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- Title
Research on the Influence of Reuse of Weathered Tungsten Wastewater on Flotation.
- Authors
LU Hongyu; LIU Runqing; ZHU Yangge; WU Meirong
- Abstract
Tungsten minerals are brittle and easy to silt, and the fine mud is easy to remain in the beneficiation wastewater, resulting in a high content of suspended solids (SS) in the wastewater. The direct discharge of SS poses a serious threat to the environment, and reuse will affect the beneficiation index. The influence and mechanism of the recycling of weathered tungsten ore beneficiation wastewater on the flotation of tungsten ore were studied, and theoretical basis for the appropriate treatment and reuse of the beneficiation wastewater has been provi. The simulated wastewater test shows that the content of SS has great influence on the tungsten rougher flotation index, which needs to be further reduced. The effect of SS on the flotation mechanism of tungsten ore shows that the SS has a loose irregular flake shape and a non- smooth surface. The surface has adsorbed the flotation reagents sodium oleate and sodium silicate. SS is negatively charged on the surface over a wide pH range and produces competitive adsorption with negatively charged flotation agents. Using " 2 g/L calcium chloride + 0.5 g/L polymeric ferric sulfate" to treat wastewater, the SS content was reduced from 25 160 mg/L to 16 mg/L, the removal rate reached 99.94 %, and the Si content was reduced from 216.9 mg/L to 33.26 mg/L, Si removal rate is 84.67%, particle chemical oxygen demand is reduced from 312.49 mg/L to 6.86 mg/L, and the removal rate reaches 97.80%. Combined with the chemical analysis of the solution, the mechanism of "calcium chloride+ polymeric ferric sulfate" to remove SS was found to reduce the colloidal potential by electrically neutralizing and compressing the electric double layer, thereby promoting the rapid aggregation and precipitation of fine particles. The treated wastewater is reused in the original flotation process, and the treated wastewater is similar to clean water.
- Publication
Nonferrous Metals (Mineral Processing Section), 2021, Issue 6, p151
- ISSN
1671-9492
- Publication type
Article
- DOI
10.3969/j.issn.1671-9492.2021.06.020