Effects of silicate-bacteria pretreatment on desiliconization of magnesite by reverse flotation

Bacillus cereus bacteria and their by-products were used as surface-active agents for surface hydrophobicity of the apatite in the flotation process leading to phosphate ores' enrichment. Recently, proteomics is used to investigate the biochemical processes through discovering new proteins or investigating protein-protein interactions. In this work, we investigated the physicochemical behavior of pure apatite and quartz minerals in the presence of Bacillus cereus using zeta-potential, FTIR, and hydrophobicity measurements. Our results indicated that isoelectric point (IEP) occurred at pH 4.7 for apatite and 2.1 for quartz mineral. Bacillus cereus treatment decreased IEP of apatite to 1.8; while there was no significant change in IEP value of quartz. We used comprehensive proteomic profile analysis of Bacillus cereus in the presence of apatite mineral to identify the biological mechanism and molecules involved in such enrichment capacity. Our data identified the up-regulated Surface Layer (S-Layer) protein in this bacterial strain to be associated with the best mineral yield.

Section: Fig 4 Effect Of Ph On the Floatability Of Quartz And Apatitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Proteomic profile to explain the mechanism of the Bacillus cereus-phosphate mineral interaction

El-Ghammaz¹,

Hassan²,

Abdel-Khalek³

2021

“…Aslani et al have researched that reverseflotation was carried out on Iranian magnesite (Aslani et al, 2010). At present, the research on low-grade magnesite in China mainly mainly focuses on flotation (Yao et al, 2016;Teng, 2018;Ji, 2009;.…”

Section: Introductionmentioning

confidence: 99%

Research on the mechanism of a mixed collector onto magnesite surface to improve the flotation separation of magnesite from hornblende

Wang¹,

Li²,

Dai³

et al. 2021

Low-grade magnesite is not effectively used mainly due to high silicon content, especially the separation of magnesite and hornblende. In this research, a novel mixture of sodium oleate and dodecyl phosphate collector was used to increase the flotation difference between magnesite and hornblende. Artificially mixed mineral concentrates grade 47.10% (MgO content) concentrate recovery of 84.45% was obtained by micro flotation test, the results showed that the mixed collector of sodium oleate and dodecyl phosphate played a better selective promotion role in the flotation of magnesite. The interaction mechanism of this mixed collector with hornblende and magnesite surfaces was investigated using Fourier transform infrared spectroscopy (FTIR), zeta potential, and X-ray photoelectron spectroscopy (XPS), which showed that the mixed collector in terms of magnesium selection was mainly adsorbed on these magnesium sites of magnesite, and the surface of magnesite thus became hydrophobic, allowing magnesite to float and separate from hornblende.

“…Today, with the increase in demand and the lack of rich ore, the exploitation of middle and low grade ore has attracted a lot of attention, among which about 40% of common minerals are silicate minerals (Tian, et al 2019). Quartz is the main gangue of siliceous and silicate minerals, many studies have confirmed that reverse flotation of the gangue mineral quartz is the most widely used method for the separation of these minerals (Cao, et al 2013;Huang, et al 2020;Li, et al 2017a;Liu, et al 2019;Teng, et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Study on the foam behavior of amine reagents adsorbed at gas-liquid and gas-liquid-solid interfaces

He¹,

shang²,

Xie³

et al. 2020

Alkyl amines are widely used as cationic collectors in flotation. In this work, the flotation foaming behaviors of alkyl amines, including dodecylamine (DDA), din -hexylamine (DHA), octadecylamine (ODA), oleylamine (OLA), in the presence or absence of quartz were investigated by a new approach, "foam analyzer". The effects of pH, reagent dosage, concentration of quartz powder, and particle size on foaming property and stability of bubble were explored, and the physical model of foam structure evolution was established. The adsorption mechanism of amines on quartz surface was studied from molecular structure, surface tension, zeta potential, charging mode, and adsorption form. The results show the foam stability of four amine collectors as follows: OLA > ODA > DHA > DDA. In the range of pH=6-10, the foam properties of the four amines are better. Under the same conditions, the longer carbon chain of aliphatic amine, the more unsaturated bonds, the fewer hydrogen atoms of the amine group, and the corresponding foam properties are better. When the concentration of quartz powder is 8-10%, the foaming and stability of the foam of four kinds amines are the best, The finer quartz powder particle size, the more stable the amine foam and the stronger the foamability.