Ammonium chloride’s weakening effect on the copper activation of pyrite in flotation and the surface regulation mechanism behind it

• Autorzy: Zhang Shengdong , Chen Yumeng , Tong Xiong , Xie Xian , Lu Yalin

Identyfikatory

DOI

10.5277/ppmp19029

• Języki publikacji: EN

Abstrakty

EN

The traditional separation process of pyrite and marmatite is carried out under highly alkaline conditions. Therefore, a large amount of lime is demanded and the zinc recovery cannot be guaranteed. However, under weakly alkaline conditions, copper-activated pyrite has good floatability, which is difficult to separate from marmatite. In this paper, ammonium chloride (NH₄Cl) is used for depressing the flotation of copper-activated pyrite to achieve the separation of these two minerals under weakly alkaline environment. The flotation tests show that NH₄Cl can significantly reduce the floatability of pyrite in weakly alkaline conditions. The results of adsorption tests and X-ray photoelectron spectroscopy (XPS) analyses indicate that NH₄Cl can obviously change the composition of pyrite surface by increasing the content of iron/copper hydroxide and reducing the content of copper sulfides. Calculation of the solution composition demonstrates that the addition of NH₄Cl results in the occurrence of Cu(NH₃)n²⁺ and the pH buffering property. Based on these results, it can be concluded that the depression of NH₄Cl on copper activated pyrite is mainly derived from two aspects: 1) the pH buffering property of the conjugated acid-base pair (NH₄₊/NH₃) can impede the decline of OH- concentration, which results in more hydroxide adsorbed on pyrite; 2) NH₃ (aq) competes with the pyrite surface to consume Cu²⁺through complexation, which causes a reduction in the amount of copper sulfides formed on the pyrite surface.

Słowa kluczowe

EN

pyrite; depression; cuprammonium solution; pH buffering property; flotation

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2019
• Tom: Vol. 55, iss. 5
• Strony: 1070--1081
• Opis fizyczny: Bibliogr. 31 poz., rys., tab., wykr., wz.

Twórcy

autor

Zhang Shengdong

• Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China

autor

Chen Yumeng

• Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China

autor

Tong Xiong

• Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China

autor

Xie Xian

• Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China

autor

Lu Yalin

• Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).