Adsorption behaviors and mechanisms of quaternary ammonium salt collectors on quartz samples with different particle sizes

Silicate minerals with a certain degree of flotability are often easy to mix into sulfide ore concentrate in mineral processing industry. In this paper, the adsorption of yeast dextran on clinochlore and its application in pyrite/clinochlore separation were investigated. The adsorbed amount and micro polarity measurement results displayed that the yeast dextran molecules selectively adsorbed onto clinochlore surface compared with pyrite. The adsorbed yeast dextran resulted in the increase in the surface polarity of clinochlore surface, and inhibited the further adsorption of xanthate, thus keep it hydrophilic and depressed. Quantum chemical computation results indicated that yeast dextran was mainly adsorbed on mineral surface by the chelation with the surface metal active sites, and the chelating strength of yeast dextran with three ions was in the sequence of Fe 3+ > Mg 2+ > Fe 2+ . While Mg 2+ , Fe 2+ and Fe 3+ are the main metal ions on the surface of clinochlore, and Fe 2+ is the unique metal ions on pyrite surface. This is the reason of the selectivity of the yeast dextran depressant for pyrite/clinochlore flotation system. The flotation results demonstrated that yeast dextran was qualified to selectively depress clinochlore in pyrite flotation.

Section: Micropolarity Detectionmentioning

confidence: 99%

Adsorption of yeast dextran on clinochlore surface and the implications for pyrite/clinochlore separation

Wang¹,

Zhang²,

Zhao³

et al. 2022

“…The surface of calcium sulphate dihydrate was negatively charged in wide pH range, and cationic collector has a good ability to collect it (Lu et al, 2008;Raii et al, 2014). Quaternary ammonium salts are a common cation collectors used in the flotation of various negatively charged minerals (Hu et al, 2012;Wang and Ren, 2005;Jiang et al, 2019) . DTAC is one of the most representative quaternary ammonium salt collector (Tian et al, 2017;Rahimi et al, 2017).…”

Section: Collector Dosage Testmentioning

confidence: 99%

A novel method for purification of phosphogypsum

Wang¹,

Dong²,

Wang³

et al. 2020

Phosphogypsum is an industrial solid waste from the phosphate fertilizer industry. At present, the accumulation of phosphogypsum has caused very serious economic and environmental problems. A large scale of phosphogypsum is consunmed in the building field. The characteristics of whiteness and phosphorus content are important factors affecting the use of phosphogypsum as a building material. In this study, soluble phosphorus and fluorine were removed by adding lime, and flotation was employed to purify phosphogypsum. A large amount of organic matter and fine slime in the phosphogypsum were removed by reverse flotation, and gypsum was floated by positive flotation. Through the flotation closed-circuit experiment, the whiteness of phosphogypsum was increased from 31.5 to 58.4, the percentage of total phosphorus in gypsum (P2O5) was reduced from 1.78 to 0.89, the grade of calcium sulphate dihydrate was 96.6%, the recovery of concentrate was 74.1%. After removing impurities, the phosphogypsum concentrate reached the first grade national standard of the phosphogypsum building materials in China. The method is cheap and practical, and can be used as an important method for pretreatment of phosphogypsum.

“…Also, flotation can remove the secondary pig iron which is mixed by crushing and grinding (Liu, 1993;Li and Xu, 1995). The results of a series of microflotation experiments showed that the longer the QAS carbon chain, the stronger the collection capacity on quartz (Jiang et al, 2019). Besides, silicate bacteria were used to pretreat quartz for 3 days based on the metabolites of microorganisms, organic acids and polysaccharides dissolve quartz.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of removing impurity from a quartz ore by microbial flotation-acid leaching

Zhu¹,

Dai²,

Li³

et al. 2020

The purity of a quartz ore is relatively low at a SiO2 content of 97.18%, and the main impurity in the ore is Fe, Al, and Ca bearing minerals. The main component in an industrial waste bacteria (WJ) is polysaccharides, which may be used as depressors for inhibiting iron minerals in quartz flotation. Moreover, WJ belongs to microbial inhibitors because it is mainly composed of bacteria. As a result of this study, a concentrate grade of 99.88% at recovery over 80% was obtained under the condition of 2000 g/Mg WJ dosage, a grinding fineness of 70%-0.074 mm, pH 11.7, 400 g/Mg CaCl2, and 800 g/Mg NaOL in the flotation experiments for the quartz ore. Moreover, a SiO2 grade of 99.97% at a recovery of 68.85% was obtained at an acid dosage of 40 kg/Mg by using mixed acid of H2SO4, HCl, HNO3, and HF in mass ratios of 20%, 30%, 20%, and 30%, respectively, in subsequent acid leaching of the quartz flotation concentrate. Zeta potential analysis before and after the interaction of quartz and hematite with WJ showed that WJ increased the zeta potential of hematite significantly but had little impact on the zeta potential of quartz, indicating stronger adsorption of WJ on hematite than on quartz. FTIR analysis showed that there exist not only-COOH,-CH2-, and-CH3, which are the functional groups of starch but also NH2 and-C=O-NH-in WJ. The NH2 and-C=O-NH-in WJ are the important groups for adsorption, so the depressing effect on hematite was better for WJ than starch.