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首页> 外文期刊>Chemical engineering journal >Effect of silicon dose on preparation and coagulation performance of poly-ferric-aluminum-silicate-sulfate from oil shale ash
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Effect of silicon dose on preparation and coagulation performance of poly-ferric-aluminum-silicate-sulfate from oil shale ash

机译：硅用量对油页岩灰中聚硅酸铝铁的制备及混凝性能的影响

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The oil shale ash was explored as a raw material for a type of new inorganic coagulant poly-ferric-aluminum-silicate-sulfate (PFASS) with various (Al + Fe)/Si molar ratios. The coagulation performances were evaluated by jar test in treating sewage, the zeta potential of the sewage was also used to evaluate the charge neutralization ability, and the microscopic images of floes were measured by transmitting and reflecting polarizing microscope (TRPM). Meanwhile, the structure and morphology of PFASS were characterized by Infra-red spectra (FT-1R), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results of FT-IR indicate that at lower of silicon, the peaks corresponding to Fe-OH-Fe, A1-OH-A1, Fe-OH and Al-OH vibration are observable, with silicon dose further increasing, the above bonds are probably transformed to Fe-O-Fe, Al-O-Al, Fe-O and Al-O respectively, furthermore, Si-O-Fe and Si-O-Al bonds can be formed. XRD spectra illustrates that PFASS consists of FeSO4·H2O, NaAl(SO4)2·(H2O)6 and new chemical species rather than a simple mixture of the raw materials. TEM result displays that a handful of silicon is propitious to form three dimensions structure, and the chain-net is compact, however the superabundant silicon destroys the chain-net structure. The coagulant performance results illustrate that the coagulant dosage and (Al + Fe)/Si molar ratios affect the removal of turbidity and COD in sewage, as well as the turbidity removal is much larger than COD removal at the same dose.
机译：探索了油页岩灰作为一种新型的无机凝结剂，其具有不同的（Al + Fe）/ Si摩尔比的聚硫酸铁铝硅酸盐硫酸盐（PFASS）。通过罐式试验评价混凝处理污水的性能，还利用污水的ζ电位评估电荷的中和能力，并通过透射和反射偏振显微镜（TRPM）测量絮凝物的显微图像。同时，通过红外光谱（FT-1R），X射线衍射（XRD）和透射电子显微镜（TEM）对PFASS的结构和形貌进行了表征。傅立叶变换红外光谱（FT-IR）的结果表明，在硅的下部，可以观察到对应于Fe-OH-Fe，Al-OH-Al，Fe-OH和Al-OH振动的峰，随着硅剂量的进一步增加，上述键为可能分别转化为Fe-O-Fe，Al-O-Al，Fe-O和Al-O，而且可以形成Si-O-Fe和Si-O-Al键。 XRD谱图表明PFASS由FeSO4·H2O，NaAl（SO4）2·（H2O）6和新的化学物质组成，而不是由原料的简单混合物组成。 TEM结果表明，少数硅有利于形成三维结构，链网致密，而过剩的硅破坏了链网结构。混凝剂的性能结果表明，混凝剂的添加量和（Al + Fe）/ Si摩尔比会影响污水中浊度和COD的去除，并且在相同剂量下，浊度的去除远大于COD的去除。

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