Effects of ammonium phosphate on the formation of crystal copper sulfide on chrysocolla surfaces and its response to flotation

被引:30
作者
Shen, Peilun [1 ,2 ]
Liu, Dianwen [1 ,2 ]
Xu, Xiaohui [3 ]
Jia, Xiaodong [1 ,2 ]
Zhang, Xiaolin [1 ,2 ]
Song, Kaiwei [1 ,2 ]
Cai, Jinpeng [1 ,2 ]
机构
[1] Kunming Univ Sci & Technol, Fac Land Resource Engn, State Key Lab Complex Nonferrous Met Resources Cl, Kunming 650093, Yunnan, Peoples R China
[2] State Key Lab Mineral Proc, Beijing 100160, Peoples R China
[3] North China Univ Sci & Technol, Grad Sch, Tangshan 063210, Hebei, Peoples R China
基金
中国国家自然科学基金;
关键词
Chrysocolla; Sulfidization flotation; Ammonium phosphate; Crystalline; Copper sulfide film; RAY PHOTOELECTRON-SPECTROSCOPY; SULFIDIZATION FLOTATION; XPS; MINERALS; BEHAVIOR; FILMS;
D O I
10.1016/j.mineng.2020.106300
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
In this study, for the first time, we applied ammonium phosphate to pre-treat chrysocolla prior to sulfidization flotation. In addition, we investigated the structural characteristics of the copper sulfide film formed on the chrysocolla surfaces and its response to flotation. Micro-flotation experiments revealed that the addition of (NH4)(3)PO4 prior to sulfidization greatly improves the floatability of chrysocolla and its recovery increased from 8.71% to 87.97% with butyl xanthate as the collector. The results of the field emission scanning electron microscopy analysis showed that numerous regular fragments appeared on the chrysocolla surfaces after the addition of (NH4)(3)PO4. The X-ray diffraction and X-ray photoelectron spectrometry analysis confirmed that these fragments were newly formed copper sulfide covering the chrysocolla surfaces, during this process a chemical reaction occurred in the slurry system, i.e. the Cu2+ were reduced to Cu+, the S2- were mainly oxidized to S-, (S-2(-)), (S-2)(2-). The copper sulfide species primarily in the form of crystalline covellite (Cu-3(+)(S-2)S-2-(-)), which is the key to obtaining good flotation recovery. As a specific activator, (NH4)(3)PO4 participates in the liquid-solid phase chemical reaction between the sulfidizing reagent and the chrysocolla, which promotes the sulfidization reaction of chrysocolla.
引用
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页数:12
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