Determination of pore structures and adsorption properties of activated iron sulfide ores
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ISMSSE 2018
Determination of pore structures and adsorption properties of activated iron sulfide ores Fuqiang Yang 1 & Yilun Cai 1 & Xianyu Huang 1 Received: 6 March 2019 / Accepted: 18 October 2019 # Saudi Society for Geosciences 2019
Abstract To better reveal the pore structures and adsorption characteristics of iron sulfide ores after the mechanical activation, the raw sulfur-rich ore obtained from a sulfide mine was activated into several samples under different billing conditions. Both the scanning electron microscopy (SEM) and low-temperature N2 gas adsorption/desorption (LT-N2GA) methods were used to understand the features of the pore structures, such as the pore volume, specific surface area (SSA), and pore size distribution (PSD). Moreover, the Frenkel-Halsey-Hill (FHH) model was applied to determine corresponding fractal dimensions. The research results indicate that the N2 adsorption of the activated samples mostly takes place in the mesopores ranging from 2 to 30 nm. The change order of the SSA and pore volume for the activated samples with different sample-ball ratios is as follows: a (1:2)< b (1:4)< c (1:6); and that with diverse milling rates is as follows: d (200 r/min)< e (400 r/min)< f (600 r/min). The transformations in the fractal dimensions agree with those in SSA and pore volume development, while the alterations are on the contrary in average pore diameter. The mechanical activation can increase the fractal dimensions of iron sulfide samples and alters their oxygen adsorption properties, so it promotes the tendency of iron sulfide ores to oxidation and spontaneous combustion. Keywords Iron sulfide ores . Spontaneous combustion . Mechanical activation . Low temperature nitrogen adsorption . Fractal dimension
Introduction The loose sulfide deposit and blasting stockpile of sulfide ores are heterogeneous materials composed of fractures and pores. When exposed in the air, they will continuously adsorb oxygen molecules and generate a lot of heat, thus resulting in oxidation and spontaneous combustion under certain environmental conditions (Yang and Wu 2013, 2014). It is obvious that different oxygen adsorption capacity and oxygen release features are related to diverse PSD of iron sulfide ores. Therefore, pore morphology is one of the most important factors that determine the occurrence of oxidation and This article is part of the Topical Collection on Mine Safety Science and Engineering * Fuqiang Yang [email protected] 1
College of Environment and Resources, Fuzhou University, Fuzhou 350116, Fujian, China
spontaneous combustion of sulfide ores. Accordingly, there are different experimental methods for characterizing the pore morphology of porous medium, including nuclear magnetic resonance (NMR) (Li et al. 2018), small-angle X-ray scattering method (SAXS) (Zhao et al. 2014), high-resolution transmission electron microscope (HRTEM) (Zhai et al. 2012), and LT-N2GA method (Qi et al. 2017). Moreover, the LT-N2GA analysis is regarded as an efficient means that is applied widely. For example, co
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