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采用H2O2氧化Fe2+并供应4种不同浓度葡聚糖的方法,探讨在H2O2氧化体系中葡聚糖对次生铁矿物形成的影响。结果表明:葡聚糖对次生矿物的形成具有明显的抑制作用;随着葡聚糖浓度的提高,次生矿物内的Fe含量降低,而S含量没有显著变化,且所有处理的K含量均较低;没有葡聚糖处理的次生矿物XRD特征峰与黄钾铁矾吻合,而添加葡聚糖后形成的次生矿物的特征峰与施氏矿物吻合,但是所有处理的次生矿物的结晶度都不高;随着葡聚糖浓度的提高,次生矿物的颗粒尺寸降低,比表面积增加。因此,葡聚糖能够抑制次生矿物的合成,并且阻止次生矿物由施氏矿物向黄钾铁矾的转变。
H2O2 oxidation of Fe2 + and supply of four different concentrations of dextran method to explore the H2O2 oxidation system of dextran on the formation of secondary iron minerals. The results showed that dextran significantly inhibited the formation of secondary minerals. With the increase of dextran concentration, the content of Fe in secondary minerals decreased while the content of S did not change significantly, and the K content of all treatments Lower. The characteristic XRD peak of secondary minerals without dextran agrees well with that of jarosite, while the characteristic peaks of the secondary minerals formed by adding dextran coincide with the Shihsite minerals, but all of the secondary minerals treated The crystallinity is not high; with the increase of dextran concentration, the particle size of the secondary minerals decreases, the specific surface area increases. Therefore, dextran is able to inhibit the synthesis of secondary minerals and prevent the transformation of secondary minerals from jarosite to jarosite.