Enze Li

Effect of Oxygen Functional Groups on the Surface Properties and Flotation Response of Fine Coal, Comparison of Rank with Oxidation

The surface properties and flotation response of coal samples of different rank correspond to results from similar experiments for coal samples with different degrees of oxidation. Three principal ...

Preparation of a PASi-P(AM-ADB) hybrid flocculant and efficiently removal bio-refractory organics from coking wastewater

Bio-refractory organic contaminants (BOC) originating from coking wastewater is a severe threat to the environment and human health. The efficient pretreatment of coking wastewater is necessary to decrease the stress of the biological treatment stage. For pretreatment, the development of effective flocculants is needed. In this work, a novel inorganic–organic hybrid flocculant, polyaluminum silicate chloride–polyacrylamide–acryloyloxyethyl dimethylbenzyl ammonium chloride (PASi-P(AM-ADB)), was prepared and its flocculation behavior for raw coking wastewater were investigated. Flocculation results showed that this hybrid flocculant exhibited significantly higher removal efficiency than two other common flocculants, polyaluminum chloride and cationic polyacrylamide. Gratifyingly, the PASi-P(AM-ADB) can also efficiently remove refractory organic contaminants during the process of flocculation, as demonstrated by gas chromatography–mass spectrometry (GC–MS). Particularly, several polycyclic aromatic hydrocarbons, defined as persistent organic pollutants, are removed completely. Here, we demonstrated that this new hybrid flocculant presented outstanding flocculation properties as well as high-efficient removal of some special BOC from raw coking wastewater. This work might provide new insights into the design of functional inorganic–organic hybrid flocculants and enhance the treatment of complex industrial wastewater.

Removal of Insoluble Slimes from Potash Ore Using Flotation

Abstract The low grade potash ores contain large amount of fine water insoluble minerals, which was defined as slime here. The removal of the slime from the low grade of potash ores (KCl < 10 %; slime > 40 %) from the Mahai Basin, Qinghai Province, PRC, was investigated using flotation. The characteristics of the slime sample, which was extracted from the potash ores sample, were examined by X-Ray Fluorescence Spectrometry and X-Ray Diffraction. It was found that more than 70 % of the slime was aluminum silicate minerals including feldspar, clay (phyllosilicates), silt, as well as gypsum and carbonate minerals. In this study the flotation response of the slime minerals was evaluated. It was found that a higher slime flotation recovery of the slime was obtained when the MR-1 surfactant (polyoxyethylene fatty acid ester)-kerosene-water emulsion was used as collector. Fourier Transform Infrared Spectrometry (FTIR Spectrometry), oil spreading, and contact angle results indicated that the MR-1 surfactant is selectively adsorbed on slime minerals surfaces and facilitates the spreading of kerosene.