方法是制造用于X射线辐射衰减的陶瓷基辐射材料。 该方法是铅和无稀土元素，因此避免（i）使用常规使用的铅金属及其化合物，因为铅的密度为11.34gm / cm-2，其本质上是有毒的并且重量很重。 此外，铅的低熔点（325℃）禁止在高温屏蔽结构中使用，和（ii）稀土的使用受到限制，因为它们非常昂贵并且几乎不可用。 本发明的新方法利用不同品种的废弃物作为原料，如飞灰（来自火力发电厂），红泥（来自铝生产），稻壳二氧化硅（农用废物）和叶蜡石（未充分利用的粘土矿物） 。 这些废料包含制造放射性物质（即硅，钛，铁和铝）所需的各种必需成分。 在使用的原材料中使用不同的矿化剂和使用磷酸盐粘合剂的存在显着有助于在相对低的温度为920℃的本身下获得放射性材料，从而导致相当大的热能的节省。 此外，由于废物以粉末形式产生，因此使用这些废物也有助于节省研磨能量。 通过本发明的新方法获得的放射性材料能够耐受环境至高温，因此在制造围裙，手套和陶瓷砖，用于衰减X射线辐射的砖方面具有广泛的应用。 射电材料作为医院，研究机构和行业X射线室隔墙施工材料。 除了这种放射性材料之外，还可以使用和制造高温X射线衰减结构。