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Application of dodecyl amine/dodium petroleum sulfonate mixed collector in quartz-feldspar flotation separation

He Yuhao, Ren Zijie, Zhu Huimin, Zheng Renjun, Li Mingyang, Song Yuhan, Chen Zhijie

Physicochemical Problems of Mineral Processing

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2024

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Vol. 60, iss. 1

art. no. 185553

EN

It’s highly challenging to separate feldspar from quartz by flotation owing to their similar crystal structure and physicochemical properties. Using mixed collectors has become a promising method to improve the quartz-feldspar separation. In this study, mixed dodecyl amine (DDA) and sodium petroleum sulfonate (SPS) surfactants were used in the flotation separation of feldspar and quartz, and the adsorption mechanism of mixed collectors and depression mechanisms of two depressants were investigated through zeta potential, contact angle and Fourier transform infrared (FT-IR) spectra. When the pH reached 4.5, the separation of feldspar from quartz was more obvious. In the presence of DDA/SPS collector, the contact angle of feldspar was increased more obviously leading to enhance hydrophobicity. The infrared spectra revealed the interaction of collectors on feldspar surface involved physical and chemical adsorption, whereas the adsorption of collector on quartz was only physical interactions. The use of sodium hexametaphosphate resulted in a significantly enhanced separation performance. The weaker physical adsorption of mixed collector on quartz can be destroyed by sodium hexametaphosphate. This study is beneficial for understanding the collect mechanisms of mixed cationic-anionic surfactants on quartz and feldspar minerals, and promotes the development of advanced feldspar separation techniques.

2

Interaction of sulfuric acid with dolomite (104) surface and its impact on the adsorption of oleate anion: a DFT study

Cao Qinbo, Zou Heng, Chen Xiumin, Yu Xingcai

Physicochemical Problems of Mineral Processing

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2020

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Vol. 56, iss. 1

34--42

EN

Sulfuric acid (H2SO4) is a specific depressor for apatite rather than for dolomite. The H2SO4treated dolomite can still be floated effectively by oleate. However, the role of H2SO4 in the adsorption of oleate onto dolomite surface remains unclear. In this work, density functional theory calculations were conducted to probe the interactions among sulfate anion (SO42−), oleate anion and the dolomite surface. The adsorption behaviors of SO42− anion onto the perfect and CO3-defect dolomite surfaces were compared. Such results show that SO42−anion could only adsorb onto the defective dolomite surface, where it bonded with a Ca atom. The remaining Ca and Mg atoms at the defect site could further react with the oleate anion, generating new Ca/Mg–O ionic bond. In this regard, oleate and SO42−anions may both present on the dolomite surface. This phenomenon accounts for the flotation of H2SO4-treated dolomite.

3

Wpływ depresatora na mętnienie mieszaniny estrów metylowych olejów roślinnych i oleju napędowego

Batko B., Dobek T.

Inżynieria Rolnicza

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2007

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R. 11, nr 6 (94)

7-13

PL

W pracy przedstawiono wyniki badań laboratoryjnych nad efektywnością depresatora na obniżenie temperatury mętnienia paliwa skomponowanego z oleju napędowego i estrów metylowych wyższych kwasów tłuszczowych wytworzonych w warunkach przemysłowych, jak i przydomowych, metodami gospodarskimi. Badania wykazały zróżnicowane działanie oraz stosunkowo niską efektywność depresatora w estrach wytworzonych metodami gospodarskimi. Dodatek estrów do oleju napędowego znacząco wpływa na efektywność depresatora i na zmianę temperatury mętnienia nowopowstałej mieszaniny.

EN

The paper presents results of laboratory research for depressor effect on lowering the cloud temperature point of fuel composed of fuel oil and methyl esters of higher fatty acids produced by industrial processes as well as at the household, using economic methods. The described research showed varying action and relatively low effectiveness of the depressor in esters produced by using the household methods. Addition of esters to the fuel oil changes the depressor effectiveness and cloud point temperature of a new mixture in a meaningful way.