Preparation of polysilicate aluminum iron from iron tailings and its treatment of wastewater

doi:10.19965/j.cnki.iwt.2024-0211

Abstract

Abstract:

Iron tailings were used as raw materials to prepare poly aluminum ferric silicate(PSAF). The effects of the molar ratio of Al-Fe-Si, curing temperature and curing time on the flocculating properties of PSAF were studied respectively to determine the best conditions for the preparation of flocculant. Finally, the prepared flocculant was used for the treatment of leather wastewater to explore the best conditions for the treatment of leather wastewater with PSAF flocculant. The results showed that, n(Al)∶n(Fe)=5∶1, n(Al+Fe)∶n(Si)=10∶1, the curing temperature was 40 ℃ and the curing time was 3 h, the properties of the poly aluminum ferric silicate flocculant were the best. When the dosage of PSAF flocculant was 250 mg/L, the pH of wastewater was close to 8, and the stirring time was 8 min,the removal rates of COD, SS, turbidity and total nitrogen in leather wastewater were 83.2%, 93.17%, 94.83% and 51.78%, respectively.

Key words: iron tailings, poly aluminum ferric silicate, leather wastewater

摘要：

以铁尾矿为原料制备聚硅酸铝铁（PSAF），分别研究铝铁硅物质的量比、熟化温度、熟化时间对絮凝剂絮凝效果的影响，从而确定PSAF制备的最佳条件，最后将制备的PSAF用于皮革废水的处理，探究PSAF处理皮革废水的最佳条件。结果表明，当n（Al）∶n（Fe）=5∶1，n（Al+Fe）∶n（Si）=10∶1，熟化温度为40 ℃，熟化时间为3 h时，制备的PSAF絮凝效果最佳。当PSAF投加量为250 mg/L，废水pH接近8，搅拌时间为8 min时，对皮革废水中COD、SS、浊度和总氮的去除率最大，分别为83.2%、93.17%、94.83%和51.78%。

关键词: 铁尾矿, 聚硅酸铝铁, 皮革废水

CLC Number:

X703.1

Tingyun YANG, Cuicui GAO, Daohan WANG, Duanping XU. Preparation of polysilicate aluminum iron from iron tailings and its treatment of wastewater[J]. Industrial Water Treatment, 2025, 45(4): 72-77.

杨婷赟, 高翠翠, 王道涵, 许端平. 铁尾矿基聚硅酸铝铁制备及其对废水的处理[J]. 工业水处理, 2025, 45(4): 72-77.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-0211

https://www.iwt.cn/EN/Y2025/V45/I4/72

Figures/Tables 7

Table 1 The main components of iron tailings

成分	SiO₂	Al₂O₃	CaO	Fe₂O₃
质量分数/%	45.06	24.37	14.87	12.94

Fig.1 Element leaching process flow chart

Fig.2 Changes of aluminum-iron leaching rates of tailings under different activation conditions

Fig.3 Changes of polysilicic acid gelling time under different conditions

Fig.4 Treatment effects of flocculants prepared under different parameters on leather wastewater

Fig.5 Treatment effect of PSAF on leather wastewater under different conditions

Fig.6 SEM pictures of iron tailings raw materials and iron tailings based PSAF

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