Preparation and removal effect of ballasted material for synergistic turbidity and fluoride removal from coal mine water

doi:10.19965/j.cnki.iwt.2022-0956

Abstract

Abstract:

The overall utilization rate of mine water in China is low. In recent years，the mine water discharged from coal mines presents new characteristics such as large changes in water quality and quantity，and multi-pollutant compound pollution. In this study，a new type of ballasted material was prepared by using stripped limestone from coal mine open-pit mining as raw material to treat mine water. Through the gradient setting of reaction conditions，the removal effect of turbidity and fluoride ions was studied，and the change of material characteristics before and after treatment was analyzed. The research results showed that the turbidity and fluoride ion removal efficiency of ballasted flocculation were better than traditional coagulation technology. Under the optimal conditions that the dosage of PAC was 60 mg/L，the dosage of PAM was 1.2 mg/L，and the dosage of new ballasted material was 2.0 g/L，the turbidity removal rate could reach 92.7%，and the fluoride ion removal rate could reach 96.35%. The continuous running results showed that the turbidity of the outlet was below 0.8 NTU，and the fluoride ion concentration of the outlet could be controlled within 0.7-1.0 mg/L. The results of SEM，XRD and FTIR showed that the main component of the new ballasted material was hydroxyapatite，and the related mechanisms mainly include surface flocculation and adsorption. After the reaction，a large amount of suspended solids was adsorbed on the surface of the new ballasted material，and the main product produced by the ion exchange reaction was Ca₅（PO₄）₃F.

Key words: suspended solids, ballasted flocculation, fluoride ion, hydroxyapatite, coal mine water

摘要：

我国煤矿矿井水整体利用率较低，近年来煤矿外排矿井水呈现水质水量变化大、多污染物复合污染等新特征。采用煤矿露天开采剥离的石灰岩为原料，制备一种新型加载材料处理矿井水，通过反应条件梯度设置，研究对浊度和氟离子的去除效果，分析处理前后材料的特征变化。研究结果表明，加载絮凝的浊度、氟离子去除效果均优于传统混凝技术，在聚合氯化铝（PAC）投加量为60 mg/L，聚丙烯酰胺（PAM）投加量为1.2 mg/L，新型加载材料投加量为2.0 g/L的最优条件下，浊度去除率可达92.7%，氟离子去除率可达96.35%。连续运行结果表明，出水浊度在0.8 NTU以下，出水氟离子质量浓度可控制在0.7~1.0 mg/L。扫描电镜、X射线衍射和傅里叶红外光谱的表征结果表明，制备的新型加载材料主要成分为羟基磷灰石，涉及机理主要包括表面絮凝和吸附。反应结束后，新型加载材料表面吸附大量悬浮物，通过离子交换反应生成的主要产物为Ca₅（PO₄）₃F。

关键词: 悬浮物, 加载絮凝, 氟离子, 羟基磷灰石, 矿井水

CLC Number:

X752
X703.1

Ming WEI, Xiaohui NIU, Yanping LIU, Tingchao YANG, Xiaohang ZHANG, Shipeng YANG. Preparation and removal effect of ballasted material for synergistic turbidity and fluoride removal from coal mine water[J]. Industrial Water Treatment, 2023, 43(9): 84-90.

卫明, 牛晓惠, 刘艳萍, 杨廷超, 张晓航, 杨世鹏. 新型除浊除氟加载材料的制备及其处理矿井水效果[J]. 工业水处理, 2023, 43(9): 84-90.

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URL: https://gyscl.magtechjournal.com/EN/10.19965/j.cnki.iwt.2022-0956

https://gyscl.magtechjournal.com/EN/Y2023/V43/I9/84

Figures/Tables 9

Table 1 The component contents of limestone sample

项目	CaO	SiO₂	MgO	Fe₂O₃	Al₂O₃	MnO	TiO₂	K₂O	Na₂O	SrO
质量分数/%	55.48	0.68	0.45	0.09	0.24	0.005	0.015	0.14	0.008	0.02

Fig. 1 The cooperative removal apparatus for suspended solids and fluoride in coal mine water

Fig.2 The SEM，XRD，FT-IR of new ballasted material

Fig. 3 The effect of coagulant dosage on removal of turbidity and fluoride pollutant

Fig. 4 The effect of flocculant dosage on removal of turbidity and fluorine pollutant

Fig. 5 The effect of the dosage of new ballasted material on removal of turbidity and fluorine pollutant

Fig. 6 The SEM of sediment

Fig.7 The XRD，FT-IR of new ballasted material before and after adsorption

Fig. 8 The dynamic experiment of combined removal of suspended solids and fluoride

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