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

研究了以水冷高炉铁渣为原料合成高性能高分子材料的工艺。钙作为一种主要元素存在于铁渣中，是铝硅酸盐大分子铝粉和硅铝石大分子生成的有力抑制剂之一。以常温下滴加浓盐酸的炉渣为原料，制备了纯硅胶。将由硅胶、氢氧化钠和硝酸铝溶液制备的硅酸钠溶液混合，然后加入稀铵溶液，制得正硅酸铝凝胶。对正硅酸铝凝胶溶液进行水热处理，得到了不同硅铝比的铝硅橡胶系列大分子粘土矿物。最大的伊莫石晶体呈细纤维状，长度超过10μm。对于钙含量较小的矿渣，用氢氧化钠溶液对矿渣微粉进行水热处理，得到硅酸盐凝胶，经过短时间的水热处理即可制得硅酸盐系列产品。分子筛的结构、硅铝比、结晶度和高分子粘土产物的形态可以控制分子筛的性能和吸附性能。关于这些结果的报告现在已经准备好了。

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.