Chemical oxidation co-coagulation-flocculation for the flotation wastewater treatment of lead-zinc oxide ore from Lanping mine

IF 1.5 4区工程技术 Q2 Earth and Planetary Sciences

Physicochemical Problems of Mineral Processing Pub Date : 2024-06-09 DOI:10.37190/ppmp/189756

Xiang Gong, Xiulan Guo, Suqi Li, Jiaqiao Yuan, Z. Ding, Anmei Yu, Shuming Wen, Shaojun Bai

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Abstract

The flotation wastewater produced by "lead preferred flotation-zinc flotation" all-open process with aids of mixed depressants and cationic-anionic collectors has a high turbidity and multitude of reagent contaminants, and fails to meet the discharge standards. This study objective is to remove fine solid particles and flotation reagents in this wastewater by chemical oxidation co-coagulation-flocculation process. Results of chemical oxidation tests indicate peroxymonosulfate (PMS) exhibits superior performance on decreasing COD, and the COD remarkably decreases to 71.8 mg·L-1 with 100 mg·L-1 PMS addition after 120 min. Moreover, the combined oxidation of radicals (SO4•- and •OH) are responsible for degradation of flotation reagents (Na2S, DCCH, xanthates and amine) in the wastewater. Results of experimental factors confirm that the turbidity of wastewater decreases significantly from 124796 to 71.4 NTU, and the yield of water reaches above 90% with combined usage of lime (500 mg·L-1) and polyacrylamide (PAM, 50 mg·L-1). Besides, the contents of S, P, N, Zn Pb and Fe decrease, and meet the discharge standards. Results of zeta potential analysis suggest lime reduces the electrostatic repulsion between particles, and PAM plays a bridge link role between particles, accelerating the precipitation of suspended particle.

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化学氧化共混-絮凝法处理兰坪铅锌矿浮选废水

采用混合抑制剂和阳离子-阴离子捕收剂辅助的 "铅优先浮选-锌浮选 "全开式工艺产生的浮选废水浊度高、试剂污染物多，不能达标排放。本研究的目的是通过化学氧化混凝絮凝工艺去除废水中的细小固体颗粒和浮选试剂。化学氧化试验结果表明，过氧化单硫酸盐（PMS）在降低 COD 方面表现出色，在加入 100 mg-L-1 PMS 的情况下，120 分钟后 COD 显著降至 71.8 mg-L-1。此外，自由基（SO4--和 -OH）的联合氧化作用也是废水中浮选试剂（Na2S、DCCH、黄原酸盐和胺）降解的原因。实验结果表明，联合使用石灰（500 mg-L-1）和聚丙烯酰胺（PAM，50 mg-L-1），废水浊度从 124796 NTU 显著下降到 71.4 NTU，产水率达到 90% 以上。此外，S、P、N、Zn Pb 和 Fe 的含量也有所下降，达到了排放标准。zeta 电位分析结果表明，石灰降低了颗粒之间的静电排斥力，而聚丙烯酰胺在颗粒之间起到了桥梁纽带的作用，加速了悬浮颗粒的沉淀。

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来源期刊

Physicochemical Problems of Mineral Processing 工程技术-矿业与矿物加工

CiteScore

2.20

自引率

6.70%

发文量

审稿时长

3.3 months

期刊介绍： Physicochemical Problems of Mineral Processing is an international, open access journal which covers theoretical approaches and their practical applications in all aspects of mineral processing and extractive metallurgy. Criteria for publication in the Physicochemical Problems of Mineral Processing journal are novelty, quality and current interest. Manuscripts which only make routine use of minor extensions to well established methodologies are not appropriate for the journal. Topics of interest Analytical techniques and applied mineralogy Computer applications Comminution, classification and sorting Froth flotation Solid-liquid separation Gravity concentration Magnetic and electric separation Hydro and biohydrometallurgy Extractive metallurgy Recycling and mineral wastes Environmental aspects of mineral processing and other mineral processing related subjects.