Synthesis of High Functional Macro-molecule Clay Materials from Iron Slag

研究了以高炉水淬渣为原料合成高分子功能材料的工艺。钙是铁渣中的主要元素，是生成铝硅酸盐大分子铝氧络酮和伊毛沸石的强抑制剂之一。以炉渣为原料，在室温下滴加浓盐酸，制备了纯硅胶。将由硅胶制备的硅酸钠溶液、氢氧化钠和硝酸铝溶液在剧烈搅拌下混合，然后加入稀铵溶液以制备正硅酸铝凝胶。采用水热法对原硅酸铝凝胶溶液进行处理，得到了具有不同硅铝比的硅铝异石-伊毛戈兰系列大分子粘土矿物。最大的伊毛戈兰晶体呈10 μm以上的细纤维状。对于含钙量较低的矿渣，用氢氧化钠水溶液预处理矿渣粉得到的水玻璃凝胶经短流程水热处理后，可得到钙钛矿-伊毛戈兰系列产品。高分子粘土产品的晶体结构、硅铝比、结晶度和形态特征可以控制分子筛的结构和吸附性能。关于这些结果的报告现已编写完毕。

Synthesis process of high functional macro-molecule material from water quenched blast furnace iron slag was investigated. Calcium, containing in an iron slag as a major element, is a one of powerful inhibitor to produce aluminosilicate macromolecules of allophone and imogolite. As a starting material, a pure silica gel was prepared from the slag pretreated by dropping concentrated hydrochloric acid at room temperature. A sodium silicate solution which prepared from the silica gel, sodium hydroxide and aluminum nitrate solutions were mixed with vigorous stirring, then dilute ammonium solution was added to produce an aluminum orthosilicate gel. Allophone-imogolite series macro-molecule clay minerals with various Si/Al ratios were obtained by treated the aluminum orthosilicate gel solution hydrothermally. The biggest imogolite crystal shows fine fiber form over 10 μm in length. In the case of slag with smaller calcium content, it was also found that allophone-imogolite series products could be obtained by short process of hydrothermal treatment from sodium silicate gel which obtained from the slag powder pretreated with sodium hydroxide solution. Molecular sieves and adsorption properties could be controlled by the crystal structure, Si/Al ratio, crystallinity and morphological properties of macromolecule clay products. Reports about these results have been prepared now.