Experimental study on acidification effect of tailing sand

Sulfide minerals (mainly FeS2) contained in lead-zinc tailings are easy to be acidified in the air. The acidification mechanism is that the tailing sand generates sulfuric acid and sulfate under the catalysis of oxidant, water and oxygen. The acidic liquid generated by the reaction will continue to...

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Bibliographic Details
Published inE3S Web of Conferences Vol. 248; p. 1048
Main Authors Chen, Wenzhao, Yang, Kai, Fan, Jiaqing, Liu, Xiqi, Wei, Xiaoqing
Format Journal Article Conference Proceeding
LanguageEnglish
Published Les Ulis EDP Sciences 01.01.2021
Subjects
Acidic oxides
Acidification
Catalysis
Chemical properties
Dam safety
Friction
Internal friction
Iron sulfides
Lead
Metal oxides
Mine tailings
Minerals
Occlusion
Oxidants
Oxidizing agents
Physical properties
Pyrite
Sand
Sulfuric acid
Tailings
Zinc
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Summary:Sulfide minerals (mainly FeS2) contained in lead-zinc tailings are easy to be acidified in the air. The acidification mechanism is that the tailing sand generates sulfuric acid and sulfate under the catalysis of oxidant, water and oxygen. The acidic liquid generated by the reaction will continue to react with metal oxides to form an insoluble precipitate.In order to reveal the corresponding changes of chemical properties and physical properties of lead-zinc tailing sand during acidification, a series of reaction processes of tailings under natural conditions were simulated by immersion test in laboratory.It is found through the test that with the deepening of acidification, the coarse particles of tailing sand dissolve, resulting in the decrease of iron concentration in the compound, the increase of fine particles, the increase of specific surface area, the decrease of surface friction and occlusion friction between particles, resulting in the decrease of internal friction angle, and the decrease of the safety of tailings dam. words.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/202124801048